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The species diversity of fusulinaceans and high-frequency sea-level changes in the Carboniferous-Permian boundary section at Xikou, Zhen'an County,Shaanxi Province,{1.

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Science china Earth Sciences 2006年第7期49卷 673-683页

作者： zhang haijun1, wang xunlian2, ding lin1,{3., chinese academy of Sciences, beijing 100085, china 2. Faculty of Earth Sciences and Mineral Resources, china University of Geosciences, beijing 100083. china 3. Tianjin institute of Geology and Mineral Resources, Tianjin 3.0170, china 1. institute of {1. {3. research Chinese Academy of Sciences Beijing 100085 China 2. Faculty of Earth Sciences and Mineral Resources China University of Geosciences Beijing 100083 China 3. Tianjin institute of Geology and Mineral Resources Tianjin 300170 China

The study on the interrelation between sea-level changes and biodiversity with its evolu-tion has great significance for understanding the impact of global changes on organic evolution and exploring the inherent laws of life-environment coevolution in geological history. In this paper, the stratigraphic distribution of fusu{1.acean fauna in the Carboniferous-Permian boundary section at Xikou, Zhen’an County, Shaanxi Province, is analyzed quantitatively, and the relationship between the species diversity of fusu{1.aceans and relative sea-level changes is discussed. As a whole, the spe-cies numbers of fusu{1.acean fauna experience a rapid increase and an obvious dec{1.e in Xikou, Zhen’an County, from the Late Carboniferous to the Early Permian. There is a significant increase in species diversity around the Carboniferous-Permian boundary, which is one of the biggest bio-events of the fusu{1.acean fauna, and represents the radiation of Pseudoschwagerininae subfamily in the studied area. Integrated fusu{1.acean species diversity into sequence stratigraphic framework, de-tailed study suggests that the species diversity of the fusu{1.aceans is closely related to its relative stratigraphic location, and is essentially controlled by the sea-level changes, especially by the high-frequency sea-level changes. Generally, the species diversity of fusu{1.aceans is low, and the number of first and last appearance datum is small in the lower unit of high-frequency depositional cycle formed during the quick rise of the sea level; whereas the species diversity of fusu{1.aceans is high, and the number of first and last appearance datum is large in the upper unit of high-frequency cycle formed during the slow fall of the sea level. Within the third-order depositional sequence, the species diversity of the fusu{1.aceans at the first flooding surfaces and the maximum flooding surfaces is low, and it increases upward. The fusu{1.acean species diversity is low within the transgressive syst

关键词： fusulinaceans, species diversity, high-frequency cyclothem, sequence stratigraphy, sea-level changes, Carboniferous-Permian boundary, Zhen'an, Shaanxi.

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