中国地震学会会员 南黄海中部隆起二叠纪-三叠纪菊石的发现及其意义

本文关键词： 大陆架科学钻探 菊石 吴家坪阶 格里斯巴赫阶 南黄海出处：《海洋地质与第四纪地质》2017年03期论文类型：期刊论文

【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1 475.2m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851.9m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 scientific drilling of CSDP-2 well on the continental shelf is the only deep drilling in the middle uplift of South Huang Hai, which reveals the Meso-Paleozoic marine stratigraphic epoch。 Permian to Triassic is an important paleontology in indicating stratigraphic age and restoring paleogeographic environment。 There are many chrysanthemum fossils found in the core of CSDP-2 well, two of which are of great significance。 The Roadoceras cf。sinense age, taken from the 14475。中国地震学会会员2m core, was identified as the Roadianan-Wujiaping stage of the Permian Rhode stage。

Wuchiapingian。 It belongs to the genus Roadoceras, which has been established in recent 20 years。 Its paleogeographic distribution is located in the paleoequator and double temperature region。 The samples found this time come from the northern margin of South China。 The paleogeographic distribution of the genus has been expanded。 In addition, Ophiceratidae has been found in the core of 851。9 m。 It is an early Triassic Griesbachian molecule and is very close to the bottom of the Triassic system。