Geometry of Proterozoic sutures in the central Rocky Mountains from seismic reflection data: Cheyenne belt and Farwell Mountain structures

Elena Morozova; Xin Wan; Kevin R. Chamberlain; Scott B. Smithson; Igor B. Morozov; Nickolas K. Boyd; Roy A. Johnson; Karl E. Karlstrom; Amanda R. Tyson; C. T. Foster

doi:10.1029/2001GL013819

Geometry of Proterozoic sutures in the central Rocky Mountains from seismic reflection data: Cheyenne belt and Farwell Mountain structures

Elena Morozova, Xin Wan, Kevin R. Chamberlain, Scott B. Smithson, Igor B. Morozov, Nickolas K. Boyd, Roy A. Johnson, Karl E. Karlstrom, Amanda R. Tyson, C. T. Foster

Geosciences

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19 Scopus citations

Abstract

Seismic reflection data show ∼40° S-dipping reflectors that extend from the Cheyenne belt (CB-Archean-Proterozoic suture) to 20 km depths, and profound differences in crustal reflectivity across the suture zone, which is itself imaged as an interwedging boundary. Archean crust has a Moho reflection (at 40 km) and abundant upper crustal reflectivity; Proterozoic crust has no Moho reflection and is distinctly less reflective. Reflective zones south of the Cheyenne belt include 40° S- and N-dipping reflections that extend from the Farwell Mountain zone to 20 km depths; these are interpreted to be a complex cryptic suture zone between the 1.78-1.76 Ga Green Mountain block and 1.75-1.72 Ga Rawah block.

Original language	English (US)
Pages (from-to)	17-1-17-4
Journal	Geophysical Research Letters
Volume	29
Issue number	13
DOIs	https://doi.org/10.1029/2001GL013819
State	Published - Jul 1 2002

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

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10.1029/2001GL013819

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Morozova, E., Wan, X., Chamberlain, K. R., Smithson, S. B., Morozov, I. B., Boyd, N. K., Johnson, R. A., Karlstrom, K. E., Tyson, A. R., & Foster, C. T. (2002). Geometry of Proterozoic sutures in the central Rocky Mountains from seismic reflection data: Cheyenne belt and Farwell Mountain structures. Geophysical Research Letters, 29(13), 17-1-17-4. https://doi.org/10.1029/2001GL013819

Morozova, E, Wan, X, Chamberlain, KR, Smithson, SB, Morozov, IB, Boyd, NK, Johnson, RA, Karlstrom, KE, Tyson, AR & Foster, CT 2002, 'Geometry of Proterozoic sutures in the central Rocky Mountains from seismic reflection data: Cheyenne belt and Farwell Mountain structures', Geophysical Research Letters, vol. 29, no. 13, pp. 17-1-17-4. https://doi.org/10.1029/2001GL013819

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abstract = "Seismic reflection data show ∼40° S-dipping reflectors that extend from the Cheyenne belt (CB-Archean-Proterozoic suture) to 20 km depths, and profound differences in crustal reflectivity across the suture zone, which is itself imaged as an interwedging boundary. Archean crust has a Moho reflection (at 40 km) and abundant upper crustal reflectivity; Proterozoic crust has no Moho reflection and is distinctly less reflective. Reflective zones south of the Cheyenne belt include 40° S- and N-dipping reflections that extend from the Farwell Mountain zone to 20 km depths; these are interpreted to be a complex cryptic suture zone between the 1.78-1.76 Ga Green Mountain block and 1.75-1.72 Ga Rawah block.",

author = "Elena Morozova and Xin Wan and Chamberlain, {Kevin R.} and Smithson, {Scott B.} and Morozov, {Igor B.} and Boyd, {Nickolas K.} and Johnson, {Roy A.} and Karlstrom, {Karl E.} and Tyson, {Amanda R.} and Foster, {C. T.}",

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AU - Morozova, Elena

AU - Wan, Xin

AU - Chamberlain, Kevin R.

AU - Smithson, Scott B.

AU - Morozov, Igor B.

AU - Boyd, Nickolas K.

AU - Johnson, Roy A.

AU - Karlstrom, Karl E.

AU - Tyson, Amanda R.

AU - Foster, C. T.

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AB - Seismic reflection data show ∼40° S-dipping reflectors that extend from the Cheyenne belt (CB-Archean-Proterozoic suture) to 20 km depths, and profound differences in crustal reflectivity across the suture zone, which is itself imaged as an interwedging boundary. Archean crust has a Moho reflection (at 40 km) and abundant upper crustal reflectivity; Proterozoic crust has no Moho reflection and is distinctly less reflective. Reflective zones south of the Cheyenne belt include 40° S- and N-dipping reflections that extend from the Farwell Mountain zone to 20 km depths; these are interpreted to be a complex cryptic suture zone between the 1.78-1.76 Ga Green Mountain block and 1.75-1.72 Ga Rawah block.

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Geometry of Proterozoic sutures in the central Rocky Mountains from seismic reflection data: Cheyenne belt and Farwell Mountain structures

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