气候变化领域集成服务门户(CCPortal): Speleothem U/Th age constraints for the Last Glacial conditions in the Apuan Alps; northwestern Italy

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DOI	10.1016/j.palaeo.2019.01.001
	Speleothem U/Th age constraints for the Last Glacial conditions in the Apuan Alps; northwestern Italy
	Isola I.; Ribolini A.; Zanchetta G.; Bini M.; Regattieri E.; Drysdale R.N.; Hellstrom J.C.; Bajo P.; Montagna P.; Pons-Branchu E.
发表日期	2019
ISSN	0031-0182
起始页码	62
结束页码	71
卷号	518
英文摘要	During the Quaternary several glaciations occurred in the mountain regions around the Mediterranean and, in recent years, new ages have better constrained their timing. However, this is not the case for the Apuan Alps, a high-rainfall mountain chain adjacent to the Mediterranean Sea. Here, in spite of the widespread evidence for glaciers, the complete lack of geochronological information hinders our understanding of glaciation history. In this paper, we utilize speleothem ages to better constrain the timing of these glacial features. We re-examine 293 uranium‑thorium ages from 19 speleothems collected in five caves at different elevations. After a period of very low growth between 160 and 132 ka, the analysed speleothems grew almost continuously to ~75 ka, this period was followed by intermittent growth with lower deposition rate and presence of hiatuses until ~12.5/12 ka. This is consistent with an ice coverage persisting over the Apuan Alps, inhibiting or interrupting the growth of speleothems via the limited availability of groundwater and the scarcity/absence of soils. This interval is much greater than the time interval that has previously been attributed to the existence of glaciers on the Apuan Alps, which has been assumed to be restricted to Marine Isotope Stage (MIS) 2. Instead, ice cover probably also appeared in the Apuan Alps during MIS 4. The phase of restarting of growth, which may implies the definitive or substantial glacier melts seem to predate the Holocene. © 2019 Elsevier B.V.
英文关键词	Glacier; Italy; MIS2; MIS3; MIS4; Pleniglacial
语种	英语
scopus关键词	depositional environment; glacier advance; ice cover; Last Glacial; marine isotope stage; mountain environment; paleoenvironment; speleothem; thorium isotope; uranium series dating; Apennines; Apuane Alps; Italy; Mediterranean Sea; Tuscany
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151069
作者单位	Istituto Nazionale di Geofisica e Vulcanologia, Pisa, Italy; Dipartimento di Scienze della Terra, University of Pisa, Italy; Istituto di Geoscienze e Georisorse-CNR, Pisa, Italy; School of Geography, University of MelbourneVictoria 3010, Australia; Environnements, Dynamiques et Territoires de la Montagne, UMR CNRS, Universite´ de Savoie-Mont Blanc, France; School of Earth Sciences, University of MelbourneVictoria 3010, Australia; Istituto di Scienze Marine (ISMAR-CNR), Bologna, Italy; Laboratoire des Sciences du Climat et de l'Environnemen, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France
推荐引用方式 GB/T 7714	Isola I.,Ribolini A.,Zanchetta G.,et al. Speleothem U/Th age constraints for the Last Glacial conditions in the Apuan Alps; northwestern Italy[J],2019,518.
APA	Isola I..,Ribolini A..,Zanchetta G..,Bini M..,Regattieri E..,...&Pons-Branchu E..(2019).Speleothem U/Th age constraints for the Last Glacial conditions in the Apuan Alps; northwestern Italy.Palaeogeography, Palaeoclimatology, Palaeoecology,518.
MLA	Isola I.,et al."Speleothem U/Th age constraints for the Last Glacial conditions in the Apuan Alps; northwestern Italy".Palaeogeography, Palaeoclimatology, Palaeoecology 518(2019).