| 二叠纪末扬子海盆及其周缘动物群的 特征和古地理、古构造启示 |
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| 引用本文： | 何卫红,张克信,吴顺宝,冯庆来,杨廷禄,乐明亮,肖异凡,吴会婷,张阳.二叠纪末扬子海盆及其周缘动物群的 特征和古地理、古构造启示[J].地球科学,2015,40(2):275-289. |
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| 作者姓名： | 何卫红 张克信 吴顺宝 冯庆来 杨廷禄 乐明亮 肖异凡 吴会婷 张阳 |
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| 作者单位： | 中国地质大学生物地质与环境地质国家重点实验室,湖北武汉430074 2.中国地质大学地球科学学院,湖北武汉430074 3.山东省日照市国土资源局,山东日照276826 |
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| 基金项目： | 国家自然科学基金项目(No.41372030)中国地质调查局项目(Nos.1212011220529,12120113012500). |
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| 摘 要： | 二叠纪-三叠纪之交生物灭绝主要受古环境演变的控制.然而,古地理、古构造背景和生物自身因素(如生物的生理特
征)也影响着生物的演化规律及空间分布.从沉积学、放射虫古测深以及生物组合等方面对扬子海盆及其周缘的古地理特征进
行了详细研究,重建其古地理和古构造背景,为华南古-中生代之交生物和环境演化的全球可对比性提供了古地理依据.研究
表明:(1)扬子海盆北缘,从南往北,水体逐渐变深,面向东秦岭-大别深海;扬子海盆南缘深水盆地,从北往南,水体也是逐渐
变深,面向古特提斯洋盆.扬子海盆边缘面向广海表明扬子海盆二叠纪末生物和环境演化具有区域上广泛的代表性甚至全球
意义.(2)扬子海盆北缘盆地的古水深普遍小于南缘深水盆地的古水深.(3)华北板块与华南板块的最终碰撞发生在二叠纪以
后;钦防地区晚古生代为洋盆环境(古特提斯的分支小洋盆),该洋盆一直延续到二叠纪末甚至三叠纪,因此,扬子和华夏古构
造体系西南段的最终碰撞和拼合可能发生在二叠纪末甚至三叠纪.
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| 关 键 词： | 沉积学 放射虫动物群 生物组合 古地理 二叠纪 扬子海盆及其周缘 |
End-Permian Faunas from Yangtze Basin and Its Marginal Region:Implications for Palaeogeographical and Tectonic Environments |
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| Abstract: | The Permian-Triassic mass extinction was contro11ed by the palaeoenvironment evolution. However, the palaeogeo-
graphic feature, tectonic setting and biota physio1ogica1 feature also influenced the biotic evolution and their spatia1 ranges. To
reconstruct the palaeogeographica1 features of the basin, we conduct research on thelatest Permian sedimentary feature, radio-
1arian palaeobathymetry and biota of northern and southern parts of Yangtze Basin, It is proposed that the water depth in-
creased towards northern margin of the basin in the north part of the Yangtze Basin, facing the northern margin of the Yangtze
Basin and opening to the eastern Qinling-Dabie deep sea; whereas the water depth increased towards southern margin of the ba-
sin in the south part of the Yangtze Basin, facing the southern margin of the Yangtze Basin and opening to the Paleotethys
Ocean. The evolution of organisms and environments of the Yangtze Basin during the Permian waslinked to the counterpart in the Paleotethys and is therefore, not a1oca1 episode separated from other parts of the world, and rather representative in a re-
giona1 scale or even in the world. In addition, the water depth in the north part of the Yangtze Basin was sha11ower than that in
the south part. It is also suggested that the co11ision between the north part of South China B1ock and the North China B1ock
happened after the End-Permian. The fina1 co11ision between the Yangtze B1ock and the Cathay Accreting B1ock happened at the
end of the Permian or even Triassic a1ong the southwestern part, based on that it was deposited in a setting of ocean during the
Late Palaeozoic in the area oi Qinzhou-Fangcheng and such a setting continued to the End-Permian or even to the Triassic. |
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| Keywords: | sedimentology radiolarian biotic assemblages palaeogeography Permian Yangtze Basin and its marginal region |
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