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Brighan Young University Geology Studies GEOLOGY I YOUNG STUDIES f UNIVERSITY Volume 12 December 1965 r' r' CONTENTS Thrusting in the Southern Wasatch Mountains, Utah ........ Michael J. Brady 3 Nebo Overthrust, Southern Wasatch Mountains, Utah ........ B. Allen Black 55 Paleoecologic implications of Strontium, Calcium, and Magnesium in Jurassic rocks near Thistle, Utah .... Button W. Bordine 91 Paleoecology of the Twin Creek Limestone In the Thistle, Utah area .................................... .... .....Ladell R. Bullock 121 Geolo of the Stockton stock and related intmsives, &1e County, Utah ................................................. John L. Lufkin 149 Stratigraphy and rifera of Ordovician rocks near Columbia Iceads, Jasper National Park, Alberta, Canada .............................................................. .. .... J. Keith Rigby 165 Lower Ordovician conodonts and other microfossils from the Columbia Icefields Section, Alberta, Canada ........................... .. .......... R. L. Ethington and D. L. Clark 185 Publications and maps of the Geology Department ........................... .. ..... 207 Brigham Young University Geology Studies Volume 12 - December 1965 Contents Thrusting in the Southern Wasatch Mountains, Utah ........ Michael J. Brady 3 Nebo Overthrust, Southern Wasatch Mountains, Utah ........ B. Allen Black 55 Paleoecologic irriplications of Strontium, Calcium, and Magnesium in Jurassic rocks near Thistle, Utah .... Burton W. Bordine 91 Paleoecology of the Twin Creek Limestone in the Thistle, Utah area .................................................... Ladell R. Bullock 121 Geology of the Stockton stock and related intrusives, Tooele County, Utah .................................................... John L. Lufkin 149 Stratigraphy and porifera of Ordovician rocks near Columbia Icefields, Jasper National Park, Alberta, . Canada .......................................................................... J. Kelth Rlgby 165 Lower Ordovician conodonts and other microfossils from the Columbia Icefields Section, Alberta, Canada ............................................ R. L. Ethington and D. L. Clark 185 Publications and maps of the Geology Department ........................................ 207 A publication of the Department of Geology Brlgham Young University Provo, Utah 84601 Ed~tor J. Keith Rigby Editorial Staff Lehi F. Hintze Myron G. Best Brzgham Your~gUniuerszty Geology Studres is published annually by the Department. Geology Studies consists of graduate student and staff research in the Department and occasional papers from other contributors, and is the successor to BYU Research Studies, Geology Serier, published in separate numbers from 1954 to 1960. Distributed December 31, 1965 Prrce $4.00 Geology of the Stockton Stock and Related Intrusives, Tooele County, Utah* JOHN L. LUFKIN Deparment of Geology, Western Mtchigan Urrrvers~ly,Kalamazoo, Mrrhrgan ABSTRACT.-TheStockton Stock and related intrusives were mapped in an area approxi- mately six square m~les,along the north wall of Soldier Canyon, in the west-central part cf the Oquirrh Mountains, Tooele County, Utah Samples were collected to determine mineralogy, method of emplacement, and metamorphic effects on Intruded formations. The Stockton Stock 1s a porphyritic adamellite intrusive that has invaded the lower Oquirrh Format~on. Related ~ntrus~vesinclude hypabyssal dikes and sills that are hypocrystalline and intermediate in composition. A bleached metamorphic aureole surrounds the stock and includes, in part, two facies of contact metamorphism: albite.ep~dotehornfels and hornblende-hornfels. Mining aaivlty flour~shedin nearby areas during the late 1800's and early 1900's. but how much ore was obtained from mlnes in this area 1s not known. Rush Valley District, adjacent to the mapped area, probably did not exceed $10,000,000 in total prcduct~on The economic future of the distr~ctdoes not appear to be great, due to the shallow nature of lntrusives, low rank metamorphism, and past hlstory of mining production. CONTENTS TEXT Economlc Geology ............................... 163 page Development and History ............ 163 Acknowledgments ................................ 149 References Clted ................................ 164 Introduction ........................................ 150 Stratigraphy ........................................ 151 1I.LUSTRATIONS General Statement ............................ 151 f ~gure Page M~ss~ss~ppianSystem ........................ 151 1. Index map ................................ 151 Great Blue Limestone ................ 151 Mississippian-Pennsylvanian System 154 plate Page Mannlng Canyon Shale ................ 154 1. Geologic map .................... 152-153 Pennsyl\-anian System .................... 