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沉积学报  2015 

再论水进型三角洲——兼论四川盆地须家河组巨厚砂层成因

DOI: 10.14027/j.cnki.cjxb.2015.05.001, PP. 845-854

Keywords: 水进河床充填砂体,水下分流河道砂,水进型三角洲

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Abstract:

上世纪80年代初笔者根据现代长江三角洲考察中发现的"海进河床充填砂体",结合其他考察资料和古代砂体特征,建立了"水进型三角洲"模式。30余年来,越来越多的资料表明这个模式是正确的。目前普遍使用的"水下分流河道",经长江三角洲、云南洱海、内蒙岱海等现代沉积考察和大量卫星照片分析表明并不存在。而据旋回地层学、层序地层学等理论分析,水进型沉积是广泛发育的,水槽模拟实验也证实有水进期三角洲发育,因此笔者认为应以水进河床砂微相取代现今普遍误用的水下分流河道砂微相。四川盆地须家河组的须二、四段巨厚且大面积分布的砂岩是由三角洲平原各分支河道(分支河道砂)、前缘河口进积型(河口坝砂)和退积型沉积(水进河床砂)反复叠加,加上河道侧向迁移摆动与各个三角洲体相互拼接连片而成的。水进型三角洲多形成于湖、海水面上升期,地壳运动、气候变化、特殊地质事件、地形地貌以及沉积速率等都可能引起水面升降,当水面上升时常常形成水进型沉积。

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