DOCSLIB.ORG

Granitic Rocks of the Southern Coast Plutonic Complex and Northern Cascades of British Columbia

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Granitic Rocks of the Southern Coast Plutonic Complex and Northern Cascades of British Columbia Granitic rocks of the southern Coast Plutonic Complex and northern Cascades of British Columbia T. A. RICHARDS Geological Survey of Canada, Vancouver, British Columbia, Canada V6B I RS K. C. McTAGGART Department of Geological Sciences, University of British Columbia, Vancouver, British Columbia, Canada V6T I WS ABSTRACT The mapped area, about 170 km east of Vancouver, British Co- northern Cascades and of the adjacent part of the southern Coast lumbia, lies at the intersection of the northwest-trending Mountains, between Hope, British Columbia, and the international Mesozoic-early Cenozoic Coast Plutonic Complex and the north- boundary (Fig. 1). The mapped area, about 1,000 km2, lies 170 km trending late Cenozoic Cascade belt. The Late Cretaceous meso- east of Vancouver, British Columbia. The Trans-Canada Highway zonal Spuzzum intrusions (90 to 80 m.y. old) of the Coast Crystal- and many side roads give easy access to within about 10 km of any line Complex are made up of a central diorite complex and a mar- part of the area. The terrain is rugged, with local relief of more than ginal tonalite. Modal variation in the diorite, which is pyroxenic in 1,800 m (Fig. 2). Outcrops are abundant except in valley bottoms. the central parts and hornblendic in the marginal, was controlled n by Ph2o i the magma. The Yale intrusions (59 to 35 m.y. old), of Previous Work tonalite, granodiorite, and quartz monzonite, are stocks and sills that may represent the latest intrusions of the Coast Plutonic Com- R. A. Daly (1912) provided the first account of the geology of the plex. The Chilliwack composite batholith (40 to 16 m.y. old) is rep- southern part of the area. He named the Chilliwack batholith and resented by the Chilliwack batholith, the Mount Barr batholith, assigned to it a Miocene age. Cairnes (1924) mapped the northern and the Silver Creek stock; these epizonal batholiths consist largely part of the area and adjacent regions and summarized the regional of tonalite, granodiorite, and quartz monzonite. Variation in the geology of the Hope map-area (1944). The adjacent area, south of Chilliwack composite batholith is due mainly to differentiation at the international border as well as some parts on the Canadian side, depth, followed by minor evolution both as the various phases rose have been mapped and described in detail by Misch (1966) and his and also after they were emplaced. The Fraser River-Straight students. McTaggart and Thompson (1967) mapped along the Creek fault zone may have controlled the emplacement of many of eastern and northern borders of the area. Roddick and Hutchison the late Cenozoic plutons. During the past 40 m.y., intrusion and (1969) provided new information about the region to the north of volcanism may have been nearly continuous in southwestern the area. Monger mapped along the western side of the area (1966) British Columbia and Washington. Key words: igneous petrology, and prepared an updated edition of the Hope map-area (1970). granitic rocks, geochronology. McTaggart (1970) has written a tectonic history of the region. INTRODUCTION General Geology We describe here the origin, differentiation, and sequence of The area lies at the intersection of the Coast Mountains and the emplacement of the granitic rocks of the northern part of the Cascade Range (Figs. 1, 3). The Coast Mountains are carved into Figure 2. View northeast across northern half of study area. Geological Society of America Bulletin, v. 87, p. 935-9J3, 15 figs., June 1976, Doc. no. 60614. 935 Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/87/6/935/3429356/i0016-7606-87-6-935.pdf by guest on 01 October 2021 936 RICHARDS AND McTAGGART the northwest-trending Coast Plutonic Complex (Fig. 3), which is Washington (Misch, 1966, 1968), consists mainly of biotite gneiss, composed largely of tonalitic plutons and extends along the coast schist, amphibolite, and marble. It contains Precambrian zircons, of British Columbia and into Alaska a distance of nearly 1,700 km. possibly of detrital origin, and the age of the beds from which the The plutons appear to be mainly of Cretaceous age, but along the gneiss was derived is uncertain (Mattinson, 1972); widespread eastern flank they may be largely early Cenozoic in age (Hutchison, metamorphism and migmatization affected the unit in middle to 1970; Douglas, 1970). The