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

doi:10.1002/gj.3289

	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
	Zhou, Tiancheng 1,2,3,5; Zeng, Qingdong 1,2,3; Chen, Peiwen 1,2,3; Li, Xiangzi 4; Cen, Chaozheng 4; Yang, Yueheng 1,2
刊名	GEOLOGICAL JOURNAL
	2019-07
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
DOI	10.1002/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.
资助项目	National Natural Science Foundation of China[41390443]
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
WOS研究方向	Geology
语种	英语
出版者	WILEY
WOS记录号	WOS:000477016000019
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/24574]
专题	自然资源部第一海洋研究所
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.