东昆仑五龙沟矿集区中三叠世辉绿岩脉的岩石成因:年代学、地球化学特征及其构造意义

doi:10.13278/j.cnki.jjuese.20190068

Abstract

Abstract: Through a LA-ICP-MS U-Pb dating of zircons from four diabase dykes in Wulonggou ore concentrated areas, we found that the most zircons are the inherited zircons. The zircons with the latest age represent those from the magmatic crystallization of diabase veins with an average age of (242.8±2.1) Ma (the Middle Triassic). The four diabase dykes are calc-alkaline -high calc-alkaline with w(SiO₂) range of 42.82%-52.94%,w(Na₂O) range of 1.98%-4.51% and w(K₂O) range of 0.70%-2.04%. V, Cr, Ni and the other trace elements in the four dikes are positively correlated with MgO mass fraction, and the mass fraction is small. This results indicate that the fractional crystallizations of the olivine and pyroxene occurred during the magmatic process. The trace elements are characterized by relatively rich in LILE (Rb, Ba, Eu), LREE, depleted of HFSE, Nb/La is 0.39-0.50, Nb/Ta is 12.16-16.69, and Zr/Hf is 45.82-47.06. These features are quite different from those of the magma derived from the depleted asthenosphere mantle. In conclusion, the Middle Triassic diabase dikes in Wulonggou ore concentrated areas may be derived from the partial melting of the lithospheric mantle, reconstructed by the subduction plate fluids and contaminated by the crust.

Key words: Wulonggou ore concentrated areas, diabase dykes, Middle Triassic, chronology, geochemistry, lithospheric

CLC Number:

P588.124

Cheng Long, Ding Qingfeng, Deng Yuanliang, Song Kai, Zhang Qiang. Petrogenesis of Middle Triassic Diabase Veins in Wulonggou Ore Concentrated Areas Within East Kunlun Orogen: Chronology, Geochemistry and Tectonic Significance[J].Journal of Jilin University(Earth Science Edition), 2019, 49(6): 1628-1648.

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Petrogenesis of Middle Triassic Diabase Veins in Wulonggou Ore Concentrated Areas Within East Kunlun Orogen: Chronology, Geochemistry and Tectonic Significance

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