Magnitude of σ1, σ2, and σ3 at mid-crustal levels in an orogenic belt: Microboudin method applied to an impure metachert from Turkey

Toshiaki Masuda, Shotaro Nakayama, Nozomi Kimura, Atsushi Okamoto

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We revised an equation for estimating palaeostress magnitude using the microboudin technique by incorporating the influence of time on the fracture strength of minerals. The equation was used to estimate triaxial palaeostresses from a rare sample of metachert from Turkey that contains microboudinaged, columnar tourmaline grains in a wide range of orientations within the foliation plane. The estimated principal palaeostresses are σ1 = 605 MPa, σ2 = 598 MPa, and σ3 = 597 MPa. As the microboudinage is considered to have occurred immediately before the rock encountered the brittle-plastic transition during exhumation, these stress values correspond to conditions at approximately 18 km depth and 300 °C within a Cretaceous orogenic belt.

Original languageEnglish
Pages (from-to)230-236
Number of pages7
JournalTectonophysics
Volume460
Issue number1-4
DOIs
Publication statusPublished - 2008 Nov 15
Externally publishedYes

Keywords

  • Exhumation
  • Metachert
  • Microboudin
  • Principal stresses
  • Tourmaline

ASJC Scopus subject areas

  • Geophysics
  • Earth-Surface Processes

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