鄂拉山查查香卡地区晚三叠世火山岩产出环境分析

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。

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

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.