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| 1437–1444 GENESIS OF NATIVE COPPER LODES IN THE KEWEENAW DISTRICT, NORTHERN MICHIGAN: A HYBRID EVOLVED METEORIC... Canada H3C 3A7 Abstract The Keweenaw Peninsula of northern Michigan is well known for early diagenetic...diagenetic sulfide-dominant sediment-hosted stratiform copper mineralization hosted mainly by basal siltstone-shale...Formation in the White Pine district, and later native copper lodes hosted mainly by flow-top breccias and amygdaloidal...stratigraphically lower Portage Lake Volcanics. The native copper mineralization is generally attributed to downdip |
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| WHITE PINE-PRESQUE ISLE STRATIFORM COPPER MINERALIZATION, NORTHERN MICHIGAN Alex C. Brown†13250 rue Acadie...Quebec, Canada H9A 1K9 Abstract Economic stratiform copper mineralization in the fine-grained, carbonaceous...White Pine-Presque Isle mining district, northern Michigan, has long been explained by the essentially vertical...strata from the underlying Copper Harbor Conglomerate aquifer, followed by copper precipitation mainly by...Based on that model, why do lesser amounts of total copper, measured in vertical sections, occur in coarser |
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| Mineralogy of Michigan by E. W. Heinrich updated and revised • by George W. Robinson M By E W~ Hellnr]ch...Museum Michigan Technological University Houghton, Michigan 49931 2004 © MINERALOGY OF MICHIGAN 3 FOREWORD...FOREWORD Michigan has a long and varied geologic history that includes repeated episodes of volcanism...before the first Europeans set foot here. When Michigan became a state in 1837, one of the first actions...and we continue to learn more about them today. Michigan minerals helped to build the state and nation |
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| filling from a basaltic Houghton County lava flow. Small specks of native copper occur as inclusions near the...the surface and between the nodular masses. The Michigan Bicentennial symbol (back cover) incorporates...Survey Division BULLETIN 6 THE MINERALOGY OF MICHIGAN by E. Wm. Heinrich Professor of Mineralogy and...University of Michigan Ann Arhor, Michigan Lansing, Michigan 1976 STATE OF MICHIGAN WILLIAM G. Mrr...State of Michigan CL '48 s.321.6. Printed by Speaker-Hines and Thomas, Inc., Lansing, Michigan. Available |
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| University University Michigan Townsend Drive Drive 1400Townsend 1400 Houghton, Houghton, Michigan Michigan49931-1...J. the Keweenaw Peninsula, Michigan: Institute on Lake Superior Geology Proceedings, Keweenaw Peninsula...Peninsula, Michigan: Institute on Lake Superior Geology Proceedings, 40th 40thAnnual AnnualMeeting, Meeting..."Field Guide to the Geology Geology of the the Keweenaw Keweenaw Annual Institute Institute on on Lake Lake...Lake Superior Superior Geology Peninsula, Michigan" Michigan" (Bornhorst (Bornhorst and others, 1983) for |
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| [DT] Time resolution of geologic events on the Keweenaw Peninsula and implications for development of...Geological Engineering Geology and Geophysics, Michigan Technological University, Houghton, M I 49931...Three flood-type lava flows from the Keweenaw Peninsula in upper Michigan have been precisely dated, using...segregations within two basaltic flows. Ages from the Copper City Flow, near the base of the Portage Lake Volcanics...Portage Lake Volcanics and within the Copper Harbour Conglomerate, is 1087.2 ± 1.6 Ma from analyses of |
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| ESTIMATING THE COPPER DERIVED FROM RED BEDS IN THE SEDIMENT-HOSTED STRATIFORM COPPER DEPOSIT MODEL ALEX...tonnage of copper metal leached from footwall red beds to form sediment-hosted stratiform copper deposits...deposits are based on the amounts of copper at ppm levels that might have been derived from the volume of red...beds underlying given sediment-hosted stratiform copper deposits. That static calculation is replaced here...process-based approach in which the release of copper results from the progressive diagenetic alteration |
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| Survey, National Center-MS 954, Reston, VA 22092, USA (Received October 10, 1990; accepted after revision...1 ) native copper deposits in basalts and interflow sediments; (2) sediment-hosted copper sulfide and...and native copper; (3) copper sulfide veins and lodes hosted by rift-related volcanic and sedimentary rocks;...hydrothermal sulfides occur (i.e., shale-hosted copper sulfides), the source of sulfur was local sedimentary...Survey, National Center--MS 954, Reston, VA 22092, USA. tinent rift system (MRS) of North America is one |
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| 64-66 Supt.of Docs. No.: 119.3:1309 1. Geology-Michigan-Isle Royale National Park-Guide-books. I. Title...Lake Volcanics ______ Rock Harbor-Tobin Harbor area __________ Washington Harbor area_______________ An ancient...ancient alluvial fan the Copper Harbor Conglomerate ________ Tilting and breaking the rocks _____________...minerals of special interest ____________ Native copper widespread but not abundant ____ Chlorastrolite...activities of man in the Lake Superior region. Native copper implements, weapons, and ornaments have been found |