Cascade Range consists of a north- Late Cretaceous time. The Skagit Volcanic Formation (Daly, trending belt of late Cenozoic volcanic and intrusive rocks that ex- 1912), or the Skagit Volcanics (Staatz and others, 1972), equivalent tends from California through Oregon and Washington and into to the Hannegan Volcanics (Misch, 1966), consists of andesitic and British Columbia (Waters, 1955). It is superimposed on the Coast rhyolitic flows and pyroclastic rocks some 1,500 m thick. These are Plutonic Complex; the intersection lies mostly in northern younger than some phases of the Chilliwack composite batholith Washington (Fig. 3). and have been considered to be Oligocene in age (Misch, 1966). The granitic plutons are flanked or overlain by various units. The Eocene conglomerate and sandstone occur in patches in a north- Old Settler Schist (Lowes, 1972) in the north and the Darrington trending belt through the middle of the area. They may be correla- Phyllite (Misch, 1966) in the south are among the oldest rock units tive with the Chuckanut Formation of northern Washington in the map-area (Fig. 4). The Old Settler Schist is mainly kyanite (Monger, 1970). and staurolite schist and amphibolite. Along the Chilliwack River, Two major structural features cross the area. In the west, the the Darrington Phyllite is composed mainly of foliated pelite and Chilliwack Group and Cultus Formation are involved in a series of graywacke metamorphosed in the greenschist facies. To the south, thrusts (Fig. 4), among them the Shuksan thrust, and in recumbent the Darrington Phyllite may attain a thickness on the order of folds of middle Cretaceous age (Misch, 1966; Monger, 1966, 3,000 m (Misch, 1966). The age of these two units is uncertain, but 1970). The Fraser River fault zone (Duffell and McTaggart, 1952; they probably predate the Chilliwack Group of late Paleozoic age. Read, 1960; McTaggart and Thompson, 1967; McTaggart, 1970), Rocks of the Chilliwack Group (Fig. 4) underlie large areas west represented in the area by the Hope and Yale faults, extends from of the granitic bodies. The Chilliwack Group (Misch, 1966; the international boundary northward for about 250 km (Fig. 15) Monger, 1966, 1970) is a few thousand metres thick and ranges in and may form part of a major tectonic boundary extending to the age from Early Pennsylvanian to Early Permian. The lower beds Yukon (Price and Douglas, 1972). It extends southward into consist of clastic sedimentary rocks and limestone, and the upper Washington and is probably continuous with the Straight Creek beds are pyroclastic rocks and chert. In the northern part of the fault (Misch, 1966) and the Evergreen fault (Yeats and Engels, area, the Chilliwack assemblage has undergone high-grade regional 1971). The faults are steep, and in the study area a graben may metamorphism (Read, 1960; Lowes, 1972). Rocks of the Triassic- have formed along this zone between the Hope and Yale faults (Fig. Jurassic Cultus Formation, mainly pelite, are associated with the 4), in which Eocene beds accumulated. Strike-slip movement has Chilliwack Group in complex thrusts and folds. The Hozameen been suggested by Misch (1966) and Monger (1970). Group (McTaggart and Thompson, 1967), exposed along the east- ern side of the area, consists of more than 6,000 m of ribbon chert, SPUZZUM INTRUSIONS basic to intermediate lava, limestone, and argillite. Its age is un- known but has been considered to be late Paleozoic or possibly The northern part of the area (Figs. 4, 5) is underlain by diorite Triassic. The Custer Gneiss (McTaggart and Thompson, 1967; and tonalite of the Spuzzum intrusions (McTaggart and Staatz and others, 1972), generally called the "Skagit Gneiss" in Thompson, 1967). These are part of the Spuzzum batholith that ex- tends many kilometres to the north and northwest of the area and U5° forms one of the large plutons of the Coast Plutonic Complex. Two main units are distinguished: a central zoned dioritic complex and a surrounding, probably younger, tonalite. Diorite The diorite is a fresh, medium-grained rock consisting of brown hypersthene (En65) and black augite (Wo45En35Fs20, by optical properties) and (or) hornblende and white, gray, or pink plagio- clase. Biotite is a minor constituent, and quartz is rarely more than 10 percent. K-feldspar is absent in both diorite and tonalite. The rock generally shows an alignment of plagioclase and aggregates of dark minerals that is probably due to flow. In thin section the rock shows little sign of cataclasis. The diorite complex is crudely zoned, with hypersthene-augite diorite (rarely norite) in its core regions and hypersthene- hornblende diorite (rarely tonalite) at its margin. The mineralogical variation appears continuous, but three varieties have been defined: hypersthene-augite diorite in two core regions; an intermediate zone of augite-hypersthene-hornblende diorite; and a marginal zone of biotite-hypersthene-hornblende diorite. Only small chemi- cal differences accompany the pronounced mineralogical variation (Fig. 6, Table 1; sample locations are shown in Richards, 1971). Plagioclase and augite decrease markedly in abundance from the core to the margin as quartz and hornblende increase. Hypersthene abundance is nearly constant, although it is progressively replaced from the core to the margin by a fibrous mineral (anthophyllite?) and colorless pargasitic hornblende. Much of the increase in am- phibole can be accounted for by replacement of augite, but large Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/87/6/935/3429356/i0016-7606-87-6-935.pdf by guest on 01 October 2021 a * r t.
Load more

Recommended publications
  • Hypersthene Syenite and Related Rocks of the Blue Ridge Region, Virginia1
    BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA V o l. 27, pp. 193-234 June 1, 1916 HYPERSTHENE SYENITE AND RELATED ROCKS OF THE BLUE RIDGE REGION, VIRGINIA1 BY THOMAS L. WATSON AND JUSTUS H. CLINE (Presented before the Society December 29, 191k) CONTENTS Page Introduction.................................................................................................................. 194 Previous geologic work............................................................................................. 196 Quartz-bearing hypersthene-andesine syenite...................................................... 197 Distribution.......................................................................................................... 197 Megascopic character......................................................................................... 198 Microscopic character........................................................................................ 199 Chemical composition and classification...................................................... 202 Comparison with quartz monzonite.............................................................. 204 Origin and application of name............................................................. 204 Chemical composition................................................................................ 205 Comparison with akerite.................................................................................. 206 Comparison with syenite (andesine anorthosite) of Nelson County, Virginia.............................................................................................................
    [Show full text]
  • Geochemistry of the Catheart Mountain Porphyry Copper Deposit, Maine
    Maine Geological S urvey Studies in Maine Geology: Volume 4 1989 Geochemistry of the Catheart Mountain Porphyry Copper Deposit, Maine Robert A. Ayuso U.S. Geological Survey Reston, Virginia 22092 ABSTRACT The Ordovician Catheart Mountain pluton is the best example ofa porphyry copper system in the New England Appalachians. It intrudes the Ordovician Attean quartz monzonite in the Proterozoic Chain Lakes massif. The pluton consists of equigranular granodiorite intruded by porphyritic dikes of granite and granodiorite which contain up to 4% sulfides (pyrite, chalcopyrite, and molybdenite). The equigranular host rocks and the porphyritic dikes are generally chemically similar, showing scattered compositional variations which reflect changes imposed on the pluton during crystallization and hydrothermal alteration. Most rocks are hydrated, containing high C02 and high S. The most intensely altered parts of the pluton are potassic (up to 6.9 wt % KiO) and highly mineralized, especially with Cu (up to 3900 ppm), but also with Mo (up to 320 ppm). The host granodiorite and porphyritic dikes are depleted in Ca, Na, Fe2+ and Sr as a function of increasing Cu; the sulfide-rich rocks are enriched in Rb and they have high Fe3+/Fe2+, K/Na, and Rb/Sr values. Abundances and ratios of the highly-charged cations (e.g. Zr, Hf, Ta, and Th) in the Catheart Mountain pluton resemble those in the Devonian granodiorites in the northern Maine plutonic belt. Abundances and ratios of the highly-charged cations in the Sally Mountain pluton, a nearby body also containing Cu and Mo mineralization, differ significantly from those in the Catheart Mountain pluton suggesting that the two plutons are not comagmatic.
