Tectonic evolution of the Labrador Sea and Baffin Bay

constraints imposed by regional geophysics and drilling results from Leg 105

S. P. Srivastava, M. A. Arthur

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Results of drilling in the Labrador Sea and Baffin Bay during Leg 105 confirm an earlier interpretation, based on geophysical data, that the crust under the Labrador Sea is oceanic in nature. The oceanic crust at Site 647 in the Labrador Sea (Chron C24; 56Ma) confirms the age originally assigned to basement at this site on the basis of the magnetic anomaly identification. The crustal age validates the seafloor-spreading model proposed for the Labrador Sea and Baffin Bay. Rates of crustal subsidence obtained at the Baffin Bay site since Oligocene resemble those obtained from a cooling lithospheric plate. The extrapolation of this rate of subsidence shows that Greenland would have separated from Baffin Island about 63Ma ago. The presence of depth anomalies, high heat-flow values at the Labrador Sea sites, and the differences and similarities in the chemical composition of the Labrador Sea and Davis Strait basalts all suggest the possibility of a hot spot under the Davis Strait region during the Paleocene. -Authors

Original languageEnglish (US)
Pages (from-to)989-1009
Number of pages21
JournalUnknown Journal
StatePublished - Jan 1 1989

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geophysics
tectonic evolution
drilling
strait
subsidence
seafloor spreading
magnetic anomaly
Paleocene
heat flow
oceanic crust
sea
Oligocene
hot spot
basalt
chemical composition
crust
cooling
anomaly

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

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Tectonic evolution of the Labrador Sea and Baffin Bay : constraints imposed by regional geophysics and drilling results from Leg 105. / Srivastava, S. P.; Arthur, M. A.

In: Unknown Journal, 01.01.1989, p. 989-1009.

Research output: Contribution to journalArticle

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T2 - constraints imposed by regional geophysics and drilling results from Leg 105

AU - Srivastava, S. P.

AU - Arthur, M. A.

PY - 1989/1/1

Y1 - 1989/1/1

N2 - Results of drilling in the Labrador Sea and Baffin Bay during Leg 105 confirm an earlier interpretation, based on geophysical data, that the crust under the Labrador Sea is oceanic in nature. The oceanic crust at Site 647 in the Labrador Sea (Chron C24; 56Ma) confirms the age originally assigned to basement at this site on the basis of the magnetic anomaly identification. The crustal age validates the seafloor-spreading model proposed for the Labrador Sea and Baffin Bay. Rates of crustal subsidence obtained at the Baffin Bay site since Oligocene resemble those obtained from a cooling lithospheric plate. The extrapolation of this rate of subsidence shows that Greenland would have separated from Baffin Island about 63Ma ago. The presence of depth anomalies, high heat-flow values at the Labrador Sea sites, and the differences and similarities in the chemical composition of the Labrador Sea and Davis Strait basalts all suggest the possibility of a hot spot under the Davis Strait region during the Paleocene. -Authors

AB - Results of drilling in the Labrador Sea and Baffin Bay during Leg 105 confirm an earlier interpretation, based on geophysical data, that the crust under the Labrador Sea is oceanic in nature. The oceanic crust at Site 647 in the Labrador Sea (Chron C24; 56Ma) confirms the age originally assigned to basement at this site on the basis of the magnetic anomaly identification. The crustal age validates the seafloor-spreading model proposed for the Labrador Sea and Baffin Bay. Rates of crustal subsidence obtained at the Baffin Bay site since Oligocene resemble those obtained from a cooling lithospheric plate. The extrapolation of this rate of subsidence shows that Greenland would have separated from Baffin Island about 63Ma ago. The presence of depth anomalies, high heat-flow values at the Labrador Sea sites, and the differences and similarities in the chemical composition of the Labrador Sea and Davis Strait basalts all suggest the possibility of a hot spot under the Davis Strait region during the Paleocene. -Authors

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