Inversion of Rare Earth Element (REE) in the Lithosphere in Jiyang Depression

Abstract

Abstract: This paper presents a discusion of t.he dynamic process of Mz-Cz lithosphere in Jiyang depression of Bohai Bay basin by llsing REE inversion method based on classical theory of water-free melting mantle rock. The result shows abnormal high temperature of mantle is closely related to activity of continental mantle thermal plume that ascends since late Mz till Cz (Ek) and descends since N. Also, it is proved by calcu-lated magma original depth representing the depth of Lop of asthenosphere tlhat the upwelling of asthenosphere takes place with the thinning of lithosphere, hence, tbe thickness of lithosphere in Mz-Cz interface and before Jiyang movement (Es₃) assumes thinning trend, So do the litho-sphere thickness during Es₃ to Dongying movement (ES₃) and the overall lithosphere thickness since Eg to present.

Key words: Jiyang depression, Mesozoie, Cenozoic, mantle, rare earth element (REE), inversion

CLC Number:

ZHANG Da-gang, SHI Bu-qing, ZHOU Yao-qi. Inversion of Rare Earth Element (REE) in the Lithosphere in Jiyang Depression[J]. Xinjiang Petroleum Geology, 2004, 25(4): 365-367.

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Inversion of Rare Earth Element (REE) in the Lithosphere in Jiyang Depression

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