    [Show full text]
  • Geologic Section of the Black Range at Kingston, New Mexico
    BULLETIN 33 Geologic Section of the Black Range at Kingston, New Mexico BY FREDERICK J. KUELLMER Structure and stratigraphy of the Black Range, detailed petrology of igneous rocks, and general guides to ore exploration 1954 STATE BUREAU OF MINES AND MINERAL RESOURCES NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY CAMPUS STATION SOCORRO, NEW MEXICO NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY E. J. Workman, President STATE BUREAU OF MINES AND MINERAL RESOURCES Eugene Callaghan, Director THE REGENTS MEMBERS EX OFFICIO The Honorable Edwin L. Mechem ..............................Governor of New Mexico Tom Wiley ................................................ Superintendent of Public Instruction APPOINTED MEMBERS Robert W. Botts .............................................................................. Albuquerque Holm O. Bursum, Jr ................................................................................ Socorro Thomas M. Cramer ...............................................................................Carlsbad Frank C. DiLuzio .............................................................................Los Alamos A. A. Kemnitz ...........................................................................................Hobbs Contents Page ABSTRACT ......................................................... …………………………………… 1 INTRODUCTION ........................................................................................................3 ACKNOWLEDGMENTS .............................................................................................4
    [Show full text]
  • Preliminary Geologic Map of the Mount Baker 30- by 60-Minute Quadrangle, Washington
    U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY Preliminary Geologic Map of the Mount Baker 30- by 60-Minute Quadrangle, Washington by R.W. Tabor1 , R.A. Haugerud2, D.B. Booth3, and E.H. Brown4 Prepared in cooperation with the Washington State Department of Natural Resources, Division of Geology and Earth Resources, Olympia, Washington, 98504 OPEN FILE REPORT 94-403 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. iu.S.G.S., Menlo Park, California 94025 2U.S.G.S., University of Washington, AJ-20, Seattle, Washington 98195 3SWMD, King County Department of Public Works, Seattle, Washington, 98104 ^Department of Geology, Western Washington University, Bellingham, Washington 98225 INTRODUCTION The Mount Baker 30- by 60-minute quadrangle encompasses rocks and structures that represent the essence of North Cascade geology. The quadrangle is mostly rugged and remote and includes much of the North Cascade National Park and several dedicated Wilderness areas managed by the U.S. Forest Service. Geologic exploration has been slow and difficult. In 1858 George Gibbs (1874) ascended the Skagit River part way to begin the geographic and geologic exploration of the North Cascades. In 1901, Reginald Daly (1912) surveyed the 49th parallel along the Canadian side of the border, and George Smith and Frank Calkins (1904) surveyed the United States' side. Daly's exhaustive report was the first attempt to synthesize what has become an extremely complicated geologic story.
