Journal of Quaternary Science最新文献_第3页

Advancing chronologies for Last Interglacial sequences 末次冰期序列的年代学进展

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-07-31 DOI: 10.1002/jqs.3641

AMY M. MCGUIRE, IRENE M. WAAJEN, NATASHA L.M. BARLOW

{"title":"Advancing chronologies for Last Interglacial sequences","authors":"AMY M. MCGUIRE, IRENE M. WAAJEN, NATASHA L.M. BARLOW","doi":"10.1002/jqs.3641","DOIUrl":"10.1002/jqs.3641","url":null,"abstract":"Studies of the Last Interglacial (ca. 129 to 116 ka BP) provide an opportunity to study the impact of high-latitude warm temperatures on the Earth system. To build an accurate spatio-temporal picture of climate and environmental variability during the Last Interglacial, building robust chronologies, through which the patchwork of terrestrial, marine, and ice core archives can be correlated, is paramount. In this review, we briefly evaluate the most common approaches used to date climate and environmental archives from the Last Interglacial, as well as the chronostratigraphic tools available for direct correlation between sequences, with a focus on terrestrial archives. We then present a case study on the use of pollen biostratigraphy for correlating sequences in NW Europe, highlighting its strength as a local correlation tool, and the challenges this approach presents in comparing sequences to global records of climate and environmental change. A move towards consistently dated sequences will improve our understanding of environmental responses to Last Interglacial climate variability across different elements of the global climate system and the rates at which different elements of the climate system respond to changes in global temperatures.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 7","pages":"987-1010"},"PeriodicalIF":1.9,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3641","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866855","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

Hydrological and vegetation changes in North Africa over the past 23 000 years: a comparative study of watershed areas of the Nile River using remote sensing and compound-specific δ2H and δ13C from the Eastern Mediterranean Sea 过去 2.3 万年间北非的水文和植被变化：利用遥感技术和来自东地中海的特定化合物 δ2H 和 δ13C 对尼罗河流域进行的比较研究

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-07-25 DOI: 10.1002/jqs.3649

KHALED S. Sinoussy, Hiroshi Naraoka, Osamu Seki, MAHMOUD A. Hassaan, Yusuke Okazaki

{"title":"Hydrological and vegetation changes in North Africa over the past 23 000 years: a comparative study of watershed areas of the Nile River using remote sensing and compound-specific δ2H and δ13C from the Eastern Mediterranean Sea","authors":"KHALED S. Sinoussy, Hiroshi Naraoka, Osamu Seki, MAHMOUD A. Hassaan, Yusuke Okazaki","doi":"10.1002/jqs.3649","DOIUrl":"10.1002/jqs.3649","url":null,"abstract":"<div>\u0000 \u0000 Hydroclimate variation and vegetation changes of the Nile River watershed area in northeast Africa since the Last Glacial Maximum (LGM) were reconstructed based on n-alkanes, their carbon isotope ratios (δ13Cn-alkanes), and their hydrogen isotope ratios (δ2Hn-alkanes) in sediments from ODP Site 967 in the Eastern Mediterranean Sea. The results were compared with the present vegetation cover in the watershed areas using ArcGIS. The average proportion of current grassland in the Equatorial Lake and Ethiopian Highland Plateaus watershed areas was 45.8 and 64.7%, respectively. δ2Hn-alkanes ranged from −199 to −127‰ and co-varied with insolation change response to orbital forcing. Depleted δ2Hn-alkanes were found from deglaciation to the middle Holocene, suggesting increased precipitation during the African Humid Period (AHP) from 15 to 5 ka caused by northward migration of the Intertropical Convergence Zone. However, lower precipitation was inferred by enriched δ2Hn-alkanes during the LGM and late Holocene. δ13Cn-alkanes at Site 967 did not show a trend in harmony with δ2Hn-alkanes and instead exhibited millennial-scale variations ranging from –25.9 to –33.2‰. These δ13Cn-alkanes values consistently indicated a C4 grass-dominated environment in the watershed areas of the River Nile since the LGM, persisting through the AHP and into the present. Reconstructions demonstrated orbital and abrupt forcing of hydroclimate variability while maintaining generally grass-dominated vegetation with weak precipitation feedback over the late Quaternary.\u0000 </div>","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 7","pages":"1064-1077"},"PeriodicalIF":1.9,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141771732","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

