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PubMed
Article by Guo Z
Article by Wang J
Article by Zhang J
Article by Li A
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Geochemistry and petrogenesis of serpentinites in Sulu ultrahigh-pressure metamorphosed belt
GUO Zhai-rong, WANG Jian, ZHANG Jia-jia, LI Ai
College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract: Yangkou in Qingdao and Suoluoshu in Rizhao are the important outcrops of serpentinites in the Sulu ultrahigh-pressure metamorphosed belt. Through systematic analysis of petrogeochemistry, it can be found that serpentinites from Yangkou and Suoluoshu are with high contents of Mg, low ratios of Al2O3/SiO2 and relatively depleted HFSE (Nb,Th,Zr and Hf) and HREE, which illustrate characteristics of the forearc mantle peridotites. It reveals that protoliths of these studied serpentinites are residual mantle peridotites formed from different degrees of partial melting. Estimation from modelling suggests that the partial melting degree is less than 15% for protoliths of Yangkou serpentinites, and 20%~25% for the Suoluoshu serpentinites. Serpentinites are rich in fluid-mobile elements and show no obvious correlation between LREE and HFSE, which indicates that protoliths of studied serpentinites have undergone serpentinization by hydrous fluids released from the subducted slab and formed serpentinites enriched in fluid-mobile elements in the forearc mantle wedge.
Keywords: serpentinite   mantle wedge peridotites   partial melting   fluid-mobile elements   geochemistry  
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DOI: 10.3969/j.issn.1004-5589.2018.02.009
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