Orbicular granite - Wikipedia
Orbicular granite (also known as orbicular rock or orbiculite) is an uncommon plutonic rock type which is usually granitic in composition. 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 ...
What Is Orbicular Granite? - Geology In
Orbicular granite is a unique and visually distinctive type of granite characterized by the presence of orbicular (rounded) structures or concretions within the rock matrix. These orbicular structures are composed of concentric layers of minerals, creating spherical or ellipsoidal patterns that stand out against the background of the granite.
A Geologist’s Definitive Guide to Granite Rock | Geology Base
2023年8月29日 · Orbicular granite has nearly spheroidal or ovoid structures or nodules known as orbiculates (a few to 10s of centimeters). These orbiculates have concentric layers of contrasting texture and mineralogy, i.e., mafic/felsic (biotite and plagioclase).
Boogardie Orbicular Granite — the oldest in the world - ArcGIS …
Geology Explorer. Boogardie Orbicular Granite — the oldest in the world
Orbiculite: Mineral information, data and localities. - mindat.org
A coarse grained igneous rock with an orbicular structure. It may be a granite, granodiorite, diorite or gabbro. The orbicules are concentrically layered, spheroidal structures composed mostly of feldspars and mafic minerals, formed by rapid nucleation in a magma.
A geological oddity; orbicular granites of Tasmania
2015年10月16日 · Orbicular granite near Trial Harbour – Tasmania, Australia. Odd orbicules? The northeast and west coast of Tasmania contain large granite batholiths around ~360 million years old. One of the largest ones is called the Heemskirk granite, and it is exposed along the shore at Trial and Granville Harbour, near the town of Zeehan in western Tasmania.
Orbicular granite - Geology Wiki
Orbicular granite (also known as orbicular rock or orbiculite) is an uncommon plutonic rock type which is usually granitic in composition. 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.
Field and petrographical insight into the formation of orbicular ...
2024年7月10日 · Abstract. The diversity of orbicule types exposed within granitoids of the Bonney Pluton in southern Victoria Land attests to the dynamic and complex interplay of magmatic processes that were responsible for their formation. Orbicules formed in small pockets of H 2 O-rich silicate melt that was extracted from the crystallizing and fractionating ...
Orbicular granite - National Rock Garden
This unusual granitic rock, located on Boogardie Station, is one of a few orbicular granite localities known worldwide. The orbicular granite is hosted by a pink, medium-grained, late Archean granitic rock, comprising myrmekitic biotite granodiorite that becomes tonalitic in places.
Orbicular Granite, Youanmi Terrane
This site records orbicular texture in a granite: there are orbicles impinging onto each other, there are broken up orbicles, this is a a biotite granite. This is part of Roberto's Geosite.