EG Quaternary Science Journal最新文献

{"title":"Reconsidering the origin of the Sedrun fans (Graubünden, Switzerland)","authors":"Catharina Dieleman, S. Ivy‐Ochs, K. Hippe, Olivia Kronig, F. Kober, M. Christl","doi":"10.5194/EGQSJ-67-17-2018","DOIUrl":"https://doi.org/10.5194/EGQSJ-67-17-2018","url":null,"abstract":"Four alluvial fans, Pulanera, L’Ondadusa, Drun and Bugnei, located near the town of Sedrun in the upper Vorderrhein Valley (Fig. 1), are striking in that they have a common aggradation surface (∼ 1 slope oriented along the main valley axis) and distinct coterminous cut-off toes. Similar coalesced fans with marked incised toes occur just downstream at Disentis (Fig. 2a). These geomorphological characteristics suggest that the fans built up for a limited period of time and then were abruptly incised by the Vorderrhein River. Switching between aggradation, fan abandonment and channel entrenchment can be a response to (1) variation in discharge due to climate changes or extreme precipitation events, (2) decreases in sediment supply reflecting waning (e.g. paraglacial) sediment availability, (3) tectonic uplift, or (4) changes in base level (Harvey et al., 2005; Hornung et al., 2010, and references therein). Inside a mountain range, change in local base level can be caused by large-scale downstream blockage by a glacier, a landslide or a man-made dam (Korup and Tweed, 2007). Previous work in the study area was focused on the bedrock (Huber, 1948), especially for characterization of the NEAT Gotthard basis tunnel site below Sedrun (Schneider, 1992, and references therein). In the northern tributary valleys (Val Giuv, Val Mila, Val Strem; Fig. 2a) Aar granite dominates, while strongly sheared metamorphic rocks of the Tavetscher Zwischenmassif underlie the Vorderrhein Valley itself. Along the trough shoulder, especially at Cuolm da Vi (Fig. 2a), active deep-seated slope degradation is present as evidenced by abundant trenches and uphill facing scarps (Amann et al., 2006). The aim of this study is to determine what caused this abrupt and apparently brief period of fan aggradation in the upper Vorderrhein. Previous researchers have interpreted the Sedrun and Disentis fans as kame terraces (Scapozza, 2012) or as Lateglacial outwash fans (Hantke, 1983). For the latter to be true the valley fill at Sedrun would have to be dominated by tributary valley sediment rather than Vorderrhein fluvial sediments. Both of these hypotheses require that the fans formed between about 17 and 11.7 kyr ago.","PeriodicalId":227489,"journal":{"name":"EG Quaternary Science Journal","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116920069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Capability of U–Pb dating of zircons from Quaternary tephra: Jemez Mountains, NM, and La Sal Mountains, UT, USA","authors":"J. Krautz, M. Hofmann, A. Gärtner, U. Linnemann, A. Kleber","doi":"10.5194/EGQSJ-67-7-2018","DOIUrl":"https://doi.org/10.5194/EGQSJ-67-7-2018","url":null,"abstract":"Abstract. Two Quaternary tephras derived from the Jemez Mountains, New Mexico – the\u0000Guaje and Tsankawi tephras – are difficult to distinguish due to their\u0000similar glass-shard chemical composition. Differences in bulk chemical\u0000composition are small as well. Here we examine the feasibility to assign an\u0000age to a distal tephra layer in the La Sal Mountains, Utah, by U–Pb dating\u0000of zircons and to correlate it with one of the two Jemez eruptions. We also\u0000dated original Jemez tephras for comparison. Even though the tephras are very\u0000young, we obtained reasonable age determinations using the youngest cluster\u0000of zircon grains overlapping in age at 2 σ . Thereafter, the Guaje\u0000tephra is 1.513  ±  0.021 Myr old. The La Sal Mountains tephra is\u0000correlated with the Tsankawi tephra. Three samples yielded a common age range\u0000of 1.31–1.40 Myr. All ages are in slight disagreement with published age\u0000determinations obtained by 40 Ar  ∕ 39 Ar dating. These findings\u0000indicate that distal Jemez tephras can be distinguished by U–Pb dating.