Recent mass transport deposits in the Gulf of Cagliari

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology Pub Date : 2025-02-19 DOI:10.1016/j.margeo.2025.107515

Maria Cristina Caradonna , Anna Del Ben , Gian Andrea Pini , Riccardo Geletti , Veronica Frisicchio

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引用次数: 0

Abstract

Sedimentary deposits due to slope failures and submarine landslides are common on continental margins. The availability of five new high resolution 2D multi-channel seismic profiles, integrated by Multibeam data, provides unprecedented insight into the shallow submarine geomorphology of the Gulf of Cagliari. The study area, located in the southern Sardinia offshore, exhibits several Mass Transport Deposits (MTDs) during the Upper Quaternary. They move from the continental slope and the north-east flank of the Banghittu High.

We identified the recent 26 km long MTD-CG1, of which we interpreted the translational domain, characterized by weak deformation, and the toe domain, with a predominantly compressional and erosional regime. This erosion is produced locally by the basal shear zone (bsz) which represents the detachment surface of the slide. Both MTD domains are crossed by vertical conduits and fluid migration that produce buried pockmarks. In the translational domain an underlying carbonate buildup offered greater strength to sliding, resulting in an undisturbed sector. The MTD-CG1 is composed of Middle-Upper Pleistocene sediments which, during the Holocene, assumed an initial direction towards SE, to become towards the SW in the Carbonara Valley. After the gliding, the MTD was cut by the last incision phase of the canyon system which markedly characterizes the physiography of the gulf.

The MTD-CG1 is primarily predisposed to instability by its steep slope gradient and fluid presence, while possible triggers include eustatic sea level changes and seismic activity.

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来源期刊

Marine Geology 地学-地球科学综合

CiteScore

6.10

自引率

6.90%

发文量

175

审稿时长

21.9 weeks

期刊介绍： Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.