Výsledky vyhledávání - "J. C. Roddick"

Rb-Sr isochron study of the Thorr and Main Donegal Granites, Ireland

Autor: P. J. O'Connor, J. C. Roddick, Alex N. Halliday, M. D. Max, C. B. Long, P. S. Kennan

Publikováno v: Geological Journal. 17:279-295

A Rb-Sr whole-rock isochron study indicates that the entire Donegal granite suite was emplaced into orthotectonic Caledonian (Dalradian) rocks over a short interval during mid-Silurian to earliest-Devonian times. The Thorr pluton, probably the earlie

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::761b363eeae413b12ac6133c17f40963
https://doi.org/10.1002/gj.3350170403

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New insights into the Appalachian Orogen from geology and geochronology along the Cape Ray fault zone, southwest Newfoundland

Autor: J. C. Roddick, Greg R. Dunning, Benoît Dubé, K. Lauzière

Publikováno v: Geological Society of America Bulletin. 108:101-116

Reverse-oblique overthrusting of high-grade Port aux Basques Gneiss over the lower-grade, supracrustal Windsor Point Group along the Cape Ray fault zone occurred during late Silurian to early Devonian time and is attributed to major oblique collision

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::85fa2bf6bc77b21d03e5f7c2c1de830a
https://doi.org/10.1130/0016-7606(1996)108<0101:niitao>2.3.co

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Temporal Association of Ductile Deformation and Granitic Plutonism: Rb-Sr and $$^{40}Ar-^{39}Ar$$ Isotopic Evidence from Roof Pendants above the Central Bohemian Pluton, Czech Republic

Autor: J. Košler, D. R. Bowes, G. Rogers, J. C. Roddick

Publikováno v: The Journal of Geology. 103:711-717

The Stare Sedlo gneiss complex occurs as a roof pendant in the early Carboniferous Central Bohemian Pluton. Mylonitic tonalitic gneiss and amphibolite in the complex share a common foliation, which is discordant to the margins of the granitoid masses

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b186d4bc69bf86f59affa79fbc5147e4
https://doi.org/10.1086/629790

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Nd, Sr, Pb, Ar, and 0 isotopic systematics of Sturgeon Lake kimberlite, Saskatchewan, Canada: constraints on emplacement age, alteration, and source composition

Autor: Ernst Hegner, L. Hulbert, J. C. Roddick, S. M. Fortier

Publikováno v: Contributions to Mineralogy and Petrology. 120:212-222

Rb-Sr isotopic dating of phlogopite megacryst samples separated from Sturgeon Lake kimberlite, Saskatchewan, yields a crystallization age of 98±1 Ma (2 σ, MSWD=1.2; 87Sr/86Sr(t)=0.7059). The 40Ar/39Ar analyses of a phlogopite megacryst sample indic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d727ab5b26cd9fad572ba0c09fe20aa3
https://doi.org/10.1007/bf00287118

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40Ar/39Ar dating of white micas from the epidote to the omphacite zones, northern New Caledonia: tectonic implications

Autor: E. D. Ghent, P. M. Black, J. C. Roddick

Publikováno v: Canadian Journal of Earth Sciences. 31:995-1001

An 40Ar/39Ar study of white micas from high-pressure metamorphic rocks of northern New Caledonia yielded cooling ages of 37 ± 1 Ma for both epidote and omphacite zone samples. Whole-rock samples from the lawsonite zone yielded ages in the range 44�

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5f15c1dafa0f657f51ea5a892da5418c
https://doi.org/10.1139/e94-088

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Eocene age for Ag–Pb–Zn–Au vein and replacement deposits of the Kokanee Range, southeastern British Columbia

Autor: Georges Beaudoin, D. F. Sangster, J. C. Roddick

Publikováno v: Canadian Journal of Earth Sciences. 29:3-14

The Ag–Pb–Zn–Au vein and replacement deposits of the Kokanee Range, southeastern British Columbia, are hosted by the Middle Jurassic Nelson batholith and surrounding Cambrian to Triassic metasedimentary rocks in the hanging wall of the transcru

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4580fa4587dab96ae52af783a7a8307f
https://doi.org/10.1139/e92-002

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Implications of U–Pb and K–Ar geochronology for petrogenesis and cooling history of the McGerrigle Mountains plutonic complex, Gaspé, Quebec

Autor: J. C. Roddick, J. B. Whalen, J. K. Mortensen

Publikováno v: Canadian Journal of Earth Sciences. 28:754-761

The high-level McGerrigle Mountains plutonic complex consists of a compositionally diverse (gabbro to granite) hybrid suite at its northern end and a relatively homogeneous granite suite in its southern half. Field and geochemical evidence support fo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bf18f683f0e9aa95e51201467737571a
https://doi.org/10.1139/e91-065

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Petrogenesis and paleotectonic history of the Wild Bight Group, an Ordovician rifted island arc in central Newfoundland

Autor: George A. Jenner, Brian J. Fryer, Jan Hertogen, J. C. Roddick, H. Scott Swinden

Publikováno v: Contributions to Mineralogy and Petrology. 105:219-241

The Wild Bight Group (WBG) is a sequence of early and middle Ordovician volcanic, subvolcanic and epiclastic rocks, part of the Dunnage Tectonostratigraphic Zone of the Newfoundland Appalachians. A detailed geochemical and Nd-isotopic study of the vo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d2002402174447f8ebca545349508a5a
https://doi.org/10.1007/bf00678987

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