DOCSLIB.ORG

Mesozoic Stratigraphy of the Patagonia Mountains and Adjoining Areas, Santa Cruz County, Arizona

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Mesozoic Stratigraphy of the Patagonia Mountains and Adjoining Areas, Santa Cruz County, Arizona Mesozoic Stratigraphy of the Patagonia Mountains and Adjoining Areas, Santa Cruz County, Arizona GEOLOGICAL SURVEY PROFESSIONAL PAPER 658-E Mesozoic Stratigraphy of the Patagonia Mountains and Adjoining Areas, Santa Cruz County, Arizona By FRANK S. SIMONS MESOZOIC STRATIGRAPHY IN SOUTHEASTERN ARIZONA GEOLOGICAL SURVEY PROFESSIONAL PAPER 658-E Descriptive stratigraphy of Triassic, Jurassic, and Cretaceous rocks that are mainly rhyolites but that include some sedimentary rocks and intermediate volcanic rocks UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1972 UNITED STATES DEPARTMENT OF THE INTERIOR ROGERS G. B. MORTON, Secretary GEOLOGICAL SURVEY W. A. Radlinski, Acting Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price 40 cents (paper cover) Stock Number 2401-1205 CONTENTS Page Page Abstract El Cretaceous rocks . E13 Introduction 1 Bisbee Formation . .. 13 Triassic and Jurassic rocks... ... ... ... 2 Fossils and age. _....... 16 Canelo Hills Volcanics. ... ... 2 Volcanic rocks of lower Alum Gulch 16 Triassic or Jurassic rocks ._- . 3 Volcanic rocks of Dove Canyon.. 17 Volcanic rocks in the southern Patagonia Trachyandesite of Meadow Valley 18 Mountains ... __ __ . .... 3 Tuff and shale.... ... ..... 18 UX Ranch block . 3 Thin lava flows 19 Duquesne block.........._ ..... .. ...... 3 Thick lava flows 20 Corral Canyon block..... _ . .. 6 Chemical composition 20 Volcaniclastic sequence . .._ . 6 Alteration of trachyandesitic lavas. ... 20 Volcanic sequence.. .._. 7 Age .. - - 21 American Mine block. .._ 8 Cretaceous or Tertiary rocks ... ......... 21 Thunder Mine block _ 9 Volcanic rocks of the Humboldt Chemical composition... ....... ....... 9 mine-Trench Camp area ... ... 21 Age and correlation.. 10 Volcanic rocks of Red Mountain 22 Volcanic and sedimentary rocks References cited.. -.. _ 23 in the Flux mine area..___....._..._ . 12 ILLUSTRATIONS Page FIGURE 1. Index map of part of southeastern Arizona . - ... E2 2. Generalized geologic map and sections of part of the Patagonia Mountains and Canelo Hills.. .... 4 3. Sketch of a partial section of volcanic and sedimentary rocks of the UX Ranch block north of the Kansas mine ... _.__ . -_ __ - -- - - -. - - --- - -- 6 4. Sketch of a partial section of sedimentary and epiclastic volcanic rocks in the lower part of the Bisbee Formation west of the UX Ranch. -__. .._. .. 14 5. Sketch of a geologic section of volcanic and sedimentary rocks of the trachyandesite of Meadow Valley along a gully northeast of the Little Outfit Ranch._ . ..._ 19 TABLES Page TABLE 1. Comparison of chemical analyses, norms, and semiquantitative spectrographic analyses of Mesozoic volcanic rocks, Patagonia Mountains, with those of associated igneous and Nockolds' average rocks._- Ell 2. Average chemical analyses of rhyelites and granites, Patagonia Mountains 12 3. Comparison of chemical analyses, norms, and semiquantitative spectrographic analyses of trachyandesite and rhyodacite of Meadow Valley with those of Nockolds' average rocks 21 III MESOZOIG STRATIGRAPHY IN SOUTHEASTERN ARIZONA MESOZOIG STRATIGRAPHY OF THE PATAGONIA MOUNTAINS AND ADJOINING AREAS, SANTA GRUZ COUNTY, ARIZONA By FRANK S. SIMONS ABSTRACT older volcanic rocks. The volcanic-sedimentary sequence south­ The Patagonia Mountains and Canelo Hills in the Lochiel west of the Canelo Hills is mainly epiclastic volcanic con­ and Nogales 15-minute quadrangles of southeastern Arizona glomerate of andesitic composition with some more-silicic consist in large part of volcanic and sedimentary rocks of tuff and tuffaceous sandstone; some of these rocks resemble Mesozoic age. These rocks are in fault contact with Pre- those underlying the trachyandesite farther north. cambrian plutonic igneous rocks and overlie or are faulted The youngest rocks, of