扬子地块北缘大幕山地区锑矿成矿预测

    Metallogenic prognosis of antimony deposits in Damushan area, north margin of Yangtze block

    • 摘要: 锑矿是重要的战略性矿产资源。大幕山地区地处长江中下游成矿带西南端, 经历了前震旦纪基底形成、震旦纪—早三叠世盖层沉积、中三叠世以来的碰撞造山和造山后板内变形等多个演化阶段, 处在不同构造体制交汇、衔接和转换的焦点部位。由于多期构造运动的叠加, 研究区具备了优越的浅成低温热液型锑矿床的成矿条件。大幕山地区研究程度较低, 笔者对已有的资料进行梳理, 深入总结锑成矿规律, 认为成矿物质主要来源于地幔和基底地层的混和, 岩浆的底辟作用是成矿物质上升的重要动力, 深大断裂尤其是层间滑脱断层是成矿流体运移和储存的重要条件。应用GIS技术, 对可以指导找矿的地质、物探、化探、遥感等信息进行了提取, 并据此圈定了9个找矿远景区, 其中A类远景区3个, B类2个, C类4个。研究结果可为研究区进一步找锑提供参考依据。

       

      Abstract: Antimony is a kind of important strategic mineral resource.Damushan area is located in the South-west of middle-lower Yangtze River valley metallogenic belt.This area has experienced several evolutionary stages such as basement sedimentation in Pre-Sinian, cover sedimentation from Sinian to Early Triassic, collisional orogeny since the Middle Triassic and intraplate deformation after orogeny.Multiple evolutionary stages resulted in the focus of the intersection, connection and transformation of different tectonic systems in Damushan area.As a result, this area is advantageous for mineralization of epithermal antimony deposit.The regional geology of this area is less studied.The author re-summarized the Sb metallogenic regularity through deeply analysis of the existing geological data, and suggests that Sb ore-forming materials are mainly come from the mixture of mantle fluids basement strata.Diapirism of magma is an important driving force for the rise of ore-forming materials.The deep faults, especially interlayer detachment faults, are important conditions for migration and storage of ore-forming fluids.Using GIS technology, the author extracted multi-source information of geology, geochemistry, geophysics and remote sensing, which indicated the existence of Sb mineralization.We re-extracted 9 prospecting areas, including 3 A, 2 B and 4 C level, which will benefit the ore prospecting of this region.

       

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