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首页> 外文期刊>Journal of Asian earth sciences >Radiolarian biostratigraphic data from the Casiguran Ophiolite, Northern Sierra Madre, Luzon, Philippines: Stratigraphic and tectonic implications
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Radiolarian biostratigraphic data from the Casiguran Ophiolite, Northern Sierra Madre, Luzon, Philippines: Stratigraphic and tectonic implications

机译：菲律宾吕宋岛北部马德雷山脉卡西古兰蛇绿岩的放射虫生物地层学数据：地层学和构造学意义

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摘要

Results from the first detailed radiolarian biostratigraphic study conducted in Luzon are reported. The data were obtained from cherts associated with the Casiguran Ophiolite, a dismembered ophiolite mass consisting of serpentinized peridotites, gabbros, dolerite dikes and pillow basalts exposed along the eastern coast of the Northern Sierra Madre, Luzon, Philippines. Cherts and limestone interbeds conformably overlie the ophiolite. The radiolarian assemblages from the cherts constrain the stratigraphic range of the cherts to the Lower Cretaceous (upper Barremian-lower Aptian to Albian). This new biostratigraphic result is in contrast with the Upper Cretaceous stratigraphic range previously reported in the region. Radiolarian biostratigraphic results from the Casiguran Ophiolite provide additional evidence for the existence of Mesozoic oceanic substratum upon which Luzon and neighboring regions within the Philippine archipelago were likely built. Interestingly, the result closely resembles those reported for the ophiolite in southeastern Luzon as well as the oceanic crust of the Huatung Basin situated east of Taiwan and the ophiolites in eastern Indonesia. In light of this, along with previously gathered geochemical data from the ophiolites, a common provenance is being looked into for these crust-upper mantle sequences in the western Pacific region.
机译：据报道，在吕宋进行的第一项详细的放射虫生物地层学研究的结果。数据来自与卡西古兰蛇绿岩相关的石，这是一种由蛇纹石化的橄榄岩，辉长岩，白云母岩和枕形玄武岩组成的蛇绿石块，沿着菲律宾北部吕宋的东海岸暴露。蛇纹岩和硅质岩和石灰岩夹层一致。石的放射虫组合将con石的地层范围限制在下白垩统（上巴雷米亚-阿普提安-阿尔比安）。这一新的生物地层学结果与该地区先前报道的上白垩统地层范围形成对比。卡西古兰蛇绿岩的放射虫生物地层学结果为中生代海洋底层的存在提供了额外的证据，据此可能建立了吕宋岛和菲律宾群岛内的邻近地区。有趣的是，结果与吕宋岛东南部蛇绿岩以及台湾以东的华东盆地的洋壳和印度尼西亚东部的蛇绿岩所报告的结果极为相似。有鉴于此，再加上以前从蛇绿岩中收集到的地球化学数据，人们正在寻找西太平洋地区这些地壳上地幔序列的共同物源。

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  • 来源
    《Journal of Asian earth sciences》 |2013年第25期|131-142|共12页
  • 作者

    Karlo L. Queano; Edanjarlo J. Marquez; Jonathan C. Aitchison; Jason R. Ali;

  • 作者单位

    Earth and Materials Science and Engineering Department, Mapua Institute of Technology, Intramuros, Manila, Philippines;

    Department of Physical Sciences and Mathematics, University of the Philippines Manila, Padre Faura St., Ermita, Manila, Philippines;

    Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong Special Administrative Region,School of Geosciences, Faculty of Science, The University of Sydney, NSW 2006, Australia;

    Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong Special Administrative Region;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    radiolarians; ophiolites; luzon; early cretaceous;

    机译：放射虫蛇绿岩吕宋早白垩纪;

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