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首页> 外文期刊>Journal of Asian earth sciences >Timing of magmatism and ultrahigh- to high-grade metamorphism in the Kannak Complex, Kon Turn Massif, Vietnam: Magmatic activity and its tectonic implications
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Timing of magmatism and ultrahigh- to high-grade metamorphism in the Kannak Complex, Kon Turn Massif, Vietnam: Magmatic activity and its tectonic implications

机译：山口复合体的岩浆学和超高级变质的时机，越南越南：岩石活动及其构造效应

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摘要

Detailed geochronological and petrological investigations of metamorphic and igneous rocks can significantly improve our understanding of the tectonic processes that occur in orogenic belts. The Kon Turn Massif, central Vietnam, includes various types of magmatic and metamorphic rocks, the latter including ultrahigh- to high-temperature units. The Late Permian-Early Triassic metamorphic rocks in the massif correspond to the metamorphic characteristics of a collision between the Indochina and South China blocks in terms of their metamorphic evolution and timescales of deformation. U-Pb geochronological analyses of zircon obtained from two samples of garnet granite in the massif yielded magmatic ages of 239.6 +/- 3.9 Ma and 243.5 +/- 3.4 Ma. This permitted the reevaluation of previous Th-U-Pb electron microprobe analyses of monazite from the garnet granite and garnet-orthopyroxene gneiss and previously published U-Pb dating. These data reveal the metamorphic and magmatic history of the western part of the massif. The metamorphic rocks show a thermal evolution from 260 Ma to 240 Ma. Magmatic activity started at 260 Ma and ceased at 240 Ma. Considering this in terms of the regional-scale igneous activities in the Kon Turn Massif, the base of the massif, already thickened by the collision, was situated above underplating plume-related magma. Such magmatic activity resulted in high- to ultrahigh-temperature metamorphism and crustal melting during the Late Permian to Early Triassic, between 260 and 240 Ma.
机译：变质和火成岩的详细地质学和迂化研究可以显着提高我们对造口皮带发生的构造过程的理解。越南市中心的Kon Turn Massif包括各种类型的岩石和变质岩石，包括超高至高温装置。 MassIF中的晚期二叠纪早期三叠纪变质岩岩石对应于Indochina和华南地区碰撞的变质特征，在其变质演变和变形的时间表方面。从MassIF中的两个石榴石花岗岩样品获得的Zircon的U-PB地理学分析产生了239.6 +/- 3.9 mA和243.5 +/- 3.4 mA的岩浆衰弱。这允许从石榴石花岗岩和石榴石 - 垂直酮球和先前公布的U-Pb约会中重新评估Monazite的Monazite分析。这些数据揭示了大块西部的变质和岩石历史。变质岩石显示出260 mA至240 mA的热量演进。 Magmatic活动开始于260 mA，停止在240 mA。考虑到这一点，在KON转弯的区域范围内，由于碰撞已经增厚的受损的基部位于底层羽流相关的岩浆上。这种岩浆活性在晚期二叠系期间高于超高温的变质和地壳熔化，以早期三叠系，在260和240 mA之间。

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