新疆东昆仑地区鸭子泉-鸭子达坂构造混杂岩的地质特征及其意义
Geological Characteristics and Significance of Yaziquan-Yazidaban Tectonic Melange in East Kunlun Area of Xinjiang
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摘要: 研究区位于东昆仑造山带的西部,北邻阿尔金造山带,南与巴颜喀拉褶断带接壤.笔者对鸭子泉-鸭子达坂构造混杂岩的物质组成及其特征、微量元素特征及稀土元素特征进行详细研究,对其构造变形特征进行阐述和分析,并通过锆石SHRIMP U-Pb年龄及其与晚三叠世喀勒拉组火山岩角度不整合接触,最后将形成时代厘定为石炭纪—二叠纪.鸭子泉-鸭子达坂构造混杂岩带历经了自华力西—印支旋迴的多期、多体制、多层次的构造变形,显示强烈的多期构造混杂特征.并探讨了鸭子泉-鸭子达坂构造混杂岩带的构造属性,认为鸭子泉火山岩岩组火山岩形成于板块汇聚俯冲的岛弧环境,岩浆可能来源于俯冲消减和地幔楔形区物质的局部熔融.Abstract: South to the Altun orogenic belt and north to bayankala faulted zone, the research area locates in the west of East Kunlun orogenic belt. In this paper, the authors studied Yaziquan-Yazidaban tectonic melange from perspectives of material composition and its features, trace elements and rare earth elements features in detail. The tectonic deformation characteristics were also expounded and analyzed. According to zircon SHRIMP U-Pb age and its unconformable contact with volcanic rock angle of Kalela formation of late Triassic, the mélange was found formed in carboniferous-Permian. Yaziquan-Yazidaban tectonic melange belt experienced multiphase, multisystem and multilayer tectonic deformations since Hercynian-Indosinian period. The paper also discussed the tectonic attributes of the research area. It is considered that the volcanic rocks formed in the island arc environment of plates' convergence and subduction, with its magma probably coming from partial melting of the mantle wedge and subduction area.
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