DOI: 10.1016/j.quascirev.2014.10.030
Scopus记录号: 2-s2.0-84913557679
论文题名: Sedimentary response to Milankovitch-type climatic oscillations and formation of sediment undulations: Evidence from a shallow-shelf setting at Gela Basin on the Sicilian continental margin
作者: Kuhlmann J. ; Asioli A. ; Trincardi F. ; Klügel A. ; Huhn K.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 108 起始页码: 76
结束页码: 94
语种: 英语
英文关键词: Benthic foraminifera
; Biofacies
; Gela basin
; Late quaternary
; Milankovitch cyclicity
; Oxygen isotope records
; Planktic foraminifera
; Sediment undulations
; Strait of sicily
Scopus关键词: Deposition
; Glacial geology
; Isotopes
; Precipitation (meteorology)
; Sea level
; Sedimentology
; Sediments
; Benthic foraminifera
; Biofacies
; Gela basin
; Late quaternary
; Milankovitch cyclicity
; Oxygen isotope records
; Planktic foraminifera
; Strait of sicily
; Stratigraphy
; accumulation rate
; biofacies
; chronostratigraphy
; continental margin
; cyclicity
; depositional sequence
; Last Glacial-Interglacial
; Milankovitch cycle
; oxygen isotope
; planktonic foraminifera
; progradation
; sea level change
; sequence stratigraphy
; Caltanissetta
; Gela
; Italy
; Sicily
; Foraminifera
英文摘要: A multi-proxy chronological framework along with sequence-stratigraphic interpretations unveils composite Milankovitch cyclicity in the sedimentary records of the Last Glacial-Interglacial cycle at NE Gela Basin on the Sicilian continental margin. Chronostratigraphic data (including foraminifera-based eco-biostratigraphy and δ18O records, tephrochronological markers and 14C AMS radiometric datings) was derived from the shallow-shelf drill sites GeoB14403 (54.6m recovery) and GeoB14414 (27.5m), collected with both gravity and drilled MeBo cores in 193m and 146m water depth, respectively. The recovered intervals record Marine Isotope Stages and Substages (MIS) from MIS 5 to MIS 1, thus comprising major stratigraphic parts of the progradational deposits that form the last 100-ka depositional sequence. Calibration of shelf sedimentary units with borehole stratigraphies indicates the impact of higher-frequency (20-ka) sea level cycles punctuating this 100-ka cycle. This becomes most evident in the alternation of thick interstadial highstand (HST) wedges and thinner glacial forced-regression (FSST) units mirroring seaward shifts in coastal progradation. Albeit their relatively short-lived depositional phase, these subordinate HST units form the bulk of the 100-ka depositional sequence. Two mechanisms are proposed that likely account for enhanced sediment accumulation ratios (SAR) of up to 200cm/ka during these intervals: (1) intensified activity of deep and intermediate Levantine Intermediate Water (LIW) associated to the drowning of Mediterranean shelves, and (2) amplified sediment flux along the flooded shelf in response to hyperpycnal plumes that generate through extreme precipitation events during overall arid conditions. Equally, the latter mechanism is thought to be at the origin of undulated features resolved in the acoustic records of MIS 5 Interstadials, which bear a striking resemblance to modern equivalents forming on late-Holocene prodeltas of other Mediterranean shallow-shelf settings. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60048
Appears in Collections: 过去全球变化的重建
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作者单位: MARUM - Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany; Istituto di Geoscienze e Georisorse, CNR-UOS di Padova, Padova, Italy; Istituto di Scienze Marine, ISMAR-CNR, Venezia, Italy; Department of Geosciences, University of Bremen, Bremen, Germany
Recommended Citation:
Kuhlmann J.,Asioli A.,Trincardi F.,et al. Sedimentary response to Milankovitch-type climatic oscillations and formation of sediment undulations: Evidence from a shallow-shelf setting at Gela Basin on the Sicilian continental margin[J]. Quaternary Science Reviews,2015-01-01,108