U-Pb ages, geochemical characteristics and their implications of Banlashan molybdenum deposit

	U-Pb ages, geochemical characteristics and their implications of Banlashan molybdenum deposit
	Zhang XiaoJing 1,2; Zhang LianChang 1; Jin XinDi 1; Wu HuaYing 1,2; Xiang Peng 1,2; Chen ZhiGuang 1,2
刊名	ACTA PETROLOGICA SINICA
	2010-05-01
卷号	26 期号:5 页码:1411-1422
关键词	Porphyry molybdenum deposit Granodiorite porphyry Zircon LA-ICP-MS U-Pb dating Petrology geochemistry Hf isotope
ISSN号	1000-0569
文献子类	Article
英文摘要	The Banlashan molybdenum deposit, located in the northern segment of Xilamulun molybdenum metallogenic belt, is a newly found medium porphyry molybdenum deposit. Zircon LA-ICP-MS U-Pb dating gives that ore-forming granodiorite porphyry was emplaced with age of 133. 5 +/- 1. 7Ma. Therefore, the Banlashan molybdenum deposit was formed after 133Ma, in the Early Cretaceous. The wall rock- rhyolite porphyry was emplaced with age of 160 +/- 2Ma, earlier than the ore-forming age 27Ma at least. Hf isotope analyses for the rhyolite porphyry and granodiorite porphyry gives positive epsilon(11f)(t) values, which suggest that the source materials of two types of rocks come from newly accreted crustal materials. Besides the isotope similarity between rhyolite porphyry and granodiorite porphyry, they also resembled in the geochemical features, which is presented by high Al and K contents, low Mg, Ca and TEe contents, belonging to high K and cal-alkaline series; and they are both enriched in LREEs and LILEs, such as Rb, Ba and Th, and depleted in HFSEs, such as Nb, Ta and Zr. However, the main differences between them are that Sigma REE and europium depletion of rhyolite porphyry are higher than those of granodiorite porphyry, and that rhyolite porphyry is low Sr and high Yb (Sr = 37.3 x 10(-6), Yb = 4. 81 x 10(-6)), but granodiorite porphyry is high Sr and low Yb (Sr = 628 x 10(-6), Yb = 1.64 x 10(-6)). All the features mentioned above indicate that rhyolite porphyry is probably derived from medium and upper crust, while granodiorite porphyry is the product of melting thicken lower crust. The source regions of the two types of rocks were deepening during the strong extension of lithosphere.
WOS关键词	NORTH CHINA CRATON ; INNER-MONGOLIA ; HF-ISOTOPE ; METALLOGENIC BELT ; VOLCANIC-ROCKS ; GEOCHRONOLOGY ; MINERALIZATION ; ZIRCONS ; MANTLE ; SR
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000278597800008
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/72473]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang XiaoJing
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Zhang XiaoJing,Zhang LianChang,Jin XinDi,et al. U-Pb ages, geochemical characteristics and their implications of Banlashan molybdenum deposit[J]. ACTA PETROLOGICA SINICA,2010,26(5):1411-1422.
APA	Zhang XiaoJing,Zhang LianChang,Jin XinDi,Wu HuaYing,Xiang Peng,&Chen ZhiGuang.(2010).U-Pb ages, geochemical characteristics and their implications of Banlashan molybdenum deposit.ACTA PETROLOGICA SINICA,26(5),1411-1422.
MLA	Zhang XiaoJing,et al."U-Pb ages, geochemical characteristics and their implications of Banlashan molybdenum deposit".ACTA PETROLOGICA SINICA 26.5(2010):1411-1422.