湖南锡矿山印支—燕山期构造演化及其在油气普查中的意义

锡矿山地处湘中,位于祁阳弧北(羽乙)内侧,研究锡矿山的构造演化及机制,对进一步揭示湘中地区的构造和祁阳弧的发育、发展有所裨益,对湖南地区寻找晚古生代—中生代的油气藏构造类型是有益的参考。

INDOSINIAN YENSHANIAN TECTONIC EVOLUTION OF XIKUANGSHAN,HUNAN AND ITS SIGNIFI-CANCE FOR OIL AND GAS PROSPECTING

This paper deals with the folds and faults of different directions,the minor-structures,especially incipient en echelon tension fissures filling with veins that are widely developed.It is shown that four horizontal compressive tectonic stress fields of different directions successively exerted on this district during the period from Indosinian to Yenshanian.This discovery is important and it provides clues and evidents for studying the tectonic evolution during this period in Southern China.According to the characteristics of structural deformation that were caused by different tectonic stress fields,it is inferred that there are possible favorable structural traps in the oil and gas-bearing rocks ranging from Upper Palaeozoic to Lower Triassic in Mid-Hunan area.We hope this result will throw some light on prospecting in this district.