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Orbicular granite australia. Orbicular granite also known as orbicular rock or orbiculite is an uncommon plutonic rock type which is usually granitic in composition. This is part of roberto s geosite. Put your short company information here. These rocks have a unique appearance due to orbicules concentrically layered spheroidal structures probably formed through nucleation around a grain in a cooling magma chamber due to rapid physical changes almost one third of known orbicular rock.
They consist of andesine plagioclase hornblende biotite arranged radially around a core of plagioclase or hornblende or less commonly mafic schist. The orbicules occur in a granodiorite matrix. Roberto weinberg monash university australia. Large number of pages viewed.
It has been dated at 2 7 thousand million years old. This unusual granitic rock located on boogardie station is one of a few orbicular granite localities known worldwide. There are orbicles impinging onto each other there are broken up orbicles this is a a biotite granite. Orbicular granite this geologically interesting rock comes from near mount magnet in western australia.
Orbicular granite sphere from australia. Here is a link to a site with. This site records orbicular texture in a granite. Some of the more spectacular are found in igneous rocks with the compositional range from diorite to granite.
Orbicular granite sphere from australia. The orbicular granite deposit is located 35 km west of mount magnet in western australia. 2 inch diameter 0 5 lbs. Posts about orbicular granite written by dimcfarlane369.
The orbicular granite deposit. The orbicular granite is hosted by a pink medium grained late archean granitic rock comprising myrmekitic biotite granodiorite that. The western australian deposit is located at mt. It constitutes one of the largest concentrations of orbicules yet documented.
Dodging many goats and emus on the bush tracks we stopped at congoo railway dam on neighbouring munbinia station to see the engineering marvel comprising a low stone wall that entirely surrounds the base of a large granite outcrop to capture and direct rainwater via a stone channel into a nearby dam. Nicely defined orbs in this australian orbicular granite sphere.
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