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  2. 地质与地球物理研究所
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  4. 岩石圈演化国家重点实验室
Mapping chromite deposits with audio magnetotellurics in the Luobusa ophiolite of southern Tibet

文献类型：期刊论文

作者He, Lanfang1,2,3; Chen, Ling1,4; Dorji5; He, Zhanxiang6; Wang, Xuben7; Xiao, Bayi6; Xu, Ligui6; Zhao, Xuefang8,9; Xi, Xiaolu8,9; Yao, Hongchun8,9
刊名GEOPHYSICS
出版日期2018-03-01
卷号83期号:2页码:B47-B57
ISSN号0016-8033
DOI10.1190/GEO2017-0110.1
英文摘要The exploration of podiform chromites in the Indus Yarlong Zangbo suture zone of southern Tibet has proved difficult because most known deposits pinch out and then reappear in the same direction. Several ground-based geophysical approaches such as gravity, magnetic, and controlled-source audio-frequency magnetotelluric (CSAMT) methods have been applied to explore for these chromite deposits but have mostly failed to delineate prospective areas. We have evaluated a successful podiform chromite exploration case history that is based on AMT. More than 8000 AMT stations were used in this study within a 10 km(2) area of the ophiolite belt. Line separations were 80 or 40 m, and the station separation was 20 m. We implemented Bostick conversion and nonlinear conjugate gradient inversions for data interpretation, whereas 2D resistivity sections and 3D resistivity imaging were used to elucidate the inner structure and distribution of rock faces within the Luobusa ophiolite. Results from rock physics and drilling further indicate that resistivity-anomaly domains from these AMT results are correlated with rock faces in terms of fresh harzburgite, altered harzburgite and dunite, and they can thus be connected to concealed deposits. Therefore, we have developed three resistivity-anomaly models for chromite exploration, and we delineated several prospective regions containing exploitable deposits within the Luobusa ophiolite. Seven of the nine verified bore-holes discussed in this paper intersected with chromite deposits; one comprises the largest and highest grade chromite deposit in China to date. Our AMT results provide the impetus for future chromite exploration in Tibet and enable a refined understanding of the structure and distribution of rock faces within the Luobusa ophiolite.
WOS关键词PODIFORM CHROMITITES ; ULTRAHIGH-PRESSURE ; ORIGIN ; EVOLUTION ; MINERALS ; DUNITES ; COESITE ; HISTORY ; TUNNEL ; MANTLE
资助项目Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB03010800] ; National Natural Science Foundation of China[41774083] ; National Natural Science Foundation of China[41274078] ; Chinese Geological Survey[DD20160193] ; Chinese Geological Survey[12120113095200]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000443595400030
出版者SOC EXPLORATION GEOPHYSICISTS
资助机构Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Geological Survey ; Chinese Geological Survey ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Geological Survey ; Chinese Geological Survey ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Geological Survey ; Chinese Geological Survey ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Geological Survey ; Chinese Geological Survey
源URL[http://ir.iggcas.ac.cn/handle/132A11/88551]  
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He, Lanfang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.CEA, Inst Geophys, Key Lab Seism Observat & Geophys Imaging, Beijing, Peoples R China
3.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing, Jiangsu, Peoples R China
4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
5.Tibet Bur Explorat & Dev Geol & Mineral Resources, Lhasa, Peoples R China
6.China Natl Petr Corp, BGP, Zhuozhou, Peoples R China
7.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu, Sichuan, Peoples R China
8.Cent S Univ, Key Lab Metallogen Predict Nonferrous Met & Geol, Minist Educ, Changsha, Hunan, Peoples R China
9.Cent S Univ, Key Lab Nonferrous Resources & Geol Hazard Detect, Sch Geosci & Infophys, Changsha, Hunan, Peoples R China
推荐引用方式
GB/T 7714		 He, Lanfang,Chen, Ling,Dorji,et al. Mapping chromite deposits with audio magnetotellurics in the Luobusa ophiolite of southern Tibet[J]. GEOPHYSICS,2018,83(2):B47-B57.
APA He, Lanfang.,Chen, Ling.,Dorji.,He, Zhanxiang.,Wang, Xuben.,...&Chen, Rujun.(2018).Mapping chromite deposits with audio magnetotellurics in the Luobusa ophiolite of southern Tibet.GEOPHYSICS,83(2),B47-B57.
MLA He, Lanfang,et al."Mapping chromite deposits with audio magnetotellurics in the Luobusa ophiolite of southern Tibet".GEOPHYSICS 83.2(2018):B47-B57.

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来源：地质与地球物理研究所

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