Marine and terrestrial environmental change during the MIS 5–4 transition (southern North Sea area) MIS 5-4 过渡期间的海洋和陆地环境变化（北海南部地区）

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-07-19 DOI: 10.1002/jqs.3647

Irene M. Waajen, Francien Peterse, Frank P. Wesselingh, Freek S. Busschers, Friederike Wagner-Cremer, Sytze van Heteren, Timme H. Donders

{"title":"Marine and terrestrial environmental change during the MIS 5–4 transition (southern North Sea area)","authors":"Irene M. Waajen, Francien Peterse, Frank P. Wesselingh, Freek S. Busschers, Friederike Wagner-Cremer, Sytze van Heteren, Timme H. Donders","doi":"10.1002/jqs.3647","DOIUrl":"10.1002/jqs.3647","url":null,"abstract":"The Late Pleistocene Marine Isotope Stage (MIS) 5 – MIS 4 transition (at ca. 75 ka) is globally known to correspond to a period of strong cooling and sea-level lowering. Terrestrial records indicate the transition had a large impact on terrestrial environments, but the impact on coastal and shallow-marine areas is poorly documented due to a lack of well-dated, continuous archives caused by erosion during succeeding glacial lowstands. The extensive offshore deposits of the Brown Bank Formation in the southern North Sea yield a valuable record of this transition in a shallow-marine environment. We show that the southern North Sea experienced subarctic marine conditions with a high input of terrestrial material during the MIS 5–4 transition. These continued marine conditions, which have not been described earlier for northwestern Europe, show that sea level remained relatively high, and lagged cooling on land inferred from lipid-biomarker palaeothermometry. The time-lag between terrestrial cooling and sea-level fall created a sediment preservation window during the onset of MIS 4 in a shallow-marine environment. Our record captures changes in both the terrestrial and shallow-marine environments, and allows for linking terrestrial and marine records of the MIS 5–4 transition in NW Europe.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 6","pages":"890-904"},"PeriodicalIF":1.9,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3647","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740919","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

Not only domestic spaces: dismantling short-term occupations in Level 497D of Cova Gran de Santa Linya (Pre-Pyrenees, Spain) 不仅是家庭空间：拆除 Cova Gran de Santa Linya（西班牙前比利牛斯山）497D 层的短期占用物

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-07-18 DOI: 10.1002/jqs.3648

Laura Sánchez-Romero, Jorge Martínez-Moreno, Alfonso Benito-Calvo, Javier Sánchez-Martínez, Rafael Mora Torcal

{"title":"Not only domestic spaces: dismantling short-term occupations in Level 497D of Cova Gran de Santa Linya (Pre-Pyrenees, Spain)","authors":"Laura Sánchez-Romero, Jorge Martínez-Moreno, Alfonso Benito-Calvo, Javier Sánchez-Martínez, Rafael Mora Torcal","doi":"10.1002/jqs.3648","DOIUrl":"10.1002/jqs.3648","url":null,"abstract":"The Early Upper Paleolithic Level 497D of Cova Gran (Pre-Pyrenees, Spain) comprises large assemblages of lithics, fauna, hearths, ash accumulations and well-preserved refitting sequences. This provides exceptional information to analyze spatial patterns and deepen our understanding of the socio-economic behavior of these human groups. This large interdisciplinary dataset has allowed us to carry out a detailed spatial study based on density analysis, geostatistics, fabric analysis and orientation techniques, revealing a structuring of the activities performed within the rock shelter. The distribution and accumulation of lithic artifacts, fauna and refits, and their association with the 10 hearths and ash accumulations, show that different types of activities were developed at the site, as well as showing the different uses of the hearths. 497D is a palimpsest where several short-term occupations and/or activities could have occurred in a relatively short period of time, avoiding prolonged exposure to biotic and abiotic post-depositional factors that could have significantly disturbed this well-preserved assemblage. This level shows a place visited several times in relation to the development of specific activities, with movements throughout the landscape for the exploitation of local and regional resources, and less so its use as a domestic space. This implies that the central settlement, or dwelling space, would have been located somewhere other than Cova Gran.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 7","pages":"1078-1097"},"PeriodicalIF":1.9,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3648","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740920","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

