大兴安岭北段上坑锅铅锌矿床地质特征及成因初探

The greater hinggan mountains north pit pot pb-zn deposit geological characteristics and genesis

中生代时期由于受太平洋板块俯冲作用的影响,大兴安岭北段产生强烈的火山-次火山作用。以中生代火山断陷区为构造背景,火山断陷盆地产生大量的铅锌多金属矿化。本文从成矿地质背景入手,论述了上坑锅矿床的主要特征及控矿因素,综合分析了矿床地球化学特征,提出了上坑锅矿床属于典型火山热液型矿床,具有三期成矿特点。

Due to the subduction of the Pacific plate in Mesozoic Era, severe volcanic-subvolcanic activities took place in the Daxinganling region. On the tectonic background of Mesozoic volcanic fault depression, amounts of Pb-Zn polymetal mineralization occur on the margin of the fault depression and the in the connecting belt between depression and uplift.This paper started from the basic geological characteristics of the deposit,discussed and analyzed the pyroclastic construction and mineralization characteristics of the layered Ag - Pb - Zn orebody. The result shows that the deposit has metallogenic features with thire different periods and the layered orebody belongs to the volcanic eruption-diagenesis orebody with ore-bearing rocks of volcanic block-breccia layer controlled by the volcanic edifice.