The aggradation process of transversal dunes since late-Pleistocene in Badain Jaran Desert, northwest China revealed by OSL dating

2021 ◽  
Author(s):  
Qinjing Shen ◽  
Zhongping Lai
Keyword(s):  
Northwest China ◽  
Alluvial Fan ◽  
Osl Dating ◽  
Western China ◽  
Deposition Condition ◽  
Average Height ◽  
Badain Jaran Desert ◽  
Aeolian Sand ◽  
Two Phases ◽  
Turn Over

<p>Transversal dunes are widespread in many deserts, but the application of these un-stabilized dunes in the palaeoclimate region is limited. Because transversal dunes normally migrate too fast, which means this kind of dune has a low possibility to record long period paleoclimate information. Nevertheless, both model simulations and field observation demonstrate that larger (higher) dunes containing a greater mass of sand have longer turn-over times. If so, there may be particular giant transversal dunes, in which long periods of climate changes are actually preserved and could be used as geoproxy to reconstruct paleoenvironment changes.</p><p>The Badain Jaran desert, situated in north-western China, features the tallest dunes (about 480 m) on the earth. More than 50% of the sand sea is covered by transversal dunes with an average height of 200 to 300 m. Here, we investigated two representative mega-dunes in the center of the desert and took 22 OSL samples systematically to try to reconstruct the deposition history of these two mega-dunes. Our result demonstrates that one of the dunes is formed since ~62 ka, with two phases of superposed dunes dated to 26~32 ka and modern time. Another mage-dune started to deposited from 29 ka and climbed by early to middle Holocene superposed-dunes and modern ones. Furthermore, while other active sand seas preserve scarcely aeolian sand deposited during the LGM period (Last Glacial Maximum: 26.5-19.0 ka BP), 11 of our 22 OSL dating results fall into the LGM period, which indicates that mega-dunes in the Badain Jaran desert continue aggradation during LGM. In that case，we speculate there are at least three factors facilitating the mega-dunes in Badain Jaran desert different from other transversal dunes that can preserve LGM sediments. (1) Badain Jaran desert, situated in a relatively subsiding basin, has a favor deposition condition; (2) The desert is close to the aeolian sand provenance area, an alluvial fan stored abundant silt-sand material derived from the southeast Tibet; (3) the shallow buried wet sand in Badain Jaran desert may promote the formation of the mega-dunes and reduce their migration speed, so that extend the turn-over times of the mega-dunes.</p>

scholarly journals Application of Multiple Approaches to Investigate the Hydrochemistry Evolution of Groundwater in an Arid Region: Nomhon, Northwestern China

Water ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1667 ◽  
Author(s):  
Nuan Yang ◽  
Guangcai Wang ◽  
Zheming Shi ◽  
Dan Zhao ◽  
Wanjun Jiang ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Qaidam Basin ◽  
Groundwater Resources ◽  
Atmospheric Precipitation ◽  
Northwest China ◽  
Major And Trace Elements ◽  
Alluvial Fan ◽  
Hydrogeochemical Processes ◽  
Recharge Sources ◽  
Gypsum Precipitation

Groundwater is a critical water resource for human survival and economic development in arid and semi-arid areas. It is crucial to understand the groundwater circulation and hydrochemical evolution for sustainable management and utilization of groundwater resources in those areas. To this end, an investigation of the hydrochemical characteristics of surface water and groundwater was conducted in Nomhon, an arid area located in the Qaidam Basin, northwest China, by using hydrochemical (major and trace elements) and stable isotopes (δD and δ18O) approaches. Stable isotopes and ion ratios were analyzed to determine the recharge sources, hydrochemistry characteristics, and major hydrogeochemical processes. Meanwhile, inverse geochemistry modeling was applied to quantitatively determine the mass transfer of hydrogeochemical processes. The results showed that groundwater in the study area is mainly recharged by atmospheric precipitation in mountainous areas, and the groundwater in the center of basin might originate from ancient water in cold and humid environments. Along the groundwater flow path, the TDS of groundwater increased gradually from fresh to salty (ranging from 462.50 to 19,604.40 mg/L), and the hydrochemical type changed from Cl·HCO3–Na·Mg·Ca to Cl–Na. Groundwater chemical composition and mass balance modeling results indicated that from alluvial fan to lacustrine plain, the main hydrogeochemical processes changed from the dissolution of halite and albite and the precipitation of dolomite and kaolinite to the dissolution of halite and gypsum, precipitation of calcite, redox (SO42− reduction), and cation exchange. This study would be helpful for water resources management in this area and other similar areas.