\u0000Furthermore, we encourage giving this method a try for age assignments even\u0000of Quaternary volcanic material.","PeriodicalId":227489,"journal":{"name":"EG Quaternary Science Journal","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124638438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Middle to Late Holocene mobilization of DOC-bound Pb and Y in the Magellanic moorlands (53° S) as a function of sea spray fertilization, climate variations and volcanic fallout? A preliminary report","authors":"B. Klaes, R. Kilian, G. Wörner, S. Thiele-Bruhn, H. Arz","doi":"10.5194/EGQSJ-67-1-2018","DOIUrl":"https://doi.org/10.5194/EGQSJ-67-1-2018","url":null,"abstract":"Björn Klaes1, Rolf Kilian1, Gerhard Wörner2, Sören Thiele-Bruhn3, and Helge W. Arz4 1Department of Geology, University of Trier, Campus II, Geozentrum, Behringstraße 21, 54296 Trier, Germany 2Geochemistry Division, University of Göttingen, Goldschmidtstraße 1, 37077 Göttingen, Germany 3Soil Science Department, University of Trier, Campus II, Geozentrum, Behringstraße 21, 54296 Trier, Germany 4Department of Marine Geology, IOW Warnemünde, Seestraße 15, 18119 Rostock, Germany","PeriodicalId":227489,"journal":{"name":"EG Quaternary Science Journal","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115589464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Albrecht Penck: Vorbereiter und Wegbereiter der NS-Lebensraumpolitik?","authors":"H. Schultz","doi":"10.5194/EGQSJ-66-115-2018","DOIUrl":"https://doi.org/10.5194/EGQSJ-66-115-2018","url":null,"abstract":"Abstract. Albrecht Penck was one of the eminent representatives of Quaternary research in the first half of the twentieth century. But apart from this, there was a political-geographical side to Penck, which, since 1945, has long been ignored or downplayed by geographers. Today, given his concept of Volks- und Kulturboden, he is considered as having ushered in German geography the volkisch (ethno-nationalistic) turn. Thus, critics say, he paved the way for Nazi Lebensraum policies and became an accomplice in the resulting crimes. The present contribution examines Penck's political-geographical worldview and reaches an ambivalent conclusion regarding the accusations.","PeriodicalId":227489,"journal":{"name":"EG Quaternary Science Journal","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115026533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Leaf waxes from aeolianite–paleosol sequences on Fuerteventura and their potential for paleoenvironmental and climate reconstructions in the arid subtropics","authors":"J. Struck, Christopher-Bastian Roettig, D. Faust, R. Zech","doi":"10.5194/EGQSJ-66-109-2018","DOIUrl":"https://doi.org/10.5194/EGQSJ-66-109-2018","url":null,"abstract":"Julian Struck1,a, Christopher B. Roettig2, Dominik Faust3, and Roland Zech1,a 1Institute of Geography and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland 2Landscape Ecology, Dresden University of Technology, Dresden, Germany 3Physical Geography, Dresden University of Technology, Dresden, Germany anow at: Physical Geography, Friedrich-Schiller University, Jena, Germany","PeriodicalId":227489,"journal":{"name":"EG Quaternary Science Journal","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133856218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lipid biomarkers in aeolian sediments under desert pavements – potential and first results from the Black Rock Desert, Utah, USA, and Fuerteventura, Canary Islands, Spain","authors":"M. Lerch, M. Bliedtner, Christopher-Bastian Roettig, Jan-Uwe Schmidt, S. Szidat, G. Salazar, R. Zech, B. Glaser, A. Kleber, M. Zech","doi":"10.5194/EGQSJ-66-103-2018","DOIUrl":"https://doi.org/10.5194/EGQSJ-66-103-2018","url":null,"abstract":"Marcel Lerch1, Marcel Bliedtner2, Christopher-Bastian Roettig1, Jan-Uwe Schmidt1, Sönke Szidat3, Gary Salazar3, Roland Zech2,4, Bruno Glaser5, Arno Kleber1, and Michael Zech1,5 1Department of Geosciences, Institute of Geography, University of Technology Dresden, Helmholtzstraße 10, 01069 Dresden, Germany 2Institute of Geography and Oeschger Centre for Climate Change Research, Biogeochemistry and Palaeoclimatology Group, University of Bern, Hallerstrasse 12, 3012 Bern, Switzerland 3Department for Chemistry and Biochemistry and Oeschger Centre for Climate Change Research, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland 4Institute of Geography, Chair of Physical Geography, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany 5Institute of Agronomy and Nutritional