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International Conference on Gas Hydrates (ICGH) (6th : 2008)
DEEP SEA BENTHIC FORAMINIFERA AS A PROXY OF METHANE HYDRATES FROM IODP SITE 890B CASCADIA MARGIN Kumar, Amit; Gupta, Anil Kumar
Abstract
Release of methane from large marine reservoirs has been linked to climate change, as a causal mechanism and a consequence of temperature changes, during the Holocene to Late Quaternary. These inferred linkages are based primary on variation in benthic foraminifer’s singnatures. This study examines and illustrates deep sea benthic foraminifera from Holocene to Late Quaternary sample from North Pacific Ocean IODP site 890B,Cascadia Margin. Deep sea benthic foraminifera has been quantatively analyzed in samples>125 μm size fractions. Factor and Cluster analysis of the 29 highest ranked species made it possible to identify six biofacies, characterizing distinct deep sea environmental setting. The environmental interpretation of each biofacies is based on the ecology of recent deep sea benthic foraminifera. The benthic faunal record indicates fluctuating deep se condition in environmental parameter including oxygenation, surface productivity and organic food supply. The benthic assemblage show a major shift at 2 to3 kyrs BP and 6 to10.5 BP marked by major turnover in the relative abundance of species coinciding with in increasing amplitude of interstadial cycles. There are strong possibilities of methane flux in this site. Dissociation of gas hydrates and release of methane to the atmosphere could be a cause of increase in the population abundance of highly reducing environmental species, which we interpreted in our data.
Item Metadata
Title |
DEEP SEA BENTHIC FORAMINIFERA AS A PROXY OF METHANE HYDRATES FROM IODP SITE 890B CASCADIA MARGIN
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Creator | |
Contributor | |
Date Issued |
2008-07
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Description |
Release of methane from large marine reservoirs has been linked to climate change, as a causal
mechanism and a consequence of temperature changes, during the Holocene to Late Quaternary.
These inferred linkages are based primary on variation in benthic foraminifer’s singnatures. This
study examines and illustrates deep sea benthic foraminifera from Holocene to Late Quaternary
sample from North Pacific Ocean IODP site 890B,Cascadia Margin. Deep sea benthic foraminifera
has been quantatively analyzed in samples>125 μm size fractions. Factor and Cluster analysis of the
29 highest ranked species made it possible to identify six biofacies, characterizing distinct deep sea
environmental setting. The environmental interpretation of each biofacies is based on the ecology of
recent deep sea benthic foraminifera. The benthic faunal record indicates fluctuating deep se
condition in environmental parameter including oxygenation, surface productivity and organic food
supply. The benthic assemblage show a major shift at 2 to3 kyrs BP and 6 to10.5 BP marked by
major turnover in the relative abundance of species coinciding with in increasing amplitude of interstadial
cycles. There are strong possibilities of methane flux in this site. Dissociation of gas hydrates
and release of methane to the atmosphere could be a cause of increase in the population abundance of
highly reducing environmental species, which we interpreted in our data.
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Extent |
619284 bytes
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Subject | |
Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2008-07-30
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0041063
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URI | |
Affiliation | |
Citation |
Kumar, Amit; Gupta, Anil Kumar. 2008. DEEP SEA BENTHIC FORAMINIFERA AS A PROXY OF METHANE HYDRATES FROM IODP SITE 890B CASCADIA MARGIN. Proceedings of the 6th International Conference on Gas Hydrates (ICGH 2008), Vancouver, British Columbia, CANADA, July 6-10, 2008.
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Peer Review Status |
Unreviewed
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Copyright Holder |
Kumar, Amit
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International