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Mo-mineralized porphyries are relatively hydrous and differentiated: insights from the Permian-Triassic granitic complex in the Baituyingzi Mo-Cu district, eastern Inner Mongolia, NE China
Yan Sun;  Jianming Liu;  Qingdong Zeng;  Jingbin Wang;  Yuwang Wang;  Ruizhong Hu;  Lingli Zhou;  Guanbin Wu
2017
Source PublicationMineralium Deposita
Volume52Issue:6Pages:799-821
Abstract

Mo-Cu mineralization in the Baituyingzi district of eastern Inner Mongolia occurs within a granitic complex. This paper presents and discusses zircon U-Pb ages and whole-rock geochemical and Sr-Nd-Pb isotopic data from the granitic complex as potential indicators for porphyry Mo fertility. The U-Pb ages indicate that five units of the granitic complex were emplaced between 265.2 +/- 0.7 and 246.5 +/- 1.0 Ma. Constrained by crosscutting dikes, Mo-Cu mineralization was probably related to the Baituyingzi monzogranite porphyry dated at 248.2 +/- 0.64 Ma. The intrusions belong to high-K calc-alkaline to shoshonitic series that are characterized by highly fractionated rare earth element (REE) patterns and strong enrichments of large ion lithophile elements, relative to high-field strength elements. Apart from the similar to 246-Ma dike that shows negative epsilon Nd (t) values (-14.9 to -13.1), the intrusions have epsilon Nd(t) values ranging from -3.9 to 1.0, relatively young depleted mantle model ages (811 to 1183 Ma), Pb-206/Pb-204 of 18.137-18.335, and Pb-207/Pb-204 of 15.591-15.625, which are consistent with a juvenile lower crustal origin. Among the intrusions, the similar to 248-Ma porphyry and the similar to 246-Ma dike show adakite-like characteristics (e.g., Sr/Y = 44.9-185) and listric-shaped REE patterns that indicate amphibole fractionation and a hydrous magma source. However, the porphyry exhibits a higher differentiation index (81.4-91.5) and a steeper REE profile (e.g., La-N/Yb-N = 25.6-87.0) than those of the similar to 246-Ma dike, which suggests that it is highly differentiated. We propose that the complex was generated by the partial melting of juvenile mafic lower crust (containing minor old crustal relicts) that was triggered by collision between the North China Craton and Siberian Craton. As indicated by the Th/Nb, Th/Yb, Ba/Th, and Ba/La ratios of the intrusions, the crust may have been derived from the melting of the fertile mantle wedge that was metasomatized by various amounts of slab-derived fluids or melts due to earlier subduction and was heterogeneous in terms of water, Cu, Mo, and S contents and possible oxidation state. The fertility of the porphyry was likely associated with the addition of earlier subduction-related slab melts to the magma source (leading to a hydrous and possible high oxidation state) and the long-time (similar to 20 Ma) collision tectonic setting in which it formed (resulting in a highly differentiated state).

KeywordXilamulun Mo Belt Baituyingzi Porphyry Mo–cu District U–pb Dating Sr–nd–pb Isotopes Mo-related Granitic Complex Geochemistry
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8078
Collection矿床地球化学国家重点实验室
Affiliation1.Beijing Institute of Geology for Mineral Resources, Beijing 100012, China
2.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
3.Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Recommended Citation
GB/T 7714
Yan Sun;Jianming Liu;Qingdong Zeng;Jingbin Wang;Yuwang Wang;Ruizhong Hu;Lingli Zhou;Guanbin Wu. Mo-mineralized porphyries are relatively hydrous and differentiated: insights from the Permian-Triassic granitic complex in the Baituyingzi Mo-Cu district, eastern Inner Mongolia, NE China[J]. Mineralium Deposita,2017,52(6):799-821.
APA Yan Sun;Jianming Liu;Qingdong Zeng;Jingbin Wang;Yuwang Wang;Ruizhong Hu;Lingli Zhou;Guanbin Wu.(2017).Mo-mineralized porphyries are relatively hydrous and differentiated: insights from the Permian-Triassic granitic complex in the Baituyingzi Mo-Cu district, eastern Inner Mongolia, NE China.Mineralium Deposita,52(6),799-821.
MLA Yan Sun;Jianming Liu;Qingdong Zeng;Jingbin Wang;Yuwang Wang;Ruizhong Hu;Lingli Zhou;Guanbin Wu."Mo-mineralized porphyries are relatively hydrous and differentiated: insights from the Permian-Triassic granitic complex in the Baituyingzi Mo-Cu district, eastern Inner Mongolia, NE China".Mineralium Deposita 52.6(2017):799-821.
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