granophyre


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granophyre

[′gran·ə‚fīr]
(petrology)
A quartz porphyry or fine-grained porphyritic granite.
References in periodicals archive ?
Dickin, A.P., Exley, R.A., 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.
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. The results are consistent with previous fluid inclusion studies from the study area and reveal that the saline brines previously reported from the region and deemed partially responsible for the transport and deposition of silver in the Cobalt region were in equilibrium with the later stages of the Nipissing intrusions.
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 studied area shows structural concordance between the conspicuous foliation (N60[degrees]-70[degrees]) exposed in the granophyres and the brittle deformation trends (E-W and N70[degrees]) affecting all the Mesozoic rocks, including the regional trend of the Sierra San Miguel