A review of the geology and structure of the Cheyenne belt and Proterozoic rocks of southern Wyoming

R. S. Houston, Ernest M Duebendorfer, K. E. Karlstrom, W. R. Premo

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The Colorado Proterozoic province is separated from Archean rocks of the Wyoming province by a major structural boundary, the Cheyenne belt. Proterozoic rocks south of the Cheyenne belt are exposed in the Sierra Madre, Medicine Bow Mountains, and Laramie Range of southern Wyoming. They consist of metavolcanic units, metagraywacke, pelitic schist and gneiss, amphibolite, and felsic to mafic intrusive rocks that locally resemble rocks of central Colorado. North of the Cheyenne belt, Archean granite and gneiss of the Wyoming craton are overlain by a Late Archean and Early Proterozoic supracrustal sequence that contains quartzite, metadolomite, phyllite, and subordinate metavolcanic rocks. The eugeoclinal character of the metamorphic rocks south of the Cheyenne belt contrasts sharply with the dominantly siliciclastic supracrustal rocks north of the Cheyenne belt. Although specific sequences south of the belt have not yet been correlated between the Sierra Madre, Medicine Bow Mountains, and Laramie Range, similarities in age, lithology, and major element chemistry suggest that they are part of a single geologic terrane. Macroscopic structure and microscopic kinematic indicators within the Cheyenne belt suggest that accretion of the Proterozoic rocks of northern Colorado to the Archean Wyoming craton was accomplished primarily by large-scale thrusting. Following accretion of individual thrust blocks, the boundary zone was steepened by folding and reactivated locally during a period of strike-slip movement. Presence of similar lithologies and shear zones south of the Cheyenne belt suggests that the southern margin of the Wyoming craton may have been a long-lived zone of crustal accretion.

Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalSpecial Paper of the Geological Society of America
Volume235
DOIs
StatePublished - 1989
Externally publishedYes

Fingerprint

Proterozoic
geology
rock
Archean
craton
accretion
medicine
gneiss
lithology
phyllite
supracrustal rock
metavolcanic rock
mountain
quartzite
amphibolite
mafic rock
metamorphic rock
schist
folding
shear zone

ASJC Scopus subject areas

  • Geology

Cite this

A review of the geology and structure of the Cheyenne belt and Proterozoic rocks of southern Wyoming. / Houston, R. S.; Duebendorfer, Ernest M; Karlstrom, K. E.; Premo, W. R.

In: Special Paper of the Geological Society of America, Vol. 235, 1989, p. 1-12.

Research output: Contribution to journalArticle

@article{a8f11536d8b1438e95638a485893d6b4,
title = "A review of the geology and structure of the Cheyenne belt and Proterozoic rocks of southern Wyoming",
abstract = "The Colorado Proterozoic province is separated from Archean rocks of the Wyoming province by a major structural boundary, the Cheyenne belt. Proterozoic rocks south of the Cheyenne belt are exposed in the Sierra Madre, Medicine Bow Mountains, and Laramie Range of southern Wyoming. They consist of metavolcanic units, metagraywacke, pelitic schist and gneiss, amphibolite, and felsic to mafic intrusive rocks that locally resemble rocks of central Colorado. North of the Cheyenne belt, Archean granite and gneiss of the Wyoming craton are overlain by a Late Archean and Early Proterozoic supracrustal sequence that contains quartzite, metadolomite, phyllite, and subordinate metavolcanic rocks. The eugeoclinal character of the metamorphic rocks south of the Cheyenne belt contrasts sharply with the dominantly siliciclastic supracrustal rocks north of the Cheyenne belt. Although specific sequences south of the belt have not yet been correlated between the Sierra Madre, Medicine Bow Mountains, and Laramie Range, similarities in age, lithology, and major element chemistry suggest that they are part of a single geologic terrane. Macroscopic structure and microscopic kinematic indicators within the Cheyenne belt suggest that accretion of the Proterozoic rocks of northern Colorado to the Archean Wyoming craton was accomplished primarily by large-scale thrusting. Following accretion of individual thrust blocks, the boundary zone was steepened by folding and reactivated locally during a period of strike-slip movement. Presence of similar lithologies and shear zones south of the Cheyenne belt suggests that the southern margin of the Wyoming craton may have been a long-lived zone of crustal accretion.",
author = "Houston, {R. S.} and Duebendorfer, {Ernest M} and Karlstrom, {K. E.} and Premo, {W. R.}",
year = "1989",
doi = "10.1130/SPE235-p1",
language = "English (US)",
volume = "235",
pages = "1--12",
journal = "Special Paper of the Geological Society of America",
issn = "0072-1077",
publisher = "Geological Society of America",

}

TY - JOUR

T1 - A review of the geology and structure of the Cheyenne belt and Proterozoic rocks of southern Wyoming

AU - Houston, R. S.

