Late Cretaceous - Cenozoic development of outer continental margin, southwestern Nova Scotia
Journal Article
·
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
OSTI ID:6001442
The growth pattern for the outer continental margin of Nova Scotia during the Late Cretaceous and Cenozoic was studied using seismic stratigraphy and well data. Sediment accumulation was broadly controlled by temporal changes in relative sea level, but significant spatial and temporal changes in accumulation patterns were caused by changes in sediment supply rate, morphology, erosion by abyssal currents, and salt tectonics. A Jurassic-Early Cretaceous carbonate platform remained exposed until the Late Cretaceous and controlled the location and steepness of the paleoslope until the late Miocene. Local erosion of the outer shelf and slope in the late Paleocene-early Eocene produced chalky fans on the upper rise. The relationship between erosion of the shelf in the late Eocene and early Oligocene, and abyssal current erosion of the upper rise in the Oligocene, is unclear. Seaward extensions of Tertiary shelf-edge canyons are poorly defined except for the Eocene fans. In the Miocene, abyssal currents eroded a bench on the upper continental rise. Subsequently, sediments lapped onto and buried the paleoslope. The lower rise above horizon A/sup u/ (Oligocene) is composed of fans and olistostromes shed from halokinetic uplift of the upper rise. Current eroded unconformities are common in the rise sequence, but the only current deposit is a Pliocene interval (< 300 m) restricted to the lowermost rise. Pleistocene turbidity currents eroded the present canyon morphology. 15 figures, 2 tables.
- Research Organization:
- Woods Hole Oceanographic Institution, MA
- OSTI ID:
- 6001442
- 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
Cretaceous-Tertiary paleobathymetry of Labrador and Baffin shelves, and its significance to evolution of Labrador Sea
Cenozoic ice volume and margin erosion
Late paleogene (eocene to oligocene) paleoceanography of the northern North Atlantic. Doctoral thesis
Conference
·
Mon Feb 29 23:00:00 EST 1988
· AAPG Bull.; (United States)
·
OSTI ID:6595564
Cenozoic ice volume and margin erosion
Conference
·
Mon Dec 31 23:00:00 EST 1984
· Geol. Soc. Am., Abstr. Programs; (United States)
·
OSTI ID:6462563
Late paleogene (eocene to oligocene) paleoceanography of the northern North Atlantic. Doctoral thesis
Technical Report
·
Sun Oct 31 23:00:00 EST 1982
·
OSTI ID:6762680