陕西安康马岭关杂岩的岩性变化特征

The petrologic variation feature of Malingguan complex melange in Ankang area of Shanxi Province

研究区位于扬子板块与秦岭造山带的结合部位,是南秦岭造山带的重要组成部分,为查明马岭关杂岩的岩性组合特征、空间分布、产出形态、地层叠覆关系以及遭受构造变形改造情况,本次选取具有代表性的变质基性和中酸性火山岩的杂岩剖面进行岩石学特征的系统研究,将马岭关杂岩进一步划分为变质(中)酸性火山-碎屑岩岩片、变质基性(—超基性)岩岩片和变质碳酸盐岩岩片等3个非正式段级构造—岩石地层单位。

The study area is located at the junction of the Yangtze plate and Qinling orogenic belt. It is the important constituent part of the South Qinling orogenic belt. In order to find out the characteristics of lithology combination, spatial distribution, occurrence form, stratigraphic overlap relationship and the tectonic deformation of Malingguan complex melange, this time, systematic research of the petrologic feature has been carried out by selecting the representative melange profile of metamorphic basic and intermediate-acid volcanic rocks. The Malingguan complex melange can be divided into three informal structure-lithology-straturn seg- ments,which are metamorphic （mid） acidic volcanic-clastic rock segment, metamorphic basic （-ultrabasic） rock segment and metamorphic carbonate rock segment.