Factors affecting finite strain estimation in low-grade, low-strain clastic rocks

Daniel Pastor-Galán, Gabriel Gutiérrez-Alonso, Kieran F. Mulchrone, Patrick Meere

January, 2009

Abstract

The computer strain analysis methods SAPE, MRL and DTNNM have permitted the characterization of finite strain in two different regions with contrasting geodynamic scenarios; (1) the Talas Ala Tau (Tien Shan, Kyrgyzs Republic) and (2) the Somiedo Nappe and Narcea Antiform (Cantabrian to West Asturian-Leonese Zone boundary, Variscan Belt, NW of Iberia). The performed analyses have revealed low-strain values and the regional strain trend in both studied areas. This study also investigates the relationship between lithology (grain size and percentage of matrix) and strain estimates the two methodologies used. The results show that these methods are comparable and the absence of significant finite strain lithological control in rocks deformed under low metamorphic and low-strain conditions.

Type

Journal article

Publication

Journal of Structural Geology 31(12) pp. 1586-1596, DOI:10.1016/j.jsg.2009.08.005

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Structural Geology

Factors affecting finite strain estimation in low-grade, low-strain clastic rocks

Abstract

Daniel Pastor-Galán

Científico Titular and Assistant Professor (助教) of Tectonics