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The formation of the Caosiyao giant porphyry Mo deposit on the northern margin of the North China Craton: Constraints from U?Pb and Re?Os geochronology, whole-rock geochemistry, Hf isotopes, and oxygen fugacity of the magma

文献类型：期刊论文

作者Zhou, Tiancheng1,2,3,5; Zeng, Qingdong1,2,3; Chen, Peiwen1,2,3; Li, Xiangzi4; Cen, Chaozheng4; Yang, Yueheng1,2
刊名GEOLOGICAL JOURNAL
出版日期2019-07-01
卷号54期号:4页码:2160-2184
关键词Caosiyao giant Mo deposit North China Craton whole-rock and isotope geochemistry zircon Ce4+ Ce3+ zircon U?Pb dating
ISSN号0072-1050
DOI10.1002/gj.3289
英文摘要The Caosiyao giant porphyry Mo deposit (1.76 Mt), which is the third largest such deposit in China, is located on the northern margin of the North China Craton and associated with the Caosiyao intrusive complex that was emplaced in Archaean metamorphic rocks. The intrusive complex consists of monzogranite and coarse-, medium-, and fine-grained granite porphyries that yield U?Pb ages of 148.5 +/- 1.2, 146.4 +/- 1.0, 144.6 +/- 1.0, and 142.8 +/- 3.2 Ma, respectively. Four molybdenite Re?Os model ages range from 143.1 +/- 2.4 to 145.3 +/- 2.1 Ma, which are consistent with the U?Pb ages for the igneous complex. The geochronological data indicate that the multistage magmatic-hydrothermal processes were important in the formation of the Caosiyao giant deposit. The rocks of the Caosiyao granitic complex have high contents of silica (SiO2 = 71.7-75.6 wt.%) and total alkalis (mostly K2O + Na2O > 8 wt.%), low contents of CaO and MgO, and exhibit peraluminous high-K calc-alkaline to shoshonitic affinities. They are enriched in large-ion lithophile elements (e.g., K, Rb, U, and Th) and light REEs and depleted in Eu, Ba, Sr, Nb, P, and Ti. The geochemical characteristics indicate advanced fractional crystallization and that the rocks are strongly fractionated I-type granites. The negative Hf isotopic compositions of the granitic rocks, combined with old two-stage Hf model ages, indicate the magmas were derived from partial melting of the ancient lower crust of the North China Craton. All the intrusive rocks in the complex have relatively high Ce4+/Ce3+ ratios and oxygen fugacity, which would have facilitated Mo extraction into the melts owing to the much higher solubility of S as sulphate (SO42-) than sulphide (S2-). The magma crystallization temperatures decreased from 882 degrees C to 770 degrees C as the magma evolved. The multistage magmatic-hydrothermal processes, and the prolonged fractional crystallization, combined with high magma oxygen fugacity are the key factors to form the Caosiyao giant Mo deposit. The tectonic setting of deposit formation was one of extension related to rollback of the subducting Palaeo-Pacific Plate during the Late Jurassic to Early Cretaceous.
WOS关键词ASIAN OROGENIC BELT ; TRACE-ELEMENT DATA ; U-PB ISOTOPE ; INNER-MONGOLIA ; MOLYBDENUM DEPOSIT ; OXIDATION-STATE ; LU-HF ; OS AGES ; ZIRCON ; EVOLUTION
资助项目National Key Research and Development Program of China[2017YFC0601306] ; National Natural Science Foundation of China[41390443]
WOS研究方向Geology
语种英语
WOS记录号WOS:000477016000019
出版者WILEY
资助机构National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/92955]  
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
通讯作者Zeng, Qingdong
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.2 Geoexplorat Party Henan Bur Geoexplorat & Miner, Xuchang, Peoples R China
5.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao, Shandong, Peoples R China
推荐引用方式
GB/T 7714		 Zhou, Tiancheng,Zeng, Qingdong,Chen, Peiwen,et al. The formation of the Caosiyao giant porphyry Mo deposit on the northern margin of the North China Craton: Constraints from U?Pb and Re?Os geochronology, whole-rock geochemistry, Hf isotopes, and oxygen fugacity of the magma[J]. GEOLOGICAL JOURNAL,2019,54(4):2160-2184.
APA Zhou, Tiancheng,Zeng, Qingdong,Chen, Peiwen,Li, Xiangzi,Cen, Chaozheng,&Yang, Yueheng.(2019).The formation of the Caosiyao giant porphyry Mo deposit on the northern margin of the North China Craton: Constraints from U?Pb and Re?Os geochronology, whole-rock geochemistry, Hf isotopes, and oxygen fugacity of the magma.GEOLOGICAL JOURNAL,54(4),2160-2184.
MLA Zhou, Tiancheng,et al."The formation of the Caosiyao giant porphyry Mo deposit on the northern margin of the North China Craton: Constraints from U?Pb and Re?Os geochronology, whole-rock geochemistry, Hf isotopes, and oxygen fugacity of the magma".GEOLOGICAL JOURNAL 54.4(2019):2160-2184.

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