Deformation mechanisms in experimentally and naturally deformed amphiboles |
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| Authors: | G Dollinger JD Blacic |
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| Institution: | 1. Geophysics Program, University of Washington, Seattle, Wash. USA |
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| Abstract: | Experimental deformation of an igneous hornblendite at 600–750°C, 10 kbars confining pressure and a strain rate of 10 ?5 sec?1 results in kink bands whose normals cluster about 001] and axes of external rotation subparallel to 010]. This is consistent with glide on the system T = (100), t = 001]. At temperatures of 800°C to the breakdown temperature of the hornblende, external rotation axes spread along the (100) plane although kink band boundary poles remain subparallel to 001]. This indicates glide on the (100) plane in variable directions. Analysis of bend zones in a naturally deformed actinolite indicates glide on the (100), 001] system. Mechanical (101) twinning was not observed in any of the samples, and we suggest that in these amphiboles the critical resolved shear stress for glide is lower than that for twinning. |
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