胶莱盆地白垩系林寺山组砾岩沉积特征及盆地演化意义

发布时间：2018-03-18 14:54

本文选题：胶莱盆地　切入点：白垩系　出处：《沉积学报》2016年01期 　论文类型：期刊论文

【摘要】：胶莱盆地下白垩统莱阳群底部林寺山组主要由砾岩组成。通过对盆地及周缘18个地点林寺山组砾岩系统的调查,从砾岩组分、砾径和长轴排列方向的统计分析出发,研究该砾岩沉积相类型、盆地物源区、古水流及林寺山组上覆地层中砂岩碎屑锆石U-Pb年龄谱特点,并进一步讨论了盆地演化的意义。研究表明,林寺山组底部砾岩以冲积扇相为主,但不同地点亚、微相类型又有差异。原型胶莱盆地由莱阳、海阳—即墨和诸城—五莲3个独立盆地组成,被6个隆起区所分隔。莱阳盆地的物源主要来自胶北隆起和苏鲁造山带北部;海阳—即墨盆地以苏鲁造山带北部隆起区、即墨—牟平隆起、胶南隆起为主物源区;诸城—五莲盆地以胶南隆起和马山—李党家低隆起为主要物源区。林寺山组砾岩的出现标志着苏鲁造山带大规模塌陷和胶莱盆地的形成。
[Abstract]:The Linsishan formation at the bottom of the Lower Cretaceous Laiyang Group in Jiaolai Basin is mainly composed of conglomerates. Based on the investigation of the conglomerate system of the Linsishan formation in 18 locations of the basin and its periphery, the statistical analysis of the conglomerate composition, gravel diameter and the direction of the long axis arrangement is carried out. The sedimentary facies type of the conglomerate, the source area of the basin, the paleocurrent and the U-Pb age spectrum of sandstone zircon in the overlying strata of the Linshishan formation are studied, and the significance of the basin evolution is discussed. The bottom conglomerate of Linsishan formation is mainly alluvial fan facies, but the microfacies types are different in different locations. The prototype Jialai basin is composed of three independent basins: Laiyang, Haiyang-Jimo and Zhucheng Wulian. The provenance of the Laiyang basin is mainly from the northern Jiaobei uplift and the northern Sulu orogenic belt, and the Haiyang-Jimo basin is dominated by the northern uplift of the Sulu orogenic belt, the Jimo-Muping uplift, and the main provenance of the Jiaonan uplift. In Zhucheng-Wulian basin, Jiaonan uplift and Mashan-Lidujia low uplift are the main source areas. The occurrence of conglomerate in Linsishan formation marks the large-scale collapse of Sulu orogenic belt and the formation of Jiaolai basin.
【作者单位】：中国地质科学院地质研究所;中国地质大学(北京)地球科学与资源学院;中国海洋石油总公司湛江分公司;
【基金】：国家自然基金项目(41272021;41372109;90914003) 中国地质调查局项目(1212011085477;12120114064301)~~
【分类号】：P534.53

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