Journal of Quaternary Science最新文献_第9页

Preservation of plant-wax biomarkers in deserts: implications for Quaternary environment and human evolutionary studies 沙漠中植物蜡生物标志物的保存：对第四纪环境和人类进化研究的影响

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2024-02-01 DOI: 10.1002/jqs.3597

Deepak Kumar Jha, Robert Patalano, Jana Ilgner, Hema Achyuthan, Abdullah M. Alsharekh, Simon Armitage, James Blinkhorn, Nicole Boivin, Paul S. Breeze, Ravindra Devra, Nicholas Drake, Huw S. Groucutt, Maria Guagnin, Patrick Roberts, Michael Petraglia

{"title":"Preservation of plant-wax biomarkers in deserts: implications for Quaternary environment and human evolutionary studies","authors":"Deepak Kumar Jha, Robert Patalano, Jana Ilgner, Hema Achyuthan, Abdullah M. Alsharekh, Simon Armitage, James Blinkhorn, Nicole Boivin, Paul S. Breeze, Ravindra Devra, Nicholas Drake, Huw S. Groucutt, Maria Guagnin, Patrick Roberts, Michael Petraglia","doi":"10.1002/jqs.3597","DOIUrl":"10.1002/jqs.3597","url":null,"abstract":"Analysis of plant-wax biomarkers from sedimentary sequences can enable past environmental and hydrological reconstruction and provide insights into past hominin adaptations. However, biomarker preservation in desert contexts has been considered unlikely given the sparse nature of the vegetation within the landscape. Here we evaluate the preservation of n-alkanes and fatty acids collected from four depositional sequences associated with archaeological contexts in the Nefud Desert, Saudi Arabia, and the Thar Desert, India. Pleistocene and Holocene samples were selected to understand the effects of age on preservation. The results of molecular distribution patterns and indices, particularly the high carbon preference index and average chain length, show the preservation of plant-wax biomarkers in both the Holocene and Pleistocene desert sequences, while δ13C values and organic content provide insights into the vegetation contributing to the plant-wax organic pool. This study provides a baseline for understanding human–environment interactions and for reconstructing changes in arid land habitats of relevance to hominins during the Quaternary.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 3","pages":"349-358"},"PeriodicalIF":2.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3597","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139656547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The southern Brazilian tropical forest during the penultimate Pleistocene glaciation and its termination 巴西南部热带森林在更新世倒数第二次冰川时期及其终结

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2024-01-31 DOI: 10.1002/jqs.3594

Adriana Mercedes Camejo Aviles, Marie-Pierre Ledru, Fresia Ricardi-Branco, Gisele C. Marquardt, Denise de Campos Bicudo

{"title":"The southern Brazilian tropical forest during the penultimate Pleistocene glaciation and its termination","authors":"Adriana Mercedes Camejo Aviles, Marie-Pierre Ledru, Fresia Ricardi-Branco, Gisele C. Marquardt, Denise de Campos Bicudo","doi":"10.1002/jqs.3594","DOIUrl":"10.1002/jqs.3594","url":null,"abstract":"To describe the composition of the penultimate glacial Brazilian Atlantic forest, we analyzed pollen, charcoal and diatoms deposited in the section from 871 to 1400 cm of core CO14 drilled in the Colônia basin in southeastern Brazil. The landscape was characterized by a cool grassland with three conifer genera: Araucaria, Podocarpus and Ephedra. Total arboreal pollen frequency did not change during the transition from glacial to interglacial conditions. Changes in Podocarpus frequency and concentration showed out-of-phase responses with austral summer insolation at an orbital scale while, at a millennial scale, both northern and southern hemisphere ice volume controlled the interplay between positions of the Inter-Tropical Convergence Zone and South Tropical Front (STF), which in turn defined the latitudinal distribution of rainfall. The disappearance of Podocarpus and the decrease of Araucaria observed between ~167 and 160 ka were related to a dry interval which was not observed elsewhere. During Termination II a progressive decrease in conifer pollen taxa was in phase with a southward shift in the STF and increase in Atlantic sea surface temperatures. Our results show that southern hemisphere conifer distribution is strongly linked to austral summer insolation and winter precipitation and will be threatened by the southward expansion of the summer rainfall boundary.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 3","pages":"373-385"},"PeriodicalIF":2.3,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3594","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139659347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First reported fossil occurrences of Phrynosoma sp. from the Columbia Plateau (Washington State, USA) dated to the Late Pleistocene 哥伦比亚高原（美国华盛顿州）首次发现的麒麟座化石，年代为晚更新世

