Anastomosed River Deposits of Fuxin Formation in Tiefa Basin
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摘要: 铁法盆地为晚中生代半地堑式断陷盆地，阜新组的网结河沉积发育于断裂盆缘内侧冲积扇至湖缘三角洲之间的湖退进积体系域。大量的钻孔和矿井地质资料详尽揭示了网结河道相、河岸相及湿地相的特征，其中，泥石流沉积是网结河道相的一种特殊的成因类型。在有关各成因地层单元中，以网结河沉积体系的繁盛发育为主体，以网结河沉积体系的衰退并伴随大面积泥炭沼泽化而结束。盆缘断裂活动比较活跃、盆地沉降速率大、沉积充填速率高、河道坡降小是网结河发育的重要条件。Abstract: Anastomosed river deposits of Fuxin Formation in Tiefa basin, one of the Late Mesozoic semigraben basin, are developed in the progradational system accompanied by the process of the lake reg ression betw een alluvial fa ns inside the fault of the basin edge and lake deltas. A great quantity of geological data of drillings and pits reveal the characteristics of facies of the channel, the stream bank and the wet land in the anastomosed river deposits and debris flow deposit is a particular genetic type among channel facies. The prosperous development of the sedimentary system of the anastomosed river is the main part in the genetic stratigraphic units, and the genetic stratig raphic units are ended by the decline of the sedimentary system of the anastomosed river accompanied by a great area of peaty swamp. Important conditions of the developing of the anastomosed river are frequent activity of the fault in the basin edge, large rate of the subsidence and deposit filling in the basin and small slope of channels.
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Key words:
- Tiefa basin /
- Fuxin Formation /
- anastomosed river deposits /
- coal-accumulation in wetland
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