首页|揭示中国东部胶东半岛大尹格庄金(银)矿床中方铅矿记录的异常银富集作用

揭示中国东部胶东半岛大尹格庄金(银)矿床中方铅矿记录的异常银富集作用

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通过对方铅矿结构、地球化学和原位铅同位素的研究,探讨大尹格庄金(银)矿床异常银富集的成因.银富集发生晚于金矿化,出现在大尹格庄矿床南部,主要与陡倾裂隙有关的远端脉状矿石中方铅矿及其出溶的富银硫盐矿物(如硫铋银矿)有关.富银方铅矿有最低的放射性成因铅(206Pb/204Pb 17.195–17.258和208Pb/204Pb 37.706–37.793),表明变质岩石圈地幔或改造的下地壳为铅和银的源区.这两个镁铁质和超镁铁质源区同样被认为是胶东金矿床中金的源区,暗示深部的金属源区对不均一的银富集作用控制并不显著.由于富银部位同时处于招平和大尹格庄断裂的下盘,因此在NE–SW挤压和NW–SE伸展背景下,大尹格庄断裂和招平断裂同时活动产生的局部旋转应力最有可能主导不均一的银富集作用.地壳浅部构造活动通过影响后期成矿流体流动进而控制局部金属异常富集.
Deciphering anomalous Ag enrichment recorded by galena in Dayingezhuang Au(-Ag) deposit, Jiaodong Peninsula, Eastern China
Texture, geochemistry, and in-situ Pb isotope of galena were investigated to probe the origin of anomalous Ag enrichment in the Dayingezhuang Au(-Ag) deposit. Silver enrichment postdates the main Au mineralization and occurs in the south of the Dayingezhuang deposit. It is primarily associated with galena and the exsolution of Ag-rich sulfosalts (e.g., matildite) in distal vein-ores related to steeply dipping brittle fractures. Silver-rich galena is characterized by the least radiogenic Pb isotope signature (206Pb/204Pb 17.195–17.258 and 208Pb/204Pb 37.706–37.793), possibly indicating a metasomatized lithospheric mantle or modified lower crustal source for Pb and Ag. Both of these mafic and ultramafic source regions have been previously suggested as Au reservoirs for other Jiaodong Au deposits, implying that the metal reservoir has only a weak control on the uneven Ag-enrichment. Since the Ag-enrichment areas are located in the footwalls of both the Dayingezhuang and Zhaoping faults, the enrichment was most likely dominated by local rotational stress during coeval movements of the two faults in a NE–SW compression and NW−SE extension regime. This work highlights the shallow-crust structural deformation responsible for controlling the flow of late ore-forming fluid resulting in local anomalous metal enrichment.

galenalead isotopesilverDayingezhuang depositJiaodong Peninsula

刘占坤、毛先成、汪凡云、汤磊、陈光桓、陈进、邓浩

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中南大学 地球科学与信息物理学院 有色金属成矿预测与地质环境监测教育部重点实验室,长沙 410083

Department of Geology, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada

中南大学 出版社,长沙 410083

招金矿业股份有限公司,烟台 265400

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方铅矿 铅同位素 银 大尹格庄矿床 胶东半岛

This work is supported by the National Natural Science Foundation of ChinaThis work is supported by the National Natural Science Foundation of ChinaThis work is supported by the National Natural Science Foundation of ChinaThis work is supported by the National Natural Science Foundation of ChinaNational Key R&D Program of China

420308094177234941972309420723252017YFC0601503

2021

10.1016/S1003-6326(21)65768-0

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(12)
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