鄂拉山查查香卡地区晚三叠世火山岩产出环境分析

Analysis of Environment for Late Triassic Volcanic Rocks in Chachaxiangka,Elashan

通过对查查香卡地区晚三叠世火山岩岩石学研究,确定该套火山岩属晚三叠世鄂拉山组,属钙碱性系列。喷出时的大地构造环境为陆内造山环境,该火山岩最初可能形成于大陆边缘环境,由于A型俯冲构造活动,测区乃至鄂拉山地区产生一系列右旋走滑断裂带,受北西向右旋走滑断裂的影响,岩石孔隙加大,并出现强烈的热流活动,导致岩浆沿这些断裂带喷出地表。

Through study on Petrology of the Late Triassic volcanic rocks from Chachaxiangka area, the volcanic rocks belong to Elashan Formation and are calc- alkaline series. Considering the tectonic setting of intra-continental orogenic environment, the Late Triassic volcanic rocks initially may form in the continen- tal marginal environment. Researched area and even Elashan area produced a series of right rotary sliding fault zone because ＂A＂ type subduction. Affected by northwestern Right-lateral strike slip fault zone, rock pore increased and strongly heat flow activities appears coursing magma spray out surface along these fault zone.