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东海陆架盆地瓯江凹陷明月峰组沉积相及沉积特征分析

Keywords: 物源分析,沉积相,沉积特征,明月峰组,瓯江凹陷

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Abstract:

?通过岩心观察描述,综合测井、录井、古生物、重矿物等资料,结合地震相分析,以瓯江凹陷构造演化及相对海平面变化为主线,从物源分析出发,综合分析瓯江凹陷明月峰组沉积相类型及沉积特征。晚古新世明月峰组沉积期,瓯江凹陷处于断拗转换阶段,沉积物源由凹陷西侧的闽浙隆起带酸性火山岩源区和凹陷东侧的雁荡低凸起提供,以闽浙隆起带物源占绝对优势,受中古新世至晚古新世中期大规模海侵的影响,相对海平面持续升高,凹陷东侧雁荡低凸起开始接受沉积,使得凹陷沉积范围达到断陷期最大,总体呈滨海—浅海沉积,闽浙隆起带物源供应充分,在凹陷西缓坡发育3个大型三角洲沉积,滨海沉积发育于凹陷西缘三角洲之间及雁荡低凸起位置,凹陷中央发育大范围的浅海沉积。控制明月峰组各沉积相空间展布的主控因素是构造和相对海平面变化,以相对海平面变化为主。

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