In:
Annals of the New York Academy of Sciences, Wiley, Vol. 912, No. 1 ( 2000-01), p. 200-210
Kurzfassung:
A bstract : During the last two decades, the detection and quantitative determination of gas hydrate deposits, as well as the study of clathrate formation and dissociation kinetics, have become central fields of marine research. The presence of gas hydrates in oceanic sediments along the Norwegian continental margin is documented in high‐frequency near‐vertical and wide‐angle seismic reflection data. The base of the hydrate stability zone (HSZ) is detected in reflection seismic sections by the occurence of a strong bottom simulating reflector (BSR). The BSR mimics the shape of the sea floor, crosses the sedimentary strata, and is characterized by a strong phase‐reversed event. Below the BSR a low velocity layer is interpreted as a gas‐bearing zone. The inferred thickness of the hydrate existence zone (HEZ) allows for the estimation of the total amount of carbon trapped in gas hydrates at the present time. Modeling the HSZ as a function of temperature and pressure shows a distinct decrease of the HSZ at the Norwegian margin from the last glacial maximum (LGM) to the present time. This highly dynamic HSZ system may provide a complex seismic expression of gas hydrate occurrences, a phenomenon that is far from being well understood.
Materialart:
Online-Ressource
ISSN:
0077-8923
,
1749-6632
DOI:
10.1111/nyas.2000.912.issue-1
DOI:
10.1111/j.1749-6632.2000.tb06774.x
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2000
ZDB Id:
2834079-6
ZDB Id:
211003-9
ZDB Id:
2071584-5
SSG:
11
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