中国大陆科学钻探预先导孔(CCSD-PP2)榴闪岩的地球化学组成及其地质意义

戚学祥; 唐哲民; 闫玲

Volume 31 Issue 4

Jul. 2006

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Article Navigation > Earth Science > 2006 > 31(4): 539-550

QI Xue-xiang, TANG Zhe-min, YAN Ling, 2006. Geochemical Characteristics of Garnet-Amphibolite from the Pre-Pilot Hole of the Chinese Continental Scientific Drilling (CCSD-PP2) and Its Geological Significance. Earth Science, 31(4): 539-550.

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Geochemical Characteristics of Garnet-Amphibolite from the Pre-Pilot Hole of the Chinese Continental Scientific Drilling (CCSD-PP2) and Its Geological Significance

Key Laboratory for COmtinental Dynamics of MLR，Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037，China

Received Date: 2006-05-10
Publish Date: 2006-07-25

Abstract

Abstract

The pre-pilot hole of the Chinese Continental Scientific Drilling (CCSD-PP2) is located at the UHP metamorphic supracrustal slice of northern Sulu. The rock types in CCSD-PP2 are garnet-amphibolite (amphibolite), orthogneisses, paragneisses and eclogite. The main mineral assemblage of the garnet-amphibolite from the first part in CCSD-PP2 is amphibole, garnet, biotite and albite, which resulted from retrograde metamorphism. The geochemical data show the chemical compositions of the garnet-amphibolite are consistent with so-called normal eclogite, the compositions and partition pattern of REE from garnet-amphibolote are similar to eclogite from the main hole, and there are some differences in trace element and geochemical discriminating figures between the garnet-amphibolite from CCSD-PP2 and eclogite from the main hole, which demonstrates that their protoliths are within plate basalts, and the differences are caused by the characteristics of the protolith and fluid introduction during eclogite retrograde metamorphism. Coesite and omphacite inclusions in zircons were discovered both from garnet-amphibolite and orthogneiss, closely below the garnet-amphibolite. There is similar petrological and geochemical characteristics between PP2 and main hole orthogneiss. The SiO₂ content in garnet-amphibolite increases gradually toward the contacts with orthogneisses. All the lines of evidence show that the garnet-amphibolite and orthogneisses experienced subduction into the upper mantle and strong retrogressive metamorphism during exhumation, and there were compositional exchanges, to a certain extent, between them.

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References(34)

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