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  4. 中国科学院矿产资源研究重点实验室
Post-magmatic hydrothermal activities in the Bursa ophiolite (NW Turkey): Implications for unusual minerals recovered from ophiolites

文献类型：期刊论文

作者Liu, Xia4,5; Su, Ben-Xun4,5; Gopon, Phillip3; Xiao, Yan1; Uysal, Ibrahim2
刊名LITHOS
出版日期2023
卷号436-437页码:10
关键词Chromite Hydrothermal fluids Mineral inclusion Carbonation Ophiolite
ISSN号0024-4937
DOI10.1016/j.lithos.2022.106957
英文摘要Low-temperature hydrothermal activities in ophiolites and their modification of chromite have been less studied compared to the magmatic processes. Here we present evidence of hydrothermal modification of chromitites from the mantle sequence of the Bursa ophiolite (NW Turkey). The chromitites are composed mainly of chromite with variable amounts of magnesite and quartz in the matrix. Many chromite grains contain various inclusions such as monophase magnesite or quartz, as well as multi-phase inclusions of quartz + chlorite +/- magnesite associated with or without ferrian chromite, which are unusual in ophiolitic chromitites worldwide. Ferrian chromite intergrown with chlorite and quartz inclusions, has higher Cr# values (88.3-94.1) but lower MgO (6.11-9.74 wt%), and Fe3+/(Fe3++Fe2+) ratios (0.13-0.25) than primary chromite (Cr#: 78.3-79.1); MgO: 15.4-15.6 wt%; Fe3+/(Fe3++Fe2+): 0.36-0.40), indicating the infiltration of reducing and SiO2-rich serpenti-nizing fluids. The pyroxene and olivine were likely broken down by the pre-existing fluids and contributed to the SiO2-rich characteristic of serpentinizing fluid. Fluxing by CO2-rich fluids produced carbonation of the previous serpentine matrix and formed interstitial magnesite and quartz. Lower MgO contents and overall higher Cr# values of small chromite grains hosted in magnesite matrix compared to those hosted in quartz matrix (MgO: 13.2-15.0 wt% vs. 14.8-15.4 wt%; Cr#: 78.7-79.8 vs. 78.2-78.8) suggest that the carbonated fluids redis-tributed Mg2+ into magnesite and subtly increased Cr solubility in the fluids. Recrystallization may have prompted fracture healing in chromite grains and preservation of quartz when not associated with ferrian chromite. The carbon and oxygen isotope compositions of magnesite (813C: -3.35 parts per thousand; 818O: 17.29 parts per thousand) indicate that the CO2-rich fluids were likely derived by decarbonation of marble and metaclastic rocks from the Tavs,anli zone metamorphic rocks in the Bursa ophiolite.
WOS关键词POZANTI-KARSANTI OPHIOLITE ; OMAN OPHIOLITE ; PODIFORM CHROMITITES ; FLUID INCLUSIONS ; PERIDOTITE ; PETROGENESIS ; CARBONATION ; ORHANELI ; GENESIS ; ORIGIN
资助项目Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0801] ; Youth Innovation Promotion Association, Chinese Academy of Sciences
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000899579500002
出版者ELSEVIER
资助机构Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/106949]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Liu, Xia; Su, Ben-Xun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey
3.Univ Leoben, Chair Geol & Econ Geol, A-8700 Leoben, Austria
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Xia,Su, Ben-Xun,Gopon, Phillip,et al. Post-magmatic hydrothermal activities in the Bursa ophiolite (NW Turkey): Implications for unusual minerals recovered from ophiolites[J]. LITHOS,2023,436-437:10.
APA Liu, Xia,Su, Ben-Xun,Gopon, Phillip,Xiao, Yan,&Uysal, Ibrahim.(2023).Post-magmatic hydrothermal activities in the Bursa ophiolite (NW Turkey): Implications for unusual minerals recovered from ophiolites.LITHOS,436-437,10.
MLA Liu, Xia,et al."Post-magmatic hydrothermal activities in the Bursa ophiolite (NW Turkey): Implications for unusual minerals recovered from ophiolites".LITHOS 436-437(2023):10.

入库方式： OAI收割

来源：地质与地球物理研究所

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