All of these are mixed with gneissic
igneous acidic and, above all, by the basic ultramafic rocks (Vera & al, 2004).
According to Ab'Saber (1974) a strong erosional process took place in the region during the Tertiary period, exposing the pre-cambrian granitic and gneissic
basement of the region and resulting in a degraded (geologically speaking) landscape composed mostly of areas of low altitude.
The older rocks in this massif include the gneissic
basement of the Cocha--Rio Tellez Complex and associated meta-sedimentary rocks considered Precambrian and Paleozoic in age (Murcia and Cepeda, 1983; Ponce, 1979).
Majority of Kodaganar basin (around 65%) has gneissic
Raeside and Barr (1990) subdivided these rocks into two assemblages based on metamorphic grade: mainly lower grade units collectively termed the George River metamorphic suite and mainly higher grade and typically gneissic
units termed the Bras d'Or metamorphic suite.
Inselbergs are monolithic mountains or groups of mountains that appear abruptly amidst the landscape, consisting mainly of granitic or gneissic
rocks (POREMBSKI et al, 1998; POREMBSKI and BARTHLOTT, 2000).
These last authors argued that this distinction is not entirely reliable in discerning between the larger contribution of a granitic versus a gneissic
origin, as this depends on factors related to each single pluton.
2014a; 2015a and b), were studied for the purpose of morphologic comparison with gneissic
and granitic massifs.
texture biotite hornblende pyroxene opaque and muscovite were not observed.
The occurrence of Sn-W mineralization is controlled by the contact between granite and the gneissic
Granitic and gneissic
outcrops (inselbergs) as centers of diversity for desiccation-tolerant vascular plants.
Graphite veins can be found in crystalline marbleized limestones associated with granitic and gneissic