Universität zu Köln

Chelli, Alessandro ORCID: 0000-0001-5035-733X, Pappalardo, Marta, Bini, Monica ORCID: 0000-0003-1482-2630, Brueckner, Helmut, Neri, Giorgio, Neri, Michele and Spada, Giorgio (2017). Assessing tectonic subsidence from estimates of Holocene relative sea-level change: An example from the NW Mediterranean (Magra Plain, Italy). Holocene, 27 (12). S. 1988 - 2000. LONDON: SAGE PUBLICATIONS LTD. ISSN 1477-0911

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Abstract

New sedimentological sea-level indicators are presented from the River Magra coastal plain, in NW Italy. Chronologically well-constrained paralic peats and organic sediments which had been deposited in a defined relationship with sea level were recovered in four of the seven boreholes considered in this work. Their evolution scatters in the time span of the past 6000 years. Since the cores are located within a single sedimentary basin, it was possible to correct the elevation of marker horizons for the effect of sediment compaction by means of both a field and a geotechnical method. Thus, seven reliable index points for the mid- to late-Holocene sea-level rise were obtained. The age-depth model derived from them was compared with that of sea-level predictions from two different Glacial Isostatic Adjustment (GIA) models available for the area. In both cases, the modelled sea-level estimates overlie the index points, suggesting lower relative sea-level elevation than the one predicted considering the combined eustatic and hydro-isostatic components. Based on the general tectonic setting of the area, this finding was interpreted as the effect of a tectonic subsidence of the basin, the rate of which can be quantified on average as 0.5 mm/yr since the middle Holocene, with a sharp increase after 2500 yr BP. By providing a reliable estimate of the rate of tectonic subsidence in a coastal area of NW Italy, this research contributes to refining the geodynamic model of this part of the Mediterranean basin.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Chelli, Alessandro UNSPECIFIED orcid.org/0000-0001-5035-733X UNSPECIFIED Pappalardo, Marta UNSPECIFIED UNSPECIFIED UNSPECIFIED Bini, Monica UNSPECIFIED orcid.org/0000-0003-1482-2630 UNSPECIFIED Brueckner, Helmut UNSPECIFIED UNSPECIFIED UNSPECIFIED Neri, Giorgio UNSPECIFIED UNSPECIFIED UNSPECIFIED Neri, Michele UNSPECIFIED UNSPECIFIED UNSPECIFIED Spada, Giorgio UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-210128
DOI:	10.1177/0959683617715688
Journal or Publication Title:	Holocene
Volume:	27
Number:	12
Page Range:	S. 1988 - 2000
Date:	2017
Publisher:	SAGE PUBLICATIONS LTD
Place of Publication:	LONDON
ISSN:	1477-0911
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LAST 6000 YEARS; COASTAL-PLAIN; SEDIMENT COMPACTION; VERTICAL MOVEMENTS; MISSISSIPPI DELTA; VERSILIAN PLAIN; PEAT COMPACTION; RHONE DELTA; GPS DATA; EVOLUTION Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21012