Frechen, Leibniz Institute for Applied Geophysics (LIAG), Geochronology c Germany. [email protected] Hydrology, Stilleweg 2, 30655 Hannover, The papers of this Special Issue give remarkable new results and conclusions on loess from Europe underlining the excel- lence of loess archives for past climate and environment re- constructions from a local and regional perspective and their relationship to a more global interpretation (Frechen 2011 a, b). (2002): The loess profile at Al- bertirsa, Hungary - improvements in loess stratigraphy by lumines- cence dating. The uppermost 46 cm are made up of a colluvial cover layer. The profile is carbonate-free and the organic content ranges be- tween weak to strong humic. The D e -s obtained using the IR 50 from feldspar range from 52.9 ± 1.3 Gy to 423 ± 4 Gy.
It took until the end of the 19 th century until the aeolian origin of loess was recognized (Virlet D Aoust 1857), especially the convincing observa- tions of loess in China by Ferdinand von Richthofen's (1878). - Edinburgh New Philosophical Journal, 17: 110-113, 118-120. Oxalate Fe and dithionite Fe d extractable iron (Holmgren 1967) were measured by induc- tively coupled plasma spectrometry (ICP). The characteristic saturation doses (D ) are about -450 Gy for the IR 50 and the p IRIR 225 .Wagner (this issue) carried out a spatial compilation and visualisation of loess parameters for loess and loess-like sediments in the Weser-Aller catchment, including parts of southern Lower Saxony and northern Hesse in Northwest Germany. Luminescence age estimates are provided by Degering & Krbetschek (2007a) on two samples with a depth of 104.5 m and 122.5 m from core JW2 yielding equi-valent doses (D e ) of 441 ± 49 Gy and 517 ± 62 Gy. For sample Wei7 the IR 50 un- derestimates the p IRIR 225 . 2) is older than -200 ka and was most likely developed during the antepenul- timate or penultimate interglacial.In this study, very detailed maps of loess prop- erty patterns including loess thickness, granulometry and stratigraphy were collected from publications and historical- ly maps published between 18 resulting in more than 600 loess locations providing the base information for the area under study. B0.1.00 /©Authors/ Creative Commons Attribution License present a new composite profile including new stratigraph- ic marker horizons and palaeosols. Age estimates of 98 ± 15 ka and 117 ± 18 ka were calculated for these samples. Our interpretation is hence based on the fading corrected p IRIR 225 age estimates (Fig. Sample Wei7, which was taken from the calcareous loess covering E&G/Vol. The humic-rich horizon is covered by a solifluction layer of reworked humic-rich mate- rial including loess loam and calcareous loess (Sample Wei5 was taken from this horizon, 5 in Fig. This layer yielded an age estimate of 202 ± 14 ka and is covered by about 50 cm thick reworked loess (Wei4) with macroscopically visible pseudomicelium, which gives an age estimate of 203 ± 22 ka.the time elapsed since the last exposure of the mineral grains to day- light. There is considerable evidence in the literature that the IR 50 from loess and from sediments originating from dust storms is well bleached (Roberts, 2008). For sample Wei7 the IR 50 underestimates the p IRIR 225 .During the past decade luminescence dating has sig- nificantly improved by new methodological improvements, especially the development of single aliquot regenerative (SAR) protocols (Murray & Wintle 2000) resulting in reli- able ages (or age estimates) with an accuracy of up to 5 and 10% for the last glacial record. this issue) allowing for a reliable cor- relation of loess/palaeosol sequences for at least the last two interglacial/glacial cycles throughout Europe and the North- ern Hemisphere (Frechen 2011a). It is also known that the fast component of quartz can be depleted in only a few minutes exposure to daylight (Godfrey-Smith et al, 1988) and yet we still obtain an equivalent dose for the fine-grain quartz of 441 ± 28 Gy giving a minimum age estimate of ~ 100 ka based on the 2D value of -260-300 Gy for the youngest sample. In- frared stimulated luminescence dating of an Eemian (MIS 5e) site in Denmark using K-feldspar. We assume that the fading corrected p IRIR 225 values yield more reliable age estimates.The loess/palaeosol sequences from Saxony were re-in- vestigated by Meszner, Fuchs & Faust (this issue), who E&G /Vol. They identified three palaeosols for the so far poorly differentiated Weichselian Pleniglacial record in Saxony. To enable comparison of our results for samples from the drill core JW3 and the pub- lished age estimates of Degering & Krbetschek (2007a) we additionally measured one sample (JWT9) from drill core JW2 taken from a depth of 104.5 m. These layers can probably be correlated with a cold phase during MIS 7.
In the Lower Rhine Embayment, detailed loess/palale- osol sequences have been described from the km-wide ex- posures of the brown coal open-cast mines and from many brickyards, e.g. Most of the studied sections give evidence for rich Palaeo- lithic (and younger periods) artefacts and settlement struc- tures. The results show that this sample is in saturation for all the different signals, IR 50 , p IRIR 225 and for p IRIR 290 suggesting a minimum age estimate of -270 ka for p IRIR 290 signal for this sample. It has to be mentioned that samples Wei5 and Wei4 were taken from reworked material.
