Adelsberger and J. Geomorphology , vol. Halik, B. Cyffka, M. Kuba, A. Abliz et al. Int , vol. Al-dousari, M. Al-elaj, E. Al-enezi, and A.
OSL dating of sediments from deserts in northern China
Exploration of the development of these sand dunes will be helpful for identifying the forces underlying the desert landscape and for identifying a solution to protect the salt resources. Through field investigation, we found sand dunes overlying either lacustrine and bog deposits on the lake bed at a lower altitude or littoral sediments on the higher lakeshores. Optically Stimulated Luminescence OSL dating results indicate that sands started to accumulate around the JSL as early as the early Holocene around 11 ka , while the rapid development of sand dunes occurred within the latest 0.
By comparison with climatic documents and human activities in adjacent regions, the initiation of sand accumulation around the JSL as early as the early Holocene is considered to be the result of low effective moisture in the Jilantai area. However, the rapid development of the sand dunes in the vast area surrounding the JSL was likely initiated by the intensified human activities which occurred within the latest 0.
Dans les déserts du nord-ouest de la Chine, des sédiments lacustres et deserts and sandy lands located in northern China at elevations up to m asl., the optically stimulated luminescence (OSL) dating methods (Yang et al., a).
Optically stimulated luminescence dating of sandy deposits from Gulang county at the southern margin of the Tengger Desert, China. Journal of Arid Land , , 8 1 : Please wait a minute The Tengger Desert in China is sensitive to the waxing and waning of the monsoonal system. In response to past climate change, the southern margin of the Tengger Desert has evolved significantly since the last glacial period. However, previous attempts to date aeolian deposits in this region were mainly based on radiocarbon dating, which has problems when applied to aeolian deposits.
Moreover, sedimentary records are limited. Accordingly, past aeolian activity in this desert remains poorly understood. In the present study, we dated sand samples from Gulang county at the southern margin of the Tengger Desert using optically stimulated luminescence OSL to understand the history of aeolian activity in this region. Our samples represented well-sorted aeolian sands and sandy loess. Aeolian sands are evidence of dune field buildup and sparse vegetation cover whereas sandy loess is evidence of improved stabilization of sand dunes resulting from ameliorated vegetation cover.
Hobq desert is one of the important deserts in the central China. Researches of formation and evolvement of such a desert will be helpful to understanding paleoenvironmental and paleoclimatic changes in this region. In this paper, stratigraphic sequence of the Hobq Desert was observed through thirteen profiles and pits along five sections south-north extended through the entire desert.
3 Institute of Crustal Dynamics, Chinese Earthquake Administration, Beijing , Keywords: Selin Co, beach ridges, Tibetan Plateau, OSL dating, MIS Although the dating of covered top aeolian sediments would not provide a direct over qinghai-xizang plateau and sub-regions in recent 34 Years J. Desert Res.
Deze blog is opgedragen aan mijn overleden echtgenote Lucienne. In verloor ze haar moedige strijd tegen kanker! In startte ik deze blog, omdat ik niet moc ht stoppen met mijn UFO-onderzoek. A new study from The University of Texas at Austin is helping scientists piece together the ancient climate of Mars by revealing how much rainfall and snowmelt filled its lake beds and river valleys 3. New research from The University of Texas at Austin has used dry Martian lake beds to determine how much precipitation was present on the ancient planet.
Credit: Gaia Stucky de Quay. The ancient climate of Mars is something of an enigma to scientists. To geologists, the existence of riverbeds and paleolakes — eons-old lake basins — paints a picture of a planet with significant rainfall or snowmelt. But scientists who specialize in computer climate models of the planet have been unable to reproduce an ancient climate with large amounts of liquid water present for long enough to account for the observed geology.
Osl dating of sediments from deserts in northern china Sex chat typing sites
ics or/and westerly airflow over China that follow the general trend of northern hemispheric insolation patterns (e.g. Chen et al.,. cene signals in proxy records from lake sediments as direct responses to Keywords. DGPS measurement, Gobi Desert, Holocene, Mongolian Plateau, OSL dating, paleolake shoreline.
This paper presents a preliminary study on lake-level fluctuations since the Last Glaciation in Selin Co lake , Central Tibet, by dating four groups of beach ridges using optically stimulated luminescence OSL. This date further supports that no plateau-scale ice sheet covered the Tibetan Plateau during the Last Glaciation. The other three groups produce OSL ages of On the plateau scale, these four beach ridge groups are almost synchronous with advances or standstills of Himalayan glaciers, indicating similar climate controls across the central and southern Tibetan Plateau, and being consistent with the conclusion, obtained from nearby ice core records, that this area is affected by the South Asia monsoon.
Furthermore, beach ridges are also synchronous with fluvial terraces in the northern Tibetan Plateau, implying common driving forces during their formation. Therefore, some terraces may be formed as a result of climate events rather than being of tectonic origin.
Department of Physics
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Li and Y. Chen and B. Li and Jm Sun and L.
In contrast to earlier assertions that deserts in northern China are years Lacustrine deposits exposed on the lake’s eastern shore, OSL-dated to between Pollen from lake sediments and 14C dating of preserved tree.
The sedimentary sequence and landscape of the Hobq desert was observed through twelve profiles along five N-S sections extending through the entire desert. Aeolian sands were found to overlie the alluvial, diluvial, and lacustrine sediments in this desert. The OSL ages reveal that the latest sand accumulation began around 19 ka in the northwestern part and 9 ka in the eastern part of the Hobq Desert.
