globalchange  > 气候变化事实与影响
DOI: 10.1016/j.palaeo.2019.01.001
WOS记录号: WOS:000459841500006
论文题名:
Speleothem U/Th age constraints for the Last Glacial conditions in the Apuan Alps, northwestern Italy
作者: Isola, I.1; Ribolini, A.2; Zanchetta, G.1,2; Bini, M.1,2; Regattieri, E.2,3; Drysdale, R. N.4,5; Hellstrom, J. C.6; Bajo, P.6; Montagna, P.7; Pons-Branchu, E.8
通讯作者: Isola, I.
刊名: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN: 0031-0182
EISSN: 1872-616X
出版年: 2019
卷: 518, 页码:62-71
语种: 英语
英文关键词: Glacier ; Pleniglacial ; MIS2 ; MIS3 ; MIS4 ; Italy
WOS关键词: RAPID CLIMATIC CHANGES ; STALAGMITE EVIDENCE ; NORTHERN APENNINES ; DANSGAARD-OESCHGER ; HIGH-RESOLUTION ; PLEISTOCENE GLACIATIONS ; GALICICA MOUNTAINS ; COLUMBIA ICEFIELDS ; GROWTH MECHANISMS ; CASTLEGUARD CAVE
WOS学科分类: Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向: Physical Geography ; Geology ; Paleontology
英文摘要:

During the Quaternary several glaciations occurred in the mountain regions around the Mediterranean and, inrecent 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 similar to 75 ka, this period was followed by intermittent growth with lower deposition rate and presence of hiatuses until similar to 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.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/132063
Appears in Collections:气候变化事实与影响

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作者单位: 1.Ist Nazl Geofis & Vulcanol, Via Faggiola 32, I-56126 Pisa, Italy
2.Univ Pisa, Dipartimento Sci Terra, Pisa, Italy
3.CNR, Ist Geosci & Georisorse, Pisa, Italy
4.Univ Melbourne, Sch Geog, Melbourne, Vic 3010, Australia
5.Univ Savoie Mt Blanc, Environm Dynam & Terr Montagne, UMR CNRS, Chambery, France
6.Univ Melbourne, Sch Earth Sci, Melbourne, Vic 3010, Australia
7.Ist Sci Marine ISMAR CNR, Bologna, Italy
8.Univ Paris Saclay, Lab Sci Climat & Environm, LSCE IPSL, CEA CNRS UVSQ, Gif Sur Yvette, France

Recommended Citation:
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]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2019-01-01,518:62-71
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