Petrogenesis of the Flood Basalts Forming the Northern Kerguelen Archipelago: Implications for the Kerguelen Plume

Autor:	Doug Pyle, Dominique Weis, Huai Jen Yang, André Giret, Gilbert Michon, Frederick A. Frey
Rok vydání:	1998
Předmět:	Basalt Isochron geography geography.geographical_feature_category Pleistocene Geochemistry Crust Tectonics Geophysics Geochemistry and Petrology Archipelago Flood basalt Geology Petrogenesis
Zdroj:	Journal of Petrology. 39:711-748
ISSN:	1460-2415 0022-3530
Popis:	The thick, >20 km, crust of the Kerguelen Archipelago formed as the tectonic setting of the Kerguelen Plume changed from an oceanic ridge-centered location at 43 Ma to its present location beneath the Antarctic plate. The uppermost crust is dominantly flood basalt with a thickness of up to 10 km. Inverse isochron 40Ar/39Ar ages for upper and lower lavas in a 630 m section of basalt flows from Mont Bureau are 30.4 and 29.0 Ma; Re-Os isotopic systematics are consistent with this age. Most of the lavas in two stratigraphic sections (Mont Bureau and Mont Rabouillere) from the northern part of the archipelago have Sr, Nd and Pb isotopic characteristics similar to the youngest (Upper Miocene to Pleistocene) lavas erupted in the southeast part of the archipelago, i.e. initial 87Sr/86Sr >0.7050, 143Nd/144Nd 10%) MgO alkalic lavas in the Southeast Province of the archipelago, in these northern sections it is confined to transitional lavas with
Databáze:	OpenAIRE
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