Consilience in practice: social–ecological dynamics of the Lake Volvi region (Greece) during the last two millennia 实践中的韧性：过去两千年沃尔维湖地区（希腊）的社会生态动态

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2024-07-12 DOI: 10.1002/jqs.3645

Lucrezia Masci, Georgios C. Liakopoulos, Raphael Gromig, Elias Kolovos, Katerina Kouli, Matthias Moros, Laura Sadori, Alexander Sarantis, Philip Slavin, Jakub Sypiański, Georgios Vidras, Cristiano Vignola, Bernd Wagner, Adam Izdebski, Alessia Masi

{"title":"Consilience in practice: social–ecological dynamics of the Lake Volvi region (Greece) during the last two millennia","authors":"Lucrezia Masci, Georgios C. Liakopoulos, Raphael Gromig, Elias Kolovos, Katerina Kouli, Matthias Moros, Laura Sadori, Alexander Sarantis, Philip Slavin, Jakub Sypiański, Georgios Vidras, Cristiano Vignola, Bernd Wagner, Adam Izdebski, Alessia Masi","doi":"10.1002/jqs.3645","DOIUrl":"https://doi.org/10.1002/jqs.3645","url":null,"abstract":"The Lake Volvi area, part of the region of Macedonia (northern Greece), is a biodiversity hotspot, located in the central part of a major communication corridor connecting the western and eastern parts of the Balkans. The sediment succession from Lake Volvi is investigated here to provide a unique high‐resolution pollen and geochemical record for the last 2000 years combining palaeoecological and historical methods, implementing the concept of consilience. The palaeoecological data document the environmental dynamics since the occupation of the area by the Romans. The vegetation changes reveal the development of wetland habitats and the variations of the mixed deciduous oak and thermophilous–mesophilous forests, as well as cereal cultivation, grazing and arboriculture, whose intensity varied over time. Archaeological data are available for the 1st millennium ce, but detailed historical evidence becomes accessible from the 13th century ce onwards through Byzantine and Ottoman documents. Both historical and palaeoecological data indicate that the 16th century was the period of strongest population pressure on the environment of the Volvi region. However, for other periods, it is possible to observe disagreements between the proxies. We demonstrate that these contradictions can be resolved with a more complex understanding of the region's social–ecological dynamics.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"59 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612503","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

Holocene climate evolution and human activity as recorded by the sediment record of lake Diss Mere, England 英格兰迪斯米尔湖沉积物记录的全新世气候演变和人类活动

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-07-11 DOI: 10.1002/jqs.3646

Laura Boyall, Celia Martin-Puertas, Rik Tjallingii, Alice M. Milner, Simon P. E. Blockley

