古新世—始新世界线的全球事件

doi:10.11867/j.issn.1001-8166.1996.03.0288

地球科学进展 ›› 1996, Vol. 11 ›› Issue (3): 288 -293. doi: 10.11867/j.issn.1001-8166.1996.03.0288

古新世—始新世界线的全球事件

王成善，刘志飞

成都理工学院成都 610059

收稿日期:1995-05-22 修回日期:1995-09-18 出版日期:1996-05-01
通讯作者: 王成善，男，1951年11月出生，教授，主要从事沉积盆地分析及环境沉积学研究。

GLOBAL EVENTS AT THE PALEOCENE-EOCENE BOUNDARY

Wang Chengshan; Liu Zhifei

Chengdu Institute of Technology, Chengdu 610059

Received:1995-05-22 Revised:1995-09-18 Online:1996-05-01 Published:1996-05-01

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深海钻探揭示的古新世－始新世界线许多全球性变化引起了地质学家的普遍关注。这些变化表现在岩性、粘土矿物组合、大陆植物群、大陆哺乳动物、钙质超微化石、底栖有孔虫、氧碳同位素、大气环流强度、海洋环流模式、海平面等方面。通过对古新世－始新世地层沉积学、古生物学、古气候学和古海洋学的研究，确认古新世－始新世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、海底热液活动是一至二个数量级加强。

关键词: 古新世, 始新世, 界线, 全球事件, 构造

Lots of global changes at the Paleocene-Eocene boundary, Which were discovered by Deep Sea Drilling Project and which have been attracting geologists’ s attention, include: a change in lithology from glauconitic quartz sand to clay; a change in clay mineral suites from illite/smectite-dominated to kaolinite-dominated; the extinction and migration in the terrestrial flora; an increased species turnover rate in marine calcareous nanofossils; the extinction and lower diversity in the benthic foraminiferal assemblages; a considerable excursion in δ18O and δ13C values; a change in the evolution of land mammals; a significant reduction of the intensity of atmospheric circulation; a change in the style of abyssal circulation; an increase in water depth; and one to two order of magnitude increase in hydrothermal activity at the Paleocene-Eocene boundary. The Paleocene-Eocene boundary was the result of global tectonic events by researching lithology, palaeobiology, palaeoclimatology, palaeoceanography of the Paleocene-Eocene stratigraphic sections. The events include that global plate boundary rearrangement, changes in patterns of spreading centers and transform faults, and increase in hydrothermal activity.

Key words: Paleocene, Eocene, Boundary, Global event, Tectonics

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