AU - Duebendorfer, Ernest M

AU - Karlstrom, K. E.

AU - Premo, W. R.

PY - 1989

Y1 - 1989

N2 - The Colorado Proterozoic province is separated from Archean rocks of the Wyoming province by a major structural boundary, the Cheyenne belt. Proterozoic rocks south of the Cheyenne belt are exposed in the Sierra Madre, Medicine Bow Mountains, and Laramie Range of southern Wyoming. They consist of metavolcanic units, metagraywacke, pelitic schist and gneiss, amphibolite, and felsic to mafic intrusive rocks that locally resemble rocks of central Colorado. North of the Cheyenne belt, Archean granite and gneiss of the Wyoming craton are overlain by a Late Archean and Early Proterozoic supracrustal sequence that contains quartzite, metadolomite, phyllite, and subordinate metavolcanic rocks. The eugeoclinal character of the metamorphic rocks south of the Cheyenne belt contrasts sharply with the dominantly siliciclastic supracrustal rocks north of the Cheyenne belt. Although specific sequences south of the belt have not yet been correlated between the Sierra Madre, Medicine Bow Mountains, and Laramie Range, similarities in age, lithology, and major element chemistry suggest that they are part of a single geologic terrane. Macroscopic structure and microscopic kinematic indicators within the Cheyenne belt suggest that accretion of the Proterozoic rocks of northern Colorado to the Archean Wyoming craton was accomplished primarily by large-scale thrusting. Following accretion of individual thrust blocks, the boundary zone was steepened by folding and reactivated locally during a period of strike-slip movement. Presence of similar lithologies and shear zones south of the Cheyenne belt suggests that the southern margin of the Wyoming craton may have been a long-lived zone of crustal accretion.

AB - The Colorado Proterozoic province is separated from Archean rocks of the Wyoming province by a major structural boundary, the Cheyenne belt. Proterozoic rocks south of the Cheyenne belt are exposed in the Sierra Madre, Medicine Bow Mountains, and Laramie Range of southern Wyoming. They consist of metavolcanic units, metagraywacke, pelitic schist and gneiss, amphibolite, and felsic to mafic intrusive rocks that locally resemble rocks of central Colorado. North of the Cheyenne belt, Archean granite and gneiss of the Wyoming craton are overlain by a Late Archean and Early Proterozoic supracrustal sequence that contains quartzite, metadolomite, phyllite, and subordinate metavolcanic rocks. The eugeoclinal character of the metamorphic rocks south of the Cheyenne belt contrasts sharply with the dominantly siliciclastic supracrustal rocks north of the Cheyenne belt. Although specific sequences south of the belt have not yet been correlated between the Sierra Madre, Medicine Bow Mountains, and Laramie Range, similarities in age, lithology, and major element chemistry suggest that they are part of a single geologic terrane. Macroscopic structure and microscopic kinematic indicators within the Cheyenne belt suggest that accretion of the Proterozoic rocks of northern Colorado to the Archean Wyoming craton was accomplished primarily by large-scale thrusting. Following accretion of individual thrust blocks, the boundary zone was steepened by folding and reactivated locally during a period of strike-slip movement. Presence of similar lithologies and shear zones south of the Cheyenne belt suggests that the southern margin of the Wyoming craton may have been a long-lived zone of crustal accretion.

UR - http://www.scopus.com/inward/record.url?scp=84879571623&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84879571623&partnerID=8YFLogxK

U2 - 10.1130/SPE235-p1

DO - 10.1130/SPE235-p1

M3 - Article

AN - SCOPUS:84879571623

VL - 235

SP - 1

EP - 12

JO - Special Paper of the Geological Society of America

JF - Special Paper of the Geological Society of America

SN - 0072-1077

ER -