{"title":"Holocene climate evolution and human activity as recorded by the sediment record of lake Diss Mere, England","authors":"Laura Boyall, Celia Martin-Puertas, Rik Tjallingii, Alice M. Milner, Simon P. E. Blockley","doi":"10.1002/jqs.3646","DOIUrl":"10.1002/jqs.3646","url":null,"abstract":"Lake sediments are ideal archives to evaluate the interactions between climatically driven environmental responses and human activity on seasonal to multi-decadal timescales. This study focuses on the unique sediments of Diss Mere, the only lake in England providing an annually laminated (varved) record for most of the Holocene. We combine microfacies analysis with X-ray core scanning data to explore the influence of natural and human-led changes on sediment deposition over the past 10 200 years and evaluate the sensitivity of the lake sediments to climate variability through time. Variability of titanium (Ti), calcium (Ca) and silica (Si) explain most of the lithological changes observed in the sediment and we identify three stages with low (10 290–2070 cal a bp), intermediate (2070–1040 cal a \u0000bp) and intensified (1040 cal a \u0000bp – present) human influence. During the first stage, where varved sediments are preserved, Ti is low due to the minimal detrital input into the lake. Ca and Si during this stage reveal high-amplitude variability responding to seasonal changes in sediment deposition. The termination of varved sediment preservation and increases in sedimentation rates coincide with a major rise in Ti after this first stage, marking the intensification of human activity around the lake. Ca is used here as an indicator of temperature-included calcite precipitation, and the long-term variability of the Ca profile resembles Holocene temperature evolution. This continues during periods of intensified human activity, suggesting that the Diss Mere sediments remain sensitive to climate through time.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 6","pages":"972-986"},"PeriodicalIF":1.9,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3646","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612588","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

Diatomite evidence for a small palaeo mountain lake at 3400 m asl, Lesotho, southern Africa 非洲南部莱索托海拔 3400 米处一个小型古高山湖泊的硅藻土证据

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2024-07-08 DOI: 10.1002/jqs.3643

Jennifer M. Fitchett, Anson W. Mackay

{"title":"Diatomite evidence for a small palaeo mountain lake at 3400 m asl, Lesotho, southern Africa","authors":"Jennifer M. Fitchett, Anson W. Mackay","doi":"10.1002/jqs.3643","DOIUrl":"https://doi.org/10.1002/jqs.3643","url":null,"abstract":"The Eastern Lesotho Highlands experience an excess of rainfall sufficient to form the country's primary export, supplying the economic hub of southern Africa, Gauteng South Africa. However, there is currently only one natural lake in the country, Letšeng‐la Letsie, and evidence of palaeolakes in the region is therefore of particular interest. This study presents the analysis of a diatomite outcrop from a depression northwest of Mafadi Summit, at 3400 m asl. The presence of diatomite, dominated by the facultative planktonic species Staurosirella pinnata and Staurosira construens and abundant planktonic Aulacoseira ambigua, is indicative of the continuous presence of a shallow lake between ~4600 and 100 cal a bp. Comparative analysis of rainfall for the Mafadi and Letšeng‐la Letsie regions from CHIRPS gridded rainfall data demonstrates sufficient rainfall for a lake of comparable size, if not larger, as Mafadi receives considerably more rainfall than Letšeng‐la Letsie. Analysis of the SRTM 30‐m Digital Elevation Model and Topographic Position Index calculations demonstrate the feasibility of a shallow surface water feature at Mafadi. The conversion of this palaeolake into the contemporary wetland is hypothesized to be the result of post‐industrial warming, possibly augmented by migration of livestock into the Eastern Lesotho Highlands.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"15 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569328","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

The Currey cycle of Great Salt Lake: an early Younger Dryas lake in the Bonneville basin, Utah, USA 大盐湖的库里周期：美国犹他州邦纳维尔盆地的一个早期幼年干涸期湖泊

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-07-04 DOI: 10.1002/jqs.3644

Charles G. Oviatt, D. Craig Young, Daron Duke

引用次数: 0

Late Pleistocene to Holocene vegetation changes in southeastern Patagonia (49° S): landscape changes related to disturbances 巴塔哥尼亚东南部（南纬 49°）晚更新世到全新世的植被变化：与扰动有关的地貌变化

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-07-02 DOI: 10.1002/jqs.3638

Víctor Merino-Campos, Gonzalo David Sottile, María Eugenia de Porras, Marcela Sandra Tonello

