DOCSLIB.ORG

Geology and Gravity of the Lilesville Granite Batholith, North Carolina

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Geology and Gravity of the Lilesville Granite Batholith, North Carolina JOHN D. WASKOM Department of Geology, Northwestern State University of Louisiana, Natchitocbes, Louisiana 71457 J. ROBERT BUTLER Department of Geology, Unit/ersity of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514 Geology and Gravity of the Lilesville Granite Batholith, North Carolina named the Lilesville Granite, was exposed in ABSTRACT Anson and Richmond Counties, North The Lilesville Granite is the southernmost Carolina (Watson and Laney, 1906). Mann and granite intrusion of the Eastern Piedmont in Zablocki (1961, p. 198) reported a large posi- North Carolina. It is a sheet or tongue-shaped tive Bouguer gravity anomaly associated with concordant mass extending to a maximum the intrusion. Since granitic batholiths charac- depth of about 1.75 mi. It is surrounded by a teristically have a negative gravity anomaly contact aureole of metasedimentary mica schist (Bott, 1962), the situation seemed unusual. and mica gneiss and has an areal extent of 125 Furthermore, V. I. Mann (1963, oral com- sq mi. The granite is characterized by a porphy- mun.) found that the intrusion was the only ritic rapakivi texture with a medium- to coarse- large area of granite shown on the Geologic grained matrix of plagioclase, quartz, and Map of North Carolina (1958) that had a posi- biotite. The intrusion is compositionally zoned tive anomaly. Reconnaissance by H. D. Wa- and consists of adamellite, granodiorite, and gener (1962, oral commun.) disclosed that a tonalite. The granite is considered to have been small gabbro pluton was present in part of the emplaced as a crystal mush and to have crystal- area previously mapped as granite. lized in place. The modal variations and tex- The present report uses petrology and geo- tural features of the granite may be due to physics in an attempt to determine the three- crystal settling, contamination, and rapid late- dimensional configuration of the granite and stage crystallization (sudden escape of water gabbro intrusions, the nature and origin of the pressure). mineralogical variation in the granite, and the A large positive Bouguer anomaly associated geologic history of the region. with the granite is attributed to two major fea- The Lilesville Granite is one of a group of tures: (1) a gabbro body which intrudes the postmetamorphic granitic batholiths and stocks granite near its eastern margin, and (2) a mica located mainly in the Carolina Slate belt and gneiss unit which underlies the batholith. Charlotte belt (Butler and Ragland, 1969). The The proposed sequence of geologic events is: plutons are mostly adamellite and granodiorite, (1) deposition of felsic volcanic rocks and argil- and none studied so far has a significant propor- lites, (2) formation of the proposed anticline tion of closely related mafic rocks. and low-rank regional metamorphism, (3) in- The gabbro of the present study is one of trusion and crystallization of the Lilesville about 30 plutons in North and South Carolina Granite and the formation of the mica gneiss that comprise a gabbro-diorite-syenite differen- and mica schist units by thermal metamor- tiation suite (Butler and Ragland, 1969; Price, phism, (4) intrusion of gabbro body into the 1969). Lilesville Granite, (5) Triassic faulting and sedi- mentation, (6) intrusion of Triassic or Jurassic AREAL GEOLOGY dikes, and (7) deposition of Cretaceous and Tertiary sands and gravels. Field Procedure The previously existing geologic maps of the INTRODUCTION Lilesville Granite area did not indicate the gab- It was recognized more than sixty years ago bro unit or major dikes; therefore, an area of that a large granitic intrusion (Fig. 1), here about 325 sq mi was remapped during the sum- Geological Society of America Bulletin, v. 82, p. 2827-2844, 12 figs., October 1971 2827 Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/82/10/2827/3432770/i0016-7606-82-10-2827.pdf by guest on 02 October 2021 EXPLANATION S T A N L Fault tract Fault tract Contact lint -CRETACEOUS kTRIASSIC PRECAMBRIAN ? a PALEOZOIC SCOTLAND AFTER GEOLOGIC MAP OF NORTH CAROLINA (1958) \ Kbc V N \ Feliic volcanic: \ Scalt of Miltt Figure 1. Index map showing the geologic setting of the area studied. Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/82/10/2827/3432770/i0016-7606-82-10-2827.pdf by guest on 02 October 2021 Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/82/10/2827/3432770/i0016-7606-82-10-2827.pdf by guest on 02 October 2021 AREAL GEOLOGY 2829 mers of 1963 and 1964. The collection of gran- eastward to a very dense bluish-gray phyllite, ite samples for the petrographic study on a grid which probably indicates an increase in the de- basis was not feasible for two reasons: (1) the gree of metamorphism from west to east. Lilesville Granite is deeply weathered over a The argillite along the eastern border of the large portion of the exposure, and (2) large Wadesboro basin has an average strike of N. patches of sand and gravel (Fig. 2) mask the 44° E. and dip 25° NW. (Randazzo, 1965, p. granite batholith. Consequently, 41 granite 12). Southeast of the Pee Dee River, the aver- samples were obtained to give a representative age strike of the argillite is N. 70° E. and dip coverage of the exposed batholith (Fig. 2), and 30° SE. A southwest-plunging anticline is in- additional samples were collected from other ferred on the basis of attitude of beds and loca- rock units. Waskom (1970) shows a location tion of older units (Fig. 2). The axial plane map for all samples collected in the present strikes about N. 58° E. This anticline is parallel study. to an anticline mapped by Floyd (1965) in the western part of Anson County and eastern Un- Field Descriptions and Relationships ion County, North Carolina, and is nearly par- The Lilesville Granite has an elliptical out- allel to the northeast trend of the Triassic basin. crop pattern with a total areal extent of approxi- The mica gneiss unit has an irregularly mately 125 sq mi (Fig. 2); an area of about 40 shaped outcrop pattern. It is gray, medium-to- sq mi of this total is covered by younger sedi- coarse textured, and consists of foliated biotite ments. gneiss and some sericite schist. The granite is prophyritic in texture and is The aureole is a narrow belt of rocks which medium-grained to very coarse-grained. The completely encircles the batholith except where dominant minerals are pink K-feldspar pheno- it is cut by Triassic faults (Fig. 2). This zone crysts in a matrix of light-gray plagioclase, col- consists of deeply weathered schist, phyllite, orless quartz, and biotite. In some outcrops, the and biotite gneiss. The outer portion of the long axes of the K-feldspar phenocrysts have a mica schist unit is gradational with the argillite preferred orientation in the horizontal plane. and felsic volcanic units. The contact between Muscovite and magnetite occur in minor the aureole and granite is generally sharp. Nu- amounts. Numerous mica gneiss xenoliths are merous quartz veins are present in the aureole found throughout the batholith. They are more but not in the granite. abundant near the outer margin of the batholith Where the aureole is exposed along the and near the contact adjacent to the mica gneiss northern, southern, and western edge of the unit. Granite appears to be chilled where it is batholith, thin to massive resistant bands of bio- in contact with large xenoliths near the mica tite gneiss strike parallel to the granite contact. gneiss unit. Xenoliths range from pea size to In hand specimen, the biotite gneiss is very small boulder size. similar in all respects to the mica gneiss unit. Three sets of vertical fractures occur in the The following interpretation is based on li- granite. One set has an average strike of N. thologic similarities between the mica gneiss 45 ° W., another set has an average strike of N. unit and the biotite gneiss zones within the au- 75° E., and a poorly developed set strikes reole, but few quantitative data are available. north-south. In most localities, the granite is The aureole represents both felsic volcanic and strongly fractured, particularly adjacent to the argillite rocks that were metamorphosed when gabbro intrusion and the margins of the bath- the granite batholith was emplaced. The mica olith. K-feldspar crystals in hand specimens col- gneiss unit and the zones of biotite gneiss in the lected at several of these localities are cut by aureole are therefore higher rank metamorphic numerous quartz veinlets. equivalents of the felsic volcanic unit. Also, the The metamorphic host rocks of the Lilesville mica schist and phyllite zones in the aureole are Granite are a felsic volcanic unit overlain by a the metamorphic equivalent of the argillite tuffaceous argillite unit. The volcanic unit is unit. mostly tuffs and flows(?) metamorphosed to In the eastern portion of the Lilesville Gran- phyllite and slate. Floyd (1965, p. 15) states ite, a gabbro intrusion is exposed over an area that the argillite is generally of low meta- of about 6 sq mi. This unit ranges in composi- morphic rank except in areas adjacent to the tion from a gabbro (central portion) to a diorite Gold Hill fault and intrusive bodies, where it is (outer portion). It is a massive, coarse-textured of medium metamorphic rank. In the northern rock composed of hornblende, olivine, plagio- portion of the study area, the argillite grades clase, pyroxene, and accessory minerals. Nu- Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/82/10/2827/3432770/i0016-7606-82-10-2827.pdf by guest on 02 October 2021 2830 WASKOM AND BUTLER—LILESVILLE BATHOLITH, NORTH CAROLINA merous rounded residual boulders were clays.
