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首页> 外文期刊>Acta geologica Sinica: Journal of the Geological Society of China >Late Caledonian Ductile Thrusting Deformation in the Central East Kunlun Belt, Qinghai, China and Its Significance: Evidence from Geochronology
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Late Caledonian Ductile Thrusting Deformation in the Central East Kunlun Belt, Qinghai, China and Its Significance: Evidence from Geochronology

机译：青海中部东昆仑带晚古苏格兰延性冲断变形及其意义：来自年代学的证据

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摘要

A high-angle ductile thrusting deformation with top-to-the-north movement penetratively developed in the Proterozoic-Early Paleozoic metamorphic rocks along the Central East Kunlun belt. The deformed rocks suffered epidote-amphibolite facies metamorphism. On the basis of our previous study, we present more data in this paper to further support that the ductile thrust deformation occurred in the later Caledonian and more detailed information about the deformation. A zircon U-Pb concordant age of 446+-2.2 Ma of a deformed granodiorite in the ductile thrust zone was obtained and can be interpreted as the lower limit of the deformation. A syntectonically crystallized and also strongly deformed hornblende Ar/ Ar dating gives an Ar/Ar plateau age of 426.5+-3.8 Ma, which represents the deformation age. A strongly orientated muscovite gives an Ar/Ar plateau age of 408+-1.6Ma, representing the cooling age after the peak temperature, constraining the upper limit of the ductile thrust deformation. This ductile thrust deformation can be interpreted as the result of the closing of the Central East Kunlun archipelago ocean. To the north, Ar/Ar plateau ages of 382.9+-0.2 Ma and 386.8+-0.8 Ma of muscovite in the deformed Xiaomiao Group represent the uplift cooling ages of deeper rocks after the thrusting movement. The original thrusting foliation has a low angle. A rotation model was put forward to explain the development of the foliation from the original low-angle to present high-angle dipping.
机译：沿中东部昆仑带的元古代—早古生代变质岩中发生了由顶向北运动的高角度延性冲断变形。变形的岩石经历了附生-闪石相的变质作用。在我们之前的研究的基础上，我们在本文中提供了更多数据，以进一步支持延性推力变形发生在后来的古苏格兰时期，以及有关变形的更详细信息。获得了在延性推力区中变形的花岗闪长岩的锆石U-Pb一致年龄446 + -2.2 Ma，可以解释为变形的下限。共晶结晶并且强烈变形的角闪石Ar / Ar测年表明Ar / Ar平台年龄为426.5 + -3.8 Ma，代表了变形年龄。强取向白云母的Ar / Ar平稳年龄为408 + -1.6Ma，代表峰值温度后的冷却年龄，从而限制了延性推力变形的上限。这种延性推力变形可以解释为中东部昆仑群岛海洋关闭的结果。在北部，变形的小庙组白云母的Ar / Ar高原年龄为382.9 + -0.2 Ma和386.8 + -0.8 Ma，代表了冲动运动后较深岩石的隆升冷却年龄。原始的冲刺叶面角度较小。提出了一种旋转模型来解释从原始的低角度到现在的高角度浸入的叶面发展。

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