Damon Mcknight
Gneiss is a distinctive and easily recognisable metamorphic rock that is found worldwide. Some of the most notable deposits are located in areas with a history of tectonic activity, such as mountain ranges, and regions with ancient, stable continental crusts. Gneiss is commonly used in construction due to its durability and unique appearance. In Australia, gneiss can be found in the Narryer Gneiss Terrane in Western Australia, which is a geological complex composed of a mixture of granite, mafic intrusions, and metasedimentary rocks. The Yilgarn Craton in Western Australia is another notable gneiss formation.
| Characteristics | Values |
|---|---|
| Location in Australia | Western Australia |
| Specific regions | Yilgarn Craton, Narryer Gneiss Terrane, Jack Hills |
| Gneiss type | Dugel Gneiss, Meeberrie Gneiss, Manfred Complex, Leucocratic Gneiss, Metagranite |
| Notable features | Oldest known samples of the Earth's crust, zircon samples dated at 4.4 billion years old |
| Geology | Tectonically interleaved, polydeformed mixture of granite, mafic intrusions, and metasedimentary rocks |
| Age | Majority of the Narryer Gneiss Terrane is over 3.6 billion years old |
| Texture | Coarse-grained, Medium-grained, high degree of deformation around the margins |
| Appearance | Banded texture, alternating light and dark mineral layers, gneissic banding |
| Composition | Quartz, feldspar, mica, mafic minerals, felsic minerals |
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What You'll Learn
Narryer Gneiss Terrane
Gneiss is a common and highly distinctive metamorphic rock, recognised by its characteristic banding. It is found worldwide, but some of the most notable deposits are located in areas with a history of tectonic activity, such as mountain ranges. Gneiss is also found in regions with ancient, stable continental crusts.
In Australia, the Narryer Gneiss Terrane is a geological complex in Western Australia. It is composed of a tectonically interleaved and polydeformed mixture of granite, mafic intrusions, and metasedimentary rocks. The Narryