Igneous rocks: Diorite.
Title: Igneous rocks: Diorite.
Category: Society & Culture / Geography | Words: 232 | Pages: 1.0 (approximately 235 words/page)
Igneous rocks: Diorite.
INTRODUCTION.
Diorite is an igneous rock formed from the partial melting of the crust caused from by basaltic magma from the mantle. It is associated with batholiths, dikes and stocks usually around volcanic arcs. Its volcanic equivalent is andesite which is formed from strombolian type volcanoes.
DISCUSSION
Physical properties:
Diorite is a phaneritic rock that is speckled black and white/grey with a very variable colour index of between 40 and 90 over short distances. The rock …
showed first 75 words of 232 total…
You are viewing only a small portion of the paper.
Please login or register to access the full copy.
|
|
…
showed last 75 words of 232 total…pyroxene, biotite. Quartz and alkali feldspar may also be present. When the amount of quartz increases, the rock is named quartz diorite. The rock grades into granodiorite as the amount of quartz and alkali feldspar increases.
Alkali feldspar increase. Some common accessory minerals are apatite, titanite and various iron oxides.
Xenoliths from the partially melted margins of the magma chamber are common.
Origin:
Diorite usually forms along with granite in continental crust above subduction zones.
Need a custom written paper?
