What is basalt breccia?
breccia, composed of several mare type basaltic rocks, which was exposed for a short time to high. temperatures so that the original matrix recrystallized. and boundaries of rock clasts became less distinct.”
Is basaltic a andesitic?
Basaltic andesite is a volcanic rock that is intermediate in composition between basalt and andesite. Basaltic andesite can be found in volcanoes around the world, including in Central America and the Andes of South America.
How are basalt and andesite related?
Andesite is a fine-grained rock that forms when the magma erupts onto the surface and crystallizes quickly. Andesite and diorite have a composition that is intermediate between basalt and granite. This is because their parent magmas formed from the partial melting of a basaltic oceanic plate.
What is andesite porphyry?
Andesite-porphyry is a porphyry with andesitic chemism. The term “porphyry” is used for igneous rock composed of large, conspicuous crystals (phenocrysts) and a fine grained to glassy groundmass (matrix) in which the phenocrysts are embedded.
How do basaltic rhyolitic and andesitic differ?
High temperature and low SiO2 content result in fluid magma (basaltic). Lower temperature and high SiO2 contents result in viscous magma (andesitic and rhyolitic magma). Explosive eruptions are characteristic of viscous andesitic and rhyolitic magmas with high gas contents.
What is the difference between andesitic and basaltic magma?
Basaltic magma is high in iron, magnesium, and calcium but low in potassium and sodium. Andesitic magma has moderate amounts of these minerals, with a temperature range from about 800oC to 1000oC (1472oF to 1832oF). Rhyolitic magma is high in potassium and sodium but low in iron, magnesium, and calcium.
What minerals are abundant in basaltic andesitic and rhyolitic?
There are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition. All types of magma have a significant percentage of silicon dioxide. Basaltic magma is high in iron, magnesium, and calcium but low in potassium and sodium.
How do you distinguish between rhyolite and andesite?
is that andesite is (geology) a class of fine-grained intermediate igneous rock, of volcanic origin, containing mostly plagioclase feldspar while rhyolite is (geology) an igneous, volcanic (extrusive) rock, of felsic composition, with aphanitic to porphyritic texture.
What are basalt characteristics?
basalt, extrusive igneous (volcanic) rock that is low in silica content, dark in colour, and comparatively rich in iron and magnesium. Basaltic lavas are frequently spongy or pumiceous; the steam cavities become filled with secondary minerals such as calcite, chlorite, and zeolites.
What is andesite porphyry used for?
Andesite may be used as aggregate or fill, but it is not ideal for concrete applications because it is high in silica, and causes alkali-silica reactivity in the concrete. Andesitic volcanism is associated closely with porphyry copper deposits and it is a host rock for much of the world’s copper ore.