Paleogene-Neogene deposits in the Tongtian River Basin, Qinghai and their geological implications
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摘要: 通过对青海通天河盆地古、新近纪地层层序、沉积特征、物源区及沉积环境分析,建立其垂向相序,总结出该区具冲积扇相、三角洲相、湖泊相的特点,并得出通天河盆地古、新近纪物源区主要为北部开心岭隆起区的结论。根据石膏、灰岩夹层及粒度特征等环境标志推测:中始新世气候炎热湿润,晚始新世气候炎热干燥,渐新世气候炎热湿润,中中新世气候温暖潮湿;青藏高原的隆升具有阶段性。Abstract: The integrated examination of stratigraphic sequences, depositional characteristics, provenances and sedimentary environments of the Paleogene-Neogene deposits in the Tongtian River Basin, Qinghai results in the construction of a vertical facies sequence, including the alluvial fan facies, delta facies and lake facies. During the Paleogene-Neogene, the provenance of the Tongtian River Basin was derived from the Kaixinling uplift in the north. According to the gypsum and limestone intercalations and grain sizes, the authors contend that the (climates) were hot and moist in the basin during the middle Eocene, hot and dry during the late Eocene, hot and humid during the Oligocene, and warm and wet during the middle Miocene. The uplifting of the (Qinghai-Xizang) Plateau is interpreted to be episodic.
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Keywords:
- Tongtian River Basin /
- Paleogene /
- Neogene /
- depositional characteristics /
- Qinghai
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