When Did the Emeishan Mantle Plume Activity Start? Geochronological and Geochemical Evidence from Ultramafic-Mafic Dikes in Southwestern China
Abstract
SHRIMP zircon U-Pb dating of an ultramafic-mafic dike intruded into Lower Devonian limestones from southwestern China gives a mean 238U/206Pb age of 262 ±3 Ma (n = 12, MEWD = 5.7). This is the oldest age hitherto reported for the Emeishan large igneous province (ELIP). These and related dikes have OIB-like trace-element signatures (e.g., low LILE/HFSE, LREE/HFSE, and Zr/Nb ratios) and strong geochemical and Sr-Nd isotopic similarities to the...
Paper Details
Title
When Did the Emeishan Mantle Plume Activity Start? Geochronological and Geochemical Evidence from Ultramafic-Mafic Dikes in Southwestern China
Published Date
Mar 1, 2004
Journal
Volume
46
Issue
3
Pages
226 - 234
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