我国东南部地区层控矿床形成的构造环境和成矿作用

TECTONIC SETTINGS OF THE FORMATION OF STRATABOUND DEPOSITS AND THEIR METALLIZATION IN SOUTH-EASTERN CHINA

层控矿床形成必须具备二个基本条件:矿源层和矿质富集作用(本文称其为地质驱动作用),二者缺一不可。本文着重分析了我国东南部地区不同时期的矿源层形成的构造环境和各种地质驱动作用及其所形成的矿床特点。

The formation of stratabound mineral deposits must be provided with two basic conditions:Source beds and geological driving actions (Geological processes of enrichment). In south eastern China, the source beds mainly occur in Presinian, Sinian-Early Cambrian and Devonian-Early carboniferous strata and the location of the ores are controlled by structural environments of the sedimentary formations formed in different periods. The transitional belt between the marine and continental fades is the most favourable for the formation of source beds. Therefore, there is a certain regularity in ppatial distribution of source beds, which controls the distribution of stratabound mineral deposits. The geological driving actions in south-eastern China have many forms, i. e. faulting, folding, volcanic activity and intrusi-ms. However, most of the stratabound mineral deposits were formed by under the influence of combined actions. The intensity and frequency of geoiogica! driving actions and their combination forms will decide the characteristics of the stratabound mineral deposits.