Material Composition And Deformation Characteristics Of The Munabulake Tectonic Mélange Belt In The South Altyn Tagh,Xinjiang

The Xinjiang Manablac structural melange zone is located at the northern edge of the Qinghai-Tibet Plateau.The junction between the southern Altyn Tagh and the East Kunlun is a product of the early subduction of the Early Paleozoic Archaean Oceanic lithospheric plate and belongs to the Apa-Zhanya ophiolitic mélange belt.(An important part of the South Altyn Ophiolitic Belt).Based on the study of structural dynamics and deformation mechanisms in the Aksu River area of Qiemo County,Xinjiang,this paper identified the material composition of the structural melange belt through a 1:1 million-scale geological mapping,profile survey,and laboratory analysis.Deformation characteristics,the period of tectonic deformation was divided,and the relative tectonic deformation sequence was established.From the tectonic point of view,new evidence was provided for the study of the formation and evolution of the Mannabulake structural melange belt.1.According to the strength of deformation,two types of "rock blocks" with weak deformation and "matrix" with strong deformation are classified from the Mannabulake structural melange belt,and from which there are 8 kinds of rock blocks—Marble association block,gneiss rock,olive Yanyan block,lava rock,rock lithology block amphibolite,gabbro Yanyan block,rock adamellite and Limestone-schist-schistoselized sandstone blocks,and 2 types of matrix: Felsic mylonite and fault fracture zone.2.The Mannabulak structural melange metamorphic peridotite and intermediate-basic lava show N-MORB characteristics,in which the intermediate-basis lava age is 464 Ma and the arc magmatic rock age is 461—450 Ma.It is speculated that the structural melange belt is The age of464—450 Ma formed;the age of the mylonitized monzonitic granites invading each rock mass and matrix was 413 Ma,and the upper age limit of the intrusion of the structural melange belt was 413 Ma.3.Identify the 4th stage structural deformation in the Mannabulake structural melange belt.The comparison of the 4th-stage deformation and regional tectonics identified in the in-band shows that the Mannabrak structure is a long-term subduction of the Early Paleozoic oceanic lithospheric plate and experienced early subduction collage,collision,extension,strike-slip,and late Overlay transformation.