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. 中国科学院矿产资源研究重点实验室
Constraints on the age and geodynamic setting of the iron formations and anhydrite Fe-(Ba) deposits in the Bulunkuole Group of the Taxkorgan area, NW China

文献类型：期刊论文

作者Peng, Zidong2,4; Zheng, Mengtian2,5; Wang, Changle2,4; Zhang, Lianchang2,3,4; Fan, Longgang1,4; Tong, Xiaoxue2,3,4
刊名ORE GEOLOGY REVIEWS
出版日期2021-06-01
卷号133页码:20
关键词Early Cambrian Iron formation Anhydrite Fe-(Ba) deposit Geodynamic evolution Bulunkuole Group Taxkorgan area
ISSN号0169-1368
DOI10.1016/j.oregeorev.2021.104121
英文摘要Here we present detailed field observations, zircon U-Pb-Hf isotopes, whole-rock geochemical, and Sm-Nd isotopic data for the volcanic-sedimentary rocks within the Bulunkuole Group (BG) in the Taxkorgan area, northwestern China in order to reveal significant information on the formation age and tectonic setting of the iron formations (IFs) and anhydrite Fe-(Ba) deposits hosted by this group. Exposed rocks in the BG are broadly grouped into three subgroups: the lowermost Subgroup 1 is a bimodal volcanic suit (basalts and dacites) interbedded with IF layers; the overlying Subgroup 2 is a clastic sedimentary sequence hosting abundant anhydrite Fe-(Ba) mineralization; and the uppermost Subgroup 3 is dominated by carbonate rocks. Zircon U-Pb ages provide constraints on the formation age of the BG. Specifically, the bimodal volcanism occurred at similar to 540-521 Ma and the sedimentary rocks deposited after 540 Ma. Basalts from the BG bimodal suit are characterized by slightly enriched LREE patterns and pronounced to insignificant negative Nb anomalies when normalized to primitive mantle compositions. These features are comparable with those of modern N-MORB and back-arc basin basalts. Combined with highly heterogeneous Nd isotopes (epsilon(Nd)(t) = 0.2-4.4), these suggest that their magmatic precursors were derived from partial melting of a depleted mantle modified by slab-derived fluids, and interacted with minor crustal components during ascending. By comparison, the BG dacites display gently sloped to flat LREE patterns with a FII-type felsic affinity and a range of negative to positive epsilon(Nd)(t) values (-5.8 similar to+0.7). They are inferred to be generated by partial melting of the old continental crust at relatively shallow levels with variable addition of juvenile material. The BG clastic sediments were dominated by grey-wacke and arkose. Their diagnostic geochemical features, detrital zircon age spectra, and in situ zircon Hf isotopic data indicate that they were mainly derived from weathering of the early Cambrian felsic rocks. Together, these characteristics above, integrated with previous studies, suggest that the BG and related IFs and anhydrite Fe-(Ba) deposits were formed on an active continental margin (possibly back-arc basin) during the southward subduction of the Proto-Tethys Ocean beneath the Taxkorgan-Tianshuihai Terrane.
WOS关键词KUNLUN OROGENIC BELT ; TRACE-ELEMENT GEOCHEMISTRY ; PB ZIRCON GEOCHRONOLOGY ; BIMODAL VOLCANIC-ROCKS ; PROTO-TETHYS OCEAN ; WESTERN KUNLUN ; GREENSTONE-BELT ; SR-ND ; TECTONIC EVOLUTION ; CONTINENTAL-CRUST
资助项目National Science Foundation of China[U1703242] ; National Science Foundation of China[41902078]
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
语种英语
WOS记录号WOS:000647426500002
出版者ELSEVIER
资助机构National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/101212]  
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_中国科学院地球与行星物理重点实验室
通讯作者Peng, Zidong; Zhang, Lianchang
作者单位1.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
5.Sichuan Inst Land Sci & Technol, Sichuan Ctr Satellite Applicat Technol, Chengdu 610031, Peoples R China
推荐引用方式
GB/T 7714		 Peng, Zidong,Zheng, Mengtian,Wang, Changle,et al. Constraints on the age and geodynamic setting of the iron formations and anhydrite Fe-(Ba) deposits in the Bulunkuole Group of the Taxkorgan area, NW China[J]. ORE GEOLOGY REVIEWS,2021,133:20.
APA Peng, Zidong,Zheng, Mengtian,Wang, Changle,Zhang, Lianchang,Fan, Longgang,&Tong, Xiaoxue.(2021).Constraints on the age and geodynamic setting of the iron formations and anhydrite Fe-(Ba) deposits in the Bulunkuole Group of the Taxkorgan area, NW China.ORE GEOLOGY REVIEWS,133,20.
MLA Peng, Zidong,et al."Constraints on the age and geodynamic setting of the iron formations and anhydrite Fe-(Ba) deposits in the Bulunkuole Group of the Taxkorgan area, NW China".ORE GEOLOGY REVIEWS 133(2021):20.

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。