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Neoproterozoic and Early Paleozoic magmatic records from the Chalukou ore district, northern Great Xing'an Range, NE China: Implications for tectonic evolution and Mesozoic Mo mineralization
Li, Zhen-Zhen1; Qin, Ke-Zhang1,2; Li, Guang-Ming1; Jin, Lu-Ying1; Song, Guo-Xue2
2018-10-01
发表期刊JOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
卷号165页码:96-113
摘要To constrain the pre-mineralization tectonic evolutionary history and the nature of the magma source of the Chalukou Mo deposit, which is located on the western margin of the Xing'an block, we recognized and studied period of Neoproterozoic magmatism and a suite of Early Paleozoic volcanic rocks in this ore district. The magmatic zircons of quartz chlorite schist collected from the Wolegen Group yielded a concordant Pb-206/U-238 age of 685.1 +/- 4.5 Ma (MSWD = 0.21), and they show very high epsilon Hf(t) values (+ 15.5 to + 17.3) and young HI modal ages (573-664 Ma) close to the formation age, indicating that the protolith was generated during the Neoproterozoic, and was most likely derived from a depleted mantle region. This Neoproterozoic magmatism might represent an important crustal growth event within the Xing'an Block. The host wallrocks in the Chalukou deposit mainly consist of rhyolite, dacite, andesite and volcanic tuff which have undergone slight deformation and metamorphism. The results of zircon LA-ICP-MS U-Pb dating indicated that they were generated during 472-475 Ma. The results of whole-rock geochemical analysis indicate that they have arc-affinity featuref. characterized by LREE enrichment with moderate to strong fractionation between LREE and HREE (Law Yb-N = 7.7-13.6), intense negative Eu anomalies (delta Eu = 0.36-0.71), pronounced positive Ba, Th, U, Pb and Le anomalies and negative Nb-Ta, P and Ti anomalies. Hf isotopes show various epsilon Hf (t) values ranging from -2.0 tc +5.9 and slightly old two-stage model ages ranging from 1070 Ma to 1573 Ma. Combined with discrimination diagrams, these data indicate that they were derived from the partial melting of a slightly older lower crust with the addition of a juvenile crust component in an active continental margin setting related to the subduction ol the Paleo-Asian Ocean between the Xing'an and Songliao blocks. The existence of Neoproterozoic magmatic activity and Mesoproterozoic lower crustal materials obtained from the Hf model ages of the Paleozoic volcanic rocks in the Chalukou ore district demonstrated that Precambrian basement exists in the Xing'an Block, but it: distribution area may be limited. As the largest porphyry Mo deposit in China, the ore-forming materials might have multiple sources, considering the long-term and multiple magmatic events that occurred under different tectonic settings in the ore district. The previous modification and refertilization of the lower crust and/or lithospheric mantle by the subduction of the Paleo-Asian Ocean might be important in the generation of the fertile lower crust, which is the direct source of the ore-related porphyries.
关键词Xing'an block Chalukou Mo deposit Neoproterozoic Paleozoic volcanic rocks Precambrian basement
DOI10.1016/j.jseaes.2018.06.020
资助者National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project
关键词[WOS]U-PB AGES ; ASIAN OROGENIC BELT ; PORPHYRY CU DEPOSITS ; DA-HINGGAN MOUNTAINS ; INNER-MONGOLIA ; VOLCANIC-ROCKS ; NORTHEASTERN CHINA ; GEOLOGICAL SIGNIFICANCE ; ERGUNA MASSIF ; HF ISOTOPES
语种英语
资助项目National Natural Science Foundation of China Project[41390444] ; National Natural Science Foundation of China Project[41502094] ; National Natural Science Foundation of China Project[41272108]
资助者National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000449447300006
出版者PERGAMON-ELSEVIER SCIENCE LTD
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89440
专题矿产资源研究院重点实验室
通讯作者Li, Zhen-Zhen; Qin, Ke-Zhang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Li, Zhen-Zhen,Qin, Ke-Zhang,Li, Guang-Ming,et al. Neoproterozoic and Early Paleozoic magmatic records from the Chalukou ore district, northern Great Xing'an Range, NE China: Implications for tectonic evolution and Mesozoic Mo mineralization[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,165:96-113.
APA Li, Zhen-Zhen,Qin, Ke-Zhang,Li, Guang-Ming,Jin, Lu-Ying,&Song, Guo-Xue.(2018).Neoproterozoic and Early Paleozoic magmatic records from the Chalukou ore district, northern Great Xing'an Range, NE China: Implications for tectonic evolution and Mesozoic Mo mineralization.JOURNAL OF ASIAN EARTH SCIENCES,165,96-113.
MLA Li, Zhen-Zhen,et al."Neoproterozoic and Early Paleozoic magmatic records from the Chalukou ore district, northern Great Xing'an Range, NE China: Implications for tectonic evolution and Mesozoic Mo mineralization".JOURNAL OF ASIAN EARTH SCIENCES 165(2018):96-113.
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