Výsledky vyhledávání - "Mark A. Jirsa"

New U–Pb geochronology from Timiskaming-type assemblages in the Shebandowan and Vermilion greenstone belts, Wawa subprovince, Superior Craton: Implications for the Neoarchean development of the southwestern Superior Province

Autor: Harold L. Gibson, Michael A. Hamilton, George J Hudak, Robert W.D. Lodge, Mark A. Jirsa, Greg M. Stott

Publikováno v: Precambrian Research. 235:264-277

Timiskaming-type assemblages in the Wawa–Abitibi terrane of the Superior Craton and other Archean cratons worldwide are important because of their spatial and temporal association with world-class orogenic gold mineralization, especially in the Kir

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bf4cf04e7c154e6cb40fd2089089206d
https://doi.org/10.1016/j.precamres.2013.06.011

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Neoarchean paleoweathering of tonalite and metabasalt: Implications for reconstructions of 2.69Ga early terrestrial ecosystems and paleoatmospheric chemistry

Autor: Don F. Parker, Mark D. Schmitz, Nathan D. Sheldon, Mark A. Jirsa, Steven G. Driese, Minghua Ren, Susan L. Brantley

Publikováno v: Precambrian Research. 189:1-17

Field and laboratory investigations of a 2690.83 Ma (207Pb/206Pb age of Saganaga Tonalite) unconformity exposed in outcrop in northeastern Minnesota, USA, reveal evidence for development of a deep paleoweathering profile with geochemical biosignature

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f78a3f9eefcc9ea5819242a835307ea1
https://doi.org/10.1016/j.precamres.2011.04.003

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Geology of the Biwabik Iron Formation and Duluth Complex

Autor: G.B. Morey, James D. Miller, Mark A. Jirsa

Publikováno v: Regulatory Toxicology and Pharmacology. 52:S5-S10

The Biwabik Iron Formation is a approximately 1.9 billion year-old sequence of iron-rich sedimentary rocks that was metamorphosed at its eastern-most extent by approximately 1.1 billion year-old intrusions of the Duluth Complex. The metamorphic recry

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32e2da533390bcfc7bb2c558789b58ee
https://doi.org/10.1016/j.yrtph.2007.09.009

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Penokean tectonics along a promontory-embayment margin in east-central Minnesota

Autor: V.W. Chandler, Terrence J. Boerboom, Mark A. Jirsa

Publikováno v: Precambrian Research. 157:26-49

Recent geologic investigations in east-central Minnesota have utilized geophysical data, test drilling, and high-resolution geochronologic dating to produce a significantly improved map of a poorly exposed part of the 1880–1830 Ma Penokean orogen.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::37b310771c2dfa853211a959c330ac70
https://doi.org/10.1016/j.precamres.2007.02.009

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Reinterpretation of Paleoproterozoic accretionary boundaries of the north-central United States based on a new aeromagnetic-geologic compilation

Autor: R. Anderson, William F. Cannon, Terrence J. Boerboom, James D. Miller, David A. Schneider, W. R. Van Schmus, V.W. Chandler, Klaus J. Schulz, Daniel Holm, Mark A. Jirsa

Publikováno v: Precambrian Research. 157:71-79

The Paleoproterozoic crust in the north-central U.S. represents intact juvenile terranes accreted to the rifted Archean Superior craton. A new tectonic province map, based on the interpretation of a new aeromagnetic compilation, published geologic ma

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::092ce0a3de967be9e7a52fb154164560
https://doi.org/10.1016/j.precamres.2007.02.023

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The Midway sequence: a Timiskaming-type, pull-apart basin deposit in the western Wawa subprovince, Minnesota

Autor: Mark A. Jirsa

Publikováno v: Canadian Journal of Earth Sciences. 37:1-15

The Midway sequence is an assemblage of subaerially deposited clastic and volcanic rocks that forms a narrow wedge within Neoarchean greenstone of the western Wawa subprovince of the Superior Province. Volcanic conglomerate in the Midway sequence con

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::76184e4120620f0905cbfa197d0fdd0c
https://doi.org/10.1139/e99-111

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