22b), samples from the John Lee Brook and Utopia granites plot in the fields of high-K; whereas the sample from the Wellington Lake Granite is associated with the
shoshonite series.
Besides, the granite member of the HP displays a slightly more potassic character by plotting within the
shoshonite field.
The magmatic series of these intrusive bodies are
shoshonite and high K calc-alkaline and are of the I type (Ghorbani, 2013).
In order to separate calc-alkaline series with low potassium, average potassium and high potassium and
shoshonite ones, [7] diagram is used that is based on K2O quantities in SiO2.
The bimodal volcanic rocks like to East Africa rift, consisted of kamafugite, carbonatite,
Shoshonite, rhyolite and/or trachyte.
Shoshonite is an alkali-rich ([Na.sub.2]O + [K.sub.2]O > 6.5 wt %) trachyandesite that occurs in continental rift, collisional and arc settings (Rogers and Setterfield 1994).
The focus of much of this exploration is the Ordovician
shoshonite volcanics and related monzonitic intrusions of the central and eastern portions of the Lachlan Fold Belt or Orogen.
1989), samples from the MBG plot in the fields of high-K and
shoshonite series, whereas those from the MPG fall into the field of medium K (Fig.
The rocks of the chilled margins and the central facies are classified as tephrites, basalts, basaltic andesites and
shoshonites whereas the pegmatoid facies includes the most evolved rocks: andesites and dacites (Fig.
They are clearly different from crustal contaminated, postcollisional Islamic peninsula
shoshonites and ultrapotassic rocks.