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

doi:10.1007/s00126-016-0702-8

CORC > 地质与地球物理研究所 > 中国科学院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

	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
	Sun, Yan 1,2; Liu, Jianming 3; Zeng, Qingdong 3; Wang, Jingbin 1; Wang, Yuwang 1; Hu, Ruizhong 2; Zhou, Lingli 3; Wu, Guanbin 3
刊名	MINERALIUM DEPOSITA
	2017-08-01
卷号	52 期号:6 页码:799-821
关键词	Xilamulun Mobelt Baituyingzi porphyry Mo-Cu district U-Pb dating Sr-Nd-Pb isotopes Mo-related granitic complex Geochemistry Editorial handling: T. Bissig
ISSN号	0026-4598
DOI	10.1007/s00126-016-0702-8
文献子类	Article
英文摘要	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).
WOS关键词	ASIAN OROGENIC BELT ; MAGMATIC WATER-CONTENT ; RE-OS AGES ; NORTH CHINA ; U-PB ; TECTONIC IMPLICATIONS ; CONTINENTAL GROWTH ; TRACE-ELEMENTS ; GANGDESE BELT ; ORE-BEARING
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000405602500002
资助机构	National Natural Science Foundation of China(41390443 ; Major State Basic Research Program of China(2013 CB429804 ; 41602102) ; 2014 CB440803) ; National Natural Science Foundation of China(41390443 ; Major State Basic Research Program of China(2013 CB429804 ; 41602102) ; 2014 CB440803) ; National Natural Science Foundation of China(41390443 ; Major State Basic Research Program of China(2013 CB429804 ; 41602102) ; 2014 CB440803) ; National Natural Science Foundation of China(41390443 ; Major State Basic Research Program of China(2013 CB429804 ; 41602102) ; 2014 CB440803)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/42773]
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	Sun, Yan
作者单位	1.Beijing Inst Geol Mineral Resources, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Inst Geochem, Guiyang 550002, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Sun, Yan,Liu, Jianming,Zeng, Qingdong,et al. 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	Sun, Yan.,Liu, Jianming.,Zeng, Qingdong.,Wang, Jingbin.,Wang, Yuwang.,...&Wu, Guanbin.(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	Sun, Yan,et al."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.