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| GEOCHRONOLOGY OF THE KEWEENAWAN WHITE PINE, MICHIGAN • SAMBHUDAS CHAUDHURI AND GUNTER 8 ROCKS...suites of felsite from the White Pine area of Michigan indicate dates ranging from 978 q- 40 m.y. to...diageneticrather than a syngeneticorigin for the copper sulfide in the basal portion of the NonesuchShale...NonesuchShale. INTRODUCTION T•4E Keweenan peninsulaof Michigan has been an important producer of copperfor more...conglomerates. In the vicinityof White Pine, Ontonagon County,chalcocite and minornativecopperoccurin ,thelower |
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| VOLCANICS (MIDDLE KEWEENAWAN) ON ISLE ROYALE, MICHIGAN Prepared in cooperation with the National Park...Isle Royale, Michigan By N. KING HUBER GEOLOGY OF ISLE ROYALE NATIONAL PARK, MICHIGAN GEOLOGICAL SURVEY...-···-·--· 2 The Portage Lake Volcanics on the Keweenaw Peninsula__ 3 The Portage Lake Volcanics on Isle...--- 13 Scoville Point, Middle Point, and Tobin Harbor Flows -------------------------------- 13 Huginnin...------Correlation between Isle Royale and the Keweenaw Peninsula ----------------------------------- |
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| completely covered by patches of Cretaceous conglomerate and a thick mantle of glacial drift, presenting...soft, low-grade hematite ores, and amphibole magnetite rocks. Adams follows Van Hise and Leith in his...by the leaching of the silica. The amphibole magnetite rocks probably have developed from the anamorphism...stratigraphic succession in the Iron River district of Michigan from the Brule river northward consists of finegrained...by diabase dikes. About 200 feet of slate and conglomerate are exposed on Pilot Knob. The igneous rocks |
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| with a large mass of native copper in the Quincy mine ca. 1918. (Michigan Technological University Archives...of Donald Pearce (1941-1989) The “Copper King” The MICHIGAN COPPER COUNTRY L. W i l s o n New Mexico...t a n l e y J. D y l II Seaman Mineral Museum Michigan Technological University % 1992 T h e M in e...COVER: Native copper crystal group, 13.6 cm, from an unknown mine in the Michigan Copper Country. Richard...Burbank) wrote the classic work on the copper deposits of Michigan in 1929. Photo by Wendell E. Wilson. |
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| Quadrangle, Michigan and Wisconsin Prepared in cooperation with Geological Survey Division, Michigan Department...Assessment of the Iron River 1 ° X 2° Quadrangle, Michigan and Wisconsin By W. F. Cannon GEOLOGICAL SURVEY...in cooperation with Geological Survey Division, Michigan Department of Natural Resources, and Wisconsin...assessment of the Iron River 1° X 2° quadrangle, Michigan and Wisconsin. (Geological Survey circular ; 887)...mineral resources Michigan. 2. Mines and mineral resources Wisconsin. I. Michigan. Geological Survey |
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| information: http://www.tandfonline.com/loi/tigr20 Native Copper Deposits and the Disposal of High-Level Waste Michael...this article: Michael O. Schwartz (1996) Native Copper Deposits and the Disposal of High-Level Waste,...Winsron & Son, Inc. All rights reserved. Native Copper Deposits and the Disposal of High-Level Waste M...containers stored in deep geological repositories. Copper has been seriously considered as a container material...material in several wastedisposal projects. Native copper deposits may serve as natural analogues for a chemically |
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| of the Keweenawan Tholeiitic Lavas of Northern Michigan, U.S.A. by WAYNE T. JOLLY1 and RAYMOND E. SMITH...1971) INTRODUCTION T H E Keweenaw Peninsula of the Superior region, Michigan, contains one of the classic...Portage Lake Lava Series of the Keweenaw Peninsula, northern Michigan, is composed of over 5000 m of tholeiitic...restriction netic m nation | Eagle Harbor__ -A Copper Harbor Jacobsville Fm (sandstone) - » I - J Conglomeratic... Lake Michigan FIG. 1. Generalized geologic map of the Keweenaw Peninsula, northern Michigan, showing |
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| Nowmga, COPPER OF MINERALIZATION THE COPPER AT WHITE STANLEY SOCIETY OF GEOLOGISTS IN HARBOR PINE...PINE, K. No. 1967 THE UPPER 7 PART CONGLOMERATE MICHIGAN HAMILTON CONTENTS PAGE Abstract ......Stratigraphyand mineralizationof the CopperHarbor conglomerate........ Stratigraphy .........................Disseminatedcoppermineralizationin the CopperHarbor conglomerate.. Coppermineralizationand cross-stratification...898 898 899 Heavy mineralsin the copperharbor conglomerate........................ Discussionand summary |
