 | | Journal (article/letter/editorial) | | g e conglornero t e .... @ Quincy mine @ Allouez no. 3 shaft Other detailed sections . I N D E...GEOI.OGIC M A P O F SOME PEGMATITIC LAVA FLOWS, MICHIGAN C O P P E R D I S T R I C T Downloaded from https://pubs...SERIES AND THE ORIGIN OF THE COPPER DEPOSITS OF MICHIGAN By HENRY R. CORNWALL ABSTRACT Five lava flows...flows in the Keweenawan series of the Michigan copper district have been studied and chemical analyses made...comparison of the types of rocks found within a single flow with the types of flows that make up the lava series; |  | | Report (issue) | | (CaBSiO4OH) vesicle filling from a basaltic Houghton County lava flow. Small specks of native copper occur as inclusions...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 |  | | Journal (article/letter/editorial) | | APRIL 30, 1935 DIFFERENTIATION IN LAVAS OF THE MICHIGAN KEWEENAWAN * B Y T . M . BBO DEBICK (Bead before................................... 505 Keweenawan flow, Wisconsin...................................................................... 506 Cape Spencer flow, N ova Scotia...................................................................... 509 The Greenstone flow .......................................................................... 510 The Kearsarge flow................................................ |  | | Book | | 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 |  | | Report (issue) | | 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...15 Minong Flow ------------------------------------------------ 15 Amygdaloid Island Flow --------------·-------------...------- C18 Greenstone Flow-------------------------------------·--- 19 Hill Point Flow ------------ |  | | Report (issue) | | o· THE GEOLOGY OF COOK COUNTY, MINNESOTA Wave-built gravel bar damming mouth of small stream west...SCHWARTZ, DIRECTOR BULLETIN 39 The Geology of Cook County Minnesota BY FRANK F. GROUT ROBERT P. SHARP GEORGE...BY THOMAS ALLEN, LTD., TORONTO FOREWORD Cook County forms the extreme northeastern part of Minnesota...long narrow parallel lakes. The position of the county on the north shore of the largest fresh-water lake...types of agriculture. As a consequence most of the county is still forested, a considerable proportion belonging |  | | Journal (article/letter/editorial) | | minor elementa in ma& Keweenawan lava-flowe of the Michigan copper dietrid, on the month shore of Lake l ...units in one flow; (3) eight copper-bearing and barren conglomeratea and amygddoidal flow-tape. A total...of individual aampk+6 of 86ven units in the Greenstone flow, and a total of forty-five mineral sampI= were...addition, twenty-seven earnplea of eix amygdaloidal flow-topa and two conglomerates, thirteen containing...aleo investigated the Green&one flow, and, in addition, the Copper City flow. At the place where it was sampled |  | | Report (issue) | | associated rhyolitic rocks, Idaho -------------Greenstone Flow, Michigan ---------------Hypabyssal (diabase) provinces...central Arizona --------------Bullfrog district, Nye County, Nev ____________ _ The Mother Lode, California...Butte Quartz Monzonite, Butte district, Silver Bow County, Mont-----------------------------------------...Distribution of gold and copper in the Greenstone Flow of the Michigan copper district ---------------Distribution...of gold in Precambrian diabase intrusions, Iron County, Mo _____________________________ _ Distribution |  | | Journal (article/letter/editorial) | | however, contain a minor greenstone flow series. A less metamorphosed greenstone series is also present...work both years. The study of the geology of the township was a part of a larger project supported by funds...area falls into four major categories; (1) The greenstone or volcanic complex commonly called Keewatin...material injected