论文部分内容阅读
控矿构造一直是热液矿床研究的难点之一,本文以大兴安岭中段为研究对象,通过1∶25万柴河镇幅和蘑菇气幅地质调查,提出:(1)该区主干控矿构造由大黑山—太平岭—鸡冠山北断裂带和扎兰屯市—哈多河断裂带构成,形成时代主要为海西期和燕山期。(2)控矿构造性质主要表现为压性、张性和剪切性质,三者之间分别经历了剪切与拉张,剪切与压扭性质之间的转换,主压应力场依次发生E-W向、SE-NW向、SSE-NNW向三次变化。(3)总结出该区主干构造控矿、分枝构造控矿、平行构造控矿和斜列构造控矿等若干赋矿规律,该赋矿规律与该区导矿构造,导矿构造和矿源与深部板块俯冲产生熔融岩浆密切相关。这些新认识为该区的地质基础、成矿理论深入研究和找矿工作等均具有重要的意义。
The ore-controlling structure has been one of the difficulties in the hydrothermal deposit research. Taking the middle section of Daxinganling as the research object, the geological survey of 1: 250000 Chaihehe amplitude and mushroom gas amplitude shows: (1) Da Hei Shan - Taiping Ridge - Jiguanshanbei fault zone and Zhalantun - Heduohe fault zone. The formation age is mainly Hercynian and Yanshanian. (2) The ore-controlling tectonic features are mainly compressive, tensile and shear. The three have undergone the transitions between shear and tension, shear and compression-torsion, and the principal compressive stress fields occur in turn EW direction, SE-NW direction, SSE-NNW three changes. (3) It is concluded that some ore-controlling laws such as ore-controlling in the main structure of the area, ore-controlling by branching structures, ore-controlling by paralleling structures and ore-controlling by inclined columns are summarized. The rules of ore-dressing are in line with the ore-bearing structure, It is closely related to the subduction of the deep plate to produce molten magma. These new understandings are of great significance for the geological foundation of the area, in-depth research on mineralization theories and prospecting work.