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首页> 外文期刊>Journal of Asian earth sciences >Significance of indigenous Eocene larger foraminifera Discocyclina dispansa in Western Foothills, Central Taiwan: A Paleogene marine rift basin in Chinese continental margin
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Significance of indigenous Eocene larger foraminifera Discocyclina dispansa in Western Foothills, Central Taiwan: A Paleogene marine rift basin in Chinese continental margin

机译：台湾中部西部丘陵地区始新世较大的有孔虫Discocyclina dispansa的意义：中国大陆边缘的古近纪海洋裂谷盆地

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摘要

The Western Foothills of Taiwan was known to be composed of Late Oligocene to Pleistocene shallow marine strata continuously deposited on the stable passive Chinese continental margin without significant stratigraphic break. Here we present multiple micropaleontological evidences, including occurrence of larger foraminifera Discocyclina dispansa ex. interc. sella-dispansa and calcareous nannoplanktons, to show that there are Middle Eocene marine strata (first named as the Chungliao Formation) exposed in the Tsukeng anticline of the Western Foothills, central Taiwan. Occurrences of intact tests with thin delicate outer rims and well-preserved embryonic chambers suggest that the Discocyclina dispansa ex. interc. sella-dispansa (Lutetian to Bartonian in the Tethys region) are buried indigenously on shallow inner shelf during an episodic transgression in the Early Middle Eocene. The conclusion is consistent with a biostra-tigraphy study of calcareous nannoplanktons (Zones NP14-15) in the shale/sandstone alternations overlying the Discocydina-bearing bed of the Chungliao Formation and calcareous nannofossils of Zone NP16 integrated with an age dating of 38.8 ± 1 Ma (Late Middle Eocene) on zircon grains of the overlying Ping-lin Tuff. The Middle Eocene syn-rift sequences (Chungliao Formation and Pinglin Tuff) exposed along the Tsukeng anticline are unconformably covered by the latest Oligocene-Miocene post-rift sequence, a scenario similar to what have been drilled in the East China Sea-Taiwan Strait-South China Sea. This rift basin (named as the Nantou Basin) is sitting on the Peikang Basement High margin which further extends southwestward to the Central Uplift of the Pearl River Mouth Basin in the northern slope of the South China Sea. The present work documents a hitherto unknown occurrence of the exposed early Tertiary marine rift basin sequence in the Western Foothills of Taiwan. The study extends our knowledge of the Western Foothills geohistory from the Late Oligocene downward to the Early Middle Eocene. The occurrence of the Paleogene Nantou rift basin in the Western Foothills may also suggest that there could have similar Paleogene rift sequences exposed in other parts of the Taiwan mountain belt like the Hsueh-shan Range and the Central Range east of the Western Foothills.
机译：众所周知，台湾西部丘陵地带是由渐新世至更新世的浅海地层组成，这些浅海地层连续沉积在稳定的被动中国大陆边缘，没有明显的地层破裂。在这里，我们介绍了多种微古生物学证据，包括较大的有孔虫Discocyclina dispansa ex的发生。际sella-dispansa和钙质纳米浮游生物，表明在台湾中部西山麓的Tsukeng背斜上有始新世中海相地层（第一个被命名为Chungliao组）。完整测试中出现了薄而细腻的外缘和保存完好的胚胎腔，这表明Discocyclina dispansa ex。际sella-dispansa（特提斯地区的鲁特语至巴托尼亚语）在始新世中期发生的偶发性海侵中被固有地埋在浅内架上。该结论与页岩/砂岩交替中的钙质纳米浮游生物（Zones NP14-15）的生物地层学研究相吻合，该页岩/砂岩交替覆盖在Chongliao组含Discocydina床层和NP16区的钙质纳米化石中，年龄为38.8±1 Ma（晚中始新世）覆盖在平林凝灰岩的锆石颗粒上。新近的渐新世-中新世后裂谷序列不整合地覆盖了沿始坑背斜暴露的中新世同裂谷序列（中辽组和坪林凝灰岩），这种情况类似于在东海-台湾海峡-南中国海。这个裂谷盆地（被称为南投盆地）位于北北向北延伸到珠江口盆地中央隆升的北北向北的佩康基底高边缘上。本工作记录了台湾西山麓地区迄今未知的第三纪早期海洋裂谷盆地序列的发生。该研究将我们对西山丘陵地貌的知识从渐新世晚期向下延伸到中新世早期。西山麓的古近纪南投裂谷盆地的出现也可能暗示在台湾山地带的其他地区，如雪山山脉和西山麓以东的中部山脉，也可能有类似的古近纪裂谷序列。

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  • 来源
    《Journal of Asian earth sciences》 |2013年第30期|425-437|共13页
  • 作者

    Chi-Yue Huang; Yi Yen; Ping-Mei Liew; Dai-Jie He; Wen-Ron Chi; Min-Shyan Wu; Meixun Zhao;

  • 作者单位

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China,Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan;

    Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan;

    Department of Geosdences, National Taiwan University, Taipei, Taiwan;

    Department of Geosdences, National Taiwan University, Taipei, Taiwan;

    Department of Geosdences, National Taiwan University, Taipei, Taiwan;

    Exploration and Development Research Institute, Chinese Petroleum Corporation, Taiwan, Miaoli, Taiwan;

    Key Laboratory of Marine Chemistry Theory and Technology of the Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, China;

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  • 正文语种 eng
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  • 关键词

    discocyclina; western foothills; eocene rift basin; break-up unconformity; Taiwan;

    机译：discocyclina;西山麓;始新世裂谷盆地分手不合格;台湾;

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