This Archaean greenstone belt is predominantly composed of tholeiitic
basalt lava and volcaniclastic deposits, ultramafic rocks, felsic volcanic rocks and sediments surrounded by younger Archaean granitoids.
The western segment is dominated by a thick sequence of tholeiitic
basalt with common BIF units, typical of the Southern Cross Granite Greenstone Terrane (Wyche, 1999).
It is important to note that K shows maximum positive loading (0.814) in the sixth component, probably due to the tholeiitic
nature of the BO.
And as originated from the seabed basalt eruption in the Tethys ridge and the plate subduction that led to the ultimate close of the Hymalayas-Tethys Ocean, it has typical character of the tholeiitic
basalt in the mid-ocean ridge, providing evidence of collision between the Eurasian and the Indian Plate.
Geology and tectonics of the Boa Vista Basin (Paraiba, northeastern Brazil) and geochemistry of associated Cenozoic tholeiitic
Basalt samples from the Ketchum Brook Formation are similar in that the four samples span the tholeiitic
, transitional, and calc-alkaline fields.
The eruptive products were alkali and tholeiitic
basalts, trachyte and comendite lavas, and pyroclastic equivalents .
The second case regards volcanic glasses with extremely low total Sr content (i.e., tholeiitic
Recent classification (Branca & al., 2011) grouped this products in the Basal Tholeiitic
Supersynthem and the literature data are agree to date the eruptive phenomena at about 500000 years ago.
Leaching experiments have been conducted on biotite granites and tholeiitic
basalts at room temperature and under acidic conditions.
Mineral-melt interaction during late stage crystallization has been identified in rocks of variable geochemical affinity, including tholeiitic
(Gillis, 1996; Tribuzio et al., 1999b, 2000; Coogan et al., 2001) and continental calc-alkaline magmas, the latter sometimes associated with post-collisional geodynamic settings (Monjoie et al., 2005; Tiepolo and Tribuzio, 2005; Renna et al., 2006).