The dolerite sills that intruded Silurian shales in the Baltic Sedimentary Basin are fractionated subalkaline
rocks of within-plate affinity, as is also clear from their setting in a continental basin.
Geochemistry of subalkaline
and alkaline extrusives from the Kermanshah ophiolite, Zagros Suture Zone, western Iran: implications on Tethyan plate tectonics.
Magmatic affinity of modern and ancient subalkaline
volcanic rocks determined from trace-element discriminant diagrams.
The RHVC is comprised of approximately 40 shallow plutons of alkaline and subalkaline
compositions intruded into Archean - age basement rocks.
The bold dash lines in figure 7 shows that the amphibole schist all plots in the subalkaline
series (Macdonald, 1968).
Geochemically, the rapakivi granites from stocks and from the Riga batholith are subalkaline (Fig.
The mafic rocks from the Abja stock and Riga batholith (except for the anorthosites of the Riga massif) show Fe-rich tholeiitic compositions and plot on the boundary between the alkaline and subalkaline fields in the total alkalis versus silica diagram (Fig.
The closest analogue of the rock on Earth," according to one of the Phobos mission teams, "has been found to be subalkaline
basalt occurring on oceanic seabeds.
Low Nb concentrations in our samples indicate subalkaline
Chemical analyses of non-cumulate gabbroic rocks from Tilting and Seldom show a considerable range of composition, ranging from subalkaline
basalt across the andesite/basalt and andesite fields (Fig.
The granite plutons are subalkaline
to alkaline with the geochemical character of A-type granite (Pe-Piper et al.
2] and Nb/Y indicate that the intrusions are mostly tholeiitic subalkaline
basalt, with some basaltic andesite (Fig.