DISCOVERY OF PERMIAN-TRIASSIC AMMONOIDS IN THE CENTRAL UPLIFT OF THE SOUTH YELLOW SEA AND ITS GEOLOGICAL IMPLICATIONS
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摘要:
大陆架科学钻探CSDP-2井，是南黄海中部隆起上的唯一深钻，是揭示中-古生代海相地层时代，恢复沉积和构造环境的基准井。菊石是二叠纪至三叠纪的重要古生物，在指示地层时代和恢复古地理环境方面，都具有重要价值。在CSDP-2井岩心中发现多块菊石化石，其中的两块化石具有重要意义。根据菊石形态特征，取自1 475.2 m岩心中的Roadoceras cf. sinense 时代被鉴定为二叠纪罗德阶(Roadian)—吴家坪阶(Wuchiapingian)，属于近20年来建立起来的菊石属Roadoceras，其古地理分布位于古赤道及双温区，此次发现的样品则来自华南北缘，拓展了该属的古地理分布范围。另外，在851.9 m处岩心中，发现了蛇菊石Ophiceratidae，其为早三叠世格里斯巴赫阶(Griesbachian)分子，非常接近三叠系的底部，为CSDP-2井二叠纪和三叠纪界线的划分提供了重要证据。上述菊石的发现，有助于厘定南黄海中部隆起二叠系-三叠系海相地层发育时代，恢复古地理环境，亦为南黄海进一步的沉积、构造和油气资源研究奠定重要基础。
Abstract:The Borehole CSDP-2 of the Continental Shelf Drilling Program (CSDP) is the only deep hole ever drilled on the central uplift of the South Yellow Sea (SYS). As a reference well, it is critical important to the dating of marine Paleo-Mesozoic deposits and reconstruction of the paleo-environmental pattern and paleo-tectonic settings of the SYS region. Ammonites are recognized as excellent index fossils for approaching the above objectives. So far, many ammonite fossils have been found in the core of CSDP-2, of which two, namely Roadoceras cf. sinense and Ophiceratidae, are specifically significant. The fossil of Roadoceras cf. sinense was discovered at the depth of 1475.2 meters. It is an index fossil distributed from Late Roadian to Wuchiapingian temporally and in the palaeoequatorial and bi-temperate regions spatially. The new finding of Roadocerascf. sinense from CSDP-2 extended the distribution area of this genus to the further north. On the other hand, Ophiceratidae, which is found at a depth of 851.9 meters and belongs to Griesbachian, is very close to the bottom of Triassic, and valuable for study of Permian and Triassic boundary. The discovery of the ammonites is important for confirming the stratigraphic age of the Permian and Triassic marine formations on the central uplift of the SYS region, recovering the paleo - environmental pattern, and providing the foundation for the future study of sedimentation, tectonic and petroleum resources.
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Key words:
- South Yellow Sea /
- Continental Shelf Drilling Program /
- Ammonoid /
- Wuchiapingian /
- Griesbachian
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