湘桂粤赣地区中泥盆世棋梓桥期构造与层控矿床关系的初步探讨

PRELIMINARY DISCUSSION ON THE RELATIONSHIP BETWEEN THE QIZIQIAO AGE STRUCTURES AND STRATA-BOUND ORE DEPOSITS IN HUNAN, GUANGXI, GUANGDONG AND JIANGXI

本文根据湘桂粤赣地区中泥盆世棋梓桥期台,盆(或沟槽)与隆、拗对应的独特构造古地理面貌,以及这种格局与层控矿床空间分布的关系,初步分析了该期华夏系(NE向)构造和东西向构造对岩相古地理的演化及其对层控矿床成矿作用的影响;总结了构造活动尤其是断裂活动控制岩相古地理的空间位置和延伸方向,促进台、盆分异,以及构造逐级控矿、构造体系复合控矿和断裂对层控矿床的控制作用;提出了以华夏系构造为主导对层控矿床的控相(沉积相—成矿沉积环境)、控位(矿床或矿体的储存空间)的控制作用。

Based on studies on the unique structural and paleo-gepgraphical patterns( i.e., the correspondences between platform and rise, and basin and depression) of Qiziqiao age in Hunan. Guangxi, Guangdong and Jiangxi Provinces, and the relationship between these patterns and the distribution of strata-bound ore deposits, this paper makes a preliminary analysis of the influence exerted by the Cathaysian ( NE-trending) structures and EW-trending structures on the evolution of the lithofacies and paleogeography as well as on the metallogeny of strata-bound ore deposits. Conclusions have been drawn that tectonic activities, particularly faulting, controlled the distribution and extention of lithofacies and paleogeography and accelerated the evolution of platform and basin, and that the strata-bound ore deposits are controlled by structures of different ranks, including tectonic systems, the combination of them, and faults and fractures. In this paper it is also proposed that the Cathaysian system is the main structural system controlling the sedimentary facies (i.e., source bed of ore) and metallogeny.