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Tectonic‐magmatic framework identified by remote sensing analyses and geochronology in West Junggar, Central Asian Orogenic Belt
Geological Journal ( IF 1.8 ) Pub Date : 2020-11-03 , DOI: 10.1002/gj.4028
Guo‐Liang Zhang 1, 2 , Tao Hong 3, 4 , Xing‐Wang Xu 1, 5, 6 , Chu Wu 1, 7 , Hao Li 1 , Yuan‐Wei Chen 2
Affiliation  

The temporal and spatial evolutions of the Darbut Fault deformation patterns were analysed for multiple deformation stages in this study by using a regional geological survey, quantitative remote sensing image analyses, and structural analyses. Remote sensing images indicating that the Karamay granitoid batholith is greenish‐grey, the Hongshan granitoid batholith is yellowish‐green along the Darbut Fault, and the Miaoergou, Akebasitao, and Hatu granitoid batholiths are round in shape and luminous yellow colour. The remote sensing images of the Darbut Fault, Hongshan granitoid batholith, and data from previous research suggest that the upright folds (F1) in the Carboniferous strata near the Darbut Fault and northeast‐southwest (NE‐SW) striking sub‐vertical dextral shear zones in the mélanges represent the regional dextral strike‐slip shear zones. The NE‐SW striking transcurrent sinistral strike‐slip faults and ‘S‐shaped’ drag folds (F2) overprinted the dextral shear zones. The Hongshan batholith is a complex pluton, which was composed of alkaline feldspar granite, syenite granite, and monzogranite. The LA‐ICP‐MS U–Pb 311–307 Ma of zircons from the ductilely deformed Hongshan alkaline feldspar granite and monzogranites are formed during the dextral shear zone of the Darbut Fault. The 302 Ma Hongshan alkaline feldspar granite is contemporarily formed during the sinistral strike‐slip stage of the Darbut Fault. The Hongshan complex pluton has a prolonged formation age and witnesses the whole process of ocean‐land conversion from the capture of island arc‐related rocks, granite formed in the post‐collision stage, and dyke swarms formed in the intracontinental extension stage.

中文翻译:

中亚造山带西准gar尔遥感分析和年代学确定的构造岩浆框架

通过使用区域地质调查,定量遥感影像分析和结构分析,分析了Darbut断层变形模式在多个变形阶段的时空演变。遥感图像显示克拉玛依花岗岩基岩为绿灰色,红山花岗岩基岩沿达布特断层为黄绿色,苗儿沟,阿克巴斯陶和哈图花岗岩基岩呈圆形,呈黄色。红山花岗岩基岩Darbut断层的遥感影像和以前的研究数据表明,竖向褶皱(F 1)在达布特断裂附近的石炭系地层和东北部西南偏南的右旋右旋剪切带代表了区域右旋走滑剪切带。NE‐SW撞击横流左旋走滑断层和'S形'褶皱(F 2)套印右旋剪切带。红山岩床是复杂的岩体,由碱性长石花岗岩,正长花岗岩和辉长花岗岩组成。在达布特断裂的右旋剪切带形成了韧性变形的红山碱性长石花岗岩和辉长花岗岩的锆石LA-ICP-MS U-Pb 311-307 Ma。302 Ma Hongshan碱性长石花岗岩是在Darbut断层的左旋走滑阶段同时形成的。红山复杂岩体的形成年龄延长,并见证了从岛弧相关岩石的捕获,碰撞后阶段形成的花岗岩以及洲际延伸阶段形成的堤防群的整个海陆转换过程。
更新日期:2020-11-03
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