Geology, geochronology and geochemistry of the Saishitang Cu deposit in the East Kunlun Orogenic Belt, NW China

被引:1
作者
Ma, Xiaoping [1 ,2 ,3 ]
Zhao, Yun [4 ,5 ,6 ]
Xue, Chunji [4 ,7 ]
Wang, Xiongfei [4 ]
Chen, Jia [4 ]
Yan, Yu [4 ]
Li, Xuguang [4 ]
Qiu, Mingfeng [4 ]
机构
[1] China Univ Geosci, Key Lab Tecton & Petr Resources, Wuhan, Peoples R China
[2] Xinjiang Bur Geol & Mineral Explorat, Geol Party 1, Changji, Peoples R China
[3] Turpan Jinyuan Min & Met Co LTD, Xinjiang Bur Geol & Mineral Explorat, Tulufan, Peoples R China
[4] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
[5] Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Nat Resources, Beijing, Peoples R China
[6] Nanjing Univ, State Key Lab Mineral Deposits Res, Nanjing, Peoples R China
[7] Qinghai Univ, Geol Engn Dept, Xining, Peoples R China
基金
中国国家自然科学基金;
关键词
major- and trace-element geochemistry; polyphase mineralization; Saishitang Cu deposit; Si-O-Pb isotopic compositions; zircon U-Pb geochronology; OXYGEN-ISOTOPE; ICP-MS; CONSTRAINTS; MOUNTAINS; CHERT; ROCKS; DIAGRAMS; CRITERIA; ELEMENTS; GRANITES;
D O I
10.1002/gj.4420
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Saishitang deposit, located in the eastern part of the Eastern Kunlun Orogenic Belt, NW China, hosts important Cu mineralization. The ore occurs as stratiform bodies in Lower-Middle Triassic siltstone and siliceous rock and as lenticular bodies at the contacts between quartz diorite and marble. The whole-rock geochemistry and Si-O isotopic compositions of the siliceous rocks suggest a sedimentary origin. The quartz diorite has a weighted mean zircon U-Pb age of 215.5 +/- 0.9 Ma. The quartz diorite exhibits high SiO2 (63.91-69.48 wt%), Al2O3 (14.98-17.11 wt%) and Na2O (2.17-4.58 wt%) contents, with A/CNK values of 0.79-1.10, similar to those of calc-alkaline I-type granites. The quartz diorite exhibits weak negative Eu anomalies (delta Eu = 0.80-0.99), enrichment in light rare earth elements, Rb, Ba, K and Pb and depletion in heavy rare earth elements, Nb, Ta, P and Ti. The Pb isotopic compositions suggest that the skarn ore, quartz diorite and host rocks are closely correlated, reflecting a common source. By contrast, the Pb isotopic compositions of sulphide ores hosted within siltstone are heterogeneous, suggesting multiple lower-crustal and upper-mantle sources. By integrating our geological and geochemical data, we propose that the Saishitang deposit was formed by exhalative sedimentary mineralization in a back-arc basin and overprinted by Indosinian skarn mineralization in a post-collision extensional environment.
引用
收藏
页码:2428 / 2442
页数:15
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