黔东地区变质核杂岩构造及其控矿作用

Structure of Metamorphic Core Complex and Its Property to Control the Mineralization in the Eastern Area of Guizhou

黔东地区的变质核杂岩构造其变质核杂岩为中元古界四堡群、梵净山群变质基底,其主滑脱面发育于新元古界底部的甲路组,同时在下江群、板溪群中出现一系列次级滑脱面,在其上的早古生代地层中则发育伸展剥离正断层系统。该类型构造形成于加里东期末,是该区加里东造山期后隆升背景的产物。变质核杂岩构造与该地区的金、铜、铅、锌、锑及汞等矿产关系十分密切,它们分别受控于主滑脱带、次级滑脱带及伸展剥离正断层系统,且在剖面上矿物组合、成矿温度出现有规律变化,反映出该地区金及多金属矿产是受控于变质核杂岩构造的一个完整的、相互有机联系的成矿系统。

The structure of metamorphic core complex distributes in the eastern area of Guizhou, which complex constitute the metamorphic base of Mesoproterozoic Sibao Group and Fanjingshan Group, and master decoUement plane develops at the Neoproterozoic Jialu Formation, while a chain of secondary decollement planes emerge at the Xiajiang Group and Banxi Group, spreading decollement true fault system develops within the strata of the lower paleozoic. This kind of structure is the product under background of the uplift in Caledonian postorogenic phase formed at the end of the Caledonian Stage. The structure of metamorphic core complex is extremely associated to gold, copper, lead, zinc, antimony and mercury at this area, which are separately controlled by master decollement plane, secondary decoUement plane and spreading overburden true fault system, and besides, association of minerals and minerogenetic temperatures vary regularly on section that reveal the gold and multi-metallic mineral resources dominated by the structure of metamorphic core complex are attributed to an entirely correlative metaUogenic system.