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| 论文编号: |
60 |
| 论文题目: |
Tectonic and climatic controls on provenance changes of fine-grained dust on the Chinese Loess Plateau since the late Oligocene |
| 英文论文题目: |
Tectonic and climatic controls on provenance changes of fine-grained dust on the Chinese Loess Plateau since the late Oligocene |
| 第一作者: |
Yan, Y |
| 英文第一作者: |
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| 联系作者: |
Yan Yan |
| 英文联系作者: |
Yan Yan |
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| 发表年度: |
2017 |
| 卷: |
200 |
| 期: |
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| 页码: |
110-122 |
| 摘要: |
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| 英文摘要: |
Provenance variations of Late Cenozoic aeolian deposits on the Chinese Loess Plateau (CLP) were closely associated with regional tectonic activity and climatic change. Previous studies, however, have not reached a consensus regarding the nature and origin of past variations in source. This study presents the results of oxygen isotope (delta O-18) analyses of fine-grained quartz (< 16 mu m) extracted from aeolian deposits on the CLP since the late Oligocene. The quartz delta O-18 variations exhibit distinct trends and patterns of variation over six time intervals (i.e. 25-20, 20-12, 12-7, 7-2.6, 2.6-1.2, and 1.2-0 Ma). In comparison with quartz delta O-18 results from East Asian dust sources and previous provenance studies of the same aeolian sequences, we identify three significant composition changes of the dust source system at around 20, 12, and 2.6 Ma. The dust source system was also rather unstable at 25-20, 12-7 and 1.2-0 Ma, while three stable stages occurred at 20-12, 7-2.6, and 2.6-1.2 Ma. The correlation between the provenance changes and paleoclimatic and tectonic evidence suggests that both tectonic and climatic factors were important in driving the observed stepwise provenance changes. However, the changes were mainly constrained by Tibetan Plateau uplift prior to the Quaternary, and by global climate change thereafter. |
| 刊物名称: |
GEOCHIMICA ET COSMOCHIMICA ACTA |
| 英文刊物名称: |
GEOCHIMICA ET COSMOCHIMICA ACTA |
| 论文全文: |
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| 英文论文全文: |
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| 全文链接: |
http://www.sciencedirect.com/science/article/pii/S0016703716307062 |
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