The Intemational Symposium on Triassic Chronostratigraphy and Biotic Recovery was held in Chaohu City, Anhui Province, China on 23-25 May 2005 with about 70 colleagues from 14 countries in attendance. The symposium wa...The Intemational Symposium on Triassic Chronostratigraphy and Biotic Recovery was held in Chaohu City, Anhui Province, China on 23-25 May 2005 with about 70 colleagues from 14 countries in attendance. The symposium was co-sponsored by the Subcommission on Permian Stratigraphy, Subcommission on Triassic Stratigraphy, IGCP-467, Task Group on Induan-Olenekian Boundary, NSF-CHRONOS Project, as well as the National Natural Science Foundation of China and China National Commission of Stratigraphy. It was organized by the China University of Geosciences and hosted by the Government of Chaohu City and Office of Land and Resources, Anhui Province.展开更多
The Induan sequence in the West Pingdingshan Section, Chaohu, Anhui Province, displays a series of superimposed mudstone/limestone cycles. The lithological character of the cycles, combined with power spectral and wav...The Induan sequence in the West Pingdingshan Section, Chaohu, Anhui Province, displays a series of superimposed mudstone/limestone cycles. The lithological character of the cycles, combined with power spectral and wavelet analysis of magnetic susceptibility readings, reveals 12 short eccentricity and 56 precession Milankovitch cycles - obliquity cycles are not apparent. The uniformity of cycle thicknesses indicates a stable depositional setting making this section ideal to perform various geo-logical studies. Accordingly, the Induan Stage is estimated to have lasted 1.1 Ma, and the depositional rate for this part of the section is about 3.7 cm/ka. This places the Induan-Olenekian boundary in the West Pingdingshan Section at about 251.5 Ma based on an age of 252.6 Ma for the Permian-Triassic boundary.展开更多
文摘The Intemational Symposium on Triassic Chronostratigraphy and Biotic Recovery was held in Chaohu City, Anhui Province, China on 23-25 May 2005 with about 70 colleagues from 14 countries in attendance. The symposium was co-sponsored by the Subcommission on Permian Stratigraphy, Subcommission on Triassic Stratigraphy, IGCP-467, Task Group on Induan-Olenekian Boundary, NSF-CHRONOS Project, as well as the National Natural Science Foundation of China and China National Commission of Stratigraphy. It was organized by the China University of Geosciences and hosted by the Government of Chaohu City and Office of Land and Resources, Anhui Province.
基金the project of the Ministry of Science and Technology (Grant No. 2006FY120300-11)the National Natural Science Foundation of China (Grant Nos. 40325004, 40621002)the National Basic Research and Development Program (Grant No. 2006CB80640)
文摘The Induan sequence in the West Pingdingshan Section, Chaohu, Anhui Province, displays a series of superimposed mudstone/limestone cycles. The lithological character of the cycles, combined with power spectral and wavelet analysis of magnetic susceptibility readings, reveals 12 short eccentricity and 56 precession Milankovitch cycles - obliquity cycles are not apparent. The uniformity of cycle thicknesses indicates a stable depositional setting making this section ideal to perform various geo-logical studies. Accordingly, the Induan Stage is estimated to have lasted 1.1 Ma, and the depositional rate for this part of the section is about 3.7 cm/ka. This places the Induan-Olenekian boundary in the West Pingdingshan Section at about 251.5 Ma based on an age of 252.6 Ma for the Permian-Triassic boundary.
