2011•Global geologyRequires access

Geochemical characteristics and tectonic setting of cumulate gabbro in Erlongshan Tree Farm in Xiaoxing'anling

Y Zhao

Abstract

The major,trace and REE element testings of the gabbro in Erlongshan Tree Farm in northern Xiaoxing'anling showed that: the gabbro in the Farm belonged to calc-alkaline series and metaluminous rocks with δEu positive anomaly,and Sr element enriched obviously with the characteristics of cumulate gabbro.The characteristics of Rb/Sr,Nb/Ta,LILE/HFSE,Th/Ta,Nb/U and Nb/La ratios showed that the gabbro magma came from the mantle source metasomatized by subduction fluid.The characteristics of Nb/Zr,Th/Nb,Th/Ta and Ta/Hf ratios and the Th/Hf-Ta/Hf tectonic setting discrimination diagram showed that the gabbro in Erlongshan formed in continental extension environment.

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Key concepts: Gabbro, Lile, Geology, Geochemistry, Subduction, Mantle (geology), Mantle plume, Petrology