Metallogeny of Jilong sediment-hosted vein type Cu deposit in the;central part of the 'Sanjiang' belt

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	Metallogeny of Jilong sediment-hosted vein type Cu deposit in the;central part of the 'Sanjiang' belt
	Liu YingChao 4; Yang ZhuSen 1; Tian ShiHong 1; Song YuCai ; Li YuLong 2; Lu ShiYin 2; Zhao ZhiYi 2; Hou ZengQian
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:11 页码:3852-3870
关键词	Sediment-hosted vein type Cu deposit Jilong Cu deposit Characteristics Genesis Yushu 'Sanjiang' orogenic belt Tibetan Plateau
ISSN号	1000-0569
英文摘要	Jilong Cu deposit, located in the Yushu area, Qinghai, which is in the central part of the 'Sanjiang' orogenic belt of the northeastern Tibetan Plateau, has similar mineralization characteristics with the sediment-hosted vein type Cu deposits in the Lanping basin in the southern part of the same belt. A study of this deposit is helpful to the understanding of ore-forming regularity of the regional sediment-hosted vein type Cu mineralization in the belt and also useful for the regional prospecting. Based on detailed field work and systematic thin section observation of ores, the authors indicate that the Cu mineralization in Jilong Cu deposit is produced as quartz-carbonate-sulfide veins and formed along a facies transition between elastic rocks and limestones in the Upper Zaduo Group, Carboniferous. Chalcopyrite, bornite, tennantite and chalcocite are the main ore minerals and quartz and calcite are the main gangue minerals. The Sm-Nd isochrone age of calcite from ore-forming stage is about 34Ma, indicating that the Cu mineralization formed at a regional geological background with active strike slipping faults and potassic magmatic activates. Only LV fluid inclusion rich in liquid occur in main ore-forming stage and it suggests a kind of hydrothermal fluid with middle temperature (230 similar to 250 degrees C) and low salinity (3% similar to 6% NaCleqv). The value of delta DV-SMOW (-154 parts per thousand similar to 80 parts per thousand) is with big fractional distillation and the delta O-18(V-SMOW) (7.72 parts per thousand similar to 10.30 parts per thousand) is with small fractional distillation, together of which indicate the ore fluids derived from magmatic hydrothermal fluid which has undergone degasification in open system. The sus values of hydrothermal fluids in ore-forming stages are in unanimity (3.4 parts per thousand similar to 11.6 parts per thousand), which are with bigger fractional distillation than sulfur from magma. These delta S-34 values indicate reducing sulfur for ores came from thermal sulfate reduction, in which the sulfate belonged to the sulfate trapped in limestone in Carboniferous. The ranges of Pb-206/Pb-204, Pb-207/Pb-204 and Pb-208/Pb-204 of chalcopyrite and calcite in main ore-forming stage are 18.668 similar to 18.707, 15.657 similar to 15.792 and 38.645 similar to 38.873, respectively. They are in unanimity with the Pb isotope composition of Cenozoic potassic igneous rocks in the region, indicating the metal for ores origin from regional potassic magmatic hydrothermal fluids. The moralization model of Jilong sediment-hosted vein type Cu deposit can be explained as followings The strike slipping faults led to regional potassic magmatic activates. The magmatic hydrothermal fluid underwent degasification in open system and formed ore-forming fluid rich in metal. The ore-forming fluid moved along the regional thrust faults and strike-slip faults and finally met sediment strata rich in sulfate. The sulfate in the strata was thermal reduced by organic and produced reduced sulfur. The reduced sulfur mixed with metal in the ore-forming fluid and the sulfide finally precipitated.;By comparing Jilong Cu deposit with sediment-hosted vein type Cu deposits in the Lanping basin in the southern part of 'Sanjiang' belt, the authors found that they are similar in geological background, mineralization geology, characteristics and origin of ore-forming fluid, and origins of sulfur and metals, and finally point out that there may be a 1000km-long sediment-hosted vein type Cu deposit belt in the 'Sanjiang' belt.
学科主题	矿床地质
WOS关键词	ZINC ORE-DEPOSIT ; NEODYMIUM ISOTOPE COMPOSITIONS ; SOUTHERN QINGHAI ; IMPLICATIONS ; ASIAN COLLISION ZONE ; EAST-CENTRAL TIBET ; FLUID INCLUSION ; YUSHU AREA ; FORMING MATERIAL ; COPPER-DEPOSIT ; MINERALIZATION
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000328441300017
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40176]
专题	中国地质调查局发展研究中心
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China. 3.Qinghai Inst Geol Survey, Xining 810012, Peoples R China. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Liu YingChao,Yang ZhuSen,Tian ShiHong,et al. Metallogeny of Jilong sediment-hosted vein type Cu deposit in the;central part of the 'Sanjiang' belt[J]. ACTA PETROLOGICA SINICA,2013,29(11):3852-3870.
APA	Liu YingChao.,Yang ZhuSen.,Tian ShiHong.,Song YuCai.,Li YuLong.,...&Hou ZengQian.(2013).Metallogeny of Jilong sediment-hosted vein type Cu deposit in the;central part of the 'Sanjiang' belt.ACTA PETROLOGICA SINICA,29(11),3852-3870.
MLA	Liu YingChao,et al."Metallogeny of Jilong sediment-hosted vein type Cu deposit in the;central part of the 'Sanjiang' belt".ACTA PETROLOGICA SINICA 29.11(2013):3852-3870.