Load more

Recommended publications
  • Part 629 – Glossary of Landform and Geologic Terms
    Title 430 – National Soil Survey Handbook Part 629 – Glossary of Landform and Geologic Terms Subpart A – General Information 629.0 Definition and Purpose This glossary provides the NCSS soil survey program, soil scientists, and natural resource specialists with landform, geologic, and related terms and their definitions to— (1) Improve soil landscape description with a standard, single source landform and geologic glossary. (2) Enhance geomorphic content and clarity of soil map unit descriptions by use of accurate, defined terms. (3) Establish consistent geomorphic term usage in soil science and the National Cooperative Soil Survey (NCSS). (4) Provide standard geomorphic definitions for databases and soil survey technical publications. (5) Train soil scientists and related professionals in soils as landscape and geomorphic entities. 629.1 Responsibilities This glossary serves as the official NCSS reference for landform, geologic, and related terms. The staff of the National Soil Survey Center, located in Lincoln, NE, is responsible for maintaining and updating this glossary. Soil Science Division staff and NCSS participants are encouraged to propose additions and changes to the glossary for use in pedon descriptions, soil map unit descriptions, and soil survey publications. The Glossary of Geology (GG, 2005) serves as a major source for many glossary terms. The American Geologic Institute (AGI) granted the USDA Natural Resources Conservation Service (formerly the Soil Conservation Service) permission (in letters dated September 11, 1985, and September 22, 1993) to use existing definitions. Sources of, and modifications to, original definitions are explained immediately below. 629.2 Definitions A. Reference Codes Sources from which definitions were taken, whole or in part, are identified by a code (e.g., GG) following each definition.
    [Show full text]
  • Washington Division of Geology and Earth Resources Open File Report
    OF~ 76-~ PETR)3ENFSIS OF THE MXJNT STUART BATHOLITH PID:rrnIC EQJI\7ALENT OF THE HIGH-AIJ.JMINA BASALT ASSO:IATION by Erik H. Erikson Jr. Depart:rrent of Geology Eastern Washington State College Cheney ,Wc::.shington 99004 June 1, 1976 Abstract. The 1-bunt Stuart batholith is a Late Cretaceous calc-alkaline pluton · . canposed of intrusive phases ranging in canposition fran two-pyroxene gabbro to granite. This batholith appears to represent the plutonic counterpart of the high-alumina basalt association. Mineralogical, petrological and chrono­ logical characteristics are consistent with a m:::rlel in which the intrusive series evolved fran one batch of magnesian high-alumina basalt by successive crystal fractionation of ascending residual magrna. ' canputer m:::rleling of this intrusive sequence provides a quanti- tative evaluation of the sequential change of magrna CCIIlfX)sition. These calculations indicate that this intrusive suite is consanguineous, and that subtraction of early-fonned crystals £ran the oldest magrna is capable of reprcducing the entire magrna series with a remainder of 2-3% granitic liquid. Increasing f()tash discrepancies prcduced by the rrodeling may reflect the increasing effects of volatile transfer in progressively rrore hydrous and silicic melts. Mass-balances between the arrounts of curn-ulate and residual liquid ccnpare favorably with the observed arrounts of intenrediate rocks exposed in the batholith, but not with the mafic rocks. Ma.fie cum: ulates must lie at depth. Mafic magmas probably fractionated by crystal settling, while quartz diorite and rrore granitic magrnas underwent a process of inward crystallization producing exposed gradationally zoned plutons.Aat present erosional levels.
