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The Formation and Evolution of Uvarovite in UHP Serpentinite and Rodingite and its Constraints on chromium Mobility in the Oceanic Subduction Zone

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Acta Geologica Sinica(English Edition) 2021年第5期95卷 1456-1471页

作者： ZHANG Cong SHEN Tingting ZHANG Lifei LIN Congcong ZHANG Zhongwei Qin Xueqing HU Han QIU Tian XIANG Zhenqun ZHANG Jianxin Key Laboratory of Deep-Earth Dynamics of the Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China School of Earth and Space Sciences Peking UniversityBeijing 100871China Comprehensive Exploration Technology Center Shandong Coal Field Geological Survey and Research InstituteJinan 250104China Tianjin Center China Geological SurveyTianjin 300170China

The uvarovite-andradite and uvarovite-andradite-grossular solid-solution series are rare in *** discovery of uvarovite-andradite in serpentinite and rodingite from the ultra-high pressure(UHP)metamorphic belt in southwestern Tianshan provided an opportunity to investigate its behavior in the subduction ***(defined as chromiumgarnet)from serpentinite is homogeneous in a single grain,covering compositions in the uvarovite-andradite solid solution series of Adr_(58-66)Uv_(33-41),with few grossular *** from rodingites contain various Cr_(2)O_(3) contents(1.7-17.9 wt%)and mineral compositions being in the range of Adr_(21-31)Uv_(41-50)Grs_(22-37),Adr_(52-90)Uv_(5-25)Grs_(0-21) and Adr_(19-67)Uv_(3-63)Grs_(13-42).Discontinuous chemical variation of uvarovite from core to rim indicates that uvarovite formed by consuming andradite and chromite,which could provide Ca,Cr,Al and *** signals of water were identified for uvarovite from both serpentinite and rodingite,with high water content in uvarovite from *** high pressure mineral assemblage,as well as the association with perovskite,indicated that the studied uvarovite from serpentinite and rodingite was formed through high pressure metamorphism,during the subduction zone serpentinization and *** alkaline and highly reduced fluids released from serpentinization or rodingitization in the oceanic subduction zone promote the mobility of chromium and enable its long-distance migration.

关键词： uvarovite serpentinite rodingite chromium migration oceanic subduction zone

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