Sciences, Soil Biogeochemistry, Martin Luther University Halle-Wittenberg, Von-Seckendorff-Platz 3, 06120 Halle (Saale), Germany","PeriodicalId":227489,"journal":{"name":"EG Quaternary Science Journal","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116117956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late Quaternary climate and environmental reconstruction based on leaf wax analyses in the loess sequence of Möhlin, Switzerland","authors":"L. Wüthrich, M. Bliedtner, I. Schäfer, J. Zech, Fatemeh Shajari, D. Gaar, F. Preusser, G. Salazar, S. Szidat, R. Zech","doi":"10.5194/EGQSJ-66-91-2017","DOIUrl":"https://doi.org/10.5194/EGQSJ-66-91-2017","url":null,"abstract":"Abstract. We present the results of leaf wax analyses (long-chain n-alkanes) from the 6.8 m deep loess sequence of Mohlin, Switzerland, spanning the last  ∼  70 kyr. Leaf waxes are well preserved and occur in sufficient amounts only down to 0.4 m and below 1.8 m depth, so no paleoenvironmental reconstructions can be done for marine isotope stage (MIS) 2. Compound-specific δ2Hwax analyses yielded similar values for late MIS 3 compared to the uppermost samples, indicating that various effects (e.g., more negative values due to lower temperatures, more positive values due to an enriched moisture source) cancel each other out. A pronounced  ∼  30 ‰ shift towards more negative values probably reflects more humid conditions before  ∼  32 ka. Radiocarbon dating of the n-alkanes corroborates the stratigraphic integrity of leaf waxes and their potential for dating loess–paleosol sequences (LPS) back to  ∼  30 ka.","PeriodicalId":227489,"journal":{"name":"EG Quaternary Science Journal","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128421935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Landscape evolution of the northern Alpine Foreland: constructing a temporal framework for early to middle Pleistocene glaciations","authors":"Anne Claude","doi":"10.5194/EGQSJ-66-69-2017","DOIUrl":"https://doi.org/10.5194/EGQSJ-66-69-2017","url":null,"abstract":"The Deckenschotter deposits are believed to represent the oldest Quaternary sediments in the Alpine Foreland and are thus a geoarchive, documenting paleoenvironmental changes during the Quaternary. Lithostratigraphic positions of the Deckenschotter deposits in Switzerland have been extensively studied. However, compared to late Quaternary glaciations, the timing of these accumulations is poorly understood. The investigations related to the dissertation shed light on this timing and hence on the landscape evolution of the northern Alpine Foreland. The study area is located in the northern Alpine Foreland of Switzerland where seven sites of the Höhere (“higher”; HDS) Deckenschotter, Tiefere (“lower”; TDS) Deckenschotter and Hochterrasse (“higher terrace”) were investigated; from east to west, these sites are Irchel (three sites: Wilemer, Steig and Hütz), Stadlerberg, Siglistorf, Rechberg, Ängi, Mandach and Pratteln (Hohle Gasse) (Fig. 1). From each site either sediment samples were collected for dating with cosmogenic 10Be and/or 36Cl depth-profile dating or clasts with quartz-rich lithologies were sampled for isochron burial dating with 10Be and 26Al. At Irchel Steig, the same outcrop was dated using both methods. In addition, detailed investigations of clast fabrics, petrographic compositions and clast morphometries enable the identification of sediment source areas and the interpretation of their transport mechanisms and depositional environments. Finally, coupling the reconstructed chronologies with interpolated vertical height differences between the bedrock underlying the Deckenschotter deposits and the bedrock beneath the modern Rhine River allows for the estimation of post-depositional bedrock incision rates. Analyses show that the HDS at Wilemer Irchel (Claude et al., 2017c), Stadlerberg (Claude et al., 2017a) and Siglistorf (Akçar et al., 2017) accumulated approximately around 2 Ma ago. Clasts were eroded from the northern Central Alps and brought to the foreland by paleoglaciers (Fig. 2a). In the foreland, glaciers also eroded conglomerates of the Miocene Molasse and transport was furthermore provided by glacial outwash. The influence of mainly the Linth paleoglacier is recognized in the provenance of the