    [Show full text]
  • Tectonic Evolution of the Northern Sierra Nevada
    TECTONIC EVOLUTION OF THE NORTHERN SIERRA NEVADA BATHOLITH A DISSERTATION SUBMITTED TO THE DEPARTMENT OF GEOLOGICAL AND ENVIRONMENTAL SCIENCES AND THE COMMITTEE ON GRADUATE STUDIES OF STANFORD UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY Nicholas James Van Buer December 2011 © 2011 by Nicholas James Van Buer. All Rights Reserved. Re-distributed by Stanford University under license with the author. This work is licensed under a Creative Commons Attribution- Noncommercial 3.0 United States License. http://creativecommons.org/licenses/by-nc/3.0/us/ This dissertation is online at: http://purl.stanford.edu/xb187vq0064 Includes supplemental files: 1. Plate 1. Geologic Map of the Jayhawk Well 7.5' Quadrangle, Pershing County, Nevada (jayhawkwell.pdf) 2. Plate 2. Geologic Map of the Juniper Pass 7.5' Quadrangle, Pershing County, Nevada (Juniperpass.pdf) 3. Plate 3. Geologic Map of the Tohakum Peak NE 7.5' Quadrangle, Pershing County, Nevada (TohakumpkNE.pdf) 4. Plate 4. Geologic Map of the Tunnel Spring 7.5' Quadrangle, Pershing County, Nevada (tunnelspr.pdf) 5. Plate 5. Geologic Map of the Bob Spring 7.5' Quadrangle, Pershing County, Nevada (bobspring.pdf) 6. Plate 6. Geologic Map of the Tohakum Peak SE 7.5' Quadrangle, Pershing County, Nevada (TohakumpkSE.pdf) 7. Plate 7. Geologic Map of the Sage Hen Spring 7.5' Quadrangle, Pershing County, Nevada (SageHenSpr.pdf) 8. Plate 8. Geologic Map of the Bluewing Spring 7.5' Quadrangle, Pershing County, Nevada (BluewingSpr.pdf) ii I certify that I have read this dissertation and that, in my opinion, it is fully adequate in scope and quality as a dissertation for the degree of Doctor of Philosophy.
    [Show full text]
  • The Boulder Creek Batholith, Front Range, Colorado
    I u The Boulder Creek Batholith, Front Range, Colorado By DOLORES J. GABLE GEOLOGICAL SURVEY PROFESSIONAL PAPER 1101 A study of differentiation, assimilation, and origin of a granodiorite batholith showing interrelated differences in chemistry and mineralogy in the batholith and cogenetic rock types UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1980 UNITED STATES DEPARTMENT OF THE INTERIOR CECIL D. ANDRUS, Secretary GEOLOGICAL SURVEY H. William Menard, Director Library of Congress Cataloging in Publication Data Gable, Dolores J. 1922- The Boulder Creek batholith, Front Range, Colorado (Geological Survey Professional Paper 1101) Bibliography: p. 85 Supt. of Docs. No.: I 19.16:1101 1. Batholiths Colorado Boulder region. I. Title. II. Series: United States Geological Survey Professional Paper 1101. QE611.5.U6G3 551.8; 8 78-24482 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 CONTENTS Page Page Abstract................................................ 1 Origin of the Boulder Creek Granodiorite and the Twin Introduction ............................................ 1 Spruce Quartz Monzonite .......................... 62 Previous work........................................... 2 Mineralogy, petrology, and chemistry of minerals in the Techniques used in this study ............................ 2 batholith.......................................... 64 Geologic setting ......................................... 3 Biotite ...'........................................... 64 The batholith ..........................................
