Evidence for the Jurassic arc volcanism of the Lolotoi complex, Timor: Tectonic implications

Seung-Ik Park; Sanghoon Kwon; Sung Won Kim

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Evidence for the Jurassic arc volcanism of the Lolotoi complex, Timor: Tectonic implications

机译：帝汶洛洛托伊复合体的侏罗纪弧形火山的证据：构造意义

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摘要

We report the first sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon ages with geochem-ical data from metavolcanic rocks in the Lolotoi complex, Timor. The zircon U-Pb ages of two andesitic metavolcanic rocks yield a permissible range of the Middle Jurassic extrusion from 177 Ma to 174 Ma. The geochemical data indicate that the origins of the basaltic and andesitic metavolcanic rocks are products of prolonged oceanic crust and arc magmatism, respectively. They are originated from partial melting of lherzolites, providing an insight into the tectonic evolution of the forearc basements of the Banda volcanic arc. Thus, parts of the Banda forearc basement are pieces of allochthonous oceanic basalts and Jurassic arc-related andesites accreted to the Sundaland during the closure of Mesotethys, and are incorporated later into the Great Indonesian Volcanic Arc system along the southeastern margin of the Sundaland.

机译：我们报告了第一批敏感的高分辨率离子微探针（SHRIMP）U-Pb锆石年龄，以及来自帝汶Lolotoi复杂中变火山岩的地球化学数据。两个安第斯中期火山岩的锆石U-Pb年龄产生了从177 Ma到174 Ma的中侏罗统挤压的允许范围。地球化学数据表明，玄武质和安第斯中期火山岩的起源分别是延长的洋壳和弧岩浆作用的产物。它们起源于锂铁矿的部分熔融，提供了对班达火山弧前臂基底的构造演化的见解。因此，班达前陆地下室的一部分是在中土构造闭合期间沉积到the他达兰的异质海洋玄武岩和与侏罗纪弧有关的安山岩，后来沿Sun他达兰的东南边缘并入大印尼火山弧系。

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来源
《Journal of Asian earth sciences》 |2014年第1期|254-265|共12页
作者
Seung-Ik Park; Sanghoon Kwon; Sung Won Kim;
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作者单位

Geological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea;

Department of Earth System Sciences, Yonsei University, Seoul 120-749, Republic of Korea;

Geological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea;

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正文语种 eng
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Lolotoi complex; Timor; Middle Jurassic; Metavolcanic rock; Jurassic oceanic and arc volcanisms; Banda arc;

机译：洛洛托瓦情结;帝汶;中侏罗纪;火山岩;侏罗纪的海洋和弧形火山活动;班达弧;

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Evidence for the Jurassic arc volcanism of the Lolotoi complex, Timor: Tectonic implications

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