sediments. Clasts at the sites Wilemer Irchel, Stadlerberg and Siglistorf were deposited in a glacier-proximal environment. At that time, the Alpine Rhine, originating in the central Eastern Alps, was draining through Lake Constance into the Danube River and finally eastwards into the Black Sea (Fig. 2a). Estimated longterm bedrock incision rates are on the order of 130 ± 60– 150 ± 40 m Ma−1 for the time interval from 2 Ma until the","PeriodicalId":227489,"journal":{"name":"EG Quaternary Science Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125875558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"10 Be depth profiles in glacial sediments on the Swiss Plateau: deposition age, denudation and (pseudo-) inheritance","authors":"L. Wüthrich, C. Brändli, R. Braucher, H. Veit, N. Haghipour, C. Terrizzano, M. Christl, Christian Gnägi, R. Zech","doi":"10.5194/EGQSJ-66-57-2017","DOIUrl":"https://doi.org/10.5194/EGQSJ-66-57-2017","url":null,"abstract":"Abstract. During the Pleistocene, glaciers advanced repeatedly from the Alps onto the Swiss Plateau. Numeric age control for the last glaciation is good and thus the area is well suited to test a method which has so far not been applied to till in Switzerland. In this study, we apply in situ produced cosmogenic 10Be depth profile dating to several till deposits. Three sites lie inside the assumed Last Glacial Maximum (LGM) extent of the Rhone and Aare glaciers (Bern, Deisswil, Steinhof) and two lie outside (Niederbuchsiten, St. Urban). All sites are strongly affected by denudation, and all sites have reached steady state, i.e., the 10Be production is in equilibrium with radioactive decay and denudational losses. Deposition ages can therefore not be well constrained. Assuming constant denudation rates of 5 cm kyr−1, total denudation on the order of 100 cm for sites within the extent of the LGM and up to tens of meters for older moraines are calculated. Denudation events, for example related to periglacial conditions during the LGM, mitigate the need to invoke such massive denudation and could help to explain high 10Be concentrations at great depths, which we here dub pseudo-inheritance . This term should be used to distinguish conceptionally from true inheritance , i.e., high concentrations derived from the catchment.","PeriodicalId":227489,"journal":{"name":"EG Quaternary Science Journal","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126970552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Palaeoenvironments during MIS 3 and MIS 2 inferred from lacustrine intercalations in the loess–palaeosol sequence at Bobingen (southern Germany)","authors":"C. Mayr, Renate Matzke-Karasz, P. Stojakowits, S. Lowick, B. Zolitschka, Tanja Heigl, Richard Mollath, Marian Theuerkauf, M. Weckend, R. Bäumler, H. Gregor","doi":"10.5194/EGQSJ-66-73-2017","DOIUrl":"https://doi.org/10.5194/EGQSJ-66-73-2017","url":null,"abstract":"Abstract. Recently exposed loess–palaeosol sequences in the northern Alpine foreland close to Bobingen (southern Germany) were investigated with a multi-proxy approach combining isotopic, geochemical, lithological, and micropalaeontological methods. Luminescence ages date the sections into the Middle and Upper Wurmian periods corresponding to Marine Isotope Stages 3 and 2. A gleyic soil horizon at the base was dated to 45 ka and provided a palynoflora dominated by Poaceae, Cyperaceae, and Pinus, as well as frequent aquatic taxa. Lacustrine conditions prevailed after the gley formation until 30 ka, providing a comparatively diverse lacustrine fauna dominated by aquatic gastropods and the ostracod species Candona candida. At the transition to the Upper Wurm, climatic conditions became harsh, indicated by accelerated deposition of more coarse-grained loess, organic geochemical indicators, and scarceness of biotic remains. Two tundra-gley horizons in the Upper Wurm point to short phases of climatic amelioration with higher humidity also evidenced by reoccurrence of ostracod and aquatic gastropod remains. We propose that these climatic ameliorations were coincident with the Greenland interstadials 4 and 2.","PeriodicalId":227489,"journal":{"name":"EG Quaternary Science Journal","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128303998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}