Evidence for an inverted metamorphic gradient associated with a Precambrian suture, southern Wyoming ( USA).

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Abstract

An inverted metamorphic gradient associated with the N mylonite zone of the Cheyenne belt, a deeply eroded Precambrian suture in S Wyoming, has been documented within metasedimentary rocks of the Early Proterozoic Snowy Pass Supergroup. Metamorphic grade in the steeply dipping supracrustal sequence increases from the chlorite through the biotite, garnet, and staurolite zones both stratigraphically and structurally upward toward the N mylonite zone. A minimum temperature increase of approx 100oC over a km-wide zone is required for this transition. Parallelism of inverted isograds with the trace of the N mylonite zone implies a genetic relationship between deformation associated with that zone and the inverted metamorphic gradient within the Snowy Pass Supergroup.-from Author

Original languageEnglish (US)
Pages (from-to)41-63
Number of pages23
JournalJournal of Metamorphic Geology
Volume6
Issue number1
StatePublished - 1988
Externally publishedYes

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ASJC Scopus subject areas

  • Geology

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