Late Cretaceous or early Tertiary against Paleozoic sedimentary rocks ranging in age from age, are coarse silicic tuff, tuff breccia, and lava west of Cambrian to Permian. They have been intruded by granodi- Trench Camp, where they are at least 800 feet thick, and orite of early Tertiary age and are overlain by sedimentary massive silicic volcanic rocks of uncertain origin on Red and volcanic rocks of middle Tertiary to Holocene age. At Mountain, where the thickness is perhaps 1,500 feet. These least 75 percent of the Mesozoic stratigraphic column is vol­ canic, mostly silicic volcanics; the remainder is sedimentary rocks lie unconformably on rocks of Late Cretaceous and with some interbedded volcanic rocks. The entire section is of Triassic or Jurassic age. not exposed in any one area, and correlations between areas and structural blocks are uncertain. The aggregate total INTRODUCTION thickness is unknown but is at least 10,000 feet and probably is 14,000 to 15,000 feet. The Patagonia Mountains, a north-northwesterly Silicic volcanic rocks of probable Triassic or Jurassic age trending range lying east of Nogales and south of make up several structural blocks in the southern half of Patagonia in southeastern Arizona (fig. 1), consist the Patagonia Mountains. Correlation between blocks is in large part of Mesozoic volcanic and sedimentary uncertain, but the thickness of the volcanic sequence is esti­ mated to be at least 6,000 to 7,000 feet and probably is con­ rocks. This report describes these rocks, together siderably more. Rocks are mostly rhyolitic lava, welded tuff, with some of similar age in nearby parts of the and tuff interlayered with minor sandstone, conglomerate, Canelo Hills to the east and in the intervening area and less-silicic volcanic rocks. Most of the Canelo Hills con­ at the head of the San Rafael Valley. Figure 2 is a sist of rhyolitic lava and welded tuff very similar to those in the Patagonia Mountains; the lava is at least 1,000 feet generalized geologic map showing the distribution thick, and the overlying welded tuff is at least 6,000 feet thick. of these rocks, which range in age from Triassic Cretaceous rocks consist of several thousand feet of dom- to Late Cretaceous or early Tertiary. Plutonic igne­ inantly fine grained sedimentary rocks assigned to the Bisbee ous rocks of Mesozoic age are also widely represented Formation of Early Cretaceous age in the central Patagonia in the same region but are noted only briefly herein. Mountains; several thousand feet of dominantly trachy- andesitic lava in the northern Patagonia Mountains, upper The layered rocks comprise six cartographic units San Rafael Valley, and Canelo Hills; and at least 2,000 'feet of known or strongly inferred Mesozoic age and two of heterogeneous volcanic and sedimentary rocks on the units of uncertain but probable Late Cretaceous southwest flank of the Canelo Hills. The Bisbee Formation or early Tertiary age. Some pairs of units may be comprises mostly brown siltstone and mudstone with numer­ stratigraphic equivalents but either do not crop ous thin limestone beds and some sandstone, conglomerate, and tuffaceous rocks; it rests disconformably on Triassic or out in the same area or are separated by major Jurassic silicic volcanic rocks. The trachyandesite is perhaps faults and therefore are described separately. Only 3,000 feet thick in the Patagonia Mountains, where it lies partial sections are available for all but one unit, unconformably either on Triassic or Jurassic volcanic rocks and correlations are uncertain. The aggregate total or on about 1,500 feet of rhyolitic to latitic lava and tuff, thickness is unknown; in the Patagonia Mountains which in turn rest unconformably on the older volcanics. this thickness is at least 10,000 feet and probably In the Canelo Hills, where the trachyandesite is much thin­ ner, it is underlain conformably by 1,000 feet or more of is as much as 14,000 or 15,000 feet, and in the tuff, shale, and conglomerate, which are faulted against Canelo Hills it may