scholarly journals ESR dose response of Al center measured in quartz samples from the Yellow River (China): Implications for the dating of Upper Pleistocene sediment

2013 ◽  
Vol 40 (4) ◽  
pp. 341-347 ◽  
Author(s):  
Pierre Voinchet ◽  
Gongming Yin ◽  
Christophe Falguères ◽  
Chunru Liu ◽  
Fei Han ◽  
...  
Keyword(s):  
Yellow River ◽  
Growth Curves ◽  
River System ◽  
The Yellow River ◽  
Esr Dating ◽  
Upper Pleistocene ◽  
Fluvial Terraces ◽  
Lower Pleistocene ◽  
Dating Method ◽  
Pleistocene Sediment

Abstract The ESR dating method requires to describe the evolution of the ESR signal intensities vs. increasing gamma doses, then to extrapolate the equivalent dose of radiation received by the sample since its deposition using mathematical fitting. The function classically used to describe the growth curves of ESR aluminium signal in quartz was recently discussed and challenged for Lower Pleistocene sediments. In the present work, some alluvial sediments sampled in Upper Pleistocene fluvial terraces of the Yellow River system (China) permit us to test the application of another extrapolation function (linear + exponential) recently proposed for Lower Pleistocene sediments. The equivalent doses obtained here for the recent deposits of the Yellow River system and the corresponding ages are promising and indicate the potential of ESR to date quartz deposits from Upper Pleistocene times.

scholarly journals Erosion-induced massive organic carbon burial and carbon emission in the Yellow River basin, China

2014 ◽  
Vol 11 (4) ◽  
pp. 945-959 ◽  
Author(s):  
L. Ran ◽  
X. X. Lu ◽  
Z. Xin
Keyword(s):  
Soil Erosion ◽  
Organic Carbon ◽  
River Basin ◽  
Yellow River ◽  
River System ◽  
Yellow River Basin ◽  
Transport Processes ◽  
The Yellow River ◽  
Organic Carbon Burial ◽  
The Yellow River Basin

Abstract. Soil erosion and terrestrial deposition of soil organic carbon (SOC) can potentially play a significant role in global carbon cycling. Assessing the redistribution of SOC during erosion and subsequent transport and burial is of critical importance. Using hydrological records of soil erosion and sediment load, and compiled organic carbon (OC) data, estimates of the eroded soils and OC induced by water in the Yellow River basin during the period 1950–2010 were assembled. The Yellow River basin has experienced intense soil erosion due to combined impact of natural process and human activity. Over the period, 134.2 ± 24.7 Gt of soils and 1.07 ± 0.15 Gt of OC have been eroded from hillslopes based on a soil erosion rate of 1.7–2.5 Gt yr−1. Approximately 63% of the eroded soils were deposited in the river system, while only 37% were discharged into the ocean. For the OC budget, approximately 0.53 ± 0.21 Gt (49.5%) was buried in the river system, 0.25 ± 0.14 Gt (23.5%) was delivered into the ocean, and the remaining 0.289 ± 0.294 Gt (27%) was decomposed during the erosion and transport processes. This validates the commonly held assumption that 20–40% of the eroded OC would be oxidized after erosion. Erosion-induced OC redistribution on the landscape likely represented a carbon source, although a large proportion of OC was buried. In addition, about half of the terrestrially redeposited OC (49.4%) was buried behind dams, revealing the importance of dam trapping in sequestering the eroded OC. Although several uncertainties need to be better constrained, the obtained budgetary results provide a means of assessing the redistribution of the eroded OC within the Yellow River basin. Human activities have significantly altered its redistribution pattern over the past decades.

scholarly journals Luminescence chronology of the Yellow River terraces in the Heiyukou area, China, and its implication for the uplift rate of the Ordos Plateau

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Yan-Yan Yan ◽  
Jia-Fu Zhang ◽  
Gang Hu ◽  
Li-Ping Zhou
Keyword(s):  
Yellow River ◽  
Age Distribution ◽  
The Yellow River ◽  
Red Clay ◽  
Fluvial Terraces ◽  
Ordos Plateau ◽  
River Terraces ◽  
Relative Chronology ◽  
Uplift Rates ◽  
Geomorphological Evolution

AbstractThe precise chronology of the fluvial terraces of the Yellow River in China is essential to understand its geomorphological evolution history. More terrace ages are needed for the correlation of the terraces along the river and the construction of the longitudinal profile. In this study, seven terraces (T1–T7) in the Heiyukou area of the Jinshaan Canyon of the river were identified and were sampled for optical dating. The reliability of the ages was evaluated on the bases of bleachability, comparison of optical ages on fine and coarse grains, stratigraphic consistency of OSL ages, age distribution and geomorphological setting. The results show that the paired T2 terrace was formed at 72 ± 3 ka, and the T4, T5 strath terraces were dated to 108 ± 4 and >141 ± 4 ka, respectively. The ages for the samples from T6 and T7 were significantly underestimated, and the ‘infinitely old’ pre-Quaternary Red-Clay sample on the T7 terrace was dated to 134 ± 6 ka. The long-term river incision rates were calculated to be <0.36, 0.34 and 0.18 mm/a for at least the past 141, 108 and 72 ka, respectively, which also reflect the uplift rates of the Ordos plateau. The implication for dating terrace deposits is that terraces should be systemically sampled and dated using both fine and coarse grain fractions. The reliability of the ages obtained for high terraces should be evaluated using a relative chronology of dated samples on a case-by-case basis, if no independent numerical age controls are available.

