| Permo-Triassic Magnetostratigraphy in Wulong Area, Sichuan, China |
| |
| 作者姓名： | 陈海泓 孙枢 李继亮 FriedrichHeller JonDobson Friedrich Heller and Jon Dobson |
| |
| 作者单位： | Laboratory of Lithosphere Tectonic Evolution，Institute of Geology，Academia Sinica，Beijing 100029，PRC)，Laboratory of Lithosphere Tectonic Evolution，Institute of Geology，Academia Sinica，Beijing 100029，PRC)，Laboratory of Lithosphere Tectonic Evolution，Institute of Geology，Academia Sinica，Beijing 100029，PRC)，Swiss Federal Institute of Technology，CH-8093 Zurich，Switzerland，Swiss Federal Institute of Technology，CH-8093 Zurich，Switzerland，Swiss Federal Institute of Technology，CH-8093 Zurich，Switzerland) |
| |
| 基金项目： | This project was supported by both the National Natural Science Foundation of China and the Swiss Federal Institute of Technology. |
| |
| 摘 要： | The Permo-Triassic boundary in Wulong area, Sichuan Province, South China lies in a continuous marine carbonate succession with abundant fossil records. Two well-exposed sections were sampled for magnetostratigraphic studies. The experimental results of rock magnetism reveal that the samples from the Triassic limestones contain only magnetites among which 70% are multi-domain. The ChRM direction is carried by remaining 30% of single-domain magnetite. The Permian limestone samples are dominated by single-domain to superparamagnetic magnetites with little ChRM direction due to their fine-grained texture. Nevertheless, the polarity determination is still possible based on the NRM vector changes during thermal demagnetization. A Permo-Triassic polarity profile in Wulong area is established in the paper, and a tentative correlation with other known profiles is pursued. The authors suggest that the Illawarra reversal starts at the upper part of Wujiapingian, while some normal polarity events may exist in the
|
Permo-Triassic Magnetostratigraphy in Wulong Area, Sichuan, China |
| |
| CHEN Hai-Hong,SUN Shu LI Ji-Liang.Permo-Triassic Magnetostratigraphy in Wulong Area, Sichuan, China[J].Science in China(Chemistry),1994(2). |
| |
| Authors: | CHEN Hai-Hong SUN Shu LI Ji-Liang |
| |
| Abstract: | The Permo-Triassic boundary in Wulong area, Sichuan Province, South China lies in a continuous marine carbonate succession with abundant fossil records. Two well-exposed sections were sampled for magnetostratigraphic studies. The experimental results of rock magnetism reveal that the samples from the Triassic limestones contain only magnetites among which 70% are multi-domain. The ChRM direction is carried by remaining 30% of single-domain magnetite. The Permian limestone samples are dominated by single-domain to superparamagnetic magnetites with little ChRM direction due to their fine-grained texture. Nevertheless, the polarity determination is still possible based on the NRM vector changes during thermal demagnetization. A Permo-Triassic polarity profile in Wulong area is established in the paper, and a tentative correlation with other known profiles is pursued. The authors suggest that the Illawarra reversal starts at the upper part of Wujiapingian, while some normal polarity events may exist in the Kiaman Epoch. |
| |
| Keywords: | Permo-Triassic rock magnetism polarity profile |
| 本文献已被 CNKI 等数据库收录！ |
