(redirected from Diorites)
Also found in: Thesaurus, Encyclopedia.


Any of various dark, granite-textured, crystalline rocks rich in plagioclase feldspar and having little quartz.

[French, from Greek diorizein, to distinguish : dia-, apart, between; see dia- + horizein, to divide, limit; see horizon.]

di′o·rit′ic (-rĭt′ĭk) adj.


(Minerals) a dark coarse-grained igneous plutonic rock consisting of plagioclase feldspar and ferromagnesian minerals such as hornblende
[C19: from French, from Greek diorizein to distinguish (from dia- apart + horizein to define) + -ite1]
dioritic adj


(ˈdaɪ əˌraɪt)

a granular igneous rock consisting essentially of plagioclase feldspar and hornblende.
[1820–30; < French < Greek dior(ízein) to distinguish]
di`o•rit′ic (-ˈrɪt ɪk) adj.


A coarse-textured igneous rock, mainly comprising feldspar and pyroxene.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.diorite - a granular crystalline intrusive rockdiorite - a granular crystalline intrusive rock
igneous rock - rock formed by the solidification of molten magma
References in periodicals archive ?
Copper (gold) ore body I and II that have been found are controlled by both surrounding rock and intermediate-acid rock and are generated in the skarns near the contact zone of quartz diorites and marbles and the cracks of quartz diorite respectively.
The spider variation diagrams for granites, granodiorites, diorites and gabbroic diorites show slope ofthe data from LILE towards HFSE and depletion ofNb which are the characteristic features of their calc-alkaline nature related to island arc setup.
Maria Jose is located in the Department of Ancash and the project includes Cretaceous to Paleocene diorites and granitoids of the Coastal Batholith.
A 150 metre mineralised strike length has now been outlined at Undaunted and the deposit remains open at depth, with tightly folded mineralised diorites in the area showing strong similarities to Focus' Countess underground operation nearby.
All five holes of the program have been completed and have confirmed that mineralization, including visible gold in some holes, occurs in association with stockwork-type quartz sulphide veining within albitized diorites developed along north-south trending structural corridors.
The rocks exposed in the study area are highly deformed and include basalt-andesite sheet dominant volcanics and un-deformed volcanic rocks of Ishkoman Volcanic Center / Teru Volcanic Formation of Ghizar Formation and diorites of the Kohistan batholith.
Magnetic data has been useful for detecting magnetic susceptibility contrast among Diorites, basalts, pyroclastic rocks, breccias, mineralised areas and halos of alteration thereby helping to define drill targets together with the results of radiometry and induced polarization surveys.
Un afflux tardif de magma mafique a perturbe les roches mafiques agees et a entraine une hybridation avec le granite, produisant des << diorites >> heterogenes complexes.
Dreadnaught gold mineralization is hosted within albitized diorites along structural corridors, and is considered to be the south extension of the Tindals system.
The whole rock geochemistry of the studied non-porphyritic volcanics of CVG and the gabbroic- diorites of KB are of typical calc-alkaline character showing close affinities to subduction zone geochemical component.
On Reindeer Lake plutons range in composition from diorite to granite, although quartz diorites, tonalites and granodiorites predominate.
As operator of the RJV, MXN has undertaken a comprehensive data compilation for the Redemption Mineralized Corridor where gold occurs in a variety of structural settings including laminated quartz reefs and breccias sited in brittle-ductile shear zones at lithological contacts and interflow sediments and within north-south trending, fractured, albitized diorites hosted within deformed ultramafic rocks.