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	Lead isotopic composition and lead source of the huogeqi cu-pb-zn deposit, inner mongolia, china
	Zhu Xiaoqing; Zhang Qian; He Yuliang; Zhu Chaohui
刊名	Acta geologica sinica-english edition
	2006-08-01
卷号	80期号:4页码:528-539
关键词	Pb isotopic composition Ore lead source Huogeqi cu-pb-zn deposit Inner mongolia
ISSN号	1000-9515
通讯作者	Zhu xiaoqing(zhuxqcas@sohu.com)
英文摘要	The huogeqi orefield located on the northern side of mt. langshan, inner mongolia occurs in the middle proterozoic langshan group metamorphic rocks, and the orebodies are stratiform. in the past twenty years, many chinese geologists have conducted researches on the huogeqi cu-pb-zn deposit, but there has been still a controversy on its origin. some advocate that the deposit is of sedimentary-metamorphic reworking origin, some hold that it is of sea-floor sedex origin, and others have a preference for magmatic superimposition origin. the crux of the controversy is that there is no common understanding about the source of ore-forming materials. in this paper, the pb isotopic compositions of regional achaean-early proterozoic basement rocks, various types of sedimentary-metamorphic rocks and volcanic rocks in the mining district, late proterozoic and hercynian magmatic rocks are introduced and compared with the ore-lead composition, so as to constrain the source of the ore lead. the result indicates that (1) sulfides in the ores have homogeneous pb isotopic compositions, showing a narrow variation range. their pb-206/pb-204 ratios are within a range of 17.027-17.317; pb-207/pb-204 ratios, 15.451-15.786 and pb-208/pb-204 ratios, 36.747-37.669; (2) the pb isotopic compositions of the regional achaean-early proterozoic basement rocks are characteristic of the old pb isotopic composition at the early-stage evolution of the earth, which varies over a wider range, reflecting significant differences in pb isotopic compositions of the ores. all this indicates that the source of ore lead has no bearing on the basement rocks; (3) the sedimentary-metamorphic rocks in the mining district are characterized by highly variable and more radiogenic ph isotopic compositions and their pb isotopic ratios are obviously higher than those of ores, demonstrating that ore lead did not result from metamorphic reworking of these rocks; (4) ph isotopic compositions of late proterozoic diorite-gabbro and hercynian granite are higher than those of ores. meanwhile, the pb isotopic compositions of sulfides in the small-sized strata-penetrating mineralized veinlets formed at later stages are completely consistent with that of sulfides in stratiform-banded ores, suggesting that these veinlets are the product of autochthonous reworking of the stratiform-banded ores during the period of metamorphism and the late magmatic superimposition-mineralization can be excluded; (5) amphibolite, whose protolith is basic volcanic rocks, has the same ph isotopic compositions as ores, implying that ore lead was derived probably from basic volcanism. so, the source of ore-forming materials for the huogeqi deposit is like that of the volcanic massive sulfide (vms) deposits. however, the orebodies do not occur directly within the volcanic rocks, and instead they overlie the volcanic rocks, showing some differences from those typical vms-type deposits.
WOS关键词	BROKEN-HILL ; SOUTH-AUSTRALIA ; WILLYAMA SUPERGROUP ; FLUID INCLUSIONS ; OLARY-BLOCK ; HYC DEPOSIT ; ROCKS ; MINERALIZATION ; MODEL ; BELT
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
语种	英语
出版者	GEOLOGICAL SOC CHINA
WOS记录号	WOS:000240249700009
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2379705
专题	中国科学院大学
通讯作者	Zhu Xiaoqing
作者单位	1.Chinese Acad Sci, Inst Geochem, Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Zhu Xiaoqing,Zhang Qian,He Yuliang,et al. Lead isotopic composition and lead source of the huogeqi cu-pb-zn deposit, inner mongolia, china[J]. Acta geologica sinica-english edition,2006,80(4):528-539.
APA	Zhu Xiaoqing,Zhang Qian,He Yuliang,&Zhu Chaohui.(2006).Lead isotopic composition and lead source of the huogeqi cu-pb-zn deposit, inner mongolia, china.Acta geologica sinica-english edition,80(4),528-539.
MLA	Zhu Xiaoqing,et al."Lead isotopic composition and lead source of the huogeqi cu-pb-zn deposit, inner mongolia, china".Acta geologica sinica-english edition 80.4(2006):528-539.

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