granophyre

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granophyre

[′gran·ə‚fīr]
(petrology)
A quartz porphyry or fine-grained porphyritic granite.
References in periodicals archive ?
A combination of the mapping and geophysics highlighted an important aspect where the geological orientation over a 6km strike length is 25 degree different to the regional grain, producing an ideal setting for dilational zones to form within favourable stratigraphy (the granophyric zone) into which gold bearing fluids can migrate and be deposited.
This work showed that Treasure Island had the right geology (the granophyric zone), a change in geological orientation and major structural features like the Boulder-Lefroy Fault with a lot of evidence of multiple fault splays coming off the Boulder-Lefroy Fault as well as tremendous surface evidence of the gold bearing quartz veins on the Island (see ASX releases dated 1st November 2010, 25th November2010 & 4th March 2011).
This petrographic feature is also observed as an interstitial granophyric intergrowth, and occurs plagioclase and clinopyroxene crystals with intergranular arrangement, in association with K-feldspar and quartz.
The diabase sills are generally ~300 m thick and comprise a range of rock types from fine-grained border facies through coarse-grained amphibole-bearing diabase to late stage granophyric diabase.
The hypersthene diabase grades upward into diabase with variable texture and grain size, and is locally aplitic, granophyric or pegmatitic.
A combination of the mapping and geophysics highlighted an important aspect where the geological orientation over a six kilometre strike length is 25 degrees different to the regional grain, producing an ideal setting for dilational zones to form within favourable stratigraphy (the granophyric zone) into which gold bearing fluids can migrate and be deposited.
So we've got the right geology (the granophyric zone), a change in geological orientation and major structural features like the Boulder-Lefroy Fault with a lot of evidence of multiple fault splays coming off the Boulder-Lefroy Fault as well as tremendous surface evidence of the gold bearing quartz veins on the Island.
The fine-grained groundmass and minor granophyric (wormy) to more prevalent graphic (cuneiform) texture resulted from quench crystallization (low degrees of supercooling) of the dyke, possibly enhanced by vapour exsolution and depressurization (see Fenn 1986; Lentz and Fowler 1992).
The depth of emplacement of the Wedgeport pluton was likely epizonal, based on the presence of a well-developed contact metamorphic aureole containing cordierite and andalusite, and localized development of porphyritic, granophyric, and inequigranular textures near the margins.
The upper margin of the granite consists of an almost continuous layer of fine-grained, pink, felsic rock varying from featureless felsite to microgranite with abundant granophyric intergrowth and drusy miarolitic cavities, to rhyolite porphyry that is commonly spherulitic.
Granophyric textures are common, suggesting that these plutons may be the high-level intrusive equivalents of the Dipper Harbour volcanic rocks, with which they show close spatial association (Figs.
hut now Granodiorite sheared and deformed, with mylonitic bands common; relict granophyric texture observed in one sample.