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首页> 外文期刊>Journal of Asian earth sciences >Syntectonic metamorphism of a collisional zone in the Tuva-Mongolian massif, Central Asian Orogenic belt: P-T conditions, U-Pb ages and tectonic setting
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Syntectonic metamorphism of a collisional zone in the Tuva-Mongolian massif, Central Asian Orogenic belt: P-T conditions, U-Pb ages and tectonic setting

机译：Tuva-Mongolian Massif中碰撞区的宪术变质区，中亚洲造山带：P-T条件，U-PB Ages和构造环境

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Accretionary-collisional events occurred at the western margin of the Tuva-Mongolian microcontinent are used to explain the largely contradictory Cambrian geodynamic history of the western Central Asian Orogenic Belt (CAOB). This study presents new data for the Erzin metamorphic complex in order to constrain the petrogenesis and tectonic implications of the metamorphic rocks in this complex. The Erzin complex in the tectonic Erzin zone is composed of high-grade metamorphic rocks that have formed under variable metamorphic conditions (T = 730-835 degrees C, P = 5.3-7.5 kbar). In the Erzin complex, metamorphic rocks have undergone multiple stages of ductile deformation with subvertical mineral lineation and were then superimposed by sub-horizontal ductile deformation. The stages of tectonic deformation are close in time and mark collisional stages characterized by a sequential change from the compression regime to the extension regime in the period of 495 +/- 5 Ma. The determination of the time interval is based on structural and petrological data, previously published materials, as well as the dating of granite dikes (U-Pb, zircon) sealing the Erzin complex. P-T conditions and structuralpetrological studies analysed in this paper suggest that the formation of the Erzin metamorphic complex occurred as a result of a collisional event between the Tannuola island arc and Tuva-Mongolian microcontinent. We suggest that the Erzin metamorphic complex is important for study of transitional regime between the collisional event and initial orogenic collapse in the ancient fold belts. Metamorphic record of the TuvaMongolian microcontinent provides important information about the processes that occurred at the Early Paleozoic geodynamic evolution in the western CAOB.
机译：Tuva-Mongolian Microconinient的西部边缘发生的累积事件用于解释西部中亚造山带（Caob）的主要矛盾的寒武纪地球动力学史。本研究提出了Erzin变质复合物的新数据，以限制该复合物中变质岩石的纤维化和构造影响。构造Erzin区中的Erzin复合物由在可变变质条件下形成的高档变质岩（T = 730-835℃，P = 5.3-7.5 kbar）组成。在Erzin复合物中，变质岩石经历了多个延性矿物质氨酸的延性变形阶段，然后通过亚水平的延展性变形叠加。构造变形的阶段在时间和标记中，以495 +/- 5 mA的时期，从压缩制度到延伸制度的顺序变化的标记阶段。时间间隔的确定基于结构和岩石学数据，以前公布的材料，以及密封Erzin复合物的花岗岩堤坝（U-Pb，锆石）的约会。本文分析的P-T条件和结构性化学研究表明，由于Tannuola岛弧和图瓦 - 蒙古微大学之间的碰撞事件，形成了Erzin变质复合物的形成。我们建议，Erzin Metalymerphic Complex对古折腰带碰撞事件和初始造山坍塌研究的过渡制度非常重要。 Tuvamongolian微型的变质记录提供了有关在西曹莹西部古生代地球动力学演变中发生的进程的重要信息。

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