珠一坳陷古近纪物源特征及其沉积演化:来自碎屑锆石年龄的指示
阙晓铭 , 舒誉 , 汪旭东 , 雷永昌 , 王宇辰 , 吴琼玲
地球科学 ›› 2024, Vol. 49 ›› Issue (07) : 2373 -2387.
珠一坳陷古近纪物源特征及其沉积演化:来自碎屑锆石年龄的指示
Provenance Characteristics and Sedimentary Evolution of Zhu I Depression in Paleogene: Indications from Detrital Zircon Ages
珠一坳陷古近系裂陷过程中的沉积演化一直缺乏系统认识.采用碎屑锆石U-Pb定年方法,对珠一坳陷4个凹陷内的钻井古近系文昌组和恩平组砂岩开展“源‒汇”对比分析,解析其不同演化阶段年代学、物源特征及沉积演化等信息.结果显示珠一坳陷断陷期不仅接受盆内低凸起区、隆起区剥蚀的碎屑物质,还受到盆外北部古水系长距离搬运的陆源碎屑的影响.其中,始新世文昌组沉积物以盆内短程物源为主,年龄谱系除陆丰凹陷还表现出加里东期‒燕山期多峰态外,在各凹陷均以燕山期单峰为特征,洼陷沉积区周缘隆起的中生代岩浆岩、中生界沉积岩地层及新生代火山岩构成该时期湖盆的物质来源;恩平组沉积物在恩平北部和惠州西部率先接受华南水系沉积物影响,在恩平组沉积晚期珠一坳陷普遍接受了来自华南隆褶带的物质输入,年龄谱系呈现以燕山‒印支‒加里东期为主的多峰特征,出现晋宁期、元古代、新太古代的古老年龄,指示珠一坳陷的物源结构发生重大变化,即由盆内古隆起物源转变为盆内和盆外造山带双重物源,该时期沉积体系以大型浅水三角洲为特征.
碎屑锆石U-Pb / 物源转换 / 珠一坳陷 / 古近纪 / 石油地质.
detrital zircon U-Pb / provenance transformation / Zhu I depression / Paleogene / petroleum geology
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国家科技重大专项(2016ZX05024-002-008)
中海油“十三五”科技重点项目(CNOOC-KJ135ZDXM37SZ)
中海油“十四五”重大科技项目(KJGG-2022-0301)
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