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首页> 外文期刊>Journal of Asian earth sciences >The oleaginous Botryococcus from the Triassic Yanchang Formation in Ordos Basin, Northwestern China: Morphology and its paleoenvironmental significance
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The oleaginous Botryococcus from the Triassic Yanchang Formation in Ordos Basin, Northwestern China: Morphology and its paleoenvironmental significance

机译：中国西北鄂尔多斯盆地三叠系延长组含油葡萄球菌：形态学及其古环境意义

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摘要

High abundance but rather low diversity algal fossils were found in the hydrocarbon source rocks of the Ch 7-2-Ch 7-3 section, Triassic Yanchang Formation in the Xifeng area of southwest Ordos Basin, which are mainly composed of prolific Leiosphaeridia and Botryococcus. Botryococcus colonies are of various forms; the majority is nubbly, with some of cluster and cotton shape. The nubbly colonies appear globular, cordiform, ternate petal, obtuse triangle, chrysanthemum shape and so on. Most Botryococcus are saffron or brown and are frequently covered with clay under transmission microscope, and shows strong yellow and light brown under fluorescence microscope. Botryococcus could live in freshwater and brackish water. The Botryococcus colonies that lived in fresh water are small with small single cells arranged radially, with undulant or indented edges. The Botryococcus colonies that lived in brackish water are bigger, with larger single cells arranged irregularly, with slippery contours. The most of Botryococcus are discovered from the organic-rich argillaceous sediment with abundant pyrites in the semi- and deep-lake facies, and shows they were preserved in low-energy reducing environments. Taphonomic characteristics of various microfossils and the present of Pediastrum in the phytoplankton flora indicate that they are in situ or near burial. The lake area of the Ordos Basin was gradually expanding and reaching its most extensive flood surface in the Ch 7 of Yanchang Formation interval during the Middle and Late Triassic, with warm climate, plentiful rainfall, and luxuriant vegetation, as determined by the environmental analysis with Botryococcus in Xifeng area. The presence of two ecological types of Botryococcus indicates that the salinity of lake water was fluctuating in the Ch 7 interval. The occurrence of symbiotic acritarchs and geochemical salinity indices show that the Ordos Lake was a typical fresh-water lake, which was gradually desalted, and its salinity fluctuation was narrow during the Mid-Later Triassic. The ecological type of the palynological flora discovered from the Ch 7 to Ch 8 in Xifeng area is similar to that from the Fuxian Lake, with abundant Botryococcus in the Yungui Plateau of China. These findings imply that the Ordos Basin was in a lower-latitude area of temperate to subtropical climate during the Middle and Late Triassic.
机译：在鄂尔多斯盆地西南部西峰地区三叠系延长组Ch 7-2-Ch 7-3剖面烃源岩中发现了高丰度，低多样性的藻类化石，主要由多产的白鳞球菌和葡萄球菌组成。葡萄球菌菌落具有多种形式。多数为成虫，具簇状和棉花状。呈核状菌落，呈球状，绳状，花瓣状，钝角三角形，菊花形等。大多数葡萄球菌为藏红花或棕色，在透射显微镜下经常被粘土覆盖，在荧光显微镜下显示为强黄色和浅棕色。葡萄球菌可以生活在淡水和微咸水中。生活在淡水中的葡萄球菌菌落很小，放射状排列着小的单细胞，边缘呈波纹状或凹陷。生活在微咸水中的葡萄球菌菌落较大，单细胞排列不规则，轮廓光滑。大部分的葡萄球菌是从富含有机质的泥质沉积物中发现的，在半湖和深湖相中具有丰富的黄铁矿，表明它们被保存在低能耗的环境中。各种微化石的速写特征以及浮游植物群中的前鞭毛的存在表明它们位于原地或接近埋葬处。鄂尔多斯盆地的湖区在三叠纪中晚期延长期的Ch 7阶段逐渐扩展并达到最广泛的洪水面，气候温暖，雨水充沛，植被茂密，经萨尔瓦多的环境分析确定。西峰地区的葡萄球菌。两种生态类型的葡萄球菌的存在表明湖水的盐度在Ch 7间隔内波动。共生顶角和地球化学盐度指数的出现表明，鄂尔多斯湖是典型的淡水湖，逐渐淡化，盐度波动在晚三叠世中逐渐缩小。西峰地区Ch 7至Ch 8发现的孢粉菌群的生态类型与抚仙湖相似，在中国云贵高原有丰富的葡萄球菌。这些发现表明，鄂尔多斯盆地在三叠纪中晚期处于温带至亚热带气候的低纬度地区。

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  • 来源
    《Journal of Asian earth sciences》 |2010年第5期|p.175-185|共11页
  • 作者

    Li-ming Ji; Kui Yan; Fan-wei Meng; Min Zhao;

  • 作者单位

    Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, Gansu Province 730000, China;

    State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, Jiangsu Province 210008, China Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, Jiangsu Province 210008, China;

    State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, Jiangsu Province 210008, China Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, Jiangsu Province 210008, China;

    Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, Gansu Province 730000, China Graduate School of Chinese Academy of Science, Beijing 100069, China;

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  • 正文语种 eng
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  • 关键词

    ordos basin; triassic; yanchang formation; hydrocarbon source rocks; botryococcus; paleoenvironment;

    机译：鄂尔多斯盆地三叠纪延长组烃源岩葡萄球菌古环境;

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