摘要
随着云南省锡矿普查勘探工作的进展,对东南亚锡矿带延入滇西的观点已为广大地质工作者所接受,但对应用地质力学探讨滇西锡矿带控岩控矿构造的认识尚有分歧。作者通过多年的工作实践及锡矿地质专题研究认为,有必要进一步强调歹字型构造体系对锡矿带展布(乃至矿床产出)的控制作用。一、构造体系概述有关滇西构造体系的成生及其复合、联合关系已有不少论述。本文在肯定已建立的纬向、经向和歹字型构造体系的基础上又对其作了进一步划分,并初步确定了华夏系和西域系构造在滇西的存在。(图1)
The eta-type structure system of western Yunnan began to develop in late Palaeozoic, became mature in Mesozoic, and its pattern was fixed by the fold movement in early Himalayan, the general development-evolution trend of which was from northeast to southwest. In this area, the time-space distribution and the evolution feature of the Mesozoic-Neozoic granite are completely consistent with the development and evolution of the eta-type structure zone, and controlled by the latter. The formation and distribution of the tin-deposits in western Yunnan are closely related to the tin-bearing granite of late Yanshanian--early Himalayan. The extension of the tin-deposit zone in western Yunnan is controlled by the eta-type structure system, which looks like a reversed 'S' as a whole. The metallogenetic structures of some tin orefields are mainly the faults of the eta-type structure system, and the favorable metallogenetic parts are NE tension-shear fracture, NNW compressocrushed zone and longituginal tracing tension fracture planes.
出处
《云南地质》
1989年第1期11-23,共13页
Yunnan Geology