be 10,000 feet or more. Volcanic El E2 MESOZOIC STRATIGRAPHY IN SOUTHEASTERN ARIZONA rocks of silicic to intermediate composition make A3-A9) ; hence, they will not be discussed here in up 75 percent or more of the Mesozoic stratigraphic detail. The formation is divided into three informal column; the remainder is sedimentary rocks and members: a lower, volcaniclastic and volcanic mem­ some interlayered volcanic beds. ber as much as 2,000 feet thick; a middle, rhyolite Fieldwork was done over a period of about 7 member at least 1,000 feet thick; and an upper, months during 1960-63 as part of the geologic map­ rhyolitic welded tuff member at least 6,000 feet ping of the Lochiel and Nogales 15-minute quad­ thick. It is assigned a Late Triassic and Early rangles. Office work included microscopic study of Jurassic age on the basis of field relations with about 275 thin sections and X-ray diffractometer paleontologically dated rocks of Permian age and analysis of 30 altered rocks. Chemical analyses were of Early Cretaceous age, and on the basis of radio- made by rapid rock analysis methods (Shapiro and metric ages of 173±7 m.y. (million years) deter­ Brannock, 1962) on 14 volcanic rocks and two gran­ mined by the potassium-argon method on biotite ites. Various sections of the report have been from the welded tuff member and 144±4 m.y. deter­ strengthened by discussions with my colleagues mined by the same method on biotite from the lower John R. Cooper, Harald Drewes, Philip T. Hayes, member. The lower member was correlated by Hayes and Robert B. Raup, all of whom were working (1970a, p. A8-A9) with the Gardner Canyon For­ concurrently in adjacent or nearby areas; none, mation of the Santa Rita Mountains (Drewes, 1968, however, should be held responsible for any con­ p. C7), for which a radiometric age of 190±20 m.y. clusions reached herein. (Triassic) was obtained by the lead-alpha method on zircon from a dacite. In the area under consid­ TRIASSIC AND JURASSIC ROCKS eration, the Canelo Hills Volcanics are in fault CANELO HILLS VOLCANICS contact with the trachyandesite of Meadow Valley The Canelo Hills Volcanics (fig.
Load more

Recommended publications
  • Schedule of Proposed Action (SOPA) 04/01/2021 to 06/30/2021 Coronado National Forest This Report Contains the Best Available Information at the Time of Publication
    Schedule of Proposed Action (SOPA) 04/01/2021 to 06/30/2021 Coronado National Forest This report contains the best available information at the time of publication. Questions may be directed to the Project Contact. Expected Project Name Project Purpose Planning Status Decision Implementation Project Contact Projects Occurring Nationwide Gypsy Moth Management in the - Vegetation management Completed Actual: 11/28/2012 01/2013 Susan Ellsworth United States: A Cooperative (other than forest products) 775-355-5313 Approach [email protected]. EIS us *UPDATED* Description: The USDA Forest Service and Animal and Plant Health Inspection Service are analyzing a range of strategies for controlling gypsy moth damage to forests and trees in the United States. Web Link: http://www.na.fs.fed.us/wv/eis/ Location: UNIT - All Districts-level Units. STATE - All States. COUNTY - All Counties. LEGAL - Not Applicable. Nationwide. Locatable Mining Rule - 36 CFR - Regulations, Directives, In Progress: Expected:12/2021 12/2021 Sarah Shoemaker 228, subpart A. Orders NOI in Federal Register 907-586-7886 EIS 09/13/2018 [email protected] d.us *UPDATED* Est. DEIS NOA in Federal Register 03/2021 Description: The U.S. Department of Agriculture proposes revisions to its regulations at 36 CFR 228, Subpart A governing locatable minerals operations on National Forest System lands.A draft EIS & proposed rule should be available for review/comment in late 2020 Web Link: http://www.fs.usda.gov/project/?project=57214 Location: UNIT - All Districts-level Units. STATE - All States. COUNTY - All Counties. LEGAL - Not Applicable. These regulations apply to all NFS lands open to mineral entry under the US mining laws.