scholarly journals Evolution of the Upper Yellow River as Revealed by Changes in Heavy-Mineral and Geochemical (REE) Signatures of Fluvial Terraces (Lanzhou, China)

Minerals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 603 ◽  
Author(s):  
Wang ◽  
Zhang ◽  
Garzanti ◽  
Nie ◽  
Peng ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Yellow River ◽  
Heavy Mineral ◽  
The Yellow River ◽  
Sediment Fluxes ◽  
Fluvial Terraces ◽  
Northeastern Tibetan Plateau ◽  
Pleistocene Climate ◽  
Pleistocene Climate Change ◽  
Upper Yellow River

Despite decades of study, the factors that controlled the formation and evolution of theupper reaches of the Yellow River, including uplift of the northeastern Tibetan Plateau, Pliocene-Pleistocene climate change, and autogenetic processes are still poorly constrained. The stratigraphicrecord of such paleogeographic evolution is recorded in the sequence of nine terraces formed duringprogressive incision of the Yellow River in the last 1.7 Ma. This article investigates in detail forsediment provenance in terraces of the Lanzhou area, based on heavy-mineral and geochemical(REE) signatures. Two main provenance changes are identified, pointing each to a majorpaleogeographic reorganization coupled with expansion of the upper Yellow River catchment andenhanced sediment fluxes. The first change took place between the deposition of terrace T9 (formedaround 1.7 Ma) and terrace T8 (formed around 1.5 Ma), when rapid fluvial incision point to tectoniccontrol and active uplift of northeastern Tibetan Plateau. The second change took place betweendeposition of terrace T4 (formed around 0.86 Ma) and terrace T3 (formed around 0.14 Ma), duringa period of low incision rates and notably enhanced sediment fluxes as a response to enhanced EastAsian Summer Monsoon and consequently increased precipitations, pointing instead chiefly toclimatic control.

scholarly journals Determining the Age of Terrace Formation Using Luminescence Dating—A Case of the Yellow River Terraces in the Baode Area, China

2020 ◽  
Vol 3 (1) ◽  
pp. 17 ◽  
Author(s):  
Jia-Fu Zhang ◽  
Wei-Li Qiu ◽  
Gang Hu ◽  
Li-Ping Zhou
Keyword(s):  
Yellow River ◽  
Luminescence Dating ◽  
The Yellow River ◽  
Deposition Rates ◽  
Fluvial Terrace ◽  
Fluvial Terraces ◽  
Ordos Plateau ◽  
River Terraces ◽  
Lower Terrace ◽  
Block Based

Dating fluvial terraces has long been a challenge for geologists and geomorphologists, because terrace straths and treads are not usually directly dated. In this study, the formation ages of the Yellow River terraces in the Baode area in China were determined by dating fluvial deposits overlying bedrock straths using optically stimulated luminescence (OSL) dating techniques. Seven terraces (from the lowest terrace T1 to the highest terrace T7) in the study area were recognized, and they are characterized by thick fluvial terrace deposits overlaid by loess sediments. Twenty-five samples from nine terrace sections were dated to about 2–200 ka. The OSL ages (120–190 ka) of the fluvial samples from higher terraces (T3–T6) seem to be reliable based on their luminescence properties and stratigraphic consistency, but the geomorphologic and stratigraphic evidence show that these ages should be underestimated, because they are generally similar to those of the samples from the lower terrace (T2). The formation ages of the terrace straths and treads for the T1 terrace were deduced to be about 44 ka and 36 ka, respectively, based on the deposition rates of the fluvial terrace deposits, and the T2 terrace has the same strath and tread formation age of about 135 ka. The incision rate was calculated to be about 0.35 mm/ka for the past 135 ka, and the uplift rate pattern suggests that the Ordos Plateau behaves as a rigid block. Based on our previous investigations on the Yellow River terraces and the results in this study, we consider that the formation ages of terrace straths and treads calculated using deposition rates of terrace fluvial sediments can overcome problems associated with age underestimation or overestimation of strath or fill terraces based on the single age of one fluvial terrace sample. The implication is that, for accurate dating of terrace formation, terrace sections should be systematically sampled and dated.

GEOMORPHOLOGICAL CHARACTERISTICS OF A TRANSECT FROM THE YELLOW RIVER TO THE IRON PAGODA IN KAIFENG CITY, CHINA

2018 ◽  
Vol 14 (1) ◽  
pp. 245-254 ◽  
Author(s):  
Yang LI ◽  
◽  
Zhixiang XIE ◽  
Fen QIN ◽  
Yaochen QIN ◽  
...  
Keyword(s):  
Yellow River ◽  
The Yellow River ◽  
Kaifeng City
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