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[第7篇SCI]滹沱河上游忻定古湖的决口及构造对横向冲沟形成的意义

已有 5017 次阅读 2013-10-27 07:30 |个人分类:研究论文|系统分类:论文交流| 河流阶地, 滹沱河, 忻定盆地, 古湖, 横向冲沟

Tectonic controls for transverse drainage and timing of the Xin-Ding paleolake breach in the upper reach of the Hutuo River, north China

Junjie Rena, b,  Shimin Zhanga, Andrew J. Meigsb,Robert S. Yeatsb,Rui Dinga,Xiaoming Shena

aKey Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China

bCollege of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA


Highlights

•We reconstruct fluvial terrace sequence and long-term drainage evolution in the upper reach of the Hutuo river system.

•The creation of the transverse drainage and breach of the Xin-Ding paleolake occurred between ~ 600 and ~ 130 ka.

•The mechanism for the creation of transverse drainage is river capture because of localized differential tectonic uplift and associated tilting.

 

Abstract

The upper reach of the Hutuo River flows along the Xin-Ding basin and cuts a transverse drainage through the Xizhou Mountain and the Taihang Range into the North China Plain. Previous studies showed that the Xin-Ding basin was occupied by a lake during the early-middle Pleistocene. However, the timing of the paleolake breach and the mechanism for the creation of the transverse drainage are unknown. We constructed the fluvial terrace sequence in the upper reach of the Hutuo drainage combined with thermoluminescence (TL) and optically stimulated luminescence (OSL) dating, as well as the timescale of the overlying loess–paleosol sequence. Our results reveal that (1) five terraces (T5-T1) developed along the upper reach of the Hutuo River, amongst which terraces T4-T1 were formed synchronously at ~ 600, ~ 120-130, ~ 20-26 and ~ 6-7 ka, respectively; (2) the creation of the transverse drainage and breach of the Xin-Ding paleolake occurred between ~ 600 and ~ 130 ka; and (3) the mechanism for the creation of the transverse drainage is via river piracy of paleostreams on both sides of the drainage divide. Localized differential uplift and associated tilting of the Xizhou Mountain block during the middle Pleistocene result in the formation of the transverse drainage and breach of the Xin-Ding paleolake.

 

Geomorphology   Volume 206, 1 February 2014, Pages 452–467


http://www.sciencedirect.com/science/article/pii/S0169555X13005321



Junjie Ren_Geomorphology2014.pdf


 





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