    [Show full text]
  • The Sierra Nevada Batholith a Synthesis. of Recent Work Across the Central Part
    I _; The Sierra Nevada Batholith A Synthesis. of Recent Work Across the Central Part By PAUL C. BATEMAN, LORIN ~- CLARK, N. KING HUBER, JAMES G. MOORE, and C. DEAN RINEHART SHORTER CONTRIBU.TIONS TO GENERAL GEOLOGY· G E 0 L 0 G I CAL SURVEY P R 0 FE S S I 0 N A L PAPER 414-D Prepared in cooperation with the State of Caltfornia, Division of Mines and Geology · ti II R fA u 0 F u' N f I ._rBRARV SPUI\ANf:.. !NASH. JUN 31971 . ·~-~ - ~ ... -- --s PtfASf RfT,fJR~ fO liBRARY UNITED S.TATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1963 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C., 20402 CONTENTS Page Abstract------------------------------------------- D1 Constitution' of the batho1ith-Continued Introduction ______________________________________ _ 2 Contact relations _______________ ~ ______ - -- _----- D22 Genernl geologic relations _______________________ _ 2 Contacts between different granitic rocks _____ - 22 Previous geologic work _________________________ _ 4 Contacts between granitic rocks and meta- Acknowledgments _____________________________ _ 5 morphic rocks or diorite ___________ -- __ ---- 22 Wu.llrocks u.nd roof rocks ___________________________ _ 5 Felsic dike swarms __________________ - ___ -------- 24 Pu.leozoic rocks ________________________________ _ 5 Mafic dike swarms _________________________ ----- 25 Mesozoic rocks ________________________________ _ 6 Structure
    [Show full text]
  • Structure and Emplacement of the Eocene Golden Horn Batholith, North Cascades, Washington
    San Jose State University SJSU ScholarWorks Master's Theses Master's Theses and Graduate Research Spring 2018 Structure and Emplacement of the Eocene Golden Horn Batholith, North Cascades, Washington Christopher Scudder San Jose State University Follow this and additional works at: https://scholarworks.sjsu.edu/etd_theses Recommended Citation Scudder, Christopher, "Structure and Emplacement of the Eocene Golden Horn Batholith, North Cascades, Washington" (2018). Master's Theses. 4919. DOI: https://doi.org/10.31979/etd.p6p4-am45 https://scholarworks.sjsu.edu/etd_theses/4919 This Thesis is brought to you for free and open access by the Master's Theses and Graduate Research at SJSU ScholarWorks. It has been accepted for inclusion in Master's Theses by an authorized administrator of SJSU ScholarWorks. For more information, please contact [email protected]. STRUCTURE AND EMPLACEMENT OF THE EOCENE GOLDEN HORN BATHOLITH, NORTH CASCADES, WASHINGTON A Thesis Presented to The Faculty of the Department of Geology San José State University In Partial Fulfillment of the Requirement for the Degree Master of Science by Christopher A. Scudder May 2018 © 2018 Christopher A. Scudder ALL RIGHTS RESERVED The Designated Thesis Committee Approves the Thesis Titled STRUCTURE AND EMPLACEMENT OF THE EOCENE GOLDEN HORN BATHOLITH, NORTH CASCADES, WASHINGTON by Christopher A. Scudder APPROVED FOR THE DEPARTMENT OF GEOLOGY SAN JOSÉ STATE UNIVERSITY May 2018 Dr. Robert Miller Department of Geology Dr. Ellen Metzger Department of Geology Dr. Jonathan Miller Department of Geology ABSTRACT STRUCTURE AND EMPLACEMENT OF THE EOCENE GOLDEN HORN BATHOLITH, NORTH CASCADES, WASHINGTON By Christopher A. Scudder The 48 Ma Golden Horn batholith is a ~310 km2, shallow intrusion constructed of sub-horizontal sheets in the crystalline core of the North Cascades of Washington.
