Accession Number : AD0690511

Title :   EXPERIMENTAL DEFORMATION OF HORNBLENDE AND AMPHIBOLITE.

Descriptive Note : Environmental research papers no. 299,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Rooney,Thomas P. ; Riecker,Robert E.

Report Date : FEB 1969

Pagination or Media Count : 32

Abstract : Amphibolite and hornblende were deformed in shear type apparatus, with over 200 tests run at conditions to 80 kb and 900C. Intragranular deformation was observed as undulatory extinction, deformation twins and kink bands. Kink band geometry tentatively establishes the slip system as T = (100), t = c. Shear strength at low temperatures, high pressures, and fast strain rates (27C, 40-50 kb, 0.10/sec), ranges between 11.6 and 12.8 kb for both hornblende and amphibolite. At 900C, shear strength decreases to less than 5 kb. Only thermally activated weakening manifests in shear tests. (Author)

Descriptors :   (*ROCK, MINERALS), (*MINERALS, DEFORMATION), SHEAR STRESSES, MECHANICAL PROPERTIES, PETROGRAPHY, SINGLE CRYSTALS, THERMAL ANALYSIS, STRAIN(MECHANICS), TEST METHODS

Subject Categories : Geology, Geochemistry and Mineralogy
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE