辫状河—曲流河转换模式探讨——以准噶尔盆地南缘头屯河组露头为例
- 收稿日期:
2013-07-02
- 修回日期:
2013-08-05
- 刊出日期:
2014-06-10
摘要: 为探讨辫状河向曲流河转换的模式，以准噶尔盆地南缘头屯河剖面中侏罗统头屯河组为例，在层序地层学与沉积学的理论指导下，在层序划分与河流成因岩相类型确定的基础上，通过野外露头实测、剖面精细解剖及沉积观察描述，对头屯河组辫状河—曲流河（辫—曲）转换进行成因分析与特征总结，明确了辫—曲转换的控制因素，再现了辫—曲转换的沉积背景。研究表明：基准面旋回、物源供给、地形坡度及古气候4个方面控制着头屯河组辫—曲转换的过程。随着基准面的逐渐升高，物源供给的减弱，地形坡度的减缓，古气候环境炎热干旱，头屯河组逐渐由辫状河向曲流河转换。最终由头屯河组野外露头垂向序列，建立了辫—曲转换的局部沉积构型模式和区域沉积演化模式。
Discussion on the Model of Braided River Transform to Meandering River: As an example of Toutunhe Formation in Southern Junggar Basin
- Received Date:
2013-07-02
- Rev Recd Date:
2013-08-05
- Publish Date:
2014-06-10
Abstract: Under the guidance of sequence stratigraphy and sedimentology theory, detailed research on Toutunhe Formation in the Toutunhe outcrop, southern margin of Junggar Basin was carried out to discuss the model of braided river transform to meandering river. On the basis of the division of sequences and the determination of river-genesis lithofacies, by the field measuring, fine dissecting and sedimentation description and observation, braided river transform to meandering river (braided to meandering river) in Toutunhe Formation was analyzed and characteristics summarized, and the control factors and depositional setting of braided to meandering river were cleared. In this study, the process of braided to meandering river was controlled by base-level cycle, sedimentary source recharge, gradient and paleoclimate. As the base level rising, sedimentary source recharge decreasing, gradient slowing down and paleoclimate changing to hot-arid gradually, the river type change from braided river to meandering river. Eventually, by the vertical sequence of Toutunhe Formation, the local and regional depositional evolution models are built up.
辫状河—曲流河转换模式探讨——以准噶尔盆地南缘头屯河组露头为例[J]. 沉积学报, 2014, 32(3): 450-458.
| 引用本文: |
辫状河—曲流河转换模式探讨——以准噶尔盆地南缘头屯河组露头为例[J]. 沉积学报, 2014, 32(3): 450-458.
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Discussion on the Model of Braided River Transform to Meandering River: As an example of Toutunhe Formation in Southern Junggar Basin[J]. Acta Sedimentologica Sinica, 2014, 32(3): 450-458.
| Citation: |
Discussion on the Model of Braided River Transform to Meandering River: As an example of Toutunhe Formation in Southern Junggar Basin[J]. Acta Sedimentologica Sinica, 2014, 32(3): 450-458.
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