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amphibolite

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amphibolite

Igneous 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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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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