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The Mesozoic Caosiyao giant porphyry Mo deposit in Inner Mongolia, North China and Paleo-Pacific subduction-related magmatism in the northern North China Craton

文献类型：期刊论文

作者Wu, Huaying1,2,3; Zhang, Lianchang3; Pirajno, Franco4; Shu, Qihai1; Zhang, Min2; Zhu, Mingtian3; Xiang, Peng1
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2016-09-01
卷号127页码:281-299
关键词Zircon U-Pb dating Molybdenite Re-Os dating Giant porphyry Mo deposit Caosiyao Northern North China Craton Paleo-Pacific subduction
DOI10.1016/j.jseaes.2016.06.014
文献子类Article
英文摘要The Caosiyao giant porphyry Mo deposit is located in the Wulanchabu area of Inner Mongolia, within the northern North China Craton (NCC). It contains more than 2385 Mt of ore with an average grade of 0.075% Mo. In the Caosiyao mining district, Mo mineralization occurs mainly in a Mesozoic granite porphyry as disseminations and stockworks, with some Mo distributed in Archean metamorphic rocks and diabase as stockworks and veins. The host granite porphyry is composed of two different phases that can be distinguished based on mineral assemblages and textures: one phase contains large and abundant phenocrysts (coarse-grained), while the other phase is characterized by fewer and smaller phenocrysts (medium grained). Zircon U-Pb-Hf analyses of the former phase yielded a concordant Pb-206/U-238 age of 149.8 +/- 2.4 Ma with a Pb-206/U-238 weighted mean age of 149.9 +/- 2.4 Ma and epsilon(Hf)(t) values ranging from -12.2 to 18.3, while the latter phase gave a concordant Pb-206/U-238 age of 149.0 +/- 2.2 Ma with a Pb-206/U-238 weighted mean age of 149.0 +/- 2.1 Ma and epsilon(Ht)(t) values ranging from -13.1 to 17.7. Five samples of disseminated molybdenite have a Re-187-Os-187 isochron age of 149.5 +/- 5.3 Ma with a weighted average age of 149.0 +/- 1.8 Ma, whereas six veinlet-type molybdenite samples have a well-constrained Re-187-Os-187 isochron age of 146.9 +/- 3.1 Ma and a weighted average age of 146.5 +/- 0.8 Ma. Thus, it is suggested that the Mo mineralization of the Caosiyao deposit occurred during the Late Jurassic (ca. 147-149 Ma), almost coeval with the emplacement of the host granite porphyry (ca. 149-150 Ma). The host granite porphyry is characterized by high silica (SiO2 = 71.52-74.10 wt%), relatively high levels of oxidation (Fe2O3/FeO = 0.32-0.94 wt%) and high alkali element concentrations (Na2O + K2O = 8.21-8.76 wt%). The host granite porphyry also shows enrichments in U and K, and depletion in Ba, Sr, P, Eu, and Ti, suggesting strong fractional crystallization of plagioclase, biotite, and accessory minerals. These observations, together with high SiO2 contents and a high differentiation index (DI = 89.04-92.44), indicate a strong differentiation of the granite magma.
WOS关键词ZIRCON U-PB ; RE-OS AGES ; LA-ICP-MS ; LU-HF ; METALLOGENIC BELT ; NE CHINA ; GEOCHEMICAL CONSTRAINTS ; GEOLOGICAL SIGNIFICANCE ; ISOTOPE SYSTEMATICS ; MOLYBDENUM DEPOSIT
WOS研究方向Geology
语种英语
WOS记录号WOS:000381323400019
资助机构National Natural Science Foundation of China(41390445 ; National Natural Science Foundation of China(41390445 ; Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences ; 41202063) ; 41202063) ; National Natural Science Foundation of China(41390445 ; National Natural Science Foundation of China(41390445 ; Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences ; Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences ; 41202063) ; 41202063)
源URL[http://ir.iggcas.ac.cn/handle/132A11/53372]  
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
作者单位1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.China Met Geol Bur, Inst Mineral Resources Res, Beijing 100025, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China
4.Univ Western Australia, Ctr Explorat Targeting, 35 Stirling Highway, Crawley 6005, Australia
推荐引用方式
GB/T 7714		 Wu, Huaying,Zhang, Lianchang,Pirajno, Franco,et al. The Mesozoic Caosiyao giant porphyry Mo deposit in Inner Mongolia, North China and Paleo-Pacific subduction-related magmatism in the northern North China Craton[J]. JOURNAL OF ASIAN EARTH SCIENCES,2016,127:281-299.
APA Wu, Huaying.,Zhang, Lianchang.,Pirajno, Franco.,Shu, Qihai.,Zhang, Min.,...&Xiang, Peng.(2016).The Mesozoic Caosiyao giant porphyry Mo deposit in Inner Mongolia, North China and Paleo-Pacific subduction-related magmatism in the northern North China Craton.JOURNAL OF ASIAN EARTH SCIENCES,127,281-299.
MLA Wu, Huaying,et al."The Mesozoic Caosiyao giant porphyry Mo deposit in Inner Mongolia, North China and Paleo-Pacific subduction-related magmatism in the northern North China Craton".JOURNAL OF ASIAN EARTH SCIENCES 127(2016):281-299.

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来源：地质与地球物理研究所

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