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granodiorite

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granodiorite

Medium- to coarse-grained rock that is one of the most abundant intrusive rocks. It contains quartz and is distinguished from granite by having more plagioclase feldspar than orthoclase feldspar; its other mineral constituents include hornblende, biotite, and augite. Granodiorite is similar to granite in appearance but darker.


granodiorite [¦gra·nō′dī·ə‚rīt]
(petrology)
A visibly crystalline plutonic rock composed chiefly of sodic plagioclase, alkali feldspar, quartz, and subordinate dark-colored minerals.


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Seven holes totaling 485 metres were drilled on the U Zone, a massive quartz vein structure hosted in sheared and altered granodiorite.
5 km wide in granodiorite, surrounded by volcanic rocks.
In this area the higher grade Mo mineralization was known to be interrupted by barren dykes and low grade granodiorite.
 
 
 
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