granophyre


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granophyre

[′gran·ə‚fīr]
(petrology)
A quartz porphyry or fine-grained porphyritic granite.
References in periodicals archive ?
Isotopic and geochemical evidence for magma mixing in the petrogenesis of the Coire Uaigneich Granophyre, Isle of Skye, NW Scotland, Contrib.
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.
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
It seems that there are more of these small, individual working sites further north at about this level on the hillside, probably extending as far as the zone where the granophyre rock of Conachair takes over.
The balance of this evidence suggests that at least some of the implements were not part of a recent deposit of field clearance stones; their numbers are greater than would be predicted by the ratio of broken dolerite implements to pieces of granophyre and fire-cracked beach pebbles in clearance dumps visible today.
2) The majority of samples contain a mesostasis, which is dominated by skeletal Fe-Ti oxides, Fe-rich clinopyroxene, and apatite with associated granophyre.
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.