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2024-01-29 DOI: 10.1002/jqs.3595

Audra J. Richter, Brian J. Pickles, Bax R. Barton

{"title":"First reported fossil occurrences of Phrynosoma sp. from the Columbia Plateau (Washington State, USA) dated to the Late Pleistocene","authors":"Audra J. Richter, Brian J. Pickles, Bax R. Barton","doi":"10.1002/jqs.3595","DOIUrl":"10.1002/jqs.3595","url":null,"abstract":"Reptiles, squamates in particular, can be extremely valuable as indicator species due to their commonly small fundamental niche ranges. Yet these taxa are often overlooked in North American Cenozoic palaeoecological studies in favour of mammalian specimens. At the Coyote Canyon Mammoth Site (CCMS) on the Columbia Plateau (eastern Washington State, USA) excavation has focused on the collection and subsequent identification of all diagnostic fossil specimens, whether associated directly with the mammoth remains or not, including small non-mammalian vertebrates and invertebrates. Here we show that with appropriate excavation techniques, microvertebrate fossils are recoverable and can be identified to at least the genus level. We place the identification of two fossils of Phrynosoma at the CCMS, dated to ~13 and 15 ka, in the context of all recorded fossils identified to this genus in North America since the Middle Miocene. These specimens represent the first fossils of Phrynosoma adequately described and reported from the Columbia Plateau and the greater Pacific Northwest.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 3","pages":"397-407"},"PeriodicalIF":2.3,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3595","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139648535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Forest fires in southwest Western Siberia: the impact of climate and economic transitions over 9000 years 西西伯利亚西南部的森林火灾：9000 年来气候和经济转型的影响

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2024-01-22 DOI: 10.1002/jqs.3593

N. E. Ryabogina, M. I. Nesterova, R. R. Utaygulova, E. D. Trubitsyna

{"title":"Forest fires in southwest Western Siberia: the impact of climate and economic transitions over 9000 years","authors":"N. E. Ryabogina, M. I. Nesterova, R. R. Utaygulova, E. D. Trubitsyna","doi":"10.1002/jqs.3593","DOIUrl":"10.1002/jqs.3593","url":null,"abstract":"<div>\u0000 \u0000 Here we compare the long-term dynamics of fires in the southern taiga of Western Siberia with changes in the environment and ancient economies. Utilizing charcoal particles extracted from peat sediments, we assess charcoal accumulation rates to identify the neighborhood level of fires. Comparison of changes in vegetation, climate and land-use history with fire dynamics reveals that wildfires were climate-dependent but inconsequential during the first half of the Holocene (9.0–4.1k cal a bp) in the hunter-gatherer period. Critical changes and a notable increase in fires were observed in the Late Holocene when pyrogenic events correlate poorly with changes in vegetation cover and climate. Nevertheless, after 4.1k cal a \u0000bp, a direct relationship between fire frequency and economic features emerged, primarily linked to the introduction of animal husbandry and metallurgy, along with an increase in the number of settlements. Subsequently, fire activity increased, remaining higher even during periods of cooling and increased humidity, and this appears to have been related more closely to the economic strategies and periods of depopulation. Thus, even in Siberia, where agriculture had not been practised until the last few centuries, the transition to a productive economy in the Bronze Age brought decisive changes in the dynamics of forest fires.</div>","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 3","pages":"432-442"},"PeriodicalIF":2.3,"publicationDate":"2024-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139517508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Configuration and timing of the postglacial marine incursion along the eastern Ungava Peninsula (Nunavik, Canada): implications for deglaciation models 冰期后海洋入侵沿翁加瓦半岛东部（加拿大努纳维克）的构造和时间：对脱冰期模型的影响

