陕西柞水地区老安寺岩群及其地质构造特征

Lao’ansi terrane and its geological tectonic characteristics in Zhashui area,Shaanxi

Regional Geological Survey of Shaanxi Bureau of Geology and Mineral Resources, Xianyang 712000, China;Chang'an University, Xi'an 710054, China

摘要: 在秦岭柞水地区1:5万区调填图中,从商丹构造带南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,称为老安寺岩群.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、华北地块与扬子地块之间商丹拼接带地质体组成及地质构造特征均具有重要意义.
- 柞水地区 /
- 泥盆系刘岭群 /
- 老安寺岩群
Abstract: Within the 1/50000 field maping in Zhashui area,we have distinguished a medial-plutonic metamorphic belt that is composed of biotite-plagioclase granulitite,amphibolite and a little marble from the ploted Tongyusi formation of Liuling group in Devonian system By investigating the petrology and initial formation of the rock,adoption tectonic-lithostratigraphy-event' way,esrablished a new tectonic-ithostratic unit named Lao'ansi terrane.By Sm-Nd mean date(2 83 Ma),it is fixed in middle Proterozoic.The new result is important to study the geological composition and the geological-tectonic charact eristic of the center mountain-Qinling or ogen and the Shang dan assemblage zone between the North China and Yangtse block.
- Zhashui area /
- Lao’ansi terrane /
- Liuling group in Devonian system