    [Show full text]
  • Age Determinations of Tee Rocks of the Batholiths of Baja Amd Southern
    Ao. AGE DETERMINATIONS OF TEE ROCKS OF THE BATHOLITHS OF BAJA AMD SOUTHERN CALIFORNIA, SIERRA NEVADA, IDAHO, AND THE COAST RANGE OF WASHINGTON, BRITISH COLUMBIA, AND ALASKA* By Eo S, Larsen, Jr., David Gottfried, H. W. Jaffe, and C. L. Waring Augast 1957 Trace Elements Investigations Report 695 GEOLOGIC^ _ '•$.-'- DENVER *U$ This preliminary report is distributed •without editorial and technical review for conformity with official standards and nomenclature. It is not for public inspection or *This report concerns work done on "behalf of the Division of Research of the U« S. Atomic Energy Commission. USGS - TEI-695 GEOLOGY mD MINERALOGY Distribution If6. of copies Division of Ifew Materials, Albuquerque 0 <>*«,»,,«.**.««*»»»»*„*.**» 1 DiTision of Raw Materials, Austin .«...»«»...*»*.<,..«.***»*»...*. 1 Division of Raw Materials, Casper *»»,.*»«*.*. 0 ....„,,..«,......... 1 Division of Raw Materials, Denver ».».«,«»»««*.«.................. 1 Division of Raw Materials, Rapid City ..».„...».......*»....,.,.. 1 Division of Raw Materials, Salt Lake City ... , 0 .. o........ e ...... 1 Division of Raw Materials, Spokane .*.. 0 .*..».»*.*».*•»...*»»**.* 1 Division of Raw Materials, Washington ..,.. ..„,„<>. 0 .............. 5 Division of Research, Washington ......<,„..„*.„.„.,.<>,........... 1 Exploration Division, Grand Junction Operations Office .......... 1 Grand Junction Operations Office ......o......... a............... 1 Technical Information Service Extension, Oak Ridge 88 »........... 6 U» S» Geological Survey? Foreign Geology Branch,
    [Show full text]
  • Glossary of Geological Terms
    GLOSSARY OF GEOLOGICAL TERMS These terms relate to prospecting and exploration, to the regional geology of Newfoundland and Labrador, and to some of the geological environments and mineral occurrences preserved in the province. Some common rocks, textures and structural terms are also defined. You may come across some of these terms when reading company assessment files, government reports or papers from journals. Underlined words in definitions are explained elsewhere in the glossary. New material will be added as needed - check back often. - A - A-HORIZON SOIL: the uppermost layer of soil also referred to as topsoil. This is the layer of mineral soil with the most organic matter accumulation and soil life. This layer is not usually selected in soil surveys. ADIT: an opening that is driven horizontally (into the side of a mountain or hill) to access a mineral deposit. AIRBORNE SURVEY: a geophysical survey done from the air by systematically crossing an area or mineral property using aircraft outfitted with a variety of sensitive instruments designed to measure variations in the earth=s magnetic, gravitational, electro-magnetic fields, and/or the radiation (Radiometric Surveys) emitted by rocks at or near the surface. These surveys detect anomalies. AIRBORNE MAGNETIC (or AEROMAG) SURVEYS: regional or local magnetic surveys that measures deviations in the earth=s magnetic field and carried out by flying a magnetometer along flight lines on a pre-determined grid pattern. The lower the aircraft and the closer the flight lines, the more sensitive is the survey and the more detail in the resultant maps. Aeromag maps produced from these surveys are important exploration tools and have played a major role in many major discoveries (e.g., the Olympic Dam deposit in Australia).
    [Show full text]
  • Nate Nahler G188 6/12/2008 Creation of the Sierra Nevada Batholith
    Nate Nahler G188 6/12/2008 Creation of the Sierra Nevada Batholith Abstract In the western United States lies one of the largest and highest mountain ranges on earth. Composed of vast quantities of Granitic rock the Sierra Nevada Mountains and the surrounding topography have distinct geologic structures which point to a period of intense deformation and magmatism as the region was formed. Through the analysis of rock types, chemical composition of those rocks, and the actual structures visible in the Sierra Nevada region and further east, it is apparent that many millions of years ago there was a collision between lithospheric plates on the western margin of the North American Plate. This collision caused subduction of the oceanic Farallon plate creating vast masses of magma which rose and crystallized to form the core of the mountain range we see today. In addition to the periods of magmatic intrusion the region went through several different phases of geological setting presenting itself in the sedimentary and metasedimentary rock structures visible today. Geographic & Geologic Setting The Sierra Nevada mountain range is the longest and highest such range in the lower 48 United States. The maximum range of elevation is 4400 meters in the south to 2700 meters in the north with a total length approaching 643km (Hill 2006). The range is surrounded by a tectonically active zone on the west coast of North America, primarily in the state of California, with small portions lying within Nevada. Currently to the west of the range lies a large transform plate boundary, the San Andreas Fault, which is still affecting the size and scope of the range today.
