秦岭造山带泥盆系热水沉积岩相应用研究及实例

构造-热水沉积岩相与盆地的古地理环境, 热水沉积岩相与热水沉积成矿,热(水) 流体岩相与构造背景、构造古地理,它们之间有密切地内在联系.应用热水沉积岩相、沉积相及沉积体系分析方法，对凤县铅硐山-双石铺三级构造热水成矿盆地进行研究。

On Implications of the Devonian Hydrothermal Sedimentary Faci es in the Qinling Orogeny

The Qinling orogenic belt is located in the central China and is one of the most important intracontinental orogeny in the world. Devonian sedimentary basins are the major accumulation structures for Au-Ag-Pb-Zn deposits in the area. Fengtai Devonian pull-apart basin, one of the accumulation basins in the Qinling orogeny, hosted a series of large-superlarge Au-Pb-Zn deposits such as Qiandongshan and Dongtangzi large Pb-Zn deposits and Baguamiao superlarge Au deposits. Lead-zinc orebodies hosted at a suite of hydrothermal depositional rocks in the three-order hydrothermal basins. Therefore, research on relationship between the hydrothermal depositional facies and the three-order hydrothermal basin is the best way to understand the relationship between metal deposits and the hydro thermal depositional basin. 　　The concept of hydrothermal sedimentary rock facies at the Devonian in the Qinling orogeny has been initiated. Relationships between tectonic hydrothermal sedimentary facies and paleo-geographic framework of sedimentary basin, between hydrothermal sedimentary facies and mineralization of hydrothermal depositions, and between hydrothermal sedimentary facies and tectonic geographic framework are very important in the analysis of sedimentary basin. On the basis of associat ions of the hydrothermal sedimentary facies, sedimentary lithofacies, and sedime ntary system, the Qiandongshan-Shuangshipu third-order hydrothermal deposition al basin has been analyzed in this paper. Three depositional systems are recogni zed in the Qiandongshan-Shuangshipu third-order hydrothermal depositional basin. Carbonate rock formation was formed in a shallow water environment at the beginning of the t hree-order basin while fine clastic rock formation was formed in a shallow wat er envi ronment at the closedown of the three-order basin. The hydrothermal deposition al system between them was developed in half-deep or deep water, limited, reducing env ironment in the three-order hydrothermal basin. NE-trending synfault were res pon sible for the formation of the Qiandongshan-Shuangshipu downfaulted three-ord er basin. Based on analysis of paleotectonics and basin-filling sediments, the data su ggests that the Qiandongshan-Shuangshipu three-order basin with hydrothermal d ep ositions were probably formed in tectonics field of tensile-shear stress in the Middle-Late Devonian.