LARAMIDE THRUST-GENERATED ALLUVIAL-FAN SEDIMENTATION, SPHINX CONGLOMERATE, SOUTHWESTERN MONTANA.

Peter G Decelles, R. B. Tolson, S. A. Graham, G. A. Smith, R. V. Ingersoll, J. White, C. J. Schmidt, R. Rice, I. Moxon, L. Lemke, J. W. Handschy, M. F. Follo, D. P. Edwards, W. Cavazza, M. Caldwell

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The Sphinx Conglomerate consists of a thick overall coarsening-upward megasequence that was shed in front of the eastward migrating Madison-Gravelly thrust plate during the Laramide orogeny. Lithofacies and paleocurrent data indicate that it was deposited primarily by east-northeastward flowing, boulder- and cobble-rich streams, augmented by debris flows, on a system of at least two vertically and laterally coalesced alluvial fans. Trends in clast size, lithofacies distributions, and clast compositions indicate that both alluvial fan progradation in response to thrusting and influx of Paleozoic carbonate clasts controlled development.

Original languageEnglish (US)
Pages (from-to)135-155
Number of pages21
JournalAAPG Bulletin
Volume71
Issue number2
StatePublished - Feb 1987
Externally publishedYes

Fingerprint

alluvial fan
Sedimentation
clast
conglomerate
Fans
thrust
sedimentation
lithofacies
Carbonates
Coarsening
Debris
Laramide orogeny
paleocurrent
progradation
boulder
debris flow
Paleozoic
Chemical analysis
carbonate

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

Decelles, P. G., Tolson, R. B., Graham, S. A., Smith, G. A., Ingersoll, R. V., White, J., ... Caldwell, M. (1987). LARAMIDE THRUST-GENERATED ALLUVIAL-FAN SEDIMENTATION, SPHINX CONGLOMERATE, SOUTHWESTERN MONTANA. AAPG Bulletin, 71(2), 135-155.

LARAMIDE THRUST-GENERATED ALLUVIAL-FAN SEDIMENTATION, SPHINX CONGLOMERATE, SOUTHWESTERN MONTANA. / Decelles, Peter G; Tolson, R. B.; Graham, S. A.; Smith, G. A.; Ingersoll, R. V.; White, J.; Schmidt, C. J.; Rice, R.; Moxon, I.; Lemke, L.; Handschy, J. W.; Follo, M. F.; Edwards, D. P.; Cavazza, W.; Caldwell, M.

In: AAPG Bulletin, Vol. 71, No. 2, 02.1987, p. 135-155.

Research output: Contribution to journalArticle

Decelles, PG, Tolson, RB, Graham, SA, Smith, GA, Ingersoll, RV, White, J, Schmidt, CJ, Rice, R, Moxon, I, Lemke, L, Handschy, JW, Follo, MF, Edwards, DP, Cavazza, W & Caldwell, M 1987, 'LARAMIDE THRUST-GENERATED ALLUVIAL-FAN SEDIMENTATION, SPHINX CONGLOMERATE, SOUTHWESTERN MONTANA.', AAPG Bulletin, vol. 71, no. 2, pp. 135-155.
Decelles PG, Tolson RB, Graham SA, Smith GA, Ingersoll RV, White J et al. LARAMIDE THRUST-GENERATED ALLUVIAL-FAN SEDIMENTATION, SPHINX CONGLOMERATE, SOUTHWESTERN MONTANA. AAPG Bulletin. 1987 Feb;71(2):135-155.
Decelles, Peter G ; Tolson, R. B. ; Graham, S. A. ; Smith, G. A. ; Ingersoll, R. V. ; White, J. ; Schmidt, C. J. ; Rice, R. ; Moxon, I. ; Lemke, L. ; Handschy, J. W. ; Follo, M. F. ; Edwards, D. P. ; Cavazza, W. ; Caldwell, M. / LARAMIDE THRUST-GENERATED ALLUVIAL-FAN SEDIMENTATION, SPHINX CONGLOMERATE, SOUTHWESTERN MONTANA. In: AAPG Bulletin. 1987 ; Vol. 71, No. 2. pp. 135-155.
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