Discovery of Cool-Water Deep-Water Facies Invertebrates of the Latest Permian from Youjiang Basin,South China and the Geological Significance
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摘要: 对右江盆地二叠纪末腕足类和介形虫的全球古地理分布以及其他海相无脊椎动物的组合特征进行了详细研究,发现该盆地多个门类生物和华南其他地区(尤其是扬子海盆)存在明显差异。腕足类和介形虫有一部分为凉水分子或古冷水圈分子,具有冷水与暖水分子混生的特征;放射虫具有远洋生物组合的特征;双壳类含大量土著种。这些特征表明:二叠纪末,右江盆地水体相当深,为半深海-深海环境,水温较凉,适合于凉水分子生存;右江盆地和扬子西缘的古特提斯洋连通,是古特提斯洋伸向华南盆地的边缘盆地。Abstract: This paper systematically studied the global distribution of the latest Permian brachiopods and ostracods found in the Youjiang Basin and the palaeoecological feature of other invertebrates and some differences have been recognized between the faunas from Youjiang Basin and Yangtze Basin.Brachiopods and ostracods from Youjiang Basin include abundant cool-water/palaeopsychrospheric elements,characterized by the cool-water and warm-water mixed faunas.Other invertebrates are partly characterized by pelagic elements(radiolarians)or endemic elements(bivalves).These facts indicate that the Youjiang Basin was typical of bathyal to abyssal setting and linked to the Palaeotethys Ocean.
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Key words:
- cool-water element /
- Latest Permian /
- Youjang Basin
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