湖沉积;湖相沉积
Evaluation of Soil Physical Environment Quality in Lacustrine Deposit Waterlogged Land of Jianghan Plain
江汉平原湖积型涝渍地土壤物理环境质量评价
During the initial stage of coal measures deposition, was mainly alluvial fan deposit, middle stage lake delta deposit and later stage lacustrine deposit. Most coal seams in Yanan Formation were formed in peaty moors on lake delta plain.
煤系沉积初期,以河流及冲积扇沉积为主,沉积中期则以湖泊三角洲沉积为主,晚期以湖泊环境为主,延安组各煤层大多是在湖泊三角洲平原上泥沼化形成的。
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