Turnover of Larger Benthic Foraminifera during the Paleocene-Eocene Stratigraphic Boundary in
详细信息
- 责任者：Wang Xi (School of Earth Science and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Wan Xiaoqiao
- 刊名：Acta Micropalaeontologica Sinica
- 出版年：2010
- 卷期：27(2)
- 关键词：古新世 ; Paleocene ; 始新世 ; Eocene ; 有孔虫类 ; foraminiferas ; 西藏 ; Tibet
- 页码：p.109-117
- 图表：4 illus., 2 tables, 46 refs.
- 分类号：1200
- issnNo：ISSN1000-0674
- isbnNo：CN32-1189/Q
摘要
Research on larger foraminifera fauna, carbon isotopes and oxygen isotopes in the section of ZongpuⅡshows that the signals of global Paleocene-Eocene boundary event are well recorded in the region. At the P/E boundary, the larger benthic foraminifera were extensive extincted with a general extinction rate of 71%. Following the event, larger benthic foraminifera began to recovery with the rate of 72%. SBZ4 fauna was replaced by SBZ5—SBZ13 fauna, as characterized by the gradual extinction of Paleocene taxa such as Miscellanea miscella, Lockhartia haimei, Glomalveolina primaeva and disappearance of Operculina in the Zongpu Formation and the rise of Eocene taxa Nummulites willcox, Alveolina ellipsoidalis and Orbitolites complanatus in the Zhepure Formation. A clear negative carbon isotope shift is recorded at the boundary with the value of-7.9‰ and is well correlated with other standard isotopic event. The change of oxygen isotope is different with global change, probably caused by the diagenesis.