into and associated with the greenstone, and 764 F. J . PETTIJOHN----“ COUTCHICHING”...Basic intrusives (in part contemporaneous with greenstone flows) Metadiorite, metadiabase, soapstone Abram |  | | Report (volume) | | Highway 49 (Skyway Road) near town of Abel, Cleburne County. Absaroka Supergroup/Volcanic Supergroup U ABRK03...volcanic field, Yellowstone National Park, Park County, Wyo. Academy Church Shale Member (Springer Formation)...W1/2NW1/4NE1/4SE1/4 sec. 1, T. 3 s., R. 2 E., Carter County. Adams Formation ADMS01 1. Holocene 2. Alaska (SE)...Quadrangle, lat 45° N., long 70°50'-55' W., Oxford County. Adamstown Member (Frederick Limestone) U ADMS06...section W of Lime Kiln in Frederick Valley, Frederick County. Named for town of Adamstown. Adobe Town Member |  | | Journal (article/letter/editorial) | | lesser amounts of plagioclase, either andesine or labradorite, and diopside. Sphene, ilmenite, magnetite and...Mercarar Grid: B-72-113Tholeiite flow M V N V 570120 B-72-I t4 Tholcrrtc flow 20V N V 5701 20. l3-72-1I f...f Olivlne-tholeiite flow 20V N V 568119 B-72-120Tholeiite flow 20V NV 5hPII9 B-72-118OIivine-tholeiltoflow...ow 2OV N V 568118 B-73-146Tholeiite flow 8-72-115 Tholelfte flow n-7>1 I6 Olivine-thnleiiteRow 20V TVV...TVV 5691 19 &72-119 Tholtiilt flow 20V N V 5671 18 B-73-147Tholei~teflow 'Determined by X-ray fluorescence |  | | Report (issue) | | ........... . Keewatin Group ......... . Ely Greenstone ......... . Soudan Iron-Formation Laurentian...Districts .... _ Wisconsin ................. _ Michigan .................. . .5. SOUTHWESTERN l\ | | Journal (article/letter/editorial) | | microscopically in slides from the basal part of another flow. Bartrum records calcite veins from the type area...a change in the associated plagioclase from labradorite to albite, around the margins of pegmatite veins...transport of the reacting substances; but in a lava flow this function of the "buffer" may be discharged...data, that in the central zone of the Greenstone flow of the Michigan Keweenawan a magma rich in volatiles...place at an early stage (p. 404) and regards the Greenstone rocks as a suitable starting point for study |  | | Report (issue) | | Marquette and Sands Quadrangles Marquette County Michigan GEOLOGICAL SURVEY PROFESSIONAL Prepared...cooperation with the Geological Survey Division of the Michigan Department of Conservation PAPER 397 Geology...Marquette and Sands Quadrangles Marquette County Michigan By JACOB E. GAIR and ROBERT E. THADEN GEOLOGICAL...cooperation with the Geological Survey Division of the Michigan Department of Conservation UNITED STATES GOVERNMENT...map and sections of the Marquette quadrangle, Michigan. Geologic map and sections of the Sands quadrangle |  | | Report (volume) | | Bull. 1060-D, p. 193, 252-253, pl. 7. In Nemaha County, Kans., member is basal unit of Howard limestone...Aarde farm, sec. 4, T. 26 S., R. 11 E., Greenwood County. Aaron Slatet Precambrian or Paleozoic: Central...Hyco quartz porphyry. Varies from nearly pure greenstone to fairly pure argillaceous sandstone and slate;...Central Railroad, sees. 5-7, T. 11 S., R. 5 E., Pope County. Named for Abbott Station. Abbyville Gabbrol Precambrian...map. Occurs in vicinity of Abbyville, Mecklenburg County. Abercrombie Formationl Middle Cambrian: Western |  | | Journal (article/letter/editorial) | | Vincent and B. A. Collett. Leucocratic layer (Labradorite cumulate) of LZa. Uttentals Plateau. III.* 5109...height from 10 to 25 per cent FeO. The FeO in the labradorite cumulate 5109 is 4 per cent, and this is only...average and melanocratic rocks. The TiO2 in the labradorite cumulate is low as it is only present in the...by Cornwall (1951, pp. 157-8) for the Greenstone flow of Michigan, although the intensity of the variation...with in this way. FROM THE COMPOSITION OF A LABRADORITE CUMULATE OF THE LOWER ZONE OF THE LAYERED SERIES |  | | Journal (article/letter/editorial) | | Vincent and B. A. Collett. Leucocratic layer (Labradorite cumulate) of LZa. Uttentals Plateau. III.