    [Show full text]
  • Threats to Cross-Border Wildlife Linkages in the Sky Islands Wildlands Network
    Threats to Cross-Border Wildlife Linkages in the Sky Islands Wildlands Network Kim Vacariu Wildlands Project, Tucson, AZ Abstract—One of the greatest challenges facing conservationists in the Sky Islands region is finding a realistic means to maintain historic travel routes for wide-ranging species crossing the United States-Mexico border. This challenge is made difficult due to the ongoing efforts by the Federal government to install additional security infrastructure to stem the flood of undocumented immigrants now entering southern Arizona. Existing and proposed fencing, solid steel walls, all- night stadium lighting, vehicle barriers, an immense network of roads, a 24-hour flow of patrol vehicles, and low-level aircraft overflights are creating an impenetrable barrier to trans-border wildlife movement. Creative solutions are needed now. northern Mexico, and the Sky Islands of southeastern Arizona Introduction were maintained. In 2000, the Wildlands Project and regional partner groups, The SIWN CP identified numerous threats to a healthy including the Sky Island Alliance, published a conservation landscape in the Sky Islands, including fragmentation of plan covering more than 10 million acres of valuable wildlife habitat by roads, fences, and subdivisions; loss or extirpation habitat in the Sky Islands ecoregion of southeast Arizona and of numerous species; loss of natural disturbance regimes such southwest New Mexico. The document, known as the Sky as fire; loss of riparian areas, streams, and watersheds; inva- Islands Wildlands Network Conservation Plan (SIWN CP), is sion by exotic species; and loss of native forests to logging based on the basic tenets of conservation biology, and a sci- and other development.
    [Show full text]
  • Geologic Map of the Patagonia Mountains, Santa Cruz County, Arizona
    Geologic Map of the Patagonia Mountains, Santa Cruz County, Arizona By Frederick T. Graybeal, Lorre A. Moyer, Peter G. Vikre, Pamela Dunlap, and John C. Wallis Pamphlet to accompany Open-File Report 2015–1023 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior SALLY JEWELL, Secretary U.S. Geological Survey Suzette M. Kimball, Acting Director U.S. Geological Survey, Reston, Virginia: 2015 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment—visit http://www.usgs.gov or call 1–888–ASK–USGS (1–888–275–8747) For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Suggested citation: Graybeal, F.T., Moyer, L.A., Vikre, P.G., Dunlap, P., and Wallis, J.C., 2015, Geologic map of the Patagonia Mountains, Santa Cruz County, Arizona: U.S. Geological Survey Open-File Report 2015– 1023, 10 p., 1 sheet, scale 1:48,000, http://dx.doi.org/10.3133/ofr20151023. ISSN 2331-1258 (online) Contents Abstract ......................................................................................................................................................................
    [Show full text]
  • Geology of the Granite Peak Stock Area, Whetstone Mountains, Cochise County, Arizona
    Geology of the Granite Peak stock area, Whetstone Mountains, Cochise County, Arizona Item Type text; Thesis-Reproduction (electronic); maps Authors DeRuyter, Vernon Donald Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 07/10/2021 05:09:43 Link to Item http://hdl.handle.net/10150/555132 GEOLOGY OF THE GRANITE PEAK STOCK AREA, WHETSTONE MOUNTAINS, COCHISE COUNTY, ARIZONA by Vernon Donald DeRuyter A Thesis Submitted to the Faculty of the DEPARTMENT OF GEOSCIENCES In Partial Fulfillment of the Requirements For the Degree of MASTER OF SCIENCE In the Graduate College THE UNIVERSITY OF ARIZONA 1 9 7 9 STATEMENT BY AUTHOR This thesis has been submitted in partial fulfillment of require­ ments for an advanced degree at The University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the Library. Brief quotations from this thesis are allowable without special permission, provided that accurate acknowledgment of source is made. Re­ quests for permission for extended quotation from or reproduction of this manuscript in whole or in part may be granted by the head of the major de­ partment or the Dean of the Graduate College when in his judgment the pro­ posed use of the material is in the interests of scholarship. In all other instances, however, permission must be obtained from the author.