    [Show full text]
  • Chemical and Physical Controls for Base Met Al Deposition in the Cascade Range of Washington
    State of Washington Department of Natural Resources BERT L. COLE, Commissioner of Public Lands DIVISION OF MINES AND GEOLOGY MARSHALL T. HUNTTING, Supervisor Bulletin No. 58 CHEMICAL AND PHYSICAL CONTROLS FOR BASE MET AL DEPOSITION IN THE CASCADE RANGE OF WASHINGTON By ALAN ROBERT GRANT STATE PRINTING PLANT ~ OLYMPIA, WASHINCTON 1969 For safe by Department of Natural Resources, Olympia, Washington. Price $1.50 Errata sheet for Washington Division of Mines and Geology Bulletin 58, Chemical and Physical Controls for Base Metal Deeosition in the Cascade Range of Washington ( By Alan Robert Grant Errors noted in the p-inted text are listed below. The editors regret these and possibly other mistakes in editing. Page 12 Paragraph 5, line 2, "heliocpter" should read helicopter. 14 Paragraph 6, line 6, •programed" should read programmed. 15 Figure 2, 11 Ntesoic" in explanation should read Mesozoic. 19 Paragraph 4, line 7, "authochthonous" should read autochthonous. 22 Paragraph 6, line 4, "extension Ntesozoic 11 should read exten•ioo.o f 1l1e Mesozoic. 22 Paragraph 7, line 1, ''aforemention" should read aforementioned. 25 Paragraph 4, line 7, "Misch" should be changed to Vance. 25 Paragraph 7, line 7, "Totoosh, pluton" should read Totoosh pluton. 26 Paragraph 1, line 4, "classical" should read classic. 32 Paragraph 4, line 1, "alkaline" should be changed to acidic intrusive. 33 Paragraph 1, line 1, "alkaline" should be changed to acidic intrusive. 48 Une 3 of Figure 16 caption, "alkaline" should be changed to acidic intrusive~ 49 Paragraph 3, line 5, "Creasy" should read Creasey. 51 Paragraph 3, line 1, "Creasy II should read Creasey.
    [Show full text]
  • 34. the K-Replacement Origin of the Megacrystal Lower Caribou Creek Granodiorite and the Goat Canyon-Halifax Creeks Quartz Monzo
    1 ISSN 1526-5757 34. The K-replacement origin of the megacrystal Lower Caribou Creek granodiorite and the Goat Canyon-Halifax Creeks quartz monzonite --- modifications of a former tonalite and diorite stock, British Columbia, Canada Lorence G. Collins email: [email protected] February 8, 1999 Introduction About 25 km south of Nakusp and 1 km east of Burton, British Columbia, Canada, is a stock whose western half is the Lower Caribou Creek megacrystal granodiorite and whose eastern half is the Goat Canyon-Halifax Creeks fine- grained quartz monzonite (Fig. 1); Hyndman, 1968). Biotite-hornblende tonalite and diorite are additional facies that occur along the border of the stock. Zoned plagioclase in all these rocks indicates a shallow intrusion and relatively rapid crystallization. This stock was called to my attention by Donald Hyndman because the K-feldspar megacrysts in the granodiorite appeared to be orthoclase whereas the smaller K-feldspar crystals in the fine-grained quartz monzonite were microcline. Subsequently, he loaned me 19 thin sections from his Ph.D thesis study (Hyndman, 1968), and these sections provided a broad representation of the textural and compositional variations in both rock types. Because he indicated that the two granitic facies were gradational to each other, this stock offered an opportunity to study the field and textural relationships across the transitions between the rocks having the two kinds of K-feldspar. Following his loan of thin sections, I visited the area and obtained 44 additional samples (and thin sections) across transitions between the two rock types. Examinations of field relationships and both his and my thin sections provide the basis for the conclusions presented in this article.
    [Show full text]
  • Description of Map Units
    GEOLOGIC MAP OF THE LATIR VOLCANIC FIELD AND ADJACENT AREAS, NORTHERN NEW MEXICO By Peter W. Lipman and John C. Reed, Jr. 1989 DESCRIPTION OF MAP UNITS [Ages for Tertiary igneous rocks are based on potassium-argon (K-Ar) and fission-track (F-T) determinations by H. H. Mehnert and C. W. Naeser (Lipman and others, 1986), except where otherwise noted. Dates on Proterozoic igneous rocks are uranium-lead (U-Pb) determinations on zircon by S. A. Bowring (Bowring and others, 1984, and oral commun., 1985). Volcanic and plutonic rock names are in accord with the IUGS classification system, except that a few volcanic names (such as quartz latite) are used as defined by Lipman (1975) following historic regional usage. The Tertiary igneous rocks, other than the peralkaline rhyolites associated with the Questa caldera, constitute a high-K subalkaline suite similar to those of other Tertiary volcanic fields in the southern Rocky Mountains, but the modifiers called for by some classification schemes have been dropped for brevity: thus, a unit is called andesite, rather than alkali andesite or high-K andesite. Because many units were mapped on the basis of compositional affinities, map symbols were selected to emphasize composition more than geographic identifier: thus, all andesite symbols start with Ta; all quartz latites with Tq, and so forth.] SURFICIAL DEPOSITS ds Mine dumps (Holocene)—In and adjacent to the inactive open pit operation of Union Molycorp. Consist of angular blocks and finer debris, mainly from the Sulphur Gulch pluton Qal Alluvium (Holocene)—Silt, sand, gravel, and peaty material in valley bottoms.