* 5109...height from 10 to 25 per cent FeO. The FeO in the labradorite cumulate 5109 is 4 per cent, and this is only...average and melanocratic rocks. The TiO2 in the labradorite cumulate is low as it is only present in the...by Cornwall (1951, pp. 157-8) for the Greenstone flow of Michigan, although the intensity of the variation...intercumulus material. From one such rock, a labradorite cumulate of LZa, a composition for the contemporary |  | | Report (issue) | | E . CASKEY, J R . , editors Terrestrial Heat Flow editor Gravity Anomalies: Unsurveyed HYMAN 10...studies are be ing pursued, while new studies of heat flow, magnetics, and conductivity are under way or already... 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 |  | | Report (volume) | | ..... 38 VI. A, Cross section of ellipsoidal greenstone bed near Rocky Point; B, Ellipsoidal greenstones...interbedded with ellipsoidal greenstone. 40 VIII. A, Ellipsoidal greenstone succeeded by conglomerates...district....... 27 4. Relations between ellipsoidal greenstone flows and interbedded sediments...............also adduced to show 7 8 PEEFACE. that the greenstone is not the source of the copper, as has been...places been of minor importance. In general the greenstone has been the most resistant rock, the high i |  | | Journal (article/letter/editorial) | | the following. The plagioclase is typically a labradorite, AnS?, in unzoned crystals, small, well formed...constituents of such rocks are tabular andesine-labradorite, irregular olivine grains, subhedral to ophitic...407 deduced by Cornwall (1951,170) for the Greenstone Flow in the Keweenawan, than that (2 %) suggested...red-brown biotite. An average plagioclase is a labradorite, An63, in tabular crystals showing various degrees...ironoxide and in some rocks orientated, either by flow or by sedimentation. Beautiful double coronas of |  | | Report (volume) | | 5 in., inch or inches. Circ., Circular. Co., County or Company. Indus., Industrial. Inst., Institute...Topographic or Topography. Trans., Transactions. Twp, Township. Twps, Townships. uncon., unconformity or unconformably...places into a schist. Varies from nearly pure greenstone to fairly pure argill. ss. and sl., and in certain...rocks younger than Glenarm series and designated "greenstone volcanics" is stated to include a porphyritic...Pre-Cambrian : Central southern Virginia (Mecklenburg County). F. B. Laney, 1917 (Va. Geol. Surv. Bull. 14, |  | | Book (edition) | | argued about possible courses and directions of flow of tributaries and “ancestral” streams that may...gradient steepens, increasing _ the velocity of stream flow. When this happens, a stream downcuts rapidly, especially...feet per second. Contrast this with the range of flow before dams were built above the Grand Canyon: a...Canyon Dam, brings some sediment, seasonal highwater flow, and occasional flash-flooding to the Grand Canyon...and some of them are intermittent; that is, they flow only during wet seasons. Angels Landing is a typical |  | | Book (edition) | | One Liberty Plaza, 20th Floor, New York, NY 10006, USA 477 Williamstown Road, Port Melbourne, VIC 3207,...Composite Volcanoes, Domes, Calderas, Ash-fall and Ash-flow Deposits 10.3 International Union of Geological...6.1 Laminar and Turbulent Flow 12.6.2 Movement of Particles by Fluid Flow 12.6.3 Movement of Particles...an entire year. Despite its low value, this heat flow is sufficient to make the Earth a dynamic planet...create and destroy rocks. Calculations of the heat flow from the Earth have been performed on more than |
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