    [Show full text]
  • Major Geologic Structures Between Lordsburg, New Mexico, and Tucson, Arizona Harald D
    New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/29 Major geologic structures between Lordsburg, New Mexico, and Tucson, Arizona Harald D. Drewes and C. H. Thorman, 1978, pp. 291-295 in: Land of Cochise (Southeastern Arizona), Callender, J. F.; Wilt, J.; Clemons, R. E.; James, H. L.; [eds.], New Mexico Geological Society 29th Annual Fall Field Conference Guidebook, 348 p. This is one of many related papers that were included in the 1978 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks. Copyright Information Publications of the New Mexico Geological Society, printed and electronic, are protected by the copyright laws of the United States.
    [Show full text]
  • Stories of the Sky Islands: Exhibit Development Resource Guide for Biology and Geology at Chiricahua National Monument and Coronado National Memorial
    Stories of the Sky Islands: Exhibit Development Resource Guide for Biology and Geology at Chiricahua National Monument and Coronado National Memorial Prepared for the National Park Service under terms of Cooperative Ecosystems Studies Unit Agreement H1200-05-0003 Task Agreement J8680090020 Prepared by Adam M. Hudson,1 J. Jesse Minor,2,3 Erin E. Posthumus4 In cooperation with the Arizona State Museum The University of Arizona Tucson, AZ Beth Grindell, Principal Investigator May 17, 2013 1: Department of Geosciences, University of Arizona ([email protected]) 2: School of Geography and Development, University of Arizona ([email protected]) 3: Laboratory of Tree-Ring Research, University of Arizona 4: School of Natural Resources and the Environment, University of Arizona ([email protected]) Table of Contents Introduction ........................................................................................................................3 Beth Grindell, Ph.D. Ch. 1: Current research and information for exhibit development on the geology of Chiricahua National Monument and Coronado National Memorial, Southeast Arizona, USA..................................................................................................................................... 5 Adam M. Hudson, M.S. Section 1: Geologic Time and the Geologic Time Scale ..................................................5 Section 2: Plate Tectonic Evolution and Geologic History of Southeast Arizona .........11 Section 3: Park-specific Geologic History – Chiricahua
    [Show full text]
  • Coronado National Forest
    CORONADO NATIONAL FOREST FIRE MANAGEMENT PLAN Reviewed and Updated by _/s/ Chris Stetson ___________ Date __5/18/10 __________ Coronado Fire Management Plan Interagency Federal fire policy requires that every area with burnable vegetation must have a Fire Management Plan (FMP). This FMP provides information concerning the fire process for the Coronado National Forest and compiles guidance from existing sources such as but not limited to, the Coronado National Forest Land and Resource Management Plan (LRMP), national policy, and national and regional directives. The potential consequences to firefighter and public safety and welfare, natural and cultural resources, and values to be protected help determine the management response to wildfire. Firefighter and public safety are the first consideration and are always the priority during every response to wildfire. The following chapters discuss broad forest and specific Fire Management Unit (FMU) characteristics and guidance. Chapter 1 introduces the area covered by the FMP, includes a map of the Coronado National Forest, addresses the agencies involved, and states why the forest is developing the FMP. Chapter 2 establishes the link between higher-level planning documents, legislation, and policies and the actions described in FMP. Chapter 3 articulates specific goals, objectives, standards, guidelines, and/or desired future condition(s), as established in the forest’s LRMP, which apply to all the forest’s FMUs and those that are unique to the forest’s individual FMUs. Page 1 of 30 Coronado Fire Management Plan Chapter 1. INTRODUCTION The Coronado National Forest developed this FMP as a decision support tool to help fire personnel and decision makers determine the response to an unplanned ignition.
