大别山东部桐城挂镇地区超高压变质杂岩的变形历史

THE DEFORMATION HISTORY OF THE ULTRAHIGH PRESSURE METAMORPHIC (UHPM) COMPLEX IN THE GUAZHENAREA， TONGCHENG，EASTERN DABIE MOUNTAINS

桐城挂镇地区1∶5万地质填图资料表明，超高压变质杂岩经历了四期变形事件：D1变形为榴辉岩相变形，形成时代约212±33Ma，D2为角闪岩相变形，形成时代为200～180Ma，D3为绿片岩相变形，形成时代为137.8±3.2Ma，D4为脆性变形，形成时代为96～112.6Ma。上述资料为阐明大别山碰撞造山带的演化模式提供了详实的地质依据和年代学证据。

The 1∶ 50000 regional geological mapping in the Guazhen area， Tongcheng,eastern Dabie Mts confirmed that the UHPM complx suffered four generations of deformation(D1,D2,D3 and D4).The first deformation(D1)took place in the process of eclogite facies of metamorphism(212 Ma)， D2 of amphibolite facies(200～ 180 Ma) and D3 of greenschist facies(137. 8 Ma). D4 is of brittle deformation (96～ 112. 6 Ma).