南秦岭古生代沉积盆地沉积-构造事件与热水沉积成矿

Sedimentary-tectonic event and hyhrothermal depositional mineralization in palaeozoic sedimentary basin,south Qinling

地处扬子板块北部被动大陆边缘的南秦岭古生代沉积裂陷盆地具地堑-地垒式特点,沉积建造属次稳定型。早古生代加里东期发生的构造-岩浆活动颇具特点,沉积-构造事件对盆地演化及成矿起着重要作用,其与众多的(超)大型汞-锑、铅-锌、金矿关系密切。南秦岭热水沉积成矿方式主要以同生沉积-喷流方式,成矿物质来源于盆地下源深处,热水沉积作用是其主要成矿方式。热水沉积作用形成两大系列热水沉积岩:硅质岩-重晶石岩系列;钠长石岩-铁碳酸盐岩系列。铅-锌成矿与钠长石岩-铁碳酸盐岩关系更为密切。

Located on the passive continental margin of north part of Yangtse plate,south Qinling Palaeozoic sedimentary rift depression shows characteristics of graben and horst type and the sedimentary formation is sub stable. The structure-magmatic activities occurring in Caledonian period of Early Palaeozoic age is special and the sedimentary-structure event played a very important role in basin evolution and mineralization,which is closely associated with super large scale of Mercury-antimony,lead-zinc and gold deposit. South Qinling hydrothermal depositional ore forming style expressed a way as syndepositional cascade style of mineralization with the ore matter being origin in deep part of the basin and hydrothermal deposition was a main ore forming way. Hydrothermal deposition formed two series of hydrothermal sedimentary rock： siliceous rock-barite rock series and albite rock-iron carbonate series which is most closely associated with lead and zinc mineralization.