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diorite
(redirected from dioritic)

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diorite

Igneous rock intermediate in composition between mafic (consisting primarily of dark-coloured minerals) and felsic (consisting primarily of light-coloured minerals) – the coarse-grained plutonic equivalent of andesite. Constituent minerals include feldspar and amphibole or pyroxene with only minor amounts of quartz.



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? Mentioned in ? References in periodicals archive
 
Hole R05-04 was drilled to the northeast through the contact zone and into the dioritic intrusives and Takla volcanic rocks.
The hole encountered polymict diorite breccia and dioritic intrusives from 327m to hole end at 933m.
The dioritic intrusives are moderately to strongly altered to clay-chlorite with minor secondary
 
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