地学前缘 ›› 2015, Vol. 22 ›› Issue (3): 99-117.DOI: 10.13745/j.esf.2015.03.009

• 中国东部盆地形成动力学环境与构造演化 • 上一篇    下一篇

白垩纪松辽盆地：从火山裂谷到陆内拗陷的动力学环境

王璞珺, 赵然磊, 蒙启安, 瞿雪姣, 朱德丰, 高有峰   

  1. 吉林大学 地球科学学院, 吉林 长春 130061 2. 大庆油田有限责任公司 勘探开发研究院, 黑龙江 大庆 163712 3. 吉林大学 古生物学与地层学研究中心, 吉林 长春 130026
  • 收稿日期:2014-06-26 修回日期:2014-11-02 出版日期:2015-05-15 发布日期:2015-05-15
  • 作者简介:王璞珺(1959—)，男，教授，博士生导师，主要从事盆地地质和油气地质研究与教学。E-mail:wangpj@jlu.edu.cn
  • 基金资助:

    国家重点基础研究发展计划“973”项目(2012CB822000)；国家自然科学基金项目(41202072)

The Cretaceous Songliao Basin: Dynamic background from volcanic rift to interior sag basin.

 WANG  Pu-Jun, DIAO  Ran-Lei, MENG  Qi-An, JI  Xue-Jiao, SHU  De-Feng, GAO  Wei-Feng   

  • Received:2014-06-26 Revised:2014-11-02 Online:2015-05-15 Published:2015-05-15

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摘要：

基于科探井等新成果，从全球构造盆地分类和松辽盆地成因类型综述入手，通过区域构造背景和盆地构造充填特征分析，研究松辽盆地类型、构造演化和地球动力学。松辽盆地位于蒙古—华北板块东北部边缘带，其北部通过蒙古—鄂霍茨克缝合带与西伯利亚板块相连，东部通过锡霍特—阿林构造带与太平洋板块相连。其形成演化受这两个活动陆缘带的影响。营城组和嫩江组顶部的2个区域性不整合面把松辽盆地分成3个构造层：断陷层(火石岭组—营城组)、拗陷层(登娄库组—嫩江组)和反转层(四方台组—依安组)。前者属火山裂谷盆地，后两者为陆内拗陷盆地。断陷期150~110 Ma，在北部与东部两个活动陆缘带共同作用下，板块重组导致区域性伸展和大规模裂陷，形成同裂谷期火山沉积序列。后裂谷期110~79.1 Ma沉积，是火山期后热沉降与区域走滑拉分沉降叠加的结果，其沉降速率高沉积厚度大，因此形成大规模烃源岩沉积。挤压反转期79.1~40 Ma，表现为沉积沉降中心向西北迁移和盆地逐渐萎缩消亡，是白垩纪中期至中始新世太平洋板块向欧亚大陆边缘近于正向俯冲、区域挤压的结果。

关键词: 晚中生代松辽盆地；火山裂谷陆内拗陷；华北西伯利亚太平洋板块；西拉木伦河&mdash, 蒙古&mdash, 鄂霍茨克&mdash, 锡霍特&mdash, 阿林缝合带

Abstract:

On the basis of the new results of the CCSD (China Cretaceous Continental Scientific Drilling) and the integrated information concerning tectonic basin classification and 3D description of the Songliao Basin (SB), we reevaluate the type, tectonic evolution, and geodynamics of the SB according to systematical analysis of tectonic setting and basin fillings. The SB is on the northeast marginal zone of MongoliaNorth China Plate. It is united with the Siberian Plate by the MongoliaOkhotsk suture belt to the north, and connected with the Pacific Plate by SikhoteAlin accretionary belt to the east. The vertical filling successions of the SB can be subdivided into three tectonostratigraphic units by two regional unconformities which are on the top boundaries of the Yingcheng (K1y) (ca. 110 Ma) and Nenjiang (K2n) (ca. 79.1 Ma) Formations, respectively. The three tectonostratigraphic units are block faulting (Huoshiling to Yingcheng Formations), interior sag (Denglouku to Nenjiang Formations), and structural inversion (Sifangtai to Yian Formations) sequences. The block faulting sequence is a kind of volcanic rift basin, and the latter two all belong to the type of interior sag basin. In the block faulting period (150110 Ma), synrift volcanogenic successions were formed under the impact of regional extension that may be caused by the Plate reorganization from two sides, the northern and eastern active continental margins. The postrift basin fills (11079.1 Ma) may result from the superimposed subsidence of both post volcanic thermal declining and regional strikeslip pullapart effect. Widespread and thick source rocks deposited because of the high rate and undercompensation of sedimentation in this period. In the structural inversion period (79.140 Ma), depocenter of the SB migrated northwestward, and the basin was shrinking to demise. This was a result of the regional compression that should be caused by the Pacific Plate subduction under the eastern margin of the Eurasian Plate in the MidCretaceous to the Middle Eocene.

Key words: Late Mesozoic Songliao Basin, volcanic rift/interior sag basin, North China/Siberian/Pacific Plate, Xilamulun River/SikhoteAlin/MongoliaOkhotsk suture belt

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