论文部分内容阅读
深海钻探揭示的古新统—始新统界线上许多全球性变化引起了地质学家的普遍关注。这些变化包括：岩性上从海绿石石英砂岩变化到粘土岩、粘土矿物组合从伊利石／蒙脱石为主变化为高岭石为主、大陆植物群的绝灭和迁移、钙质超微化石物种更新速度加快、底栖有孔虫绝灭和分异度降低、碳氧同位素强烈负异常、大陆哺乳动物演化发生变化、大气环流强度减弱、海洋环流模式改变、海平面上升、海底热液活动呈１～２个数量级加强。通过对古新世—始新世的地层沉积学、古生物学、古气候学和古海洋学研究，确认古新统—始新统地层界线是全球构造事件的结果，表现为全球板块边界重组、扩张中心和转换断层模式改变、海底热液活动呈１～２个数量级加强。
Many of the global changes in Paleocene-Eocene strata revealed by deep-sea drilling arouse the general attention of geologists. These changes include: lithology from the chlorophyllite quartz sandstone to clay rock, clay mineral assemblage from illite / montmorillonite mainly to kaolinite, the extinction and migration of the mainland flora, calcareous ultra Micro-fossil species renewed faster, extinction and differentiation of benthic foraminifera decreased, carbon and oxygen isotopes were strongly negative anomalies, the evolution of mammals in the continent changed, the intensity of atmospheric circulation decreased, the mode of ocean circulation changed, the sea level rose, and the seafloor heat Liquid activity was 1 to 2 orders of magnitude to strengthen. Through the study of Paleocene-Eocene stratigraphic sedimentology, paleontology, palaeoclimate and paleoceanography, it is confirmed that the Paleocene-Eocene stratigraphic boundary is the result of global tectonic events, manifested as the reorganization of global plate boundaries, The expansion center and transformation fault pattern changed, and the seafloor hydrothermal activity increased by 1 to 2 orders of magnitude.