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| 论文编号: |
20120039 |
| 论文题目: |
Magnetostratigraphy of the Suerkuli Basin indicates Pliocene (3.2 Ma) activity
of the middle Altyn Tagh Fault, northern Tibetan Plateau |
| 英文论文题目: |
Magnetostratigraphy of the Suerkuli Basin indicates Pliocene (3.2 Ma) activity
of the middle Altyn Tagh Fault, northern Tibetan Plateau |
| 第一作者: |
常宏 |
| 英文第一作者: |
Chang, Hong |
| 联系作者: |
常宏 |
| 英文联系作者: |
Chang, Hong |
| 外单位作者单位: |
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| 发表年度: |
2012 |
| 卷: |
44 |
| 期: |
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| 页码: |
169-175 |
| 摘要: |
The left-lateral strike-slip Altyn Tagh Fault (ATF) forming the northern boundary of the Tibetan Plateau
accommodates parts of the overall convergence between the colliding Indian and Eurasian plates. Precise
dating of the ATF activity is essential for understanding possible mechanisms of Tibetan Plateau deformation
and uplift. Here we report a magnetostratigraphic study of the Suerkuli Basin deposits recording
depositional changes during the ATF activity. Field investigations reveal a remarkable and widespread
change in depositional environment in the Suerkuli Basin, i.e. a transformation from low-energy lacustrine
deposits (grayish-green mud-siltstone and brown mud-siltstone) into high-energy alluviul fan
deposits (poorly sorted gray pebble and cobble conglomerates). Detailed magnetostratigraphy of the
390-m-thick Daban section, at the southeastern margin of the Suerkuli Basin (38 43.090N, 90 58.840E),
shows that this change in depositional facies occurred at 3.2 Ma, accompanied by a remarkable increase
in sediment accumulation rate. We attribute this depositional change to the Piocene tectonic activity of
the middle ATF although the contribution of the Pliocene global climate deterioration cannot be excluded. |
| 英文摘要: |
The left-lateral strike-slip Altyn Tagh Fault (ATF) forming the northern boundary of the Tibetan Plateau
accommodates parts of the overall convergence between the colliding Indian and Eurasian plates. Precise
dating of the ATF activity is essential for understanding possible mechanisms of Tibetan Plateau deformation
and uplift. Here we report a magnetostratigraphic study of the Suerkuli Basin deposits recording
depositional changes during the ATF activity. Field investigations reveal a remarkable and widespread
change in depositional environment in the Suerkuli Basin, i.e. a transformation from low-energy lacustrine
deposits (grayish-green mud-siltstone and brown mud-siltstone) into high-energy alluviul fan
deposits (poorly sorted gray pebble and cobble conglomerates). Detailed magnetostratigraphy of the
390-m-thick Daban section, at the southeastern margin of the Suerkuli Basin (38 43.090N, 90 58.840E),
shows that this change in depositional facies occurred at 3.2 Ma, accompanied by a remarkable increase
in sediment accumulation rate. We attribute this depositional change to the Piocene tectonic activity of
the middle ATF although the contribution of the Pliocene global climate deterioration cannot be excluded. |
| 刊物名称: |
Journal of Asian Earth Sciences |
| 英文刊物名称: |
Journal of Asian Earth Sciences |
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| 影响因子: |
2.152 |
| 第一作者所在部门: |
古环境室 |
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