Geochronology of blueschists from west-central Baja California and the timing of uplift in subduction complexes

S. L. Baldwin, T. M. Harrison

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

A geochronologic study of blueschists from west-central Baja California has provided constraints on the timing of high-pressure, low-temperature metamorphism and the subsequent uplift of this subduction complex. Mineral separates from coherent blueschists and blueschist blocks enclosed in serpentinite melange were analyzed by 40Ar/39Ar, fission track, and Rb/Sr methods. The relatively slow uplift rate and lack of any higher temperature overprinting assemblages in the coherent blueschists suggest that synsubduction uplift was gradual and proceeded through a dynamic accretionary wedge characterized by low geothermal gradients. An increase in uplift rate (to 1.0 mm/yr) during post-Miocene time coincides with a change from a convergent to a transform plate boundary. -from Authors

Original languageEnglish (US)
Pages (from-to)149-163
Number of pages15
JournalJournal of Geology
Volume97
Issue number2
DOIs
StatePublished - Jan 1 1989
Externally publishedYes

ASJC Scopus subject areas

  • Geology

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