GAS-CHARGED SEDIMENTS IN THE AEGEAN AND IONIAN SEAS, GREECE

被引:55
作者
PAPATHEODOROU, G
HASIOTIS, T
FERENTINOS, G
机构
[1] Laboratory of Marine Geology and Physical Oceanography, Department of Geology, University of Patras, Patras
关键词
D O I
10.1016/0025-3227(93)90167-T
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
During the last fifteen years, marine seismic surveys in the Aegean and Ionian Seas have revealed numerous acoustic anomalies; i.e. acoustic turbid zones, gas pockets, gas plumes, enhanced reflectors, columnar disturbances, wipe outs and meso- to micro-morphological features such as pockmarks, domes, mud volcanoes and elongated depressions. These are attributed to the presence of gas in sediment interstices. The gas-charged sediments are found in Pleistocene and present-day fjord-like environments, Pleistocene and present-day deltaic environments, lakes and open sea environments. The gas found in the Quaternary fjord-like and deltaic depositional environments is assumed to be of biogenic origin. The gas found in the pre-Quaternary open sea environments is associated with faulting and salt doming and may, therefore, be of thermogenic origin. Although the sediment grain size is favourable for the formation of pockmarks, the lack of them is probably due to the high seismicity which characterises these regions.
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页码:171 / 184
页数:14
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