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安徽铜陵新桥矿床主要由层状硫化物矿体组成,产于晚石炭世黄龙组底部由碎屑岩向碳酸盐岩过渡的部位.在层状矿体下盘围岩中发育细脉状、网脉状矿化.整合的层状硫化物矿体与下盘细脉-网脉状矿化共生是海底喷流沉积块状硫化物矿床的一个标志性特征.本文利用Re-Os同位素体系对新桥矿床下盘矿化中黄铁矿进行定年,得到的等时线年龄为319±13Ma(MSWD=16).该年龄与层状硫化物矿体的赋存层位基本吻合,为该矿床存在石炭纪喷流沉积成矿作用提供了新的年代学证据.
The Xinqiao deposit in Tongling, Anhui Province is mainly composed of layered sulphide ore bodies and is produced at the site of the transition from clastic rocks to carbonate rocks at the bottom of the Late Huangshi Formation in Late Carboniferous. , Reticular mineralization.The integrated layered sulfide ore body and the lower plate vein - reticulate mineralization symbiosis is a signature feature of the submarine jet flow massive sulphide deposits.In this paper, Re-Os isotope system The dating of pyrite in the plate mineralization of Xinqiao deposit shows that the isochron age is 319 ± 13Ma (MSWD = 16), which coincides with the occurrence of stratigraphic sulphide orebodies. The deposit provided a new geochronological evidence for the sedimentary mineralization of the Carboniferous.