何丽娟2,3,4
1. 中国地震局地质研究所, 北京 100029
2. 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029
3. 中国科学院地球科学研究院, 北京 100029
4. 中国科学院大学, 北京 100049
基金项目: 国家自然科学基金项目(41704087, 41574075)和国家重点研发计划项目(2016YFC0601005)联合资助
详细信息
作者简介: 刘琼颖, 女, 1988年生, 博士, 助理研究员, 主要从事沉积盆地、岩石圈构造-热演化数值模拟研究.E-mail:liuqiongying@ies.ac.cn
中图分类号: P314 收稿日期:2018-11-06
修回日期:2018-12-06
上线日期:2019-01-05
Tectono-thermal modeling of the Bohai Bay Basin since the Cenozoic
LIU QiongYing1,,HE LiJuan2,3,4
1. Institute of Geology, China Earthquake Administration, Beijing 100029, China
2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
4. University of Chinese Academy of Sciences, Beijing 100049, China
MSC: P314
--> Received Date: 06 November 2018
Revised Date: 06 December 2018
Available Online: 05 January 2019
摘要
摘要:渤海湾盆地是华北最大的新生代裂谷盆地，具有最完整的新生代地层记录，是研究盆地演化的理想区域.本文基于二维多期拉张模型，对渤海湾盆地内9条地震解释剖面进行新生代构造-热演化模拟，以揭示盆地拉张强度及热演化的时空差异性，为探讨盆地演化的地球动力学机制提供依据.研究结果表明：渤海湾盆地各坳陷新生代期间的总拉张系数为1.28~2.39，渤中坳陷和辽东湾坳陷的总拉张系数最大，而辽河坳陷和临清坳陷的拉张系数最小.盆地基底热流在古近纪中、晚期达到峰值71~100 mW·m-2，之后逐渐降低至现今.盆地西部热流峰期出现的时间早于东部.由盆地拉张系数和基底热流的研究结果得出，渤海湾盆地新生代的拉张有着自西向东，自南向北的迁移，与沉积、沉降中心的迁移方向一致.太平洋板片新生代期间的幕式向东后撤可能是造成渤海湾盆地幕式拉张及拉张中心向东迁移的主要动力学机制.
关键词: 渤海湾盆地/
新生代/
构造-热演化模拟/
热流/
构造演化/
太平洋板块俯冲
Abstract:The Bohai Bay Basin (BBB) is the largest Cenozoic rifted basin with the most complete Cenozoic succession compared to other basins in North China. Therefore, it is an ideal region for studying basin evolution. In this paper, tectono-thermal modeling is performed along nine seismic profiles of the BBB to reveal the spatial and temporal differences of the extension intensity and thermal evolution, which can provide evidence for the geodynamic mechanism of basin evolution. The modeling results show that the total stretching factors for different depressions in the BBB range from 1.28 to 2.39, with the largest value in the Bozhong and Liaodong Bay depressions and the minimum in the Liaohe and Linqing depressions, respectively. The basin basement heat flow reached its peaks during the middle-late Paleogene with values of 71~100 mW·m-2, and then the basin cooled down during the remaining Cenozoic era. The arrival of heat flow peak was earlier in the west than that in the east of the basin. The modeling results of the extension factor and basement heat flow indicate that the stretching center of the BBB migrated from west to east and from south to north during the Cenozoic, which is consistent with the migration of the depocenters and subsidence centers. We infer that the episodic eastward retreat of the Pacific slab might be the main dynamic mechanism for the episodic extension and eastward migration of stretching centers in the basin.
Key words:Bohai Bay Basin/
Cenozoic/
Tectono-thermal modeling/
Heat flow/
Tectonic evolution/
Pacific Plate subduction
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