    [Show full text]
  • A Partial Glossary of Spanish Geological Terms Exclusive of Most Cognates
    U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY A Partial Glossary of Spanish Geological Terms Exclusive of Most Cognates by Keith R. Long Open-File Report 91-0579 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 1991 Preface In recent years, almost all countries in Latin America have adopted democratic political systems and liberal economic policies. The resulting favorable investment climate has spurred a new wave of North American investment in Latin American mineral resources and has improved cooperation between geoscience organizations on both continents. The U.S. Geological Survey (USGS) has responded to the new situation through cooperative mineral resource investigations with a number of countries in Latin America. These activities are now being coordinated by the USGS's Center for Inter-American Mineral Resource Investigations (CIMRI), recently established in Tucson, Arizona. In the course of CIMRI's work, we have found a need for a compilation of Spanish geological and mining terminology that goes beyond the few Spanish-English geological dictionaries available. Even geologists who are fluent in Spanish often encounter local terminology oijerga that is unfamiliar. These terms, which have grown out of five centuries of mining tradition in Latin America, and frequently draw on native languages, usually cannot be found in standard dictionaries. There are, of course, many geological terms which can be recognized even by geologists who speak little or no Spanish.
    [Show full text]
  • Plutonism in the Central Part of the Sierra Nevada Batholith, California
    Plutonism in the Central Part of the '5n«Sierra Nevada Batholith,* California *~r ._*» U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1483 Plutonism in the Central Part of the Sierra Nevada Batholith, California By PAUL C. BATEMAN U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1483 A study of the structure, composition, and pre-Tertiary history of the Sierra Nevada batholith in the Mariposa 1° by 2° quadrangle UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1992 U.S. DEPARTMENT OF THE INTERIOR MANUEL LUJAN, JR., Secretary U.S. GEOLOGICAL SURVEY DALLAS L. PECK, Director Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government Library of Congress Cataloging-in-Publication Data Bateman, Paul Charles, 1910- Plutonism in the central part of the Sierra Nevada batholith, California / by Paul C. Bateman p. cm. (U.S. Geological Survey professional paper ; 1483) Includes bibliographical references. 1. Batholiths Sierra Nevada Mountains (Calif, and Nev.) 2. Geology Sierra Nevada Mountains (Calif, and Nev.) I. Title. II. Series: Geological Survey professional paper ; 1483. QE11.5.U6B36 1992 91-14788 552M dc20 CIP For sale by the Books and Open-File Report Sales, U.S. Geological Survey, Federal Center, Box 25286, Denver, CO 80225 CONTENTS Page Hierarchical organization of granitic units 24 Introduction Plutons 25 Stratigraphic and structural setting Lithodemes 25 Metamorphism Late Proterozoic and Paleozoic strata of the White and Roof pendants, septa, and inclusions
    [Show full text]
  • Petrology and Structure Bayonne Batholith Southeastern British Columbia
    University of Montana ScholarWorks at University of Montana Graduate Student Theses, Dissertations, & Professional Papers Graduate School 1982 Petrology and structure Bayonne batholith southeastern British Columbia Philip M. Barrett The University of Montana Follow this and additional works at: https://scholarworks.umt.edu/etd Let us know how access to this document benefits ou.y Recommended Citation Barrett, Philip M., "Petrology and structure Bayonne batholith southeastern British Columbia" (1982). Graduate Student Theses, Dissertations, & Professional Papers. 7084. https://scholarworks.umt.edu/etd/7084 This Thesis is brought to you for free and open access by the Graduate School at ScholarWorks at University of Montana. It has been accepted for inclusion in Graduate Student Theses, Dissertations, & Professional Papers by an authorized administrator of ScholarWorks at University of Montana. For more information, please contact [email protected]. COPYRIGHT ACT OF 1976 Th is is an unpublished m a n u sc r ipt in w hich c o p y r ig h t sub ­ s i s t s . Any further r e p r in t in g of it s contents must be approved BY THE AUTHOR. MANSFIELD L ibrary Un iv e r s it y of Montana Da t e ! ____1 9 8 2 PETROLOGY AND STRUCTURE, BAYONNE BATHOLITH, SOUTHEASTERN BRITISH COLUMBIA by Philip M. Barrett B.S., University of Washington, 1974 Presented in partial fu lfillm e n t of the requirements for the degree of Master of Science UNIVERSITY OF MONTANA 1982 Approved by: c l / 1 / 7 g / t ' cTLtyytytxXOri. Chairman, Board of Examiners Dean, Graduate Scnbol ___________7 -X 7 ' S x - Date UMI Number: EP37885 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted.
    [Show full text]