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amphibolite |
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amphiboliteIgneous or metamorphic rock composed largely or dominantly of amphibole minerals. For igneous rocks, the term hornblendite is usually used and is more restrictive; hornblende is the most common amphibole. Metamorphic amphibolites are more widespread and variable than igneous ones. Typically, they are medium- to coarse-grained and are composed of hornblende and plagioclase. Basic igneous rocks such as basalts and gabbros (see acid and basic rocks) can be the parent rocks of amphibolite. |
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? Mentioned in | ? References in periodicals archive | |
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The supracrustal rocks are
generally metamorphosed to amphibolite facies, less commonly to
granulite facies, and rarely to greenschist facies. Mineralization at Dreadnought occurs within two zones, the
northwest and southeast, of albitized, stockworked and sulphidized
diorite hosted within amphibolite grade basalts. In the south,
some basement rocks that were metamorphosed to amphibolite grade are now
exposed as a result of post-contractional extension (e. |
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