| 鄂西、湘西北二叠纪(竹蜓)类的古地理分区及其意义 |
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| 引用本文：林甲兴.1985.鄂西、湘西北二叠纪(竹蜓)类的古地理分区及其意义[J].地球学报,7(1):103-112. |
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| 中文摘要:本文论述了鄂西、湘西北地区N-Y生态区和C-G-P生态区的分布和意义。N-Y生态区在该区主要分布于湖南大庸茅岗至四川石柱一线,长约200公里、宽约10—15公里呈北西向的窄长条带。本文以实际资料论证了N-Y生态区的生态环境以及这一环境的古地理特征,认为N-Y生态区实际上为鄂西、湘西北地区上、下二叠统间成煤期之前聚煤凹陷的主要分布地带。因此,N-Y生态区及其周缘地带应为该区煤田预测与勘探的主要方向。该成煤期之后,鄂西、湘西北地区晚二叠世的C-G-P生态区分布在一定条件下继承了N-Y生态区的范围,并且具有大致相同的生态环境和条件,因此对C-G-P生态区分布范围的研究也将有助于在它生存之前聚煤凹陷分布规律的研究。 |
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| THE DIVISION OF PALEOGEOGRAPHIC AREAS OF PERMIAN FUSULINIDS IN WESTERN HUBEI AND NORTHWESTERN HUNAN AND THEIR SIGNIFICANCE |
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| Abstract:Permian fusulinid faunas in western Hubei and northwestern Hunan not only show distinct zoning in vertical section (see Table 1), but laterally there are also appreciable changes in fusulinid assemblages.It is particularly the case with the fusulinid fauna represented by the Neoschwagerina and Yabeina zones in the upper part of the Maokou Formation, which is regionally confined to a definite areal extent, designated by the author the Neoschwagerina-Yabeina ecotope (ecological group) (called the N-Y ecotope for short). The N-Y ecotope covers a northwest-trending narrow region approximately 10-15 km wide and 200 km in length from Maogang, Dayong, Hunan, to Shizhu, Sichuan. In this paper, the author expounds with concrete materials the ecological environment of the N-Y ecotope and the paleogeo-graphic features of this environment, and concludes that the N-Y ecotope was actually the main part of the coal-accumulating depression that had existed prior to the coal-accumulating stage between the Upper and Lower Permian in western Hubei and northwestern Hunan. Hence the N-Y ecotope and its surrounding areas should be considered to be the main direction of coalfield prediction and exploration in the region. After the coal-accumulating stage, the lateral distribution of the Late Permian fusulinid zones of Codonofusiella, Gallowayinella and Palaeofusulina sinensis (in ascending order) also had a definite areal extent, designated in this paper the Codonofusiella-Gallowayinella-Palaeofusulina sinensis ecotope (ecological group) (called the C-G-P ecotope for short) . The areal extent of the C-G-P ecotope inherited that of the N-Y ecotope under certain conditions, and both show roughly the same ecological environment and conditions; therefore the study of the areal extent of the C-G-P ecotope will also contribute to the study of the regularity governing the distribution of the coal-accumulating depression prior to its existence. |
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