| 芒崖凹陷干旱气候背景下网状河流沉积体系及演化 |
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| 关键词:anastomosed fluvial Sedimentary characteristics Arid climate Pliocene Series Mangya Depression |
| 基金项目:教育部重点科学技术项目资助 |
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| 摘要: |
| Anastomosed Fluvial Depositional System Formed in Arid Climate Background and Its Evolution, Mangya Depression |
| The sediments of Pliocene Series at Mangya Depression of Qinghai Province were deposited by fluvial sedimentation according to the outcrop data and Markov Chain analysis of lithofacies transitions of drilled well cores. According to the analysis of lithofacies and achitectural-element of this Pliocene Series, anastomosed depositional system exists in the lower-middle Pliocene Series and braided depositional system exists in upper Pliocene Series. The sporomorphs, deep desiccation crack and calcareous concretion all indicate that the anastomosing fluvial system formed and developed in warmer arid climate which suitable for plants to grow exuberantly. The evolution from anastomosing to braided fluvial systems was influenced mainly by the subsidence rate of Basin basement, colder arid climate and distinct decrease of vegetation. |
| WANG Sui-ji,REN Ming-da.2000.Anastomosed Fluvial Depositional System Formed in Arid Climate Background and Its Evolution, Mangya Depression[J].Acta Geoscientica Sinica,21(1):92-97. |
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