Subsidence, crustal structure, and thermal evolution of Georges Bank basin
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 Late 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 probably lack of proper and sufficient kerogen in the Jurassic deposits. 12 figures.
- Research Organization:
- Geological Survey, Woods Hole, MA
- OSTI ID:
- 5783259
- Journal Information:
- AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States), Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Vol. 71:6; ISSN AABUD
- Country of Publication:
- United States
- Language:
- English
Similar Records
Crustal structure and basin architecture, De Soto Canyon Salt basin, northeastern Gulf of Mexico
Tectonic development of Baltimore Canyon Trough