秦岭造山带泥盆纪三级构造热水沉积成矿盆地主控因素——大型—超大型矿床集中区研究(Ⅰ)

从系统学和协同学角度研究分析了秦岭造山带泥盆纪三级构造热水沉积成矿盆地的主控因素。认为三级构造热水沉积成矿盆地是受诸多因素控制的一个构造—热水成岩成矿系统 (一种非线性、自组织系统 )。秦岭深部岩石圈地幔近南北向收缩与佛坪大陆热点构造 ( hotspot)的耦合 ,引发陆壳浅部发生近东西向伸展 ,触发热水 (能 )从深部向陆壳浅部大规模运移。近东西向高序次同生断裂控制一级沉积盆地的形成与演化。不同级次的同生断裂是控盆—成盆的主控因素 ,低序次 NE向、NW向和 SN向同生断裂是秦岭造山带泥盆纪三级构造热水沉积成矿盆地的主控因素 ,也是热水喷流进入盆地的构造通道。三级构造沉积盆地为热水成岩成矿系统发生大规模聚集成矿提供了构造空间

KEY CONTROLS OF DEVONIAN THREE ORDER HYDROTHERMAL SEDMENTARY BASIN WITH MINERALIZER IN THE QINLING OROGEN, CHINA——RESEARCH ON ACCUMULATIONAL DISTRICT OF LARGE-SUPERLARGE ORE DEPOSITS (PART Ⅰ)

Key controls of Devonian three-order hydrothermal se dimentary basin with mineralization in the Qinling orogen has been discussed from the view of systemic science in this paper. It is believed that Devonian three-order hydrothermal sedimentary basin with mineralization in the area, which were controlled by continental hotspot and syn-fault, was a system of tectonic hydrothermal depositions. This may be a kind of nonlinear self-organization. Coupling of deep, slow, north-directed compression of Earth mantle in the Qinling and Foping continental hotspot resulted in extension of the upper crust. On the other hand, this coupling forced, at a large scale, migration of hydrothermal fluid and hot energy from deep mantle to the Earth surface. Key controls of Devonian basin-control and basin formation were probably different-order syn-faults in the area. First-order syn-faults trending east-west were responsible for formation and evolution of first-order sedimentary basin, while threeorder syn-faults trending north-northeast, north-northwest, and south-north were responsible for formation of three-order basin with hydrothermal deposition. Three-order basin provided for hydrothermal deposition at large with well-prepared tectonic space.