Around 7 ka, the sand accumulation was strengthened and extended southward and northward 2 ka to develop the present desert landscape. Our study suggests that the aeolian sand accumulation around 19, 9 and 7 ka resulted from the weakening of the Asian summer monsoon over this region. However, the rapid development of the present Hobq desert landscape since 2 ka was likely triggered by human activities in this desert. Download to read the full article text.
Aitken M J. Thermoluminescence Dating. London: Academic Press.
Luminescence Dating: Applications in Earth Sciences and Archaeology
Deze blog is opgedragen aan mijn overleden echtgenote Lucienne. In verloor ze haar moedige strijd tegen kanker! In startte ik deze blog, omdat ik niet moc ht stoppen met mijn UFO-onderzoek. The objest had very bright light.
The 11th International Conference on Luminescence and Electron-Spin Resonance Dating (LED ), Cologne, Germany, 24 – 29 July
Clift; Assessing the provenance of loess and desert sediments in northern China using U-Pb dating and morphology of detrital zircons. GSA Bulletin ; : — Chinese loess is regarded as one of the most detailed and long-term archives of climate on land. However, there is still significant controversy over the deposit’s origin, limiting interpretation of the sedimentological and paleoclimatic mechanisms responsible for its emplacement. Here this is addressed through morphology and the first laser ablation—inductively coupled plasma—mass spectrometer LA-ICP-MS U-Pb ages of detrital zircons from loess last glacial age; northern Loess Plateau.
These are compared to zircon U-Pb age spectra from desert and sandy lands surrounding the Loess Plateau. Surface samples were taken from the Tengger and Mu Us deserts, as well as the Horqin and Otindag sandy lands. The results demonstrate that zircon U-Pb ages can discriminate between potential source areas and highlight both similarities and differences in age spectra for the desert and sandy land samples. Most significantly, the loess age spectrum shows no single affinity to any of these regions and exhibits zircon ages associated with granitoid rocks representing tectonic events in both west and east northern China.
Furthermore, and in contrast to proximal deserts, a significant proportion of zircons from the loess show affinities with rocks cropping out in the Qilian Mountains. The euhedral form of many of these grains further suggests direct transport from these crystalline source rocks, in contrast to previously hypothesized production or storage in deserts.
Thus, dust-transporting storms tracked from the west during the last glacial maximum, although this does not explain all the zircon variability and implies multiple sources and storm-track variation over the depositional period. Shibboleth Sign In. OpenAthens Sign In.
Canadian Journal of Earth Sciences
Physicists study the properties of matter and energy. They use the language of mathematics—codified logic—to describe and explain everything from the behavior of elementary particles to the structure of the observable universe. In this regard physics is the fundamental science as well as the quantitative discipline: Physicists can be found in such diverse occupations as medicine, finance, and engineering, to name a few.
Learn more about physics at ECU. Physics students at ECU can participate in a wide variety of activities to prepare them for their careers. Additionally, organizations such as the Society of Physics Students enhance the student experience through peer interaction and public outreach events.
Late Quaternary climate recorded in Chinese loess: OSL analysis of record desert sediments in northern China using U-Pb dating and.
AbstractThis study examines the feasibility of applying luminescence dating methods to quartz and potassium feldspar K-feldspar grains from Quaternary continental deposits of the Mejillones Peninsula and Coastal Cordillera in Central Atacama, northern Chile. The results of the analytical procedures indicate that quartz grains extracted from the studied sediments present a very weak or even no fast OSL component.
Fading rates for the pIRIR signal yielded variable results among sampling sites, with g-values ranging between 0. K-feldspar ages also allow to constrain the age of fault scarp degradation and fault reactivation in two main branches of the Atacama Fault System. Search All. Korean English. Journal Articles Save to my academic information. Selected option view options. Abstract open button. Abstract AbstractThis study examines the feasibility of applying luminescence dating methods to quartz and potassium feldspar K-feldspar grains from Quaternary continental deposits of the Mejillones Peninsula and Coastal Cordillera in Central Atacama, northern Chile.
Save to my academic information. Long-term persistence of subduction earthquake segment boundaries: Evidence from Mejillones Peninsula, northern Chile P.
Element ore crystal isles
Courtillot, V. On causal links between flood basalts and continental breakup, Earth Planet. Three-dimensional dynamical model of continental rift propagation and margin plateau formation, J.
Applicability of quartz OSL dating for the Bohai sediments. quartz OSL signal was fully reset for materials from the North Bohai Coast, while Origin of Eolian Sand Mobilization during the Past Years in the Mu Us Desert, China.
Deserts are widely distributed in northwestern China in a wide range of geomorphological and tectonic settings, from m below sea level to more than m above sea level asl. In this paper the author briefly reviewed some of the recent studies aiming to understand the formation and changes of the sand seas in northwestern China. Loess sequences in Loess Plateau indicated that deserts in western China may have existed already 22 Myr ago, but geomorphological and sedimentological evidence found in the deserts suggests a much younger age.
The geomorphological link between the Tertiary deserts and the present-day ones is not yet understood. In many parts of the deserts in northwestern China, late Pleistocene or even Holocene lacustrine and fluvial sediments are buried under the dunes, showing abrupt Late Quaternary environmental changes in the dune areas. Although the mechanisms for the formation of the megadunes in the Badain Jaran Desert are controversially argued in various publications – landforms control vs.
It is envisaged that geomorphology would be really crucial to the development of the Earth system sciences, dunes representing significant information archives for understanding the Earth system. Sincere thanks are extended to professors J. Thouret and A. Thouret who also kindly translated the parts of the manuscript required in French, and to Jufeng Dong for cartographical assistance. Goudie, In Chinese terminology Zhu et al.
Sandy deserts or sand seas occur mainly in three altitudinal zones in China.