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2024-01-12 DOI: 10.1002/jqs.3591

Claudie Lefebvre-Fortier, Martin Roy, Hugo Dubé-Loubert, Etienne Brouard, Joerg M. Schaefer

{"title":"Configuration and timing of the postglacial marine incursion along the eastern Ungava Peninsula (Nunavik, Canada): implications for deglaciation models","authors":"Claudie Lefebvre-Fortier, Martin Roy, Hugo Dubé-Loubert, Etienne Brouard, Joerg M. Schaefer","doi":"10.1002/jqs.3591","DOIUrl":"10.1002/jqs.3591","url":null,"abstract":"The final deglaciation stages of the Laurentide Ice Sheet in northern Quebec–Labrador were marked by the incursion of the d'Iberville Sea into the coastal areas of Ungava Bay. Remote and field mapping of raised marine strandlines along the Ungava Peninsula east coast show that the maximum marine limit decreases from south (165 m) to north (100 m), reflecting differential uplift linked to an ice mass remnant located to the southwest of the bay. Reconstruction of the uppermost marine limit in two east–west transects extending into the Peninsula interior reveals distinct sea-level stands with limited extents towards the west, indicating that the early stages of the marine incursion occurred in contact with the ice margin. The reconstruction also identifies the maximum eastward extent of ice-dammed lakes that occupied the Arnaud River and Aux-Feuilles River valleys. 10Be surface exposure dating of marine strandlines yielded consistent 10Be ages that indicate a rapid deglaciation of Ungava Bay between 8900 ± 200 a (north) and 7900 ± 200 a (south). These results provide constraints on the position of the Labrador Sector eastern and western ice margins during the late deglaciation, in addition to the timing of ice and meltwater discharges from the Ungava Bay region.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 3","pages":"359-372"},"PeriodicalIF":2.3,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3591","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139461218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Late MIS5a in the southern North Sea: new chronostratigraphic insights from the Brown Bank Formation 北海南部的 MIS5a 晚期：布朗银行地层的年代地层学新见解

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2024-01-08 DOI: 10.1002/jqs.3592

Irene M. Waajen, Freek S. Busschers, Timme H. Donders, Sytze Van Heteren, Ruth Plets, Jakob Wallinga, Rick Hennekam, Gert-Jan Reichart, Tim Kinnaird, Friederike Wagner-Cremer

{"title":"Late MIS5a in the southern North Sea: new chronostratigraphic insights from the Brown Bank Formation","authors":"Irene M. Waajen, Freek S. Busschers, Timme H. Donders, Sytze Van Heteren, Ruth Plets, Jakob Wallinga, Rick Hennekam, Gert-Jan Reichart, Tim Kinnaird, Friederike Wagner-Cremer","doi":"10.1002/jqs.3592","DOIUrl":"10.1002/jqs.3592","url":null,"abstract":"The Brown Bank Formation (BB Fm) is a clay-rich sedimentary unit that is distributed over a large area in the southern North Sea. It is easily recognisable in 2D acoustic reflection profiles, forming sets of subparallel high-amplitude reflections. Previous studies have provided only fragmentary information on the facies, and a variety of interpretations on the depositional environment and age of the BB Fm. In this study we combine high-resolution 2D acoustic reflection profiles and multiproxy sedimentological, geochemical and geochronological analyses of three vibrocores, to provide a detailed description and a new age assessment for the BB Fm at its type locality, adjacent to the Brown Bank ridge. At the study site, the BB Fm shows morphologically well-preserved submarine sand dunes, deposited in a high-energy shelf setting, overlain by organic-rich silty clays that were deposited under lower-energy conditions in an increasingly compartmentalised marginal marine environment. Elevated terrestrial organic input shows that the Rhine–Meuse delta was situated relatively close-by. Luminescence ages indicate that the sediments of the BB Fm in our cores were deposited during the Weichselian Odderade interstadial (MIS5a, ca. 80 ka) and earliest parts of the Early Pleniglacial (MIS4, ca. 70 ka), which is later than previously reported in the literature.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 3","pages":"408-420"},"PeriodicalIF":2.3,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3592","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139397542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vertical acoustic blanking in seismic data from the German North Sea: a spotlight to shallow gas-bearing incised channels 德国北海地震数据中的垂直声波消隐：浅层含气切槽的聚焦点

