microgranite

microgranite

(ˈmaɪkrəʊˌɡrænɪt)
n
(Geological Science) an igneous rock with an identical composition and mineral content to granite, but having a finer texture
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Caption: Figure 2: Geological map of the study area ([5] E: 1/1000000): 1, anatexite granite; 2, schist; 3, mica schist; 4, syenite; 5, tray basalt; 6, syn-tectonic granite (Monzonitic, discordant with biotite); 7, anatexite or migmatite with biotite); 8, embrechite gneiss; 9, Upper gneiss (grenatifere with two micas); 10, quartzite (Lom group, Mbalmayo-Bengbis, and Ayos); 11, Sedimentary formation of cretaceous; 12, upper mica schist with chlorite (Poli group); 13, low gneiss (with biotite, amphibole, pyroxene, sillimanite and hypersthene); 14, amphibolite (para- and ortho-: greenstones); 15, pelites; 16, post-tectonic granite (microgranite); 17, calcoalkaline orthogneiss.
Noronha, "Multistage growth of a rare-element, volatile-rich microgranite at argemela (Portugal)," Journal of Petrology, vol.
These rocks comprise pink to light grey, some brownish, microgranite and aplite; pegmatites are rare and simple in composition.
Follow up in the Frazer Stream area "identified several drainages with similar microgranite float and some outcrops with a true width of up to 20 metres.
Medium to coarse-grained, possibly granite or microgranite. Generally slightly elongate, sa.
Ruan(12) investigated this with a traverse of soil and soil air samples crossing scheelite and arsenopyrite mineralization in minor intrusive sheets of microgranite and quartz porphyry at Ballinglen, Ireland.
The watershed has a variable lithology: schist, quartzite, sandstone, limestone, and microgranite conglomerate.
2a), and subsidiary phases of medium-grained equigranular granite, equigranular to quartz-feldspar-phyric microgranite, melanocratic biotite granite, and minor aplite and pegmatite (MacLellan et al.
It comprises of basic and acidic alkaline rocks including microporphry, metagabbro, metadolerite, reibeckite gneiss and porphyritic microgranite. A sample from the porphyritic microgranite yields 280 + 16 Ma year U-Pb age on zircon.
They range from aplite to porphyritic microgranite, and rhyolite to quartz trachyte in composition (Jan et al., 1997).
Biotite hornfels is developed locally in the contact zone near Lake Utopia, and equigranular to porphyritic microgranite is common along the southern contact of the granite, consistent with the intrusive relationship (McLeod 1990).