冀中坳陷古近系沉积层序特征及其沉积体系的演化
- 中国石油大学(北京)资源与信息学院 北京 102249
- 收稿日期:
1900-01-01
- 修回日期:
1900-01-01
- 刊出日期:
2009-02-10
摘要: 冀中坳陷古近系是由平行、微角度或角度不整合面所限定的一个区域性（二级）的沉积层序，其内可划分出3个二级层序、13个三级层序和数十个四级、五级的层序单元。整体上显示为三套从水进到水退的沉积旋回，可识别出冲积扇—河流、湖泊—湖泊三角洲以及河流等三套沉积相组合。构造、气候、物源供给及湖平面的变化等各地质要素之间严格控制着坳陷内部层序的构成及其充填响应模式。构造沉降过程等分析过程揭示了沉积坳陷经历了两次沉积速率变化的演化旋回，即两个不同的沉降阶段。第一阶段为古近纪古新世的缓慢加速沉降、始新世早中期的快速沉降和始新世晚期的缓慢沉降；第二阶段为始新世末期的缓慢加速沉降、渐新世早期的快速沉降和渐新世中晚期的缓慢加速沉降。这两个阶段的演化过程沉降速率分别为100～110 m·Ma-1、205～220 m·Ma-1、40～50 m·Ma-1、30～40 m·Ma-1、135～142 m·Ma-1和10～20 m·Ma-1。古近纪扭动作用揭示了坳陷左旋运动使其雁列构造在沙四末和东营末为北北东或北东方向展布；右旋运动使其雁列构造在左旋交替过程中产生，但其产生的构造的规模要比左旋构造小得多，一般表现为北西—北北西向构造。这种扭动作用的表现形式是南北对扭，并最终造就了坳陷东西向两凹夹一隆的构造格局。
Depositional Architecture of Paleogene System Tectonic Sequences and Evolvement of Sedimentary System in Jizhong Depression
- Academy of Resources and Informatics, China University of Petroleum, Beijing 102249Academy of Resources and Informatics, China University of Petroleum, Beijing 102249
- Received Date:
1900-01-01
- Rev Recd Date:
1900-01-01
- Publish Date:
2009-02-10
Abstract: Sedimentary sequence which belongs to the second grade sequence locates among the parallel, microangular or angular unconformities, and which is divided into 3 second order sequences, 13 third order sequences and numeral fourth or fifth order sequences. There are three series of sedimentary cycles for transgression to regression, and identifying alluvial fanfluvial facies, lakedelta and fluvial facies and so on. Structure, climate, sedimentary supply and variation in lake level and so on control the depositional architecture of the Paleogene System tectonic sequences and their response to tectonism in Jizhong depression. The analysis shows that the depression suffers for two sets of evolvement gyrations attributing to variation in deposition rate. Phase 1, slowness accelerating subsidence at Paleocene in Paleogene Period, earlymediumterm speediness subsidence at Eocene Epoch and terminal slowness subsidence at Eocene Epoch. Phase 2, telophase lowness accelerating subsidence at Eocene Epoch, earlyterm speediness subsidence at Oligocene and mediumterminal slowness subsidence accelerating subsidence at Oligocene. Settlement rate partly is 100～110 m·Ma1, 205～220 m·Ma1, 40～50 m·Ma1,30～40 m·Ma1, 135～142 m·Ma1 and 10～20 m·Ma1. Wring action in Paleogene Period shows sinistral movement makes enechelon structure as causes NNE or NE orient distribution at terminal of Sha4 and Dongying member, and dextral movement is reverse. At last the depression unfolds the structure of two sunkens champing one convex.
纪友亮. 冀中坳陷古近系沉积层序特征及其沉积体系的演化[J]. 沉积学报, 2009, 27(1): 48-56.
| 引用本文: |
纪友亮. 冀中坳陷古近系沉积层序特征及其沉积体系的演化[J]. 沉积学报, 2009, 27(1): 48-56.
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JI Youliang. Depositional Architecture of Paleogene System Tectonic Sequences and Evolvement of Sedimentary System in Jizhong Depression[J]. Acta Sedimentologica Sinica, 2009, 27(1): 48-56.
| Citation: |
JI Youliang. Depositional Architecture of Paleogene System Tectonic Sequences and Evolvement of Sedimentary System in Jizhong Depression[J]. Acta Sedimentologica Sinica, 2009, 27(1): 48-56.
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