DOI: 10.1016/j.palaeo.2013.09.022
论文题名: A major change in the sedimentation regime in the Crotone Basin (Southern Italy) around 3.7-3.6Ma
作者: Consolaro C. ; Macrì P. ; Massari F. ; Speranza F. ; Fornaciari E.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 392 起始页码: 398
结束页码: 410
语种: 英语
英文关键词: Biostratigraphy
; Calabrian Arc
; Diatomites
; Magnetostratigraphy
; Mediterranean
; Pliocene
英文摘要: The Lower Pliocene succession of the Crotone Basin (Calabrian Arc, Southern Italy) is mainly comprised of blue-grey marly clay with good magnetic properties. Here the bio-magnetostratigraphic data indicate a mean sedimentation rate of about 12-15. cm/kyr. Around 3.7-3.6. Ma a major change in the sedimentation regime occurred: the blue-grey hemipelagic marls grade rapidly into silty marls with a significant increase in the terrigenous fraction and with abundant siliceous remains throughout the whole interval. Magnetic properties of these sediments are very poor, but an integrated calcareous plankton biostratigraphy (foraminifera and nannofossils) infers a high average sedimentation rate (about 50-60. cm/kyr). The abrupt onset of this sedimentation regime in the Crotone Basin is contemporaneous with a major unconformity already recognized in the northern sector of the basin, part of a major reorganization phase in the whole Apenninic-Maghrebid Chain known as ". Globorotalia puncticulata event". Reports of coeval siliceous sediments in other marginal basins of the Apennines (Southern Calabria, Southern and Northern Apennines) suggest that this "siliceous event" might have been regionally extensive, having important palaeoceanographical implications. We infer that the "siliceous event" is characterized by a combined tectonic- and climate-induced change in palaeoceanographic conditions. The tectonic triggering factors may have been linked to two synchronous events in the Tyrrhenian-Apennine system: 1) the shortening event also known as ". G. puncticulata event", and 2) the coeval opening of the Vavilov Basin in the Tyrrhenian Sea which yielded profound influences in terms of physiography and characteristics of the Crotone Basin. The consequent uplift of the Southern Apennines would have increased sediment supply and availability of silica, resulting in eutrophication and enhanced silica preservation. Strong winter mixing and possibly upwelling conditions could have increased primary productivity during heavy isotope stages Gi4, Gi2 and MG8, at the onset of the "siliceous event". This important event, lasting from ca. 3.6. Ma to ca. 3.2. Ma, would have recorded a peculiar transitional period before further climatic deterioration and more drastic palaeoceanographic changes occurred around 3.1. Ma, leading to cyclic sapropel deposition in the whole of the Mediterranean sea.© 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69554
Appears in Collections: 过去全球变化的重建
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作者单位: Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, 35131 Padova, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Roma, Italy
Recommended Citation:
Consolaro C.,Macrì P.,Massari F.,et al. A major change in the sedimentation regime in the Crotone Basin (Southern Italy) around 3.7-3.6Ma[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,392