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.
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).