中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 岩石圈演化国家重点实验室
Oxygen isotope heterogeneity of olivine crystals in orogenic peridotites from Songshugou, North Qinling Orogen: Petrogenesis and geodynamic implications

文献类型：期刊论文

作者Yu, Hong1,2; Zhang, Hong-Fu3,4; Zou, Haibo5; Xu, Ji-Feng1,2
刊名AMERICAN MINERALOGIST
出版日期2022-05-25
卷号107期号:5页码:904-913
关键词Oxygen isotope heterogeneity olivine orthopyroxene Songshugou peridotites North Qinling Orogen
ISSN号0003-004X
DOI10.2138/am-2022-7990
英文摘要Olivine grains from Songshugou mylonitized peridotite massif record delta O-18 both lower and higher than in pristine mantle samples in North Qinling Orogen, Central China. Olivines from dunites exhibit large variations in delta O-18 (4.03-7.07 parts per thousand), and some porphyroclasts display negative correlations between delta O-18 and forsterite content {Fo; [100xMg/(Mg+Fe2+)]}. The porphyroclast cores have low-delta O-18 values, indicating that they formed in the oceanic lithospheric mantle prior to subduction. We attribute low-delta O-18 values to seawater-peridotite interaction under high-temperature conditions. The porphyroclast rims and small olivines exhibit high-delta O-18 values. These features suggest that high-delta O-18 olivines formed during mylonitization in the exhumation process. Olivines reacted with O-18-rich melt/fluids released from subducted altered oceanic basalts and continental sediments at low temperature (<610-680 degrees C). The O-18-rich melt/fluids selectively affected porphyroclast rims and small olivine grains. Unlike the olivines in the dunites, the olivines and orthopyroxenes in the harzburgites show limited variations in delta O-18 (4.21-5.45 parts per thousand and 5.5-5.8 parts per thousand, respectively), due to orthopyroxene exchange with melt/fluid at a slower rate than the coexisting olivine. The preservation of the low-delta O-18 signature in olivines indicates a short residence time (<20 Ma) for subducting peridotites to mantle depths.
WOS关键词PRESSURE METAMORPHIC ROCKS ; LOW-O-18 SILICIC MAGMAS ; LOW DELTA-O-18 ; OCEANIC-CRUST ; TECTONIC EVOLUTION ; CENTRAL CHINA ; SAMAIL OPHIOLITE ; HYDROGEN ISOTOPE ; MANTLE SOURCES ; TRIPLE OXYGEN
资助项目National Key Research and Development Project of China[2019YFA0708603] ; National Natural Science Foundation of China[41603037]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000790666400012
出版者MINERALOGICAL SOC AMER
资助机构National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/105163]  
专题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Yu, Hong
作者单位1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
5.Auburn Univ, Dept Geosci, Auburn, AL 36849 USA
推荐引用方式
GB/T 7714		 Yu, Hong,Zhang, Hong-Fu,Zou, Haibo,et al. Oxygen isotope heterogeneity of olivine crystals in orogenic peridotites from Songshugou, North Qinling Orogen: Petrogenesis and geodynamic implications[J]. AMERICAN MINERALOGIST,2022,107(5):904-913.
APA Yu, Hong,Zhang, Hong-Fu,Zou, Haibo,&Xu, Ji-Feng.(2022).Oxygen isotope heterogeneity of olivine crystals in orogenic peridotites from Songshugou, North Qinling Orogen: Petrogenesis and geodynamic implications.AMERICAN MINERALOGIST,107(5),904-913.
MLA Yu, Hong,et al."Oxygen isotope heterogeneity of olivine crystals in orogenic peridotites from Songshugou, North Qinling Orogen: Petrogenesis and geodynamic implications".AMERICAN MINERALOGIST 107.5(2022):904-913.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。