globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.01.013
Scopus记录号: 2-s2.0-85010953738
论文题名:
Evolution of the alluvial fans of the Luo River in the Weihe Basin, central China, controlled by faulting and climate change - A reevaluation of the paleogeographical setting of Dali Man site
作者: Rits D.S.; van Balen R.T.; Prins M.A.; Zheng H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 166
起始页码: 339
结束页码: 351
语种: 英语
英文关键词: Alluvial fan ; Dali man ; Fluvial incision ; Luo river ; Neotectonics ; Weihe basin
Scopus关键词: Faulting ; Glacial geology ; Landforms ; Magnetic susceptibility ; Rivers ; Sedimentology ; Sediments ; Wetlands ; Alluvial fans ; Dali man ; Fluvial incision ; Neotectonics ; Weihe basin ; Climate change
英文摘要: The Luo River is located in the southern part of the Chinese Loess Plateau and the northern part of the Weihe Basin, in Central China. In the basin it flows proximal to the site of the Luyang Wetland core, which is an important archive of climate change over the past 1 Myr in this region. In this paper, the contribution of the Luo River to the sedimentary record is analyzed by reconstructing the evolution of this river during the Middle to Late Pleistocene. It is argued that an alluvial fan of the Luo River has contributed to the sedimentary archive until approximately 200–240 ka. From this moment onwards, the fan became incised and terraces began to form. The formation of a new alluvial fan further downstream led to the disconnection of the Luo River from the Luyang Wetland core site. We propose that this series of events was caused by the displacement of an intra-basinal fault and the resultant faulting-forced folding, which caused increased relative subsidence, and thus increased sedimentation rates at the core site. Therefore, a complete sediment record in the ‘Luyang Wetland’ was preserved, despite the disconnection from the Luo River. The chronology of the fans and terraces was established using existing age control (U-series, ESR, OSL, pIRIR290 and magnetic susceptibility correlation), and through correlation of the loess-paleosol cover to marine isotope stages. Based on sedimentological characteristics of the fluvial sequence, we suggest that incision of the Luo River occurred in two steps. Small incisions took place at transitions to interglacials and the main incision phases occur at the transition from an interglacial to glacial climate. Due to the incision, basal parts of the oldest Luo River alluvial fan are exposed, and it is in one of these exposures that the famous Dali Man skull was retrieved. This study shows that the Dali Man did not live on a river terrace as previously thought, but on an aggrading alluvial fan, during wet, glacial conditions. © 2017 Elsevier Ltd
资助项目: The authors want to express gratitude to guest editor dr. S. Cordier and two anonymous reviewers for their suggestions. The authors are also grateful to dr. B. Metcalfe for his textual improvements and to dr. Q. Shao from the School of Geography Science, Nanjing Normal University, for running the U-Th isotope analysis. We also want to thank dr. S.R. Troelstra, dr. F. Wesselingh, dr. K. Cummings and dr. D.L. Graf for their help in determining the type of shell species. This work is financially supported by the National Basic Research Program of China (Grant No.2015CB953804), the “Strategic Priority Research Program” of the Chinese Academy of Sciences (Grant No. XDB03020300), the China Geological Survey: Continental Shelf Drilling Program (project No. GZH201100202), Natural Science Foundation of Jiangsu Province (Grant No. BK20150065) and the Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) “Natural environmental conditions for Paleolithic hominids in central China” (Grant No. 530-5CDP07).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59209
Appears in Collections:过去全球变化的重建

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作者单位: School of Geography Science, Nanjing Normal University, Nanjing, China; Department of Earth Sciences, VU University Amsterdam, Amsterdam, Netherlands; TNO, Geological Survey of the Netherlands, Utrecht, Netherlands; School of Resource, Environment and Earth Science, Yunnan University, Chenggong District, Kunming, China

Recommended Citation:
Rits D.S.,van Balen R.T.,Prins M.A.,et al. Evolution of the alluvial fans of the Luo River in the Weihe Basin, central China, controlled by faulting and climate change - A reevaluation of the paleogeographical setting of Dali Man site[J]. Quaternary Science Reviews,2017-01-01,166
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