How tightly does calcite e-twin constrain stress?

• 山路, 敦

抄録

Mechanical twinning along calcite e-planes has been used for paleostress analyses. Since the twinning has a critical resolved shear stress at ∼10 MPa, not only principal stress axes but also differential stress can be determined from the twins. In this article, five-dimensional stress space used in plasticity theory was introduced to describe the yield loci of calcite e-twinning. The constraints to paleostress from twin and untwin data and from calcite grains twinned on 0, 1, 2 and 3 e-planes were quantified by using their information contents, which were defined in the stress space. The orientations of twinned and untwinned e-planes are known to constrain not only stress axes but also differential stress, D, but they loose the resolution of D if the twin lamellae were formed at D greater than 50–100 MPa. On the other hand, it is difficult to observe twin lamellae subparallel to a thin section. The stochastic modeling of this effect showed that 20–25% of twin lamellae can be overlooked. The degradation of the constraints by this sampling bias can be serious especially for the determination of D.

Erratum to “How tightly does calcite e-twin constrain stress?” [J. Struct. Geol. 72 (2015) 83–95] Journal of Structural Geology, Volume 80, November 2015, Page 1 => j.jsg.2015.08.004.pdf

収録刊行物

• Journal of Structural Geology

  Journal of Structural Geology 72 83-95, 2015-03

  Elsevier Ltd.

キーワード

• Mechanical twin
• Yield locus
• Differential stress space
• Information content
• Sampling bias
• Paleostress

詳細情報

• CRID: 1050564285772406400
• NII論文ID: 120005698039
• NII書誌ID: AA00259438
• ISSN: 01918141
• HANDLE: 2433/203650
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles