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首页> 外文期刊>Geoscience frontiers >Characterization of the proto-Philippine Sea Plate: Evidence from the emplaced oceanic lithospheric fragments along eastern Philippines
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Characterization of the proto-Philippine Sea Plate: Evidence from the emplaced oceanic lithospheric fragments along eastern Philippines

机译：原始菲律宾海板块的特征：来自菲律宾东部沿岸的大洋岩石圈碎片的证据

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摘要

The proto-Philippine Sea Plate (pPSP) has been proposed by several authors to account for the origin of the Mesozoic supra-subduction ophiolites along the Philippine archipelago. In this paper, a comprehensive review of the ophiolites in the eastern portion of the Philippines is undertaken. Available data on the geology, ages and geochemical signatures of the oceanic lithospheric fragments in Luzon (Isabela, Lagonoy in Camarines Norte, and Rapu-Rapu island), Central Philippines (Samar, Tacloban, Malitbog and Southeast Bohol), and eastern Mindanao (Dinagat and Pujada) are presented. Characteristics of the Halmahera Ophiolite to the south of the Philippines are also reviewed for comparison. Nearly all of the crust-mantle sequences preserved along the eastern Philippines share Early to Late Cretaceous ages. The geochemical signatures of mantle and crustal sections reflect both mid-oceanic ridge and supra-subduction signatures. Although paleomagnetic information is currently limited to the Samar Ophiolite, results indicate a near-equatorial Mesozoic supra-subduction zone origin. In general, correlation of the crust-mantle sequences along the eastern edge of the Philippines reveal that they likely are fragments of the Mesozoic pPSP.
机译：几位作者提出了原始菲律宾海床（pPSP），以解释菲律宾群岛中生代超俯冲蛇绿岩的起源。本文对菲律宾东部的蛇绿岩进行了全面综述。吕宋岛（伊莎贝拉，北卡马里内斯的拉贡诺伊和拉普-拉普岛），菲律宾中部（萨马尔，塔克洛班，马里特博格和东南薄荷岛）和棉兰老岛东部（迪纳加特）的岩石圈碎片的地质，年龄和地球化学特征的可用数据和Pujada）。还对菲律宾南部的Halmahera蛇绿岩的特征进行了比较。菲律宾东部沿线保存的几乎所有地壳幔序列都具有早白垩纪至晚白垩纪。地幔和地壳剖面的地球化学特征既反映了洋中脊和超俯冲特征。尽管古磁信息目前仅限于Samar蛇绿岩，但结果表明近赤道中生代超俯冲带起源。通常，沿菲律宾东部边缘的地幔幔序列的相关性表明它们很可能是中生代pPSP的片段。

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