Sediment deformation and structures formed by gas migration and seafloor exudation: An experimental approach

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology Pub Date : 2025-02-16 DOI:10.1016/j.margeo.2025.107501

Gabriela L.P. Pimentel , Eduardo Puhl , Daniel Bayer da Silva , Kiane Scheffer de Azevedo , Cristian Valenti Schenk , Felipe Rafael Secco da Silva , Adriano R. Viana , Marcelo Ketzer

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引用次数: 0

Abstract

Gas migration and seafloor exudation are common phenomena in both deep and shallow water settings. However, the formation mechanisms and the relationships between different gas migration-related structures remain only partially understood. We constructed a reduced physical model of a submarine slope with two layers of varying permeabilities, subjected to a punctuated air injection to simulate gas migration and seafloor exudation. The air passage resulted in various structures, including mounds, pockmarks, chimneys, and different types of fractures (tensile, shear, irregular, radial, dendritic, and semicircular). Their processes, evolution, and interconnections were recorded and analyzed using image processing techniques. The results reveal the development of different stages of gas migration leading to seafloor exudation, from the initial fracturing stage to gas release into the water column, emphasizing the crucial role of impermeable layer thickness, the distribution of structures along the slope, and the impact of local topographic features. Our model provides robust insights into sediment deformation and the formation of structures associated with gas migration and exudation on the seafloor.

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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.