Arid
DOI10.1016/j.palaeo.2004.01.020
Arid climate 2.5 Ma in the Plio-Pleistocene Valdarno Basin (Northern Apennines, Italy)
Ghinassi, M; Magi, M; Sagri, M; Singer, BS
通讯作者Ghinassi, M
来源期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
EISSN1872-616X
出版年2004
卷号207期号:1-2页码:37-57
英文摘要

Distinctive, eolian-dominated sandy deposits 35 m thick exposed along the SW margin of the Plio-Pleistocene Valdarno Basin in the Not-them Apennines, Italy, reflect an unusually arid period in the region. Paleomagnetic investigation and Ar-40/Ar-39 dating of a tephra layer, 10 in above the eolian sand, suggest that the sand was deposited between about 2.7 and 2.4 Ma. This age is coeval with the global climatic deterioration that occurred at the Middle-Upper Pliocene transition. Eolian sediments are represented by cross-bedded sand, rippled sand and horizontal-bedded sand. The alluvial deposits, associated with the eolian sediment, consist of sheet-like beds of coarse sand and erosively based, pebbly sand bodies. Eolian sand, together with fluvial sandy deposits, was formed in the medial-distal portion of an alluvial system, and represents the Rena Bianca Sand Unit. The eolian and alluvial deposits are arranged into sedimentary cycles (2-6 m thick), displaying a wetting-drying-wetting upward trend recording second-order climatic oscillations of ca. 40 ka. Each cycle is enclosed between major bounding surfaces, defined by iron mineral encrustations. These bounding surfaces represent periods of reduced eolian sand accumulation caused by a rising water table. During the 2.5 Ma global cooling, the Valdarno Basin experienced a period of and conditions owing to the influence of cold and dry easterly and northeasterly winds. In contrast, during the Pleistocene, the uplift of the Pratomagno Ridge protected the Valdarno Basin from easterly and northeasterly winds, giving rise to relatively warm and wet conditions, and mitigating the regional and global climatic changes. (C) 2004 Elsevier B.V All rights reserved.


英文关键词Northern Apennines Palcoclimate eolian deposits bounding surfaces sedimentary cycles argon dating
类型Article
语种英语
国家Italy ; USA
收录类别SCI-E
WOS记录号WOS:000221484700003
WOS关键词AEOLIAN SAND SHEETS ; SEQUENCE STRATIGRAPHY ; MEDITERRANEAN SEA ; BOUNDING SURFACES ; ETJO FORMATION ; PLIOCENE ; PRESERVATION ; SEDIMENTS ; DUNE ; SANDSTONE
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向Physical Geography ; Geology ; Paleontology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/147793
作者单位(1)Univ Siena, Dipartimento Sci Terra, I-53100 Siena, Italy;(2)Univ Florence, Dipartimento Sci Terra, I-50121 Florence, Italy;(3)Univ Wisconsin, Dept Geol & Geophys, Madison, WI 53705 USA
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GB/T 7714
Ghinassi, M,Magi, M,Sagri, M,et al. Arid climate 2.5 Ma in the Plio-Pleistocene Valdarno Basin (Northern Apennines, Italy)[J],2004,207(1-2):37-57.
APA Ghinassi, M,Magi, M,Sagri, M,&Singer, BS.(2004).Arid climate 2.5 Ma in the Plio-Pleistocene Valdarno Basin (Northern Apennines, Italy).PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,207(1-2),37-57.
MLA Ghinassi, M,et al."Arid climate 2.5 Ma in the Plio-Pleistocene Valdarno Basin (Northern Apennines, Italy)".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 207.1-2(2004):37-57.
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