    [Show full text]
  • Connecting Mountain Islands and Desert Seas
    The Forgotten Flora of la Frontera Thomas R. Van Devender and Ana Lilia Reina Arizona-Sonora Desert Museum, Tucson, AZ Abstract—About 1,500 collections from within 100 kilometers of the Arizona border in Sonora yielded noteworthy records for 164 plants including 44 new species (12 non-native) for Sonora and 12 (six non-native) for Mexico, conservation species, and regional endemics. Many com- mon widespread species were poorly collected. Southern range extensions (120 species) were more numerous than northern extensions (20), although nine potentially occur in Arizona. Non-native species dispersed along highways and escaped from cultivation. The Turkish poppy (Glaucium corniculatum), established near Agua Prieta, may reach Arizona. African buffelgrass (Pennisetum ciliare) and Natal grass (Melinis repens) are rapidly expanding into new, higher elevation areas. Beginning with Howard Gentry, Forrest Shreve, and Ira Introduction Wiggins in the 1930s, botanists from the United States rushed In northeastern Sonora, grassland and Chihuahuan southward to the tantalizing tropical deciduous forests of the desertscrub extend across the border from Arizona and Río Mayo region of southeastern Sonora, the treasures of the New Mexico. Isolated “sky island” mountains support oak Sierra Madre Occidental in eastern Sonora (Gentry 1942; woodlands and pine-oak forests in the Apachean Highlands Martin et al. 1998), or the scenic Sonoran Desert (Shreve and Ecoregion, the northwestern Madrean Archipelago extend- Wiggins 1964). Botanists from Mexico City 2,200 km to the ing northeast of the “mainland” Sierra Madre Occidental. southeast only occasionally visited Sonora. Solis G. (1993) and Finger-like northern extensions of foothills thornscrub lie in Fishbein et al.
    [Show full text]
  • Uranium Mineralization in the Guindani Canyon Area of the Northern Whetstone Mountains, Cochise County, Arizona
    Uranium mineralization in the Guindani Canyon area of the northern Whetstone Mountains, Cochise County, Arizona by Russell M. Corn, Richard Ahern, and Jon Spencer Arizona Geological Survey Contributed Report CR-08-B version 1.0 June 2008 21 page text Arizona Geological Survey 416 W. Congress St., #100, Tucson, Arizona 85701 The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the Arizona Geological Survey. 1 Arizona Geological Survey Contributed Report CR-08-B Proposed Mineral Withdrawal, Guindani Basin Area Northern Whetstone Mts., Cochise County, AZ Russell M. Corn (Registered Geologist) ______________________________________ The Coronado National Forest proposed a mineral withdrawal of approximately 2,600 acres covering all of the Guindani Basin drainage as shown on the attached copy of a topographic map. The proposed withdrawal includes virtually all of the Northern Whetstone Mining District, an area with numerous old small mines, prospects, known occurrences and past production of uranium, tungsten, fluorite and silica. It also includes the entire surface exposures of unusual alaskitic altered granite that contains disseminated fluorite and uranium minerals. Attached are copies of gamma logs and uranium assay logs fro three drill holes in the alaskite and a copy of a summary of Rocky Mountain Energy’s drilling results for uranium in shear and fracture zones on claims north of the alaskite exposures. The uranium exploration effort was carried out between 1973 and 1976 and the effort was terminated when the bottom dropped out of the uranium market.
    [Show full text]
  • The Patagonia Area Mining Districts, Santa Cruz County, Arizona, 1530
    Chapter 3 THE PATAGONIA AREA MINING DISTRICTS, Santa Cruz County, Arizona, 1539-1930 © 1998 Robert Lenon The Patagonia Mining Districts, for purposes of this worked by Indians because of the number of worn­ article are defined as the area lying within 20 miles out or broken stone hammers found at the site. of the Town of Patagonia and within what is now Similar evidence exists in the Salero-Alto vicinity Santa Cruz County, Arizona. Local custom and in the Tyndall District. The author has also observed usage has divided this region into eight mining dis­ an irregular shallow pit in the extreme southeast tricts: The Santa Rita Mountains and its foothills comer of Pima County, excavating a narrow veinlet are included within the Greaterville, Tyndall, Aztec of azurite-chrysocolla that appeared to have been and Wrightson Mining Districts, and then, begin­ explored by primitive means. This inference was ning with the Nogales District encompassing the strengthened, although not necessarily confirmed, area around Mt. Benedict northeast of Nogales, by the presence of a lone flint arrowhead found in a Arizona, and proceeding east, one then finds the dump alongside the pit. Patagonia, Harshaw and Red Rock Mining Districts. All but the Nogales District have been for­ The earliest European traveler was probably the mally organized (mostly during the 1870s) follow­ Franciscan monk, Marcos de Niza, who traversed ing the procedures permitted under the federal min­ the San Pedro Valley twice in 1539 and then guided ing laws. the party of Francisco Vasquez de Coronado north­ ward along the San Pedro, which they called the The Town of Patagonia lies barely inside the "Nexpa," in search of the fabled Seven Cities of northerly limits of the Harshaw District, some Clbola in the spring of 1540.
