Limits on the tectonic significance of rapid cooling events in extensional settings: insights from the Bitterroot metamorphic core complex, Idaho-Montana

M. A. House, K. V. Hodges

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Rapid cooling events deduced from thermochronologic data are often interpreted to be coincident with the age of extensional denudation in metamorphic core complexes. 40 Ar/ 39 Ar data for mylonitic and nonmylonitic footwall rocks from the Bitterroot core complex, Idaho-Montana, US, Challenge this view. Newly obtained hornblende 40 Ar/ 39 Ar cooling ages for samples collected from the mylonite zone suggest a time lag of ~1-3 m.y. between the age of unroofing and the time of thermal reequilibration. These data suggest caution in the use of 40 Ar/ 39 Ar data from the footwalls of metamorphic core complexes to suggest the precise age of tectonic denudation. -from Authors

Original languageEnglish (US)
Pages (from-to)1007-1010
Number of pages4
JournalGeology
Volume22
Issue number11
DOIs
StatePublished - Jan 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Geology

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