新疆阿尔泰山南缘克兰盆地沉积构造演化与铅锌成矿

SEDIMENT-STRUCTURAL EVOLUTION AND LEAD-ZINC MINERALIZATION IN THE DEVONIAN VOLCANO-SEDIMENTARY KELAN BASIN IN SOUTHERN ALTAY, XINJIANG

位于西伯利亚板块阿尔泰大陆边缘的克兰泥盆纪火山沉积盆地具有明显的非对称性,其沉积构造演化经历了三个阶段:早期酸性火山-沉积阶段、中期基性火山-沉积阶段、晚期碎屑沉积阶段。盆地构造演化的各阶段都伴随着特定的成矿作用,形成了相应的矿床类型。在早期酸性火山-沉积阶段,主要表现为英安质-流纹质酸性火山活动及VHMS型铅锌成矿作用;在中期基性火山-沉积阶段,主要表现为玄武质基性火山喷发及SEDEX型铅锌成矿作用;在晚期碎屑沉积阶段,主要表现为陆源碎屑沉积作用,成矿作用相对甚弱。

Located in the Ahay edge of the Siberia plate, the Kelan Basin is obviously an asymmetric Devonian volcano - sedimentary basin, its sediment - structural evolution may be divided into three stages ： the early acidic volcano - sedimentary stage, the middle base volcano - sedimentary stage and the late clastic sedimentary stage. Mineralization occurred in the stages of the structural evolution, resulting in the corresponding deposit types. The VHMS lead - zinc mineralization occurred in the early acidic volcano - sedimentary stage, and corresponds to the acidic volcanic eruption. The SEDEX lead - zinc mineralization occurred in the middle base volcano - sedimentary stage, and corresponds to the base volcanic eruption. The extremely poor mineralization occurred in the late clastic sedimentary stage, and corresponds to the sedimentation process of the terrigenous clastics.