Geophysical evidence of a large occurrence of mud volcanoes associated with gas plumbing system in the Ross Sea(Antarctica)  

作　　者：Martina Busetti Riccardo Geletti Dario Civile Chiara Sauli Giuseppe Brancatelli Edy Forlin Daniela Accettella Lorenza Barro Savonuzzi Laura De Santis Aldo Vesnaver Andrea Cova 

机构地区：[1]National Institute of Oceanography and Applied Geophysics–OGS,Borgo Grotta Gigante 42/c,34010 Sgonico,Trieste,Italy

出　　处：《Geoscience Frontiers》2024年第1期304-324,共21页地学前缘（英文版）

摘　　要：Seafloor and buried reliefs occur along continental margin of the Ross Sea(Antarctica).These features are several kilometres wide and tens of metres high,exhibiting cone or flat-top dome shapes.Previous studies have proposed a volcanic or glacial origin for these formations,but these hypotheses do not account for all the available evidence.In this study,we use morpho-bathymetric data,intermediate resolution multichannel seismic and high resolution chirp profiles,as well as magnetic lines to investigate these clusters of mounds.By employing targeted processing techniques to enhance the geophysical characterization of the seafloor and buried reliefs,and to understand the underlying geological features,we propose that the reliefs are mud volcanoes.Some of these formations appear to be associated with a plumbing system,as indicated by acoustic anomalies linked to sediment containing gas.These formations are likely fed by clayey source rocks of Miocene age.Additionally,other reliefs might be the result of mud mobilisation caused by gravity instability and fluid overpressure.

关 键 词：Ross Sea ANTARCTICA Mud volcanoes Gas plumbing system Gas hydrate Bottom Simulating Reflector 

分 类 号：P317[天文地球—固体地球物理学] P59[天文地球—地球物理学]