柞水岩群及其地质构造特征

在秦岭柞水地区1：5万区调填图中，从商丹构造侧前人划分泥盆系刘岭群桐峪寺组中新解体出一套由黑云母斜长变粒岩、斜长角闪岩及少量大理岩等组成的中深变质岩系。通过岩石学及原岩建造的研究，采用构造－岩层－事件方法的综合分析与对比，新建立了构造岩层（石）地层单位，称为柞水岩群，依据Sm-Nd年龄（平均值）2283Ma，将其时代暂定为中元古代，这一新成果对研究中央山系秦岭造山带华北地块与杨子地块商丹拼接地带地质体组成及地质构造特征均具有重要的意义。

GEOLOGICAL AND STRUCTURAL FEATURES OF THE ZHASHUI ROCK GROUPS

Based on geological mapping at a scale of 1:50,000 in Zhashui area in Qinling mountains, a set of medium deep metamorphic rocks has been distinguished from the Dongyuci Formation of the Devonian Liuling Group at the south side of the Shangxian Danfeng structural zone. It is composed of biotite plagioclase leptynite, amphibolite and a little of marble. Comprehensive analysis and correlation of structure terrane event, and studies on lithology and primary formation have produced a new stratigraphic unit of structural terrane (rock), i.e. the Zhashui Rock Group, the age of which is temporarily fixed in the Meddle Proterozoic era according to the age (averaged) of 2,283 Ma from Sm Nd. It has an important significance for further studying the geological composition and the geological structural features of the Shangxian Danfeng coalescent zone between the North China Plate and the Yangtze Plate in the Qinling orogenic zone.