Mineralization, Geochemistry and Zircon U-Pb Ages of the Paodaoling Porphyry Gold Deposit in the Guichi Region, Lower Yangtze Metallogenic Belt, Eastern China

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	Mineralization, Geochemistry and Zircon U-Pb Ages of the Paodaoling Porphyry Gold Deposit in the Guichi Region, Lower Yangtze Metallogenic Belt, Eastern China
	DUAN Liu'an ; YANG Xiaoyong ; DENG Jianghong ; WANG Fangyue ; LEE Insung
发表期刊	Acta Geologica Sinica(English Edition)
ISSN	1000-9515
	2018-04-15
出版年	2018
卷号	v.92 期号:02 页码:286-312
文献类型	CNKI期刊论文
摘要	The newly discovered Paodaoling porphyry Au deposit from the Guichi region, Lower Yangtze River Metallogenic Belt(LYRB), contains >35 tons of Au at an average grade of ~1.7 g/t. It is a porphyry ‘Au-only' deposit, as revealed by current exploration in the depths, mostly above-400 m, which is quite uncommon among coeval porphyry mineralization along the LYRB. Additionally, there are also Cu-Au bearing porphyries and barren alkaline granitoids in the Paodaoling district. Zircon LA-ICP-MS U-Pb dating of the Cu-Au-bearing porphyries yield an age of 141–140 Ma, falling within the main magmatic stage of the LYRB, whereas the barren granites give an age of 125–120 Ma, coeval with the regional Atype granites. The Cu-Au-bearing porphyries are LILE-, LREE-enriched and HFSE-depleted, typical of arc magmatic affinities. The barren granites are HFSE-enriched, with lower LREE/HREE ratios and pronounced negative Eu anomalies. The Cu-Au-bearing porphyries in the Paodaoling district have high oxygen fugacities and high water content. Pyrite sulfur isotopes of the Paodaoling gold deposit indicate a magmatic-sedimentary mixed source for the ore-forming fluids. Based on the alteration and poly-metal zonation of the deepest exploration drill hole from the Paodaoling Au deposit, we propose that Cu ore bodies could lie at depth beneath the current Au ore bodies. The magmatism and associated Cu-Au mineralization of the Paodaoling district are likely to have formed in a subduction setting, during slab rollback of the paleo-Pacific plate.
关键词	zircon U-Pb dating porphyry Au deposit Lower Yangtze River metallogenic belt(LYRB) Paodaoling paleo-Pacific plate subduction
CNKI专辑号	A;B;
CNKI专辑名称	基础科学;工程科技Ⅰ辑;
CNKI专题号	A011;B021;
CNKI专题名称	地质学;矿业工程;
分类号	P618.51
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	supported by the National Key R&D Program of China(No.2016YFC0600404) ; the National Natural Science Foundation of China(Grant Nos.41673040 and 41611540339) ; the Project of National Land Resource Science and Technology of Anhui Province(2014-K-4)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/188966
专题	中国科学院海洋研究所
作者单位	1.CASKeyLaboratoryofCrust-MantleMaterialsandEnvironments,UniversityofScienceandTechnologyofChina 2.InstituteofGeologyandGeophysics,ChineseAcademyofSciences 3.No.7GoldGeologicalPartyoftheChinesePeople'sArmedPoliceForce 4.LaboratoryforMarineMineralResources,QingdaoNationalLaboratoryforMarineScienceandTechnology 5.CenterofDeepSeaResearch,InstituteofOceanography,ChineseAcademyofSciences 6.SchoolofResourcesandEnvironmentalEngineering,HefeiUniversityofTechnology 7.SchoolofEarthandEnvironmentalSciences,SeoulNationalUniversity
推荐引用方式 GB/T 7714	DUAN Liu'an,YANG Xiaoyong,DENG Jianghong,et al. Mineralization, Geochemistry and Zircon U-Pb Ages of the Paodaoling Porphyry Gold Deposit in the Guichi Region, Lower Yangtze Metallogenic Belt, Eastern China. 2018.