广西丹池地区泥盆纪盆地演化与成矿  

Devonian basin evolution and mineralization in Nandan-Hechi area,Guangxi

作　　者：黄宏伟[1,2] 杜远生[1] 

机构地区：[1]中国地质大学(武汉)地球科学学院,湖北武汉430074 [2]广西地质勘查总院,广西南宁530023

出　　处：《中国地质》2009年第3期669-676,共8页Geology in China

基　　金：广西地矿局科研项目“广西丹池盆地演化与成矿研究”;国家自然科学基金项目(40621002)联合资助

摘　　要：广西(南)丹(河)池盆地从早泥盆世埃姆斯期开始裂陷,于三叠纪随着金沙江—红河—马江古特提斯洋的闭合而逐渐萎缩、消亡。野外地质调查发现,海西期地壳运动控制沉积盆地的形成和演化,基底断裂控制盆地的古地理格局,二者联合控制盆地的岩石地层格架,为后期成矿提供良好空间。事件沉积与成矿关系密切,赋矿层位均为事件沉积的高峰期。盆地内部次级北西向断陷槽是形成大型—超大型锡多金属矿床的重要场所,由次级基底断裂控制的海底火山喷气或喷流作用是盆地内部重要的成矿作用。The Nandan-Hechi basin in Guangxi started rifting at the late Early Devonian Emsian stage, and withered and died out gradually with the closure of the paleo-Tethys ocean along the Jinsha River, Honghe River and Majiang River in Triassic. Geological field survey has revealed that crustal movement controlled the formation and evolution of the sedimentary basin, that the basement fault controlled the paleogeographic evolution, and that both of the two factors controlled the lithostratigraphic framework and provided ideal space at the late ore-forming stage. Event deposition was closely related to mineralization and all the ore-bearing layers were formed at the peak of event deposition. The second-order NW-trending rift-trough in the basin seems to be an important ore-forming location for large and superlarge tin-polymetallic deposits. Important mineralization resulted from submarine volcanic exhalation or eruption controlled by the second-order basement fault in the basin.

关 键 词：广西 丹池盆地 泥盆纪 热水沉积 成矿作用 

分 类 号：P534.44[天文地球—古生物学与地层学] P611.22[天文地球—地质学]