Facies and depositional model of alluvial fan dominated by episodic flood events in arid conditions: An example from the Quaternary Poplar Fan, north‐western China

Sedimentology ◽  
2019 ◽  
Vol 67 (4) ◽  
pp. 1750-1796
Author(s):  
Chonglong Gao ◽  
Youliang Ji ◽  
Chenliang Wu ◽  
Jun Jin ◽  
Ying Ren ◽  
...  
Keyword(s):  
Alluvial Fan ◽  
Western China ◽  
Depositional Model ◽  
Flood Events ◽  
Arid Conditions ◽  
North Western

Holocene aeolian sand mobilization, vegetation history and human impact on the stabilized sand dune area of the southern Nyírség, Hungary

2012 ◽  
Vol 78 (3) ◽  
pp. 492-501 ◽  
Author(s):  
Tímea Kiss ◽  
György Sipos ◽  
Barbara Mauz ◽  
Gábor Mezősi
Keyword(s):  
Sand Dune ◽  
Vegetation History ◽  
Agricultural Practices ◽  
Alluvial Fan ◽  
Optically Stimulated Luminescence ◽  
Anthropogenic Factors ◽  
Aeolian Sand ◽  
Humid Climate ◽  
Aeolian Activity ◽  
First Time

AbstractAlmost 20% of the territory of Hungary is covered by stabilized dunes formed during the Pleistocene. With the climate amelioration during the early Holocene the aeolian activity ceased. However, various environmental and anthropogenic factors could have reactivated the aeolian processes. Today, there is an increasing climatic stress on the dune fields of the Carpathian Basin, which is coupled with inadequate land use. It is therefore necessary to determine the timing and circumstances of sand mobilization during the Holocene. The site of the present study is located in a dune–interdune system on the southern part of the Nyírség alluvial fan, where periods of Holocene aeolian activity and environmental change were investigated using palynological and sedimentological methods, optically stimulated luminescence and radiocarbon dating. The data achieved show climate-driven Boreal aeolian activity at approximately 8.2 ka, and also demonstrate for the first time that during the Atlantic Phase (6.4 and 5.3 ka), in spite of the relatively humid climate and dense vegetation, aeolian activity has taken place, induced probably by agricultural practices. Following Subboreal morphological stability, aeolian activity occurred several times in the Subatlantic Phase (2.4–2.2, 1.2–0.8 and 0.4–0.1 ka) as a result of vegetation changes and human activity.

scholarly journals National and cultural activities of the Tatar diaspora in the North Western China in the first half of the XX century: theater and string orchestra

2020 ◽  
pp. 60-64
Author(s):  
G.N. Khisamieva
Keyword(s):  
Local Population ◽  
Northwest China ◽  
Western China ◽  
String Orchestra ◽  
The North ◽  
Cultural Life ◽  
The People ◽  
History Of ◽  
First Time

The relevance of the study lies in the fact that the national and cultural life of the Tatar diaspora in the Northwest China has not been the subject of the research. The research interest is also caused by the fact that the history of the formation and development of the Tatar diaspora, every day, spiritual, educational and cultural life has not been studied at all and is of particular interest to researchers. The scientific novelty of the work lies in the fact that the article examines the process of formation of Tatar theaters and string orchestras in the cities of Kuldzha and Chuguchak for the first time, where the bulk of Tatar emigrants lived. Particular attention was paid to the role of Tatar theaters in the life of indigenous and visiting peoples of the XUAR of the PRC. The purpose of the work is to study and systematize the national and cultural life of the Tatars of Xinjiang. As a result of the study, it can be concluded that the creation of theaters and string orchestras has contributed to the rallying of the Tatars, as well as the preservation of the native language, literature, traditions, culture and identity of the people, which is also a very important factor in preserving identity among the local population of Xinjiang.

scholarly journals Stable Isotope Composition in Surface Water in the Upper Yellow River in Northwest China

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 967 ◽  
Author(s):  
Mengyu Shi ◽  
Shengjie Wang ◽  
Athanassios A. Argiriou ◽  
Mingjun Zhang ◽  
Rong Guo ◽  
...  
Keyword(s):  
Surface Water ◽  
River Water ◽  
Yellow River ◽  
Isotope Composition ◽  
Relevant Information ◽  
Northwest China ◽  
Western China ◽  
River Waters ◽  
Upper Yellow River ◽  
D Values

Although stable isotopes of hydrogen and oxygen in surface waters (especially in river waters) are useful tools to understand regional hydrological processes, relevant information at some upper reaches of large rivers in western China is still limited. During 2016–2017, we focused on the Liujiaxia Reservoir along the upper Yellow River, where we collected surface water samples at two locations, above and below the dam (identified as “lake water” and “river water”). The results show that the heavy isotopes in lake and river waters are enriched during the warm months, when the river discharge is large, and depleted during the cold months. The slopes of the water line (δ2H versus δ18O) for both the lake and river waters were lower than that of the global mean, due to evaporation. The different d values of the lake and river water reflect the regional evaporation and water sources.

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