The second option involving the presence of buried granite batholiths is preferred.
Two granite batholiths.
A batholith from greek bathos depth lithos rock is a large mass of intrusive igneous rock also called plutonic rock larger than 100 square kilometres 40 sq mi in area that forms from cooled magma deep in the earth s crust batholiths are almost always made mostly of felsic or intermediate rock types such as granite quartz monzonite or diorite see also granite dome.
Batholith definition a large body of intrusive igneous rock believed to have crystallized at a considerable depth below the earth s surface.
The batholith is approximately 85 km long 35 km wide and 10 km thick.
Batholith large body of igneous rock formed beneath the earth s surface by the intrusion and solidification of magma it is commonly composed of coarse grained rocks e g granite or granodiorite with a surface exposure of 100 square km 40 square miles or larger a batholith has an irregular shape with side walls that incline steeply against the host rock.
It is roughly 320 kilometers long by 120 kilometers wide and 8 kilometers thick.
Four magmatic fabrics in the tuolumne batholith central sierra nevada california usa.
On the eastern side of the batholith is the satellitic uljalegi rapakivi granite pluton.
The idaho batholith is composed of cretaceous granite and granodiorite and covers approximately 35 000 km 2 in central idaho.
This along with its heat is what allows the rock to rise.
Introduction to the idaho batholith.
In africa there is the aswan granite batholith in egypt the cape coast batholith in ghana darling batholith in south africa and the mubende batholith in uganda.
The atlanta lobe and the bitterroot lobe of the idaho batholith figure 1 are separated by middle proterozoic belt supergroup metamorphic rocks in.
Implications for interpreting fabric patterns in plutons and evolution of magma chambers in the upper crust.
Most batholiths are composed of felsic rock such as granite which is less dense than mafic rock like basalt.
The salmi rapakivi granite anorthosite batholith is situated at the contact between the archean granite gneiss greenstone belt basement and paleoproterozoic svecofennian orogenic belt.
