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A coarse-grained igneous rock consisting primarily of quartz, plagioclase feldspar, and potassium feldspar, and also containing biotite, hornblende, or pyroxene.

gran′o·di′o·rit′ic (-rĭt′ĭk) adj.


(Geological Science) a coarse-grained acid igneous rock containing almost twice as much plagioclase as orthoclase: intermediate in composition between granite and diorite
[C19: from grano + diorite]
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References in periodicals archive ?
The Project area contains four principal gold bearing quartz veins that were previously mined via shallow open pits within granodiorite host rocks.
Geology Type granite-gneiss and retrograde granulite gneiss with minor amounts of granite and granodiorite.
Additionally, tin and tantalum mineralisation, in quartz and pegmatite veins within a granodiorite host, has been identified by on-site geologists in a number of samples.
This volcanic unit is interpreted to form a thin veneer which overlies the granodiorite unit that is the host of most mineralization at FGM.
0 Ma (U-Pb zircon) and is inferred to be coeval with or slightly older than the Lake George granodiorite (412 +5/-4 Ma, U-Pb zircon).
Porphyritic granodiorite occurs 7-8 km to the north or 6-7 km to the east of Vale de Rodrigo; it must have been transported from there.
The objective of the first phase of drilling will be to 1) confirm some of the historical gold intersections in proximity to the past-producing Standard Gold mine and 2) test the host granodiorite intrusion for possible extensions to gold mineralization along sections spaced 700 meters apart.
The predominant Freistadt s granodiorite can be found in solid form or in coarse blocks.
Gold mineralisation at the Kourouba Prospect is hosted by intensely hematite-feldspar-chlorite altered granodiorite.
Copper mineralisation consisting of native copper, chalcocite, bornite, chalcopyrite, and malachite is hosted in a broad northwest-trending zone of altered granodiorite and occurs as disseminations, along fractures and in veins.
The highest Hg concentrations in the granitoid rocks are in samples from the Boot Lake Granodiorite, which contains up to 32% biotite.
Continental arcs are well developed in the northeastern Superior Province, where hydrous to charnockitic granodiorite and tonalite crystallized as massive vertical sheets between 2.