| Cyclostratigraphy of the Induan (Early Triassic) in West Pingdingshan Section,Chaohu,Anhui Province |
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| 作者单位： | GUO Gang,TONG JinNan,ZHANG Jie(GPMR and BGEG Laboratories at China University of Geosciences, Wuhan 430074, China);ZHANG ShiHong,BAI LingYan(School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China) |
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| 基金项目： | the project of the Ministry of Science and Technology，the National Natural Science Foundation of China，the National Basic Research and Development Program |
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| 摘 要： | 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.
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| 收稿时间： | 8 February 2007 |
| 修稿时间： | 25 September 2007 |
Cyclostratigraphy of the Induan (Early Triassic) in West Pingdingshan Section, Chaohu, Anhui Province |
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| Authors: | GUO Gang TONG JinNan ZHANG ShiHong ZHANG Jie BAI LingYan |
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| Institution: | 1. GPMR and BGEG Laboratories at China University of Geosciences, Wuhan 430074, China
2. School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | 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 geological 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.
Supported by the project of the Ministry of Science and Technology (Grant No. 2006FY120300-11), the National Natural Science
Foundation of China (Grant Nos. 40325004, 40621002), and the National Basic Research and Development Program (Grant No. 2006CB80640) |
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| Keywords: | Induan cyclostratigraphy magnetic susceptibility spectral analysis wavelet analysis Chaohu Anhui Province |
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