    [Show full text]
  • Geodatabase of Post-Wildfire Study
    Geodatabase of Post-Wildfire Study Basins Assessing the predictive strengths of post-wildfire debris-flow models in Arizona and defining rainfall intensity-duration thresholds for initiation of post-fire debris flow Ann Youberg DIGITAL INFORMATION DI-44 July 2015 Arizona Geological Survey www.azgs.az.gov | repository.azgs.az.gov Arizona Geological Survey M. Lee Allison, State Geologist and Director Manuscript approved for publication in July 2015 Printed by the Arizona Geological Survey All rights reserved For an electronic copy of this publication: www.repository.azgs.az.gov Printed copies are on sale at the Arizona Experience Store 416 W. Congress, Tucson, AZ 85701 (520.770.3500) For information on the mission, objectives or geologic products of the Arizona Geological Survey visit www.azgs.az.gov. This publication was prepared by an agency of the State of Arizona. The State of Arizona, or any agency thereof, or any of their employees, makes no warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report. Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the State of Arizona. ___________________________ Suggested Citation: Youberg A., 2015, Geodatabase of Post-Wildfire Study Basins: Assessing the predictive strengths of post-wildfire debris-flow models inArizona, and defining rainfall intensity-duration thresholds for
    [Show full text]
  • Correlation of Volcanic Rocks in Santa Cruz County, Arizona
    87 CORRELATION OF VOLCANIC ROCKS IN SANTA CRUZ COUNTY, ARIZONA By Otner J. Taylor A study of the volcanic rocks in Santa Cruz County, Arizona, has been tnade through cotnpilation of previous work together with new investigations. These cotnpilations indicate that there are tnany sitnilarities of sequence and structure in the volcanic rocks of the Atascosa Mountains, Tutnacacori Mountains, Santa Rita Mountains, Patagonia Mountains, and Mustang Mountains of Santa Cruz County. The volcanic rocks of the Tucson Mountains to the north of Pitna County also show sitnilarities to the volcanic rocks in the ranges of Santa Cruz County. Previous studies were tnade in the Atascosa and Tutnacacori Mountains by Webb and Coryell (1954). The regional geology of the Santa Rita and Patagonia Mountains was tnapped by Schraeder (1915) although tnany localized studies have since been tnade by various authors. The geology of the Mustang Mountains was tnapped by Bryant (1951). The Tucson Mountains have been studied principally by Brown (1939) and Kinnison (1958). A stratigraphic colutnn of the volcanic rocks of each range has been construc­ ted. These colutnns are shown on Plate 1. The generalized sequence in each case is: Cretaceous (?) andesite and rhyolite; Tertiary andesite, rhyolite, tuff, rhyolite-latite, and andesite; and Quaternary (?) basalt. The rocks were dated by using the principle of superposition as well as the following hypotheses: the rocks thought to be Cretaceous also are badly faulted and tilted and a pre-Laratnide age is suggested; the rocks thought to be Tertiary are thick and only gently tilted so that a post-Laratnide age is suggested; the upper andesites of this Tertiary sequence are not tilted, and they are probably post-Lower Miocene since they have structural and sequential sitnilarities with the andesites associated with the Lower Miocene Minetta beds and their probable equivalent, the Pantano fortnation; the rocks thought to be Quaternary are rela­ tively undisturbed and they overlie gravels and lake beds thought to be late Pliocene and Pleistocene.
    [Show full text]