京西房山岩体南侧青白口系下马岭组构造片岩中红柱石的变形特征及其地质意义  

Deformation features of andalusite in tectonic schist of the Xiamaling Formation of the Qingbaikouan System on the southern side of the Fangshan pluton in the Western Hills,Beijing,China

作　　者：万永平[1] 王根厚[1] 郭春影[1] 于海亮[1] 张静[1] 

机构地区：[1]中国地质大学,北京100083

出　　处：《地质通报》2007年第2期200-205,共6页Geological Bulletin of China

基　　金：国家自然科学基金项目(编号:49802019);中国地质大学(北京)周口店实习基地建设项目资助。

摘　　要：在房山岩体南侧下马岭组构造片岩中发现红柱石横截面上发育一组共扼裂隙和“环带状”构造,环带形状与红柱石变斑晶横截面的形状相似,均压扁为长方形,红柱石的变形是同构造递进变形的结果。裂隙及环带均被流体包裹体所充填,流体包裹体的热爆温度为604～685℃,利用黑云母-石榴子石温度计得出变质温度为592℃。计算出变质发生深度为2.69～3.11km。A set of conjugate fractures and zonation structure are found on the cross section of andalusite in tectonic schist of the Xiamaling Formation on the southern side of the Fangshan pluton, Western Hills, Beijing. The zones have been flattened into a rectangle shape, which closely resembles the shape of the cross section of andalusite porphyroblasts. The andalusite deformation is the result of syntectonic progressive deformation; the fractures and zones are filled with fluid inclusions. The decrepitation temperatures of andalusite range from 604 to 685℃ and the metamorphic temperature obtained using the biotite-garnet geothermometer is 592℃. Thus the calculated metamorphic depth is 2.69-3.11 km.

关 键 词：北京 房山岩体 红柱石 流体包裹体 共扼裂隙 环带状构造 变形及变质 

分 类 号：P534.3[天文地球—古生物学与地层学] P578.945[天文地球—地质学]