长枪穹隆体变质岩岩石矿物学特征及其变质作用  

Mineralogy and Mtamorphism of the Changqiang Metamorphic Dome

作　　者：罗华翠 阚泽忠[2] 杨桦[3] 杨泽湘[3] 秦华中[4] 易同富[3] 

机构地区：[1]四川省地矿局物探队,成都610072 [2]四川省地质调查院,成都610081 [3]四川省地矿局攀西地质队,四川西昌615000 [4]四川省地矿局区调队,成都双流610213

出　　处：《四川地质学报》2012年第2期133-138,共6页Acta Geologica Sichuan

摘　　要：长枪穹隆体是扬子地台西缘四川丹巴—木里一带具有代表性的穹隆状变形变质体之一。通过对该穹隆体变质岩主要变质矿物及变质特征的研究,可将其划分四个变质作用阶段。根据穹隆核部出现点状锰铁铝榴石带、递增变质带分布与穹隆构造分带不完全重合、主期变质地热梯度较高等特征,认为长枪穹隆体具有构造-热穹隆性质。The Cangqiang dome is one of typical metamorphic domes in the Danba-Muli belt on the west margin of the Yangtze platform. 4 metamorphic stages may be divided in the metamorphic dome on the basis of mineralogy and metamorphism. Imperfect coincidence of spotted mangan-almandite zone and progressive metamorphic zone with structural zonation of the dome and higher geothermal gradient in the principal metamorphic stage indicate that the Changqiang metamorphic dome is a tectonic-thermal one.

关 键 词：穹隆体 变质岩 P-T-t演化趋势 四川木里长枪 

分 类 号：P57[天文地球—矿物学]