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

Research output: Contribution to journalArticle

14 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 languageEnglish (US)
Pages (from-to)17-1-17-4
JournalGeophysical Research Letters
Volume29
Issue number13
DOIs
StatePublished - Jul 1 2002

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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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