    [Show full text]
  • Geologic Map of Washington - Northwest Quadrant
    GEOLOGIC MAP OF WASHINGTON - NORTHWEST QUADRANT by JOE D. DRAGOVICH, ROBERT L. LOGAN, HENRY W. SCHASSE, TIMOTHY J. WALSH, WILLIAM S. LINGLEY, JR., DAVID K . NORMAN, WENDY J. GERSTEL, THOMAS J. LAPEN, J. ERIC SCHUSTER, AND KAREN D. MEYERS WASHINGTON DIVISION Of GEOLOGY AND EARTH RESOURCES GEOLOGIC MAP GM-50 2002 •• WASHINGTON STATE DEPARTMENTOF 4 r Natural Resources Doug Sutherland· Commissioner of Pubhc Lands Division ol Geology and Earth Resources Ron Telssera, Slate Geologist WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES Ron Teissere, State Geologist David K. Norman, Assistant State Geologist GEOLOGIC MAP OF WASHINGTON­ NORTHWEST QUADRANT by Joe D. Dragovich, Robert L. Logan, Henry W. Schasse, Timothy J. Walsh, William S. Lingley, Jr., David K. Norman, Wendy J. Gerstel, Thomas J. Lapen, J. Eric Schuster, and Karen D. Meyers This publication is dedicated to Rowland W. Tabor, U.S. Geological Survey, retired, in recognition and appreciation of his fundamental contributions to geologic mapping and geologic understanding in the Cascade Range and Olympic Mountains. WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES GEOLOGIC MAP GM-50 2002 Envelope photo: View to the northeast from Hurricane Ridge in the Olympic Mountains across the eastern Strait of Juan de Fuca to the northern Cascade Range. The Dungeness River lowland, capped by late Pleistocene glacial sedi­ ments, is in the center foreground. Holocene Dungeness Spit is in the lower left foreground. Fidalgo Island and Mount Erie, composed of Jurassic intrusive and Jurassic to Cretaceous sedimentary rocks of the Fidalgo Complex, are visible as the first high point of land directly across the strait from Dungeness Spit.
    [Show full text]
  • Porphyry Copper Mineralisation of Western Usa
    The Ishihara Symposium: Granites and Associated Metallogenesis PORPHYRY COPPER MINERALISATION OF WESTERN USA Allan J.R.White VIEPS, The University of Melbourne, Victoria 3010, Australia Porphyry copper deposits of western USA are very large low grade deposits dominated by disseminated Cu mineralisation but commonly with appreciable Mo and Au. Many deposits began as gold camps. Mineralisation is centred on, and mostly within, near surface quartz monzonite intrusions in which there is inner and deeper concentric Mo-rich shells. Mo shells are followed by Cu-rich shells, then pyrite and there may be an outermost Pb-Zn-Ag zone as in the country rock skarns of the Bingham deposit (John 1978). Cu-Mo mineralisation occurs within a “potassic” alteration zone characterised by secondary biotite (e.g. Moore 1978). Extensive outer sericitic (phyllic), argillic and propylitic alteration zones do not necessarily conform to the concentric pattern. Large scale bulk mining of a porphyry deposit was first carried out at Bingham. There is a belt of economic deposits extending from Butte Montana, through Bingham Utah, to Arizona where deposits are most abundant, and New Mexico. This review is based on visits to many deposits along the whole length of the belt and various petrological observations at Butte, Bingham, Bagdad, Miami-Globe and Sierrita. Most deposits are Laramide (approx. 70 Ma), a notable exception being Bingham (40 Ma). The Laramide belt is inboard up to 1200 km from the Pacific coast of the US where there are Recent to Mesozoic subduction related rocks. It is suggested that the Laramide igneous rocks were not formed as a result of subduction but as a result of rifting within the Precambrian basement.
