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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。
The structure of the Peng-Goro complex formed during the middle and late Proterozoic erupted between the Yingxiu fault and the Maumun fault. The complex body has the feature of non-rooted and deep karst northwest-dipping. Boundary faults and early ductile deformation in the complex body are superimposed with late brittle alteration, and the internal faults are arranged in a shingles. The complex near Maowen fault is characterized by ductile deformation Mainly, to the southeast to Yingxiu fault, the ductile deformation of the complex gradually decreases and the brittle deformation increases; the Maowen fault section is basically parallel with the Silurian strata. Based on the tectonic evolution of the Songpan-Aba Basin and combining with the metamorphic core complex, a model of Peng-Peng complex is proposed, which can effectively explain all the features of the Peng-Peng complex.