山东平邑盆地PYZK01钻孔白垩系—古近系界线附近生物地层及磁性地层特征研究
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本文为中国地质调查局项目“山东古近系地层划分对比研究”(编号:1212011120146)和山东省重大创新工程“深地资源勘查开采”专项“山东东部海域日青威盆地油气赋存条件研究”(编号:2017CXGC1608)、“沂沭断裂带深部结构及对资源环境的影响”(编号:2017CXGC1602)、山东省地勘资金项目“山东省古生物化石普查(化石产地)”、山东省自然科学基金博士基金项目“鲁西地区寒武纪—奥陶纪转折期地层中生命微量元素的含量分布规律及其生物响应”(编号:ZR2018BD011)的成果。


Study on biostratigraphic and magnetostratigraphic characteristics near the Cretaceous—Paleogene boundary in the Drill PYZK01 in the Pingyi Basin, Shandong Province
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    摘要:

    在白垩纪与古近纪之交,全球发生了以恐龙集群灭绝和哺乳动物兴起为代表的重大事件,白垩系与古近系界线(Cretaceous—Paleogene boundary, KPB)研究成为热点。虽然近年来KPB研究取得了重要进展,但许多非海相地层领域的重要问题并未得到解决,因此建立非海相白垩系—古近系界线层型很有必要。山东平邑盆地的卞桥组为一套连续的湖相碳酸岩沉积,在前人大量研究基础上认为其是进行非海相KPB研究的理想地层单元之一。本文通过对平邑卞桥镇佟家庄北PYZK01钻孔的生物地层研究,获得了丰富的古生物化石,根据其分布特征建立了1个Porochara anluensis—Chara yuntaishanensis var. acuta—Turbochara specialis轮藻化石组合,1个Deltoidospora adriensis—Rugubivesiculites—Schizaeoisporites孢粉化石组合,认为该钻孔0~12. 25 m地层时代为古近纪,37. 80~60. 00 m地层时代为晚白垩世最晚期。12. 25~37. 80 m地层时代为晚白垩世—古近纪过渡段,白垩系—古近系界线存在于该段。通过磁性地层研究,确立了8个正极性带和7个反极性带,建立了钻孔磁极性序列,并提出了与国际标准的磁极性年代柱的对比方案。同时,经过探讨初步认为PYZK01钻孔中的白垩纪/古近纪界线位于孔深31. 98 m处的卞桥组一段内。

    Abstract:

    Objectives: At the turn of the Cretaceous and the Paleogene, major events represented by the extinction of dinosaur clusters and the rise of mammal happened across the globally, and the Cretaceous—Paleogene boundary is research hotspot. Even though important progress has been made in KPB research in recent years, but many important problems in the nonmarine strata has not been solved, so it is necessary to establish a nonmarine Cretaceous—Paleogene boundary (KPB) stratotype. Methods: On the basis of the field work and the research of predecessors, biostratigraphic and magnetic stratigraphic studies were carried out on the Drill PYZK01 in the Pingyi Basin, Shandong Province, a scientific drill. Results: We obtained a rich fossil of paleontology, and according to its distribution characteristics, established one charophyte assemblage: Porochara anluensis—Chara yuntaishanensis var. acuta—Turbochara specialis, one sporopollen assemblage: Deltoidospora adriensis—Rugubivesiculites—Schizaeoisporites. Through the research on the magnetostratigraphy, 8 positive polarity zones and 7 reversed polarity zones are established, and the magnetic polarity sequences of the borehole is built. Conclusions: From the biostratigraphic study of the Drill PYZK01, we consider that the stratigraphic age from 0 to 12.25 m is Paleogene, the stratigraphic age from 37.8 m to 60 m is the latest stage of Late Cretaceous; and the stratigraphic age from 12.25 m to 37.8 m is the transition from Late Cretaceous to Paleogene, the Cretaceous—Paleogene boundary should exist in this part. Based on the magnetostratigraphic study, we proposed a comparison plan with the latest Geomagnetic Polarity Time Scale. At the same time, it is preliminarily suggested that the Cretaceous—Paleogene boundary should be located at 31.98 m of the first member of the Bianqiao Formation in the core.

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陈军,杜圣贤,刘凤臣,陈诚,宋香锁,杨斌,高黎明,梁吉坡,仵康林,田兴磊.2020.山东平邑盆地PYZK01钻孔白垩系—古近系界线附近生物地层及磁性地层特征研究[J].地质论评,66(3):570-590,[DOI].
CHEN Jun, DU Shengxian, LIU Fengchen, CHEN Cheng, SONG Xiangsuo, YANG Bin, GAO Liming, LIANG Jipo, WU Kanglin, TIAN Xinglei.2020. Study on biostratigraphic and magnetostratigraphic characteristics near the Cretaceous—Paleogene boundary in the Drill PYZK01 in the Pingyi Basin, Shandong Province[J]. Geological Review,66(3):570-590.

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  • 收稿日期:2019-05-31
  • 最后修改日期:2020-01-23
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  • 在线发布日期: 2020-05-18
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