Drainage reorganization and divide migration driven by basin subsidence: An example from the Micang Shan, outskirts of eastern Tibet and its implications for Cenozoic evolution of the Yangtze River

IF 2.8 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Basin Research Pub Date : 2024-05-28 DOI:10.1111/bre.12875
Yijia Ye, Xibin Tan, Yiduo Liu, Shuang Bian, Chao Zhou, Xun Zeng, Feng Shi, Mingxing Gao
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引用次数: 0

Abstract

The Cenozoic India-Asia collision has elevated the Tibetan Plateau and produced large strike-slip faults in the interior and margins of the plateau, which profoundly influenced drainage reorganization and divide migration in Asia. Recent studies have revealed that the drainage divides between the major rivers in and around the Tibetan Plateau have been migrating for tens of millions of years, due to tectonic and/or climatic disturbance or river capture events. Drainage-divide stability analysis can provide new, independent insights into the Cenozoic evolution of the river systems. In this study, we focus on the Hanzhong Basin and the adjacent Micang Shan (Shan means Mountain(s)) at the tail of the Qingchuan strike-slip fault in the outskirts of eastern Tibet. We investigated the stability of the Micang Shan drainage divide, which separates the Han and Jialing rivers (two major tributaries of the Yangtze River), using two methods—χ-plot and Gilbert metrics. The results show that most segments of the Micang Shan drainage divide are either moving south or stable. We further calculated the predicted stable divide location and identified the abandoned river channels and residual planation surfaces. Based on these analyses, we suggest that (1) the migration of the Micang Shan drainage divide is driven by the tectonic subsidence of the Hanzhong Basin; and (2) the upper reaches of the Han River flowed southward to the Sichuan Basin before basin subsidence. This study supports the hypothesis that the Palaeo-Middle Yangtze River and its tributaries primarily flowed southward. Moreover, the flow direction of the Middle Yangtze River has been, and still is, transitioning from southward to eastward. The change in river network flow direction is driven by regional block tilting towards the east, surface deformation from strike-slip faulting, regional extension east of the Tibetan Plateau and/or increased influence from the summer monsoon.

Abstract Image

Abstract Image

流域下沉驱动的排水重组和分水岭迁移:以西藏东部米仓山为例及其对长江新生代演化的影响
新生代印度-亚洲碰撞抬升了青藏高原,并在高原内部和边缘产生了大型走向滑动断层,对亚洲的排水重组和分水岭迁移产生了深远影响。最近的研究表明,由于构造和/或气候扰动或河流俘获事件,青藏高原及其周围主要河流之间的排水分界线已经迁移了数千万年。流域分水岭稳定性分析可为了解新生代河流系统演变提供新的独立见解。在本研究中,我们重点研究了汉中盆地和毗邻的米仓山(山的意思),它们位于西藏东部郊区青川走向滑动断层的尾部。我们采用χ-plot 和 Gilbert 指标两种方法研究了米仓山分水岭的稳定性,该分水岭将汉江和嘉陵江(长江的两条主要支流)分隔开来。结果表明,米仓山分水岭的大部分地段都在向南移动或趋于稳定。我们进一步计算了预测的稳定分水岭位置,并确定了废弃河道和残留刨面。根据这些分析,我们认为:(1)米仓山流域分水岭的迁移是由汉中盆地的构造沉降所驱动的;(2)汉江上游在盆地沉降之前就已南流至四川盆地。这项研究支持了古中游长江及其支流主要向南流动的假说。此外,长江中游的流向一直并仍在由南向东过渡。河网流向的变化是由区域块体向东倾斜、走向滑动断层引起的地表变形、青藏高原向东的区域延伸和/或夏季季风影响的增加所驱动的。
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来源期刊
Basin Research
Basin Research 地学-地球科学综合
CiteScore
7.00
自引率
9.40%
发文量
88
审稿时长
>12 weeks
期刊介绍: Basin Research is an international journal which aims to publish original, high impact research papers on sedimentary basin systems. We view integrated, interdisciplinary research as being essential for the advancement of the subject area; therefore, we do not seek manuscripts focused purely on sedimentology, structural geology, or geophysics that have a natural home in specialist journals. Rather, we seek manuscripts that treat sedimentary basins as multi-component systems that require a multi-faceted approach to advance our understanding of their development. During deposition and subsidence we are concerned with large-scale geodynamic processes, heat flow, fluid flow, strain distribution, seismic and sequence stratigraphy, modelling, burial and inversion histories. In addition, we view the development of the source area, in terms of drainage networks, climate, erosion, denudation and sediment routing systems as vital to sedimentary basin systems. The underpinning requirement is that a contribution should be of interest to earth scientists of more than one discipline.
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