Subsidence, crustal structure, and thermal evolution of Georges Bank basin
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Abstract
A geophysical study of Georges Bank basin defines a deep crustal structure that is interpreted in terms of the basin's tectonic and thermal history. Gravity models along three basin cross sections delineate two zones of crustal thinning at the basement hinge zone and oceanic crustal margins. These two zones bound rift-stage crust (about 25 km thick) which underlies the central portion of the basin. Subsidence analysis of the basin, using data from multichannel seismic reflection lines and two COST wells, suggests a rifting and (uniform) extensional origin. Two-dimensional finite difference modeling of the basin defines a crustal structure that concurs with the gravity and subsidence studies. The resulting isotherms show no major changes in the thermal structure since the ate Jurassic. In some areas of the basin, temperatures sufficient for oil generation are determined from maturation studies of Jurassic sediments. Hydrocarbon generation is questionable, however, because of the probable lack of proper and sufficient kerogen in the Jurassic deposits.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Subsidence, crustal structure, and thermal evolution of Georges Bank basin |
| Series title | American Association of Petroleum Geologists Bulletin |
| DOI | 10.1306/94887893-1704-11D7-8645000102C1865D |
| Volume | 71 |
| Issue | 6 |
| Year Published | 1987 |
| Language | English |
| Publisher | American Association of Petroleum Geologists |
| Contributing office(s) | Woods Hole Coastal and Marine Science Center |
| Description | 17 p. |
| First page | 702 |
| Last page | 718 |
| Other Geospatial | Georges Bank |
| Google Analytic Metrics | Metrics page |