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High-grade iron ore deposits of the Mesabi Range, Minnesota; product of a continental-scale Proterozoic ground-water flow system

Autor: G. B. Morey

Publikováno v: Economic Geology. 94:133-142

The Mesabi Range along the north edge of the Paleoproterozoic Penokean orogen in northern Minnesota has produced 3.6 billion metric tons of ore since its discovery in 1890. Of that amount, 2.3 billion metric tons were extracted from hematite-or goeth

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::49f58ccd592ac61d6feaa083345fb3e3
https://doi.org/10.2113/gsecongeo.94.1.133

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Newton Horace Winchell, The George Armstrong Custer Expedition of 1874, and the 'Discovery' of Gold in the Black Hills, Dakota Territory, U.S.A

Autor: G. B. Morey

Publikováno v: Earth Sciences History. 18:78-90

Rumors circulated for years about the fabulous wealth to be found in the Black Hills, an area in Dakota Territory, U.S.A., ceded to the Sioux Nation in 1868. Although the Sioux Nation was determined to keep all outsiders out, the U.S. government deci

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8d9d621a6087f77c1f0d29af2caab497
https://doi.org/10.17704/eshi.18.1.t0281688171970mk

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Element distribution patterns in the Ordovician Galena Group, southeastern Minnesota; indicators of fluid flow and provenance of terrigenous material

Autor: J.H. Mossler, R. S. Lively, G. B. Morey

Publikováno v: Economic Geology. 92:351-359

As part of a regional geochemical investigation of lower Paleozoic strata in the Hollandale embayment of southeastern Minnesota, elemental concentrations in acid-insoluble residues were determined for carbonate rock in the Middle Ordovician Galena Gr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0504f28c3f7693cd55b21b7e483ed25b
https://doi.org/10.2113/gsecongeo.92.3.351

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U – Th – Pb zircon ages of some Keweenawan Supergroup rocks from the south shore of Lake Superior

Autor: William F. Cannon, Robert E. Zartman, G. B. Morey, Suzanne W. Nicholson

Publikováno v: Canadian Journal of Earth Sciences. 34:549-561

New single-crystal zircon U–Th–Pb ages for plutonic and rhyolitic Keweenawan Supergroup rocks from the south shore of Lake Superior provide geochronological constraints on magmatic evolution associated with the 1.1 Ga Midcontinent rift. Analyses

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d1a7cf699f595d1797a1dfeb6e4fa13b
https://doi.org/10.1139/e17-044

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Allostratigraphic relationships of early Proterozoic iron-formations in the Lake Superior region

Autor: D. L. Southwick, G. B. Morey

Publikováno v: Economic Geology. 90:1983-1993

Early Proterozoic sequences in the Lake Superior region, which are sedimentologically related and contain major units of iron-formation, are divisible into allostratigraphic sequences--packages of rock bounded by unconformities. Analysis that emphasi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f2318321906a8f9ab9f774b0e7ce0251
https://doi.org/10.2113/gsecongeo.90.7.1983

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