湖南千里山—骑田岭矿集区形成的构造背景初探

ELEMENTARY DISCUSSION ON THE TECTONIC BACKGROUND OF DEPOSIT-CONCENTRATED QIANLISHAN-QITIANLING AREA IN HUNAN

从地层、构造力学体系、岩浆岩分布、地球物理、地球化学特征等方面分析,提出前泥盆纪在炎陵—蓝山构造岩浆岩带两侧的地质体是分离的。通过对地块拼贴时力的作用和平面变形的分析,认为炎陵—蓝山北东向构造岩浆岩带是两个地块的拼贴线;郴州—邵阳北西向构造岩浆岩带是地块拼贴时的应力集中带,两带交汇于此,是千里山—骑田岭矿集区形成的最本质的原因。

Qianlishan-Qitianling is an important deposit-concentrated area in the middle section of Nanling metallogenic belt. Many scholars made extensive discussions on the geological occurrences of individual deposits or mine fields, but the works can not be used to explain the geological background for the occurrence of the whole deposit-concentrated area. Through stratigraphic analysis, tectonic mechanical system analysis as well as analysis on magmatite distribution, geophysical & geochemical traits, a suggestion was put forward that the geologic bodies of Lower Devonian on both sides of Yanling-Nanshan tectonic magmatite belt were distinct from each other. Through analysis on plane deformation and stress action based on the assumption of two land-blocks, the authors think that the magmatite belt of Yanling-Nanshan NE structure can be the line by which the two terranes are put together, and the magmatite belt of Chenzhou-Shaoyang NW orientation structure is stress-concentrated belt when the masses are joined together. This could be the most essential cause to account for the fact that Qianlishan-Qitianling deposit-concentrated area was formed and the two metallogenetic belts were intersected here.