154 2. Soldier Canyon Oquirrh Formation ................... 154 ...................... following page 160 Quaternary System ............................ 155 3. Sill Outcrops Structure ................................................ 155 ........................ following page 160 Igneous Rocks .................................... 155 4. Photomicrographs of Adamel- General Statement ........................... 155 I~te,contact zone of Stockton Stockton Stock ............................... 155 Stock ................ following page 160 Petrology .................................... 157 5. Photomicrographs of contact Sills .................................................... 157 zonc Stockton Stock and dior~te Dikes ................................................ 159 s~ll.................... following page 160 Summary of igneous activity ........ 160 table Emplacement .................................... 161 1. Mineral composition of igneous Metamorphism ................................ 161 rocks ............................................ 156 The writer expresses his appreciation to Dr. K. C .Bullock, thesis chairman, who suggested the problem, ass~sted in the field work, and constructively criticized the thesis writing. Thanks are also due to Dr. H. J. Bissell, who 'A thesls submrtted to the Faculty of the Department of Geology, Bngham Young Un~verslty In partla1 fulfillment of the requ~rementsfor the degree of Master of Sr~enre 150 JOHN L. LUFKIN supplied the aerial photographs; Burt Bordine, for helping measure sections, and Dr. Wm. Revell Phillips, who helped with the petrographic work. INTRODUCTION In the early 1900's, most workers in the Oquirrh Mountains were con- cerned with mining activities centered around Mercur and Ophir Canyons and the famous Bingham porphyry copper deposits to the northeast. The first reconnaissance mapping in the thesis area was probably done by Paige of the U.S. Geological Servey in 1925. Gilluly (1932) continued Paige's work in 1926, publishing a geologic map of the Stockton-Fairfield Quadrangles on a topographic base of 1 :31, 250 scale. More recently, the area has been studied from a stratigraphic-paleoecologic standpoint. Moyle (1958) completed a thesis on paleoecology of the Manning Canyon Shale, measuring and describing the section exposed at the mouth of Soldier Canyon. Tooker and Roberts (1961a, b) have worked out the strati- graphy and structural geology immediately to the north. The thesis area constitutes the north half of Soldier Canyon, a prominent drainage on the west flank of the Oquirrh Mountains in west-central Utah (Text-fig. 1). This includes parts of Secs. 26-29, 32-35, T. 4 S., R. 4 W., in the northeast corner of the Stockton Quadrangle-. (Plates 1 and 2). The town of stockton, approximately four and one-half miles. northwest of the mouth of Soldier Canyon, is accessible both from the north and the south, via State Highways 36 and 73. The road leading from Stockton into Soldier Canyon is mainly an unimproved gravel road, which crosses Soldier Creek near the mouth of the canyon. The Stockton Stock and related intrusive bodies are located in the west- central Oquirrh Mountains (Plate 1). This mountain range trends north- south, rising steeply from Rush and Tooele Valleys on the west and Cedar and Salt Lake Valleys on the east. Gilbert (1890), Tooker and Roberts (1961b) have described a fault which borders the range on the west, thus associating this range with other fault-block mountains in the Basin and Range Province (Spurr, 1901) . Field work was done intermittently during the summer of 1964. The main concern of the writer was with the igneous and metamorphic rocks, which were mapped on an aerial photo base map, enlarged to a scale of 1"-1100'. Laboratory work included thin-sectioning collected samples and petro- graphic analyses, with the aid of a Universal Stage. Johannsen's (1931) System was followed, with minor deviations, in the classification of the igneous rocks. Under the heading of "Hypabyssal Rocks of Family 6"/7" ", Johannsen (1931, p. 310) states: "Corresponding to the porphyries, aplites, and pegmatite5 or normal granites, there are similar rocks belonging to the suite of the adarnellites, and called quartz-monzonites or adamellite-porphyries, -aplites and -pegmatites. In the present classification they ;\re not separated from the granitic and granodioritic hypabyssals, where they belong." The writer believes that since the bulk of the mapped igneous rocks are hypabyssal, porphyritic, and related to the Stockton Stock (an adamellite pluton), Families 6" and 7" of Johannsen's Classification should be referred to, although the letter "H" (hypabyssal) will be substituted, rather than the standard "E" (extrusive), or "P" (plutonic) notation. Thus, a STOCKTON STOCK 151 TEXT-FIGURE1.-Index
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