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Factors influencing rock competence: Data from a Swedish conglomerate

Lisle, Richard John and Savage, John 1983. Factors influencing rock competence: Data from a Swedish conglomerate. Geologiska Foereningen i Stockholm Foerhandlingar 104 (3) , pp. 219-224. 10.1080/11035898309455258

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Quartzite pebbles from a polymict conglomerate deformed under amphibolite facies conditions occurring on Artfjället, Västerbotten, appear less deformed than subarkosic pebbles with up to 25% non-quartz minerals (principally feldspar). Compositional, volumetric and textural variables of a number of pebbles have been compared to the deformed pebble shape. It has been found that the grain-size measure of the material making it up is statistically the most useful independent variable for predicting the shape of a deformed pebble. The less deformed pebbles have a coarser grain-size and this negative correlation could be taken to indicate a contribution to the strain development of a grain-size sensitive deformation mechanism. Contrary to expectation mineral proportions proved to be poor predictors of the deformed shapes. A slight tendency exists for large pebbles to exhibit more deformed shapes; a trend confirmed at other widely spaced localities in the area.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Uncontrolled Keywords: Deformed conglomerate ; strain analysis ; relative competence ; grain-size sensitive mechanism (GSSM); Artfjället ; Scandinavian Caledonides ; Västerbotten County ; northwestern Sweden
Publisher: Geologiska föreningen (Sweden)
ISSN: 0016-786x
Last Modified: 04 Jun 2017 02:11

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