Plasticity of Cryolite and Brecciation in the Cryolite Deposit, Ivigtut, South Greenland
Two breccia samples from the Ivigtut cryolite deposit are described because they obviously were formed under conditions not involving intensive chemical reactions between the rock fragments and the cryolite which acts as a cementing material in the breccias. In order to explain the breccia formation it seems that it is necessary to expect cryolite to have a rather high mobility as a plastic solid at moderately elevated temperatures. Such a behaviour of cryolite must be taken into account also in the evaluation of the formation of the deposit, because it may have obliterated much of the early formed structures within the deposit.
KeywordsQuartz Graphite Sulphide Fluoride Brittle
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