龙门山造山带彭灌杂岩体形成模式  

Study on the forming model of Pengguan complex of the Longmenshan orogenic belt

作　　者：林娟华[1] 刘春平[1,2] 

机构地区：[1]中国石化工股份江汉油田分公司勘探开发研究院,湖北潜江433124 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2009年第4期41-43,共3页Petroleum Geology and Recovery Efficiency

基　　金：国家油气专项"松潘-阿坝地区油气资源战略调查及评价"(XQ22004204)

摘　　要：形成于中晚元古代的彭灌杂岩体构造侵位于映秀断裂和茂汶断裂之间。杂岩体具有无根、深部岩片北西倾的特征;边界断裂及杂岩体内部早期为韧性变形,叠加晚期脆性改造,内部断裂呈叠瓦状排列,靠近茂汶断裂的杂岩体以韧性变形为主,向东南至映秀断裂,杂岩体韧性变形逐渐减少,脆性变形增加;茂汶断裂断面与志留系地层基本平行。以松潘—阿坝盆地的构造演化过程为基础,结合变质核杂岩理论,提出了彭灌杂岩体形成模式,该模式能有效解释彭灌杂岩体的所有特征。Pengguan complex formed in Meso-and Neoproterozoic was at tectonic emplacement between the Yinxiu fault and the Maowen fault.Pengguan complex is rootless and the deep horses incline to the northwest.The bordering fault zone and the inner complex have the tenacity deformation with superimposing brittle one,and the inner faults are imbricate arrangement.The complex deformation near the Maowen fault is mainly flexible,but gradually changes to brittle one from northwest to southeast.The attitude of Maowen fractured surface is almost the same with the Silurian formation.On the basis of analyzing the structural evolution of Songpan-Aba basin with the application of the metamorphic core theory,the forming model of Pengguan complex was proposed,which could interpret all features of Pengguan complex.

关 键 词：彭灌杂岩体 基底 映秀断裂 茂汶断裂 韧性形变 形成模式 

分 类 号：TE111.3[石油与天然气工程—油气勘探]