先锋盆地超厚优质煤层的异地成因模式

Genetic Model about the Extra-Thick and High Quality Coalbed in Xianfeng Basin,Yunnan Province,China

云南先锋盆地赋存有超厚的优质褐煤。煤层中发育有着丰富的异地成因的沉积学标志。这些成因标志揭示了一种新的异地堆积亚模式,即“腐植型植物碎屑河流远源搬运→植物碎屑扇三角洲沉积+湖滨泥炭沼泽植物碎屑沉积+泥质碎屑沉积→洪水或水下重力流的混合和搬运作用→有机碎屑与无机碎屑的机械分异和再沉积”,简称为“湖相植屑扇三角洲-水下重力流二次堆积”,或者“先锋亚模式”。这种亚模式补充了作者原先所建立的中国中、新生代内陆断陷盆地超厚煤层的成因模式———“阜新亚模式”和“抚顺亚模式”,可以统称为“异地-微异地湖泊二次复合堆积模式”。

There are extra-thick high quality coal for liquidation oil in the Xianfeng basin, Yunnan Province, China There are abundant sedimentary marks of allochthonous genesis in the extra-thick coalbeds. These genetic indicators reveal two new submodels about allochthonous accumulation ： that is, ＂the river distant transport of plant detritus→the sedimention of plant detritus fan delta or plant detritus delta ＋ the allochthonous sedimention of lacustrine drift plant detritus ＋ the hypautochthony accumulation of local lakeshore swamp peat ＋ the autochthonous accumulation of local lacustrine algae peat ＋ the sedimention fine detritus→the mix and transport because of flood current or weak storm flow or underwater gravity flow→the mechanical differentiation and resedimentation of plant detritus and inorganic detritus＇ , can be recapitulated. It can be deduced to the twice accumulation of lacustrine plant detritus fan delta and underwater gravity flow＇ or be reduced to Xianfeng submodel＇. This submodel supplements the allochthonous-hypautochthony lacustrine combination accumulation model＇ of the extra-thick coalbeds of Fuxin submodel and Fushun submodel in Chinese Mesozoic and Cenozoic intracontinental fault basin.