{"title":"Late Pleistocene to Holocene vegetation changes in southeastern Patagonia (49° S): landscape changes related to disturbances","authors":"Víctor Merino-Campos, Gonzalo David Sottile, María Eugenia de Porras, Marcela Sandra Tonello","doi":"10.1002/jqs.3638","DOIUrl":"10.1002/jqs.3638","url":null,"abstract":"<div>\u0000 \u0000 Southeastern Patagonia's (49° S) post-glacial history inferred from high Andean lake sediments provides new insights regarding Late Pleistocene and Holocene vegetation dynamics at the eastern margin of the Southern Patagonian Icefield. The fossil records of pollen, charcoal and geochemical data from tephra layers from Laguna Chiquita and Laguna Gemelas Este were analysed to reveal past landscape dynamics related to vegetation changes, fire and volcanic events from ca. 15 200 cal a \u0000bp to the present. Nothofagus forest expanded over shrubland communities sometime between 15 200 and 4600 cal a \u0000bp, along with at least three disturbance sources related to the volcanic eruptions of Lautaro, Aguilera and Hudson, important local fire episodes, and neoglacial advances. Major charcoal deposition reveals moderate fire activity during the Late Pleistocene related to an open landscape characterised by a grass/shrub steppe. Local glacier advances may have affected the Laguna Gemelas Este sedimentation. Tephra deposition events do not correlate to vegetation changes inferred from the Laguna Gemelas Este and Laguna Chiquita pollen records. Late Holocene eastern Andean forest changes and fire activity at 49° S match other southern palaeoenvironmental records (50–52° S) suggesting that changes in the Southern Westerly Wind latitudinal position and intensity drove major palaeovegetation and fire dynamics before the European settlement. In the last centuries, fire and vegetation changes have been closely related to an increase in local ignition sources and the introduction of alien species.\u0000 </div>","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"39 6","pages":"946-959"},"PeriodicalIF":1.9,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141530326","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

Twenty‐thousand‐year gap between deglaciation and peat formation on sub‐Antarctic Marion Island attributed to climate and sea level change 气候和海平面变化导致亚南极马里恩岛脱冰期和泥炭形成之间的两万年差距

IF 2.3 3区地球科学

Journal of Quaternary Science Pub Date : 2024-06-28 DOI: 10.1002/jqs.3642

Werner Nel, DOMINIC A. Hodgson, DAVID W. Hedding, Alex Whittle, ELIZABETH M. Rudolph

{"title":"Twenty‐thousand‐year gap between deglaciation and peat formation on sub‐Antarctic Marion Island attributed to climate and sea level change","authors":"Werner Nel, DOMINIC A. Hodgson, DAVID W. Hedding, Alex Whittle, ELIZABETH M. Rudolph","doi":"10.1002/jqs.3642","DOIUrl":"https://doi.org/10.1002/jqs.3642","url":null,"abstract":"Radiocarbon dating of basal peats has been a key factor in determining minimum ages for deglaciation on sub‐Antarctic islands. On Marion Island, peat bogs dominate the landscape below 300 m a.s.l., and palynological assessments of peat cores have been used to assess the vegetation history and succession rates as well as the sensitivity of the indigenous flora to climatic change. Initiation of peat on the sub‐Antarctic islands signifies a major landscape change which has previously been linked to the retreat of glaciers. Here we test this hypothesis by comparing previously published and new basal peat ages from Marion Island with cosmogenic isotope dates for deglaciation, and local and regional palaeo‐environmental changes. Results show that, in common with other sub‐Antarctic islands, peat initiation occurred after the Antarctic Cold Reversal (15–13 ka) and through the early Holocene climate optimum. This substantially post‐dates cosmogenic isotope evidence for deglaciation from the basalts which shows that the areas where the peatlands dominate were ice‐free from the start of Marine Isotope Stage (MIS) 2 (~31 ka). This suggests that environmental conditions controlled peat initiation rather than deglaciation. Regional climatic proxies show that during and after MIS 2, extremely low temperatures, extensive sea ice conditions and depressed sea surface temperatures together with lower sea levels at an island scale could have maintained conditions unfavourable for peat initiation at their current locations. On Marion Island, the significant gap of ~20 000 years between the timing of deglaciation and peat formation indicates that the use of peat basal ages as a proxy for the minimum age of deglaciation in the sub‐Antarctic should be used with extreme caution.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"19 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529290","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