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首页> 外文期刊>Journal of Asian earth sciences >Dating multiple generation of zircons from granites and gneiss from Thailand: Implication for the crustal evolution of the Sibumasu terrane
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Dating multiple generation of zircons from granites and gneiss from Thailand: Implication for the crustal evolution of the Sibumasu terrane

机译：约会来自泰国的花岗岩和片麻岩的多代锆石：对Sibumasu地壳的地壳演化意义

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摘要

The widespread granitic rocks of the Sibumasu terrane were emplaced during the collision of the Sibumasu and Indochina in the Triassic. Previous studies have suggested that each granite had a simple, single-step magmatic evolution. In situ LA-MC-ICP-MS U-Pb zircon dating of granites and gneiss from Thailand revealed the evolution of these rocks: Inherited zircon core ages (515 +/- 130 Ma) from a granite of the Chonburi pluton in the Central-Granitoid Belt are coeval with an orthogneiss protolith age (513.6 +/- 9.2 Ma) from Hua Hin area. Similar Cambrian ages were also reported from the Khao Tao area in southern Thailand. Moreover, there are a series of inherited zircon core ages from Neo-Proterozoic (1017 +/- 43 and 984 +/- 56 Ma), Ordovician (449 +/- 26 Ma), Devonian (385 +/- 15 Ma), Carboniferous (316 +/- 12 Ma) to Permian (276 +/- 31 and 266 +/- 12 Ma). Taken together, these Neo-Proterozoic to Permian protolith ages are interpreted to represent the basement of the Sibumasu terrane in Thailand. Two magmatic zircon growth events can be distinguished at approximately (a) 241.8 +/- 8.2 to 235 +/- 12 Ma and (b) 230.6 +/- 3.4 to 213.4 +/- 3.0 Ma. We concluded that the Sibumasu and Indochina collision during the Triassic caused a two-step magmatic evolution of the granites of the Sibumasu terrane. The first magmatic crystallization during the Middle Triassic corresponded to the Sibumasu and Indochina collision, and the second magmatic crystallization during the Late Triassic was related to the late-collisional stage.
机译：Sibumasu和印度支那在三叠纪发生碰撞时，就布满了Sibumasu地形的广泛花岗岩。先前的研究表明，每个花岗岩都有一个简单的，一步一步的岩浆演化。来自泰国的花岗岩和片麻岩的原位LA-MC-ICP-MS U-Pb锆石年代测定揭示了这些岩石的演化：中部Chonburi岩体的花岗岩继承了锆石核心年龄（515 +/- 130 Ma）。花岗岩带与华欣地区的正长片原石时代（513.6 +/- 9.2 Ma）处于同一时代。泰国南部的考陶地区也有类似的寒武纪年龄。此外，从新元古代（1017 +/- 43和984 +/- 56 Ma），奥陶纪（449 +/- 26 Ma），泥盆纪（385 +/- 15 Ma），石炭纪（316 +/- 12 Ma）至二叠纪（276 +/- 31和266 +/- 12 Ma）。综上所述，这些新元古代至二叠纪的原始石器时代被解释为代表了泰国Sibumasu地层的地下室。可以区分两个岩浆锆石的生长事件：（a）241.8 +/- 8.2至235 +/- 12 Ma和（b）230.6 +/- 3.4至213.4 +/- 3.0 Ma。我们得出的结论是，三叠纪期间的锡布马苏和印度支那的碰撞引起了锡布马苏地层花岗岩的两步岩浆演化。中三叠纪的第一次岩浆结晶与Sibumasu和印度支那的碰撞相对应，三叠纪晚期的第二岩浆结晶与晚期碰撞有关。

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    《Journal of Asian earth sciences》 |2020年第1期|104148.1-104148.17|共17页
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  • 作者单位

    Chulalongkorn Univ Fac Sci Dept Geol Basin Anal & Struct Evolut Special Task Force Act Bangkok 10330 Thailand;

    Univ Vienna Dept Lithospher Res Althanstr 14 A-1090 Vienna Austria;

    Karl Franzens Univ Graz Inst Earth Sci Univ Plaz 2 A-8010 Graz Austria;

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  • 正文语种 eng
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  • 关键词

    Zircon; U-Pb ages; Two-step granitic magmatism; Sibumasu; Thailand;

    机译：锆石U-Pb年龄;两步花岗岩岩浆作用;西布玛苏;泰国;

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