    [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]
  • Chilliwack River - Slesse Creek Area New Westminster Mining Division Southwestern British Columbia
    - GEOLOGICAL and DIAMOND DRILLING ASSESSMENT REPORT on the SOUTH SLESSE LIMESTONE QUARRY CHILLIWACK RIVER - SLESSE CREEK AREA NEW WESTMINSTER MINING DIVISION SOUTHWESTERN BRITISH COLUMBIA Longitude- 12 1”42’3VW/Latitude 49”04’35”N NTS 92H/4E - Permit No. NAN-97-07001 10-94, MX-7-114 Prepared for . Machine 86Fibers Ltd. 600-42nd Avenue, S.E. P.O. Box 1325 ? Calgary, Alberta T2P 2L2 *\ ‘/ ‘ ;T<’ Phone: 403-265--6022, Fax: 403-266-264 A ‘.>.a L“: ;” cz! Prepared by ~.,q ,*y ;:cj ‘2. i:ilic;;y>,&_pi J. T. SHEARER, M.Sc., P.Geo. ,..~,, ,- 3 ,;;> “-.> HOMEGGLD RESOURCES LTD. .#:,~,. ~;;1::%,,i g 2; 2 i” ,, % , $ “3 ,“: #5-2330 Tyner St. “.*_&F s” :;22 Port Coquitlam, B.C. “5r;5 v3c 221 ‘“”,:& (5 - ? Phone/Fax: 604-944-6 102 *” .,.I ix “‘2 %i July 15, 1998 P%e ,$ Fieldwork completed between October 4 8e November 25, 1997 ;z 86 March 24 - June 30,199s 1: P TABLE OF CONTENTS !3fs . LIST OF FIGURES and TABLES ................................................................ SUMMARY .............................................................................................. iii _ INTRODUCTION ....................................................................................... 1 LOCATION and ACCESS ........................................................................... 2 CLAIM STATUS ........................................................................................ 4 _ REGIONAL GEOLOGY.. ............................................................................. 5 PROPERTY GEOLOGY and CaC03 RESOURCES ........................................
    [Show full text]
  • By Thomas P. Miller Open-File Report This Report Is Preliminary and Has
    454 UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY PETROLOGY OF THE PLUTONIC ROCKS OF WEST-CENTRAL ALASKA By Thomas P. Miller Open-file report This report is preliminary and has not been edited or reviewed for conformity with Geological Survey standards GEOLOGY BKANCB TiSCHlUCAL DATA FILE ACKNOWLEDGMENTS This study was part of the U* S* Geological Survey's regional geologic mapping program in Alaska under the direction of William W* Patton, Jr., to whom I am indebted for many helpful discussions and criticisms* Professor Robert H* Corapton was my principal advisor during the study and I offer my sincere thanks for his many suggestions and helpful discussions* Professors William C* Luth and Richard H* Jahns read the manuscript in preliminary form and offered constructive suggestions* I thank Kenneth F. Fox, Jr., for many worthwhile discussions concerning the problems of alkaline rocks* Finally, I am especially grateful to my wife, Shirla, for her encouragement and inspiration throughout the course of this study* iii CONTENTS Page ACKNOWLEDGMENTS ...................... iii LIST OF TABLES ...................... vi LIST OF ILLUSTRATIONS ................... vii ABSTRACT ......................... ix INTRODUCTION ....................... 1 GENERAL REMARKS .................... -1 PREVIOUS WORK ..................... 3 PHYSIOGRAPHY ..................... 5 PLUTONIC ROCKS ...................... 7 CLASSIFICATION ..................... 9 ANALYTICAL DATA .................... 11 GEOLOGIC SETTING AND AGE OF THE PLUTONIC ROCKS .... 12 MID-CRETACEOUS
    [Show full text]