| 鄂西黄龙期有孔虫组合（带）及其与马鞍煤系富煤带分布规律的关系 |
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| 引用本文：.1984.The Foraminifera Assemblages (Zones) In The Huanglong Formation, West Hubei And Their Indication Significance For The Distribution Of Coal-Rich Zone In The Ma' An Coal Series[J].Mineral Deposits,3(3):85~94 |
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| The Foraminifera Assemblages (Zones) In The Huanglong Formation, West Hubei And Their Indication Significance For The Distribution Of Coal-Rich Zone In The Ma' An Coal Series |
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| Abstract:A great abundance of foraminiferas- fusulinids and nonfusuline foramimferas-occur in Upper Carboniferous Huanglong Formation, west Hubei. Their rapid ecologic evolution resulted in an apparent zonation. Consequently, three major foraminifera assemblages (zones) and two subzones can be established; they are numbered in downward succession: 3.Beedeina-Fusulina zone. b. Fusulitta qttasicylindfica subzone; a. Baedetna konnoi subzone. 2. Fusulinella schwagerinoides- Staffalla pseudosphaerozdea subzone. l. Tolypanmina assemblage. The Huanglong Formation has undergone erosion and thus left four types of sections containing different foraminifera assemblages (zones). They are: 1. T type: only the lowest portion of the Huanglong Formation remains, which contairis To;ypamtnina assemblage. 2. T-F-S type: characterized by Tolyparnmina assemblage and Fusuli-nella schwagerinoides-Staffella pseudosphaeroidea zone. 3. T-B type: extending from the strata containing Tolypanrnina to those containing Beedeina konnoi subzone. 4. T-F type: where the Huanglong Formation has been preserved intact and the whole foraminifera sequence-from Tolypam7nina assemblage to Fusulina quasicylitdrica subzone-has been recorded. The regional correlation of foraminifera assemblages (zones) reveals the uplift and depression previous to the formation of Lower Permian Ma'an coal series. This topography affected the sedimentation of the coal series: the coalrich zone occurs invariably in the depression. An examination of the four types of relic foraminifera assemblages (zones) furnishes further information concerning the relative position, shape, size as well as the variation regularity of the thick coal seam. |
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