The size of the fluorescent YAG phase with Ce in the granophyric
texture can be controlled by growth rate.
Most of the rocks are characterized by abundant granophyric
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 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
From our initial mapping we identified a granophyric
horizon in a dolerite/gabbro package of rocks which indicated that we have the right rock types, similar to that found further north in the belt at Kambalda and Kalgoorlie.
It also tends to be finer grained, and interstitial granophyric
texture is typically present.
17-57] from rim to core) in a fine-grained groundmass consisting of granophyric
quartz and K-feldspar.
(more wormy) to graphic (more cuneiform) intergrowths between feldspar and quartz are evident in three samples (DDH 79-6-174.
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.
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.