Magnetostratigraphical dating of loess deposits in China

The aeolian deposits in the coastal region of North China are important for reconstructing paleoclimate. In this paper, chronology, climatic proxies and chemical compositions of four loess sections were studied. Optically stimulated luminescence OSL dating results indicate that the coastal loess was accumulated during late Quaternary, with ages ranging from the penultimate glacial period to the latest Holocene. Both granulometric characteristics and geochemical properties indicate that the dust provenance of the coastal loess is partially different from that of the Chinese Loess Plateau, characterized by more proximal contributions. Except distal dust transported by northwesterly winter winds from the inland gobi and sand deserts, the coastal loess also contains proximal, local coarse particles, which were derived from the exposed shelf as well as neighboring hills. Search All.

OSL Dating of Maibod Loess deposits and their formation interpretation

This study describes the luminescence characteristics of quartz of Upper Pleistocene loess of the Middle Rhine area. These weak calcaric cambisols and their derivates are underlain by loess and soil sediments of MIS 4 to MIS 5 and covered by loess sediments and intercalated gelic gleysols of MIS 2. We applied luminescence dating of quartz and feldspar of drill core samples and observed an age discrepancy within both data sets. The quartz ages were clearly younger than the feldspar ages, because of thermally unstable signal components of the quartz luminescence signal.

Therefore, we regarded the quartz samples of the lower parts of the drill core as unsuitable for luminescence dating.

Keywords: Dust flux; Peoria Loess; Optically stimulated luminescence dating; OSL; Quartz; size typically used for dating loess deposits since the Peoria.

This item is licensed under a Creative Commons License. Show full item record. OSL dating of loess deposits bracketing Sheep Creek tephra beds, Northwest Canada: dim and problematic single-grain OSL characteristics and their effect on multi-grain age estimates. Demuro, Martina Arnold, Lee J. Geochemically-fingerprinted tephra beds provide unique chronostratigraphic markers for comparing Quaternary sedimentary records across eastern Beringia Alaska and Yukon Territory.

Establishing reliable numerical age control on these tephra horizons enables them to be placed within firm temporal frameworks and increases their potential as correlative tools for regional palaeoenvironmental reconstructions. To this end we present new single-grain and multi-grain quartz optically stimulated luminescence OSL chronologies for loess deposits bracketing three well-documented and regionally significant variants of the Sheep Creek tephra SCt at two sites in west-central Yukon Territory Ash Bend and Quartz Creek.

In contrast, comparative chronologies obtained using multi-grain aliquots are stratigraphically inconsistent and unexpectedly young when compared with the independent SCt-K age. Synthetic aliquot De datasets constructed from single-grain OSL measurements reveal that the large proportional light sum contributions of 0 Gy and dim grains could possibly account for multi-grain age underestimations in some of the Ash Bend samples. In light of these potentially problematic averaging effects, we do not consider the multi-grain OSL ages to be reliable and suggest that single-grain approaches may be preferable for dating sediments with similar quartz luminescence behaviours across this region.

Loess deposits and wind-blown dust

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Abstract. This study describes the luminescence characteristics of quartz of Upper Pleistocene loess of the Middle Rhine area.

Wallner, E. Wild, H. Aref-Azar, P. Hille, W. For the younger soil Stillfried B StB the equivalent dose is measured by the additive method and the total bleach-regeneration method. For Stillfried A StA only the regeneration technique is available because of the non-linear growth of the dose response. Evaluation of the dose rates is done by thick source a counting and by gamma spectroscopy. Most users should sign in with their email address. If you originally registered with a username please use that to sign in.

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Radiocarbon

In many papers different authors was described problem of systematic underestimation of TL ages for sediments older then ka. We presented the results which probably are not significantly rejuvenated. This is another example of the TL dates made in Lublin laboratory which are likely in agreement with the stratigraphic interpretation. In Kusiak et al.

The luminescence dating has been supplemented by a detailed analysis of sedimentology, palaeopedology and stratigraphy allowing to interpret.

LOPES 1. In southern South America it occurs in Argentina, Bolivia, Paraguay and Uruguay, and its presence in southern Brazil was never studied in detail. It consists of fine-very fine silt with subordinate sand and clay, found mostly in lowland areas between Pleistocene coastal barriers. Caliche and iron-manganese nodules are also present.

The only fossils found so far are rodent teeth and a tooth of a camelid Hemiauchenia paradoxa. The probable source of this loess is the Pampean Aeolian System of Argentina and it would have been deposited by the increased aeolian processes of the last glacial. Loess is a type of sediment dominated by silt-sized particles 0,, mm in the scale of Wentworth , transported and accumulated by aeolian activity Pye , Muhs This material is divided in primary of aeolian origin and secondary primary loess that was re-worked and re-deposited by other mechanisms.

Although most loess deposits are found close to glaciated areas, formed by particles that were generated by frost weathering and mechanical grinding by glaciers, other deposits occur close to deserts, where processes such as insolation and salt weathering form silt-sized particles Tsoar and Pye , Iriondo a, Wright

References

Official websites use. Share sensitive information only on official, secure websites. Radiocarbon dating late Quaternary loess deposits using small terrestrial gastropod shells Quaternary Science Reviews.

Optically stimulated luminescence dating of late Quaternary loess deposits in the coastal region of North China: Provenance and paleoclimatic implications.

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. The age of Chinese loess deposits has long been disputed. Biostratigraphical and earlier magnetostratigraphical investigations placed the entire loess formation within the Pleistocene.

Luminescence Dating, Loess

Loess is an aeolian windborne sediment being an accumulation of: twenty percent or less clay and the balance mainly equal parts sand and silt typically from 20 to 50 micrometers per particle [3] [4] often loosely cemented by calcium carbonate chalk. It is usually homogeneous and highly porous and is traversed by vertical capillaries that permit the sediment to fracture and form vertical bluffs.

Loess is homogeneous , porous , friable , pale yellow or buff , slightly coherent , typically non- stratified and often calcareous.

Here, we present the results of a multi-faceted approach to understanding the potential for using small terrestrial gastropod shells to date loess deposits in North.

PL EN. Widoczny [Schowaj] Abstrakt. Adres strony. Luminescence dating of loess deposits from the Remagen-Schwalbenberg site, Western Germany. Klasen, N. This study describes the luminescence characteristics of quartz of Upper Pleistocene loess of the Middle Rhine area.

The Formation and Sustainability of Iowa’s Loess Hills