49 [0J3834-80 40 80 E-Mail: info [at] Printed in Germany on 100% recycled paper climate neutral produced COVER PHOTO Juliane Herrmann [LIAG] Aufschlul S Sutto in Nordungarn RIGHTS Copyright for articles by the authors LICENSE Distributed under a Creative Commons Attribution License 3.0 1 and 2), soil colour was determined by Munsell soil colour charts. 2 and 4) (53.08°N, 10.52°E, 38 m a.s.l.) is located on a slip-off slope in a floodplain of a small watercourse close to the village of Seed- orf in the western part of the Liineburg Heath. This dose was then measured in the same manner as the equivalent dose in or- 120 E&G/Vol. This data indicates the applicability of the post-IR IRSL protocol. 9 ± 1.3 Gy to 14.9 ± 2.1 Gy, with a mean of 12.7 ± 0.5 Gy (n = 7) for p IRIR 225 .
Org/licenses/by/3.0/ E&G Quaternary Science Journal Volume 60 / Number 1 / 2011 / 3-5 / DOI 10.3285/eg.6D.1.0D SCIENCE MEDIA ISSN 0424-7116 Loess in Europe Guest Editorial Manfred Frechen Address of author: M. The sequence consists of 1.75 m thick silty, clayey soil-sediment with fluvic and gleyic features. To confirm that the IRSL and the post-IR IRSL are bleachable by natural daylight we exposed three aliquots per sample for four hours to a Honle SOL2 solar simulator and then measured the apparent dose in the usual manner. Equivalent Dose (D e ), fading rates and age estimates In Table 3 the equivalent doses, dose recovery results, re- sidual doses, g-values and the resulting luminescence ages, both uncorrected as well as fading corrected, are summa- rized for all samples.
Eight weak interstadial palaeosols including Ah and Bcv (calcic cambisol) horizons are inter- calated in loess and reworked loess. (this issue): Late Pleistocene-Holocene History of Chaco- Pampa Sediments in Argentina and Paraguay. - Geologiske Foreningen Foerhandlingar, 92: 148-180; Stockholm. In our view the post-IR IRSL ages represent the most secure ages for this deposit. Sirocko) does not agree with this interpretation and proposes an alternative stratig- raphy for core JW3 and neighbouring core JW2 (see appen- dix). The last interglacial soil (MIS 5) and the deposits of the lower Wiirmian are missing in this profile. Marengo, Fernando Pereyra Abstract: Kurzfassung: Keywords: A substantially improved reconstruction of the Late Pleistocene-Holocene morphological and geological history of the Para- guayan Chaco and the Argentine Pampa Plain (Chaco-Pampa Plain) is presented.
The chronostratigraphi- cal units show little or no age increase with depth indicat- ing fast accumulation of sediment and fast formation of the soils; similar observations were made for the Early Weichse- lian record at the Tonchesberg section (Boenigk & Frechen 2001). 6 Conclusion We have investigated the application of luminescence dat- ing to maar lake sediments from the dry maar Jungfern- weiher in the West Eifel volcanic field by using quartz OSL and two different protocols for feldspar IRSL. (1984): Die Maare im Vulkanfeld der Westeifel, ihr geo- physikalischer Nachweis, ihr Alter und ihre Beziehung zur Tektonik der Erdkruste. Bibus, Rahle & Wedel (1996, 2002) provid- ed a detailed description of the latter ones from the Mainz- Weisenau section and Frechen & Preusser (1996) provide TL and IRSL age estimates ranging from 68-113 ka for these deposits. 1.12 / ©Authors / Creative Commons Attribution License 187 E&G Quaternary Science Journal Volume 60 / Number 1 / 2011 / 188-202 / DOI 10.3285/eg.60.1.13 SCIENCE MEDIA ISSN 0424-7116 Late Pleistocene-Holocene History of Chaco-Pampa Sediments in Argentina and Paraguay Wolfgang Kruck, Fabian Helms, Mebus A. Due to the vast extension of the area, satellite images are the clue to synthesize previous and new multidisciplinary geoscientific results to set up a more reliable regional picture.
According to Pye (1995) four fundamental requirements are necessary for it formation: a dust source, adequate wind en- ergy to transport the dust, a suitable accumulation area, and a sufficient amount of time. (2000): Luminescence dating of quartz us- ing an improved single aliquot regenerative-dose protocol. The Ap and the Bgl horizon are developed in a loess colluvium (M-Go). 01 /© Authors / Creative Commons Attribution License Eutric Histosols Cambisols Gleysols Luvisols Stagnic Luvisols Podzols, Cambisols Fig. 2.2 Sedimentological and pedological analysis The texture of the horizons was determined by the hydrome- ter method (van Reeuwijk 1992). (2004): Luminescence dating of quaternary sediments: re- cent advances. D e values obtained for the IR 50 increase clearly with depth from sample Weil to sample Wei5.