地学前缘 ›› 2021, Vol. 28 ›› Issue (4): 299-315.DOI: 10.13745/j.esf.sf.2020.7.3

• 非主题来稿选登 • 上一篇    下一篇

松辽盆地及周缘地区侏罗系/白垩系界线区域对比特征探讨

瞿雪姣1(), 高有峰2,*(), 林志成1, 王璞珺3, 吴康军1   

  1. 1.重庆科技学院 石油与天然气工程学院, 重庆 401331
    2.吉林大学 东北亚生物演化与环境教育部重点实验室, 吉林 长春 130026
    3.吉林大学 地球科学学院, 吉林 长春 130061
  • 收稿日期:2020-01-05 修回日期:2020-03-27 出版日期:2021-07-25 发布日期:2021-07-25
  • 通讯作者: 高有峰
  • 作者简介:瞿雪姣(1986—),男,博士,讲师,主要从事大陆科学钻探和石油地质研究。E-mail: quxuejiao2008@aliyun.com
  • 基金资助:
    国家自然科学基金重大项目(41790453);重庆市基础科学与前沿技术研究专项(cstc2017jcyjAX0456);重庆科技学院校内科研基金项目(CK2016B15);重庆科技学院校内科研基金项目(CK2017zkyb008)

Discussion on the characteristics of the Jurassic-Cretaceous boundary correlation in the Songliao Basin and adjacent areas

QU Xuejiao1(), GAO Youfeng2,*(), LIN Zhicheng1, WANG Pujun3, WU Kangjun1   

  1. 1. School of Petroleum and Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
    2. Ministry of Education Key Laboratory for Evolution of Past Life and Environment in Northeast Asia, Jilin University, Changchun 130026, China
    3. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2020-01-05 Revised:2020-03-27 Online:2021-07-25 Published:2021-07-25
  • Contact: GAO Youfeng

摘要:

松辽盆地及周缘地区是白垩纪时期全球最大的陆地出露区,是开展陆相J/K界线研究的理想地区。但是,受制于盆内埋深大、盆缘露头出露不佳等原因,松辽盆地及周缘地区J/K界线发育区域及层段仍然存在较大争议。同时,对于陆相J/K界线划分与对比这样的重大疑难问题,其研究很难一步到位。总结一套影响广泛、区域对比性强的J/K界线区域对比框架性特征,可以有效聚焦目标区域和层段,为进一步的精细研究明确方向。系统梳理松辽盆地及周缘典型地区J/K界线上下地层中记录的区域构造背景、岩浆事件和生物宏观演化阶段可发现:(1)松辽盆地以西和以南地区晚侏罗世为块体碰撞后陆壳加厚坍塌或拆沉的伸展环境,早白垩世为推覆陆壳加厚坍塌或拆沉的伸展环境;松辽盆地晚侏罗世为碰撞后持续造山环境,早白垩世为双侧活动陆缘影响下的区域性伸展-裂陷环境;松辽盆地以东地区晚侏罗世—早白垩世可能为走滑构造背景。(2)松辽盆地及周缘地区晚侏罗世—早白垩世生物演化阶段表现为晚侏罗世燕辽生物群的衰落和白垩纪热河生物群的兴起,其中晚侏罗世孢粉组合以裸子植物花粉占绝对优势、高Classopollis含量为特征,早白垩世则以松柏类两气囊花粉占绝对优势、低Classopollis含量为特征。(3)冀北—辽西地区的土城子组、黑龙江东部的东安镇组和东荣组应是J/K界线进一步工作的重点层段,大兴安岭地区的满克头鄂博组、松辽盆地常家围子断陷及其以西至大兴安岭局部地区可以尝试开展J/K界线研究工作。

关键词: 侏罗系/白垩系界线, 构造背景, 生物宏观演化, 松辽盆地及周缘地区

Abstract:

The Songliao Basin and adjacent areas, one of the largest Cretaceous sedimentary landmass, is an excellent candidate for recovering a complete terrestrial sedimentary record from the top of the Upper Jurassic to the Cretaceous. However, the Jurassic-Cretaneous (J/K) boundary bearing areas and beds in the region have not been confirmed because of discontinuous outcrops and deep burial depth. It is important to note that the terrestrial J/K boundary division and correlation is a complex issue with no quick solutions. A set of framework characteristics of inter-region correlation need to be devised. In this report, we discuss the framework characteristics of the J/K boundary correlation in the Songliao Basin and adjacent area and summarize the basis of tectonic setting, magmatic events and biotic macroevolution from the Late Jurassic to the Early Cretaceous. The region west and south of the Songliao Basin has a post-collision extensional setting related to the closure of the Mongol-Okhotsk Ocean in the Jurassic, and an extensional setting in the Cretaceous caused by continental crustal thickening and delamination related to N-S thrust. The Songliao Basin was in a post-collision orogeny setting related to the closure of the Mongol-Okhotsk Ocean in the Jurassic, and in an extensional setting in the Cretaceous caused by plate reorganization involving the active northern and eastern continental margins. The region east of the Songliao Basin was in a strike-slip setting from the Late Jurassic to the Early Cretaceous. The Yanliao and Jehol Biotas are two big fossil groups representing the Jurassic and the Cretaceous, respectively. The Jurassic palynological assemblage is dominated by gymnosperm pollens with high abundance of Classopollis, while the Cretaceous one is dominated by bisaccate pollens of conifers with low Classopollis abundance. The Tuchengzi Formation in northern Hebei and western Liaoning, the Donganzhen Formation in Raohe, and the Dongrong Formation in Suibin are the most probable J/K boundary bearing beds. The J/K boundary may also present in the Daxing’anling Manketouebo Formation, Changjiaweizi Fault Depression and the area between the Changjiaweizi Fault Depression and Daxing’anling.

Key words: Jurassic/Cretaceous boundary, tectonic setting, biotic macroevolution, Songliao Basin and adjacent areas

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