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Origin and distribution of shallow gas-charged sediment on the inner continental shelf of central west coast of India.
- Source :
-
Current Science (00113891) . 4/25/2019, Vol. 116 Issue 8, p1410-1417. 8p. - Publication Year :
- 2019
-
Abstract
- High-resolution shallow seismic investigations on inner continental shelf of Goa have been carried out to map gas-charged sediment zones and investigate origin of trapped gas. Analyses of data reveal that the gas is trapped by different stratigraphic layers and is distributed in two zones. Zone-1 is restricted up to ~30 m water depth and in the southern part of the study area. In this zone, gas is confined within the Holocene layers above the Holocene maximum Hooding surface (MFS). Whereas, zone-2 is comprised of several isolated gas-charged patches which are distributed in the entire study area mostly between ~20 m and ~45 m water depth. In this zone, gas is confined below Holocene- MFS in incised river bed or a layer just below MFS or both. Gas-charged sediment in zone-1 is formed due to degradation of organic material which is predominantly early Holocene mangrove derived, whereas, zone-2 it is formed due to degradation of organic material which were deposited by ancestral rivers during the post-glacial sea level rise of the Late Pleistocene. The distribution pattern of zone-1 is controlled by coastline configuration, long-term longshore current pattern, Holocene rapid sea level rise and lithological character of exposed inter-tidal zone. Whereas, distribution of zone-2 is controlled by palaeo-rivers of different glacial periods and their hydraulic energy condition during the base level rise. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00113891
- Volume :
- 116
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Current Science (00113891)
- Publication Type :
- Academic Journal
- Accession number :
- 136163064
- Full Text :
- https://doi.org/10.18520/cs/v116/i8/1410-1417