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| SomeCopperSulfideDeposits Near Mount Bohemia,KeweenawCounty, Michigan JAMESM. ROBERTSON Abstract Coppersulfides,in...the Keweenaw Peninsulaof northernMichigan, a district long famousfor its depositsof native copper. The...flow tops,a traditionalmodeof occurrenceof native copper in the region. An andesitedike (or dikes), almost...reconstructed. Previousinvestigations conglomerates. Copper sulfides, in moreinteresting amounts,were discovered...exception of the copper depositsin the basal part of the NonesuchShale at White Pine, Michigan, the sulfidesof |
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| Sedimentary Rock-Hosted Stratiform Copper Deposit, Upper Peninsula, Michigan Theodore J. Bornhorst1,†and William...Mineral Museum, Michigan Technological University, 1404 E. Sharon Avenue, Houghton, Michigan 49931 2 Orvana...located in Gogebic County, Upper Peninsula, Michigan, within the Porcupine Mountains copper district. It was...production projected in the near future. Stratiform copper mineralization is hosted by gray to black shales...and siltstones of the basal Nonesuch Formation. Copper mineralization is overlain by laminated gray siltstones |
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| region underlie parts of Minnesota, Wisconsin, and Michigan, very near the geographic center of the North...of Minnesota, northern Wisconsin, and northern Michigan, very near the geographic center of the North...Minnesota (Morey, 1983a,b), and in Wisconsin and Michigan (Sims and Peterman, 1981, 1983; Sims and others...Sims and others, 1984), and in Dickinson County, northern Michigan (James and others, 1961), older gneisses...1972). Xn the western part of northern Michigan, near the Michigan-Wisconsin boundary, Archean gneiss forms |
 | StĂĽeken, Eva E., Jones, Simon, Raub, Timothy D., Prave, Anthony R., Rose, Catherine V., Linnekogel, Stella, Cloutier, Jonathan (2020) Geochemical fingerprints of seawater in the Late Mesoproterozoic Midcontinent Rift, North America: Life at the marine-land divide. Chemical Geology, 553. 119812pp. doi:10.1016/j.chemgeo.2020.119812 | Journal (article/letter/editorial) |
| saltwater, and by rare cm-thick gypsum in the upper Copper Harbor Formation 1 Journal Pre-proof immediately...demonstrably fluvial rocks in the underlying Copper Harbor Formation and overlying Freda Formation (Fig...also explore previous reports of gypsum in the Copper Harbor Formation (Elmore et al., 1989) to investigate...part of the Copper Harbor formations, including samples proximal to the world-class copper deposit at...Gypsum was found in three drill cores of the Copper Harbor Formation as cm-thick stratiform laminae (Fig |
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| and ultramafic rocks: *Acoje ophiolitic nickel-copper Limassol Forest cobalt-nickel (8c) Podiform chromite...PGE (9) * Syenite-hosted copper-silver-PGE *Synorogenic-synvolcanic nickel-copper (7a) Deposits hosted in...Porphyry-related deposits: *Porphyry copper (17) *Volcanic-hosted copper-arsenic-antimony (22a) Gold-bearing...(25e) Other hydrothermal deposits: *New Rambler copper-gold-PGE Olympic Peninsula-type volcanogenic manganese...Residual or placer deposits: *Quartz-pebble conglomerate uranium-gold (29a) Magmatic deposits: *Bushveld |
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| Copper Deposits in Sedimentary and Volcanogenic Rocks GEOLOGICAL SURVEY PROFESSIONAL PAPER 907-C COVER...rhodochrosite 8. Aluminum ore, bauxite, Georgia 9. Native copper ore, Keweenawan Peninsula, Mich. 10. Porphyry molybdenum...Springs, Colo . 14. Tungsten ore, North Carolina Copper Deposits in Sedimentary and Volcanogenic Rocks...TOURTELOT and JAMES D. VINE GEOLOGY AND RESOURCES OF COPPER DEPOSITS GEOLOGICAL SURVEY PROFESSIONAL PAPER...907-C A geologic appraisal of low-temperature copper deposits formed by syngenetic, diagenetic, and |
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| 28 Geologic Structure East and South of the Keweenaw Fault on the Basis of Geo physical Evidence L...Mountains, which is indicated from the geology of the Keweenaw Peninsula and from recent aeromagnetic data [Hinze...of Lake Superior through the Lower Peninsula of Michigan. Much of the western half of the Lake Superior...major thrust faults, a number of which occur in Michigan and Wisconsin and strike parallel to the axis...strongly folded, in central Minnesota, northern Michigan, and Wisconsin, a pronounced unconformity usually |
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| sediment-hosted copper-richdeposits(e.g., planationsof the Na/K ratios of the fluid inclusions, red-bed copper deposits...Nevertheless,basinalfluidssimilar gible quantities of copper(Sverjensky,1984, 1986). to oil field brinesmayhaveplayedan...the formation of some Cu-rich base metal sulfide Copper-richsediment-hosted depositsare not typwith either...discussedabove. Instead, there is a strong obbetween copper-richdepositsand 1984). The presentpaper is specificallydevotedto...the muchmorereducing conditions(ator belowthe magnetite-hematite buffer) proposedby Sverjensky(1986) for |
