The transition from a volcanic to a nonvolcanic rifted margin off eastern Canada
Article Abstract:
Geophysical observations over the East Coast Magnetic Anomaly (ECMA) along the U.S. margin to the south are used to determine whether the same seismic character delineates the ECMA in all regions. The seismic data reveals that seaward dipping reflections (SDR) continue northward into the area off the shore of Nova Scotia and confirm the correlation between the presence of a well-developed ECMA and the SDR unit. Slightly north of the study area, the ECMA weakens and is no longer well developed. The SDR unit also ends and is no longer evident over most of the Nova Scotian margin.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
Extensional styles and gravity anomalies at rifted continental margins: some North Atlantic examples
Article Abstract:
A model of crustal necking and regional isostatic compensation was developed to investigate a wide variety of crustal profiles and related gravity anomalies across rifted margins around the North Atlantic. The results of the seismic reflection data suggested that the depth of necking (DON) corresponds to the strength of the lithosphere during rifting. On the other hand, the correlation between DON and the geological history of the margin segments indicated a very weak relationship between DON and prerift age.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1997
User Contributions:
Comment about this article or add new information about this topic:
Formation and evolution of the Nova Scotia rifted margin: evidence from deep seismic reflection data
Article Abstract:
Seismic reflection data analysed in relation to gravity and subsidence data suggest that there is a very deep sedimentary basin beneath the Nova Scotia margin and very thick sediment below the continental slope and rise up to 15 km. The crustal thinning across this margin segment points to a 100 to 200 km wide zone of thinned continental crust. There is a 100 km wide zone of very thin crust below the continental slope and rise, below synrift sediments and at seaward limit lies the continental-ocean boundary.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Cenozoic transtension along the Transantarctic Mountains-west Antarctic rift boundary, southern Victoria Land, Antarctica
- Abstracts: The tectonostratigraphy and structure of the eastern Nepal Himalaya. Thrust tectonics of the Binalood Region, NE Iran
- Abstracts: Tephroite-hausmannite-galaxite from a granulite-facies manganese rocks of the United Arab Emirates. K-Ar ages of the metamorphic sole of the Semail Ophiolite: implications for ophiolite cooling history
- Abstracts: An enriched mantle source for potassic basanites: evidence from Karisimbi volcano, Virunga volcanic province, Rwanda
- Abstracts: Discussion on vitrinite reflectivity and the structure and burial history of the Old Red Sandstone of the Midland Valley