Seismic reflection results from Precambrian crust.

S. B. Smithson, W. R. Pierson, S. L. Wilson, Roy A Johnson

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

Abstract

Results of crustal reflection profiling in the Precambrian can provide decisive information on such features as faulting, extension vs compression and crustal scale deformation in general, vertical vs horizontal movements, intrusions, mafic differentiates, underplating and plate tectonics, even though targets in the Precambrian are complex. Mylonite zones are probably the best crustal reflectors so that a moderately-dipping reflector separating the ancient Archaean gneiss terrain from younger Archaean greenstone belts in Minnesota is probably a thrust fault marking the suture zone between the two terrains. This structure implies the operation of plate tectonics by at least the late Archaean. The 3600 m.y. Minnesota gneiss terrain is underlain by a thick (10 km) sequence of layered deformed rocks, whose presence restricts early Archaean events. A Proterozoic suture in SE Wyoming is marked by a thick mylonite zone and a change in crustal structure that has persisted through time. The Adirondack anorthosite and granulite terrain is underlain by a thick layered sequence in the lower crust. Formation of a late Proterozoic basin filled with 10-12 km of interlayered sedimentary rocks in Texas and Oklahoma may have been accompanied by crustal underplating. (Authors' abstract)-J.M.H.

Original languageEnglish (US)
Title of host publicationThe Deep Proterozoic Crust in the North Atlantic Provinces
EditorsA.C. Tobi, J.L.R. Touret
PublisherD. Reidel
Pages21-37
Number of pages17
StatePublished - 1985
Externally publishedYes

Fingerprint

seismic reflection
Archean
Precambrian
crust
mylonite
underplating
plate tectonics
gneiss
Proterozoic
anorthosite
suture zone
greenstone belt
granulite
thrust fault
crustal structure
lower crust
sedimentary rock
faulting
compression
basin

ASJC Scopus subject areas

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

Cite this

Smithson, S. B., Pierson, W. R., Wilson, S. L., & Johnson, R. A. (1985). Seismic reflection results from Precambrian crust. In A. C. Tobi, & J. L. R. Touret (Eds.), The Deep Proterozoic Crust in the North Atlantic Provinces (pp. 21-37). D. Reidel.

Seismic reflection results from Precambrian crust. / Smithson, S. B.; Pierson, W. R.; Wilson, S. L.; Johnson, Roy A.

The Deep Proterozoic Crust in the North Atlantic Provinces. ed. / A.C. Tobi; J.L.R. Touret. D. Reidel, 1985. p. 21-37.

Research output: Chapter in Book/Report/Conference proceedingChapter

Smithson, SB, Pierson, WR, Wilson, SL & Johnson, RA 1985, Seismic reflection results from Precambrian crust. in AC Tobi & JLR Touret (eds), The Deep Proterozoic Crust in the North Atlantic Provinces. D. Reidel, pp. 21-37.
Smithson SB, Pierson WR, Wilson SL, Johnson RA. Seismic reflection results from Precambrian crust. In Tobi AC, Touret JLR, editors, The Deep Proterozoic Crust in the North Atlantic Provinces. D. Reidel. 1985. p. 21-37
Smithson, S. B. ; Pierson, W. R. ; Wilson, S. L. ; Johnson, Roy A. / Seismic reflection results from Precambrian crust. The Deep Proterozoic Crust in the North Atlantic Provinces. editor / A.C. Tobi ; J.L.R. Touret. D. Reidel, 1985. pp. 21-37
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