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首页> 外文期刊>Journal of Asian earth sciences >Arc and backarc geochemical signatures of the proto-Philippine Sea Plate: Insights from the petrography and geochemistry of the Samar Ophiolite volcanic section
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Arc and backarc geochemical signatures of the proto-Philippine Sea Plate: Insights from the petrography and geochemistry of the Samar Ophiolite volcanic section

机译：菲律宾原始海床的弧和弧后地球化学特征：萨马尔蛇绿岩火山岩剖面的岩石学和地球化学的见解

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摘要

Remnants of a Cretaceous lithosphere are found at the peripheries of the West Philippine Basin. These Mesozoic fragments preserve arc affinity and include the Amami Plateau, the East Halmahera Ophiolite and the ophiolites along the eastern margin of the Philippine archipelago. The eastern margin of the Philippines is composed of Early to Late Cretaceous ophiolites and ophiolitic complexes that exhibit strong subduction imprints. The early Late Cretaceous Samar Ophiolite in the central Philippines forms part of this eastern belt. Recent surveys in southern Samar revealed the presence of peridotites, gabbros, and massive and pillowed flows of the Samar Ophiolite. Major, trace and rare earth element signatures of the volcanic rock samples indicate moderate to strong subduction-related influences and formation in an island arc setting. In contrast to other similarly-aged ophiolites along the eastern margin of the archipelago, those to the north of Samar Island exhibit weak to almost mid-oceanic ridge characteristics. These differences in the geochemical signatures of the ophiolites and ophiolitic complexes along eastern Philippines require a re-evaluation of a previous model suggesting that these ophiolites originated from a single oceanic lithosphere, possibly the proto-Philippine Sea Plate. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在西菲律宾盆地的外围发现了白垩纪岩石圈的残余物。这些中生代碎片保持了弧的亲和力，包括the美高原，东哈马赫拉蛇绿岩和菲律宾群岛东缘的蛇绿岩。菲律宾的东部边缘由早白垩世至晚白垩世的蛇绿岩和蛇绿岩复合体组成，它们具有强烈的俯冲印记。菲律宾中部的早白垩世Samar Ophiolite构成了该东部地带的一部分。萨马尔南部地区的最新调查显示，橄榄岩，辉长岩以及萨马尔蛇绿岩的大量且呈枕状流动。火山岩样品的主要，痕量和稀土元素特征表明在岛弧环境中中等至强的俯冲相关影响和形成。与沿群岛东缘的其他类似年龄的蛇绿岩相比，萨马岛北部的蛇绿岩显示出弱至几乎洋中脊的特征。菲律宾东部蛇绿岩和蛇绿岩复合物在地球化学特征上的这些差异需要对以前的模型进行重新评估，表明这些蛇绿岩起源于单个海洋岩石圈，可能是原始菲律宾海床。 （C）2016 Elsevier Ltd.保留所有权利。

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