granophyre

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granophyre

[′gran·ə‚fīr]
(petrology)
A quartz porphyry or fine-grained porphyritic granite.
References in periodicals archive ?
The size of the fluorescent YAG phase with Ce in the granophyric texture can be controlled by growth rate.
The grown samples had microscopic granophyric texture with YAG and [Al.sub.2][O.sub.3] phases, where YAG and [Al.sub.2][O.sub.3] can be easily identified as white and black regions in BEI, respectively (Figure 2(a)-(c)).
Most of the rocks are characterized by abundant granophyric intergrowths (Fig.
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.
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.
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.
It also tends to be finer grained, and interstitial granophyric texture is typically present.
4g) is fine-to medium-grained, and consists of zoned phenocrysts of plagioclase (ranging [An.sub.17-57] from rim to core) in a fine-grained groundmass consisting of granophyric quartz and K-feldspar.
Granophyric (more wormy) to graphic (more cuneiform) intergrowths between feldspar and quartz are evident in three samples (DDH 79-6-174.3, DDH 81-26-63.4, and DDH83-1-37.5; Fig.
Granophyric texture occurs only in samples from the northwestern part of the intrusion; that area may represent the shallowest part at the time of emplacement.
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.