granophyre


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granophyre

[′gran·ə‚fīr]
(petrology)
A quartz porphyry or fine-grained porphyritic granite.
References in periodicals archive ?
The granophyre dyke is cut by a 10-30 cm thick darker and coarser dyke which is locally in networks.
Isotopic and geochemical evidence for magma mixing in the petrogenesis of the Coire Uaigneich Granophyre, Isle of Skye, NW Scotland, Contrib.
The main rock-types are ultramafic to mafic, but granites, granophyres and felsites, containing economic tin deposits, fluorite and pegmatite minerals are also present (Cairncross and Dixon, 1995).
Several mineralized veins cut across gabbro, granophyres and felsites.
The pioneer geological works in the Sierra San Miguel correspond to Walther (1927), Caorsi & Goni (1958) and Bossi & Fernandez (1963) and it has been described as a volcanic/sub-volcanic association composed by granophyres and, subordinated rhyolites.
The granophyres are progressively covered by rhyolitic lava flows.
These granophyres are mineralogical and petrographycally homogeneous.
The first type corresponds to basic dykes which vertically cross-cut the granophyres.
Other small gabbroic intrusions appear as wedges or secondary dykes; all injected through the granophyres.
Fluid inclusion studies on zoned quartz crystals from the granophyric phase of the Nipissing diabase have been used to determine the pressures, temperatures, and compositions of the fluids associated with the Nipissing granophyres.