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2024-01-08 DOI: 10.1002/jqs.3590

Niklas Ahlrichs, Axel Ehrhardt, Michael Schnabel, Christian Berndt

{"title":"Vertical acoustic blanking in seismic data from the German North Sea: a spotlight to shallow gas-bearing incised channels","authors":"Niklas Ahlrichs, Axel Ehrhardt, Michael Schnabel, Christian Berndt","doi":"10.1002/jqs.3590","DOIUrl":"10.1002/jqs.3590","url":null,"abstract":"Seismic data from the North Sea commonly show vertical acoustic blanking (VAB) often interpreted as fluid conduits with implications for Quaternary development. The robustness of this interpretation has long been controversial as the infill of tunnel valleys can also cause vertical blanking. Using 2D and 3D seismic data and sediment echosounder data from the German North Sea, we investigate VAB to determine a geological or imaging origin of these anomalies. We detected multiple VAB occurrences throughout the North Sea. 3D data from the Ducks Beak (‘Entenschnabel’) reveal a correlation of VAB with bright spots in incised channels directly below the seafloor. Large source–receiver distances allow imaging the subsurface below the channel without signal penetrating through it (undershooting). This method removes the blanking. Energy absorption by shallow biogenic gas trapped within the channels explains the observed VAB. Hence, the blanking represents an imaging artifact, highlighting the need for careful seismic processing with sufficient offset before interpreting such anomalies as fluid pathways. The channels belong to a postglacial channel system related to the now submerged lowlands of Doggerland. This work demonstrates the usability of mapping VAB to detect shallow features for paleo-landscape reconstruction and identification of shallow gas for hazard assessments, for example.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 3","pages":"421-431"},"PeriodicalIF":2.3,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3590","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139397469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Where did the water come from? Wetlands and shallow lakes in semi-arid dunefields from South America during the Pleistocene–Holocene transition 水从哪里来？更新世-全新世过渡时期南美洲半干旱荒原中的湿地和浅湖

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2024-01-08 DOI: 10.1002/jqs.3588

Alfonsina Tripaldi, Ivana L. Ozán, Guillermo Heider, María J. Orgeira, Steven L. Forman

{"title":"Where did the water come from? Wetlands and shallow lakes in semi-arid dunefields from South America during the Pleistocene–Holocene transition","authors":"Alfonsina Tripaldi, Ivana L. Ozán, Guillermo Heider, María J. Orgeira, Steven L. Forman","doi":"10.1002/jqs.3588","DOIUrl":"10.1002/jqs.3588","url":null,"abstract":"<div>\u0000 \u0000 Stabilized and active dunes and sand sheet deposits abound in a small lake-dotted semi-arid region of the Western Pampean Dunefield, Argentina. Here, a multi-scale and multi-proxy study of three sites, across a hydrologic gradient from lakes to a dryland with groundwater levels at more than 25 m depth, analyzes calcareous and ferruginous rhizoliths, calcareous crusts, hypocoatings, pedogenic carbonate and amorphous Mn-oxide precipitates within blowout dunes. These palustrine-related features indicate significantly wetter conditions that allowed the development of shallow lakes and expanding wetlands during the Pleistocene–Holocene transition, limited by associated optically stimulated luminescence ages between ca. 14.7 and 11.6 ka. These wetter conditions, also identified in other nearby proxy records, may be associated with a strengthened South American Monsoon System, potentially during the Younger Dryas Chronozone, though other geological, ecological and climatic forcings cannot be ruled out with available data. Such a scenario lacks a modern analogue, since current hydrologic excess, evidenced in the formation of lakes and new rivers, is not observed in the localities which record paleolakes. This study underlines the variable conditions for pronounced hydrologic excess in semi-arid eolian environments in western Argentina with complex ecological, anthropogenic and climatic linkages.\u0000 </div>","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 2","pages":"289-308"},"PeriodicalIF":2.3,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139413595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of flooding variability on the development of an Amazonian peatland 洪水多变性对亚马逊泥炭地发展的影响

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2023-12-28 DOI: 10.1002/jqs.3587

D. Sassoon, W. J. Fletcher, K. H. Roucoux, P. Ryan, I. T. Lawson, E. N. Honorio Coronado, J. Del Aguila Pasquel, T. Bishop, C. M. Åkesson, A. Hastie

{"title":"Influence of flooding variability on the development of an Amazonian peatland","authors":"D. Sassoon, W. J. Fletcher, K. H. Roucoux, P. Ryan, I. T. Lawson, E. N. Honorio Coronado, J. Del Aguila Pasquel, T. Bishop, C. M. Åkesson, A. Hastie","doi":"10.1002/jqs.3587","DOIUrl":"10.1002/jqs.3587","url":null,"abstract":"Peat in the Pastaza–Marañón Foreland Basin (PMFB), northern Peru, forms beneath open wetlands, palm swamps, pole forests and seasonally flooded forests. These vegetation communities may represent different successional stages of peatlands, but the spatiotemporal patterns of peatland development in Amazonia are still poorly understood. We present a new geochemical and palaeoecological record spanning the last c. 4330 years from an open peatland (San Roque, core SAR_T3_03_B). Our results suggest the persistence of predominantly herbaceous vegetation communities at the core site since the start of peat accumulation (c. 3180 cal a bp). Micro-X-ray fluorescence core scanning provides evidence for episodes of fluvially derived minerogenic input and simultaneous increases in flood-tolerant taxa relating to intervals of increased frequency and depth of riverine flooding. The establishment of Mauritia flexuosa palms from around 440 cal a bp coincided with a shift to lower flooding depth and frequency which continues to the present day. This study reveals the role of flooding variability in shaping peatland development and influencing vegetation succession in the PMFB, underlining the need to understand natural environmental variability for the conservation of these ecosystems due to their vital contributions to ecosystem services and carbon storage.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 2","pages":"309-326"},"PeriodicalIF":2.3,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3587","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid deglaciation of the La Vega gorge (Sierra de Gredos, Iberian Peninsula) at the end of the global Last Glacial Maximum 全球末次冰川极盛期末期拉维加峡谷（伊比利亚半岛格雷多斯山脉）的快速冰川消融现象

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2023-12-20 DOI: 10.1002/jqs.3584

Jesús Alcalá-Reygosa, Néstor Campos, Irene Schimmelpfennig, Jorge Sanjurjo-Sánchez, Laetitia Léanni, José Juan Zamorano, ASTER Team

{"title":"Rapid deglaciation of the La Vega gorge (Sierra de Gredos, Iberian Peninsula) at the end of the global Last Glacial Maximum","authors":"Jesús Alcalá-Reygosa, Néstor Campos, Irene Schimmelpfennig, Jorge Sanjurjo-Sánchez, Laetitia Léanni, José Juan Zamorano, ASTER Team","doi":"10.1002/jqs.3584","DOIUrl":"10.1002/jqs.3584","url":null,"abstract":"Previous studies from the Iberian Central System and other mountains of the Iberian Peninsula and Europe suggest that deglaciation in this area occurred at the end or immediately after the global Last Glacial Maximum (LGM, 26.5–19 ka). In this research, we investigate the timing and speed of deglaciation of the palaeoglacier in La Vega gorge (Iberian Central system) since the global LGM, dating the outer moraines, glacially polished bedrock and glaciofluvial deposits by means of in situ cosmogenic 10Be and optically stimulated luminescence. The results show that one intermediate arc located at the outer frontal moraine system has an age of ~21 ka, being consistent with the global LGM. Deglaciation began at ~21–19 ka, speeding up at ~19 ka. We estimate that around 4–5 km of the palaeoglacier receded in ~1–2 kyrs since ~19 ka, leaving La Vega gorge probably ice-free at ~18 ka. Therefore, our data confirm that deglaciation in Sierra de Gredos began at the end of the global LGM, characterised by a rapid and massive retreat of glaciers.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 2","pages":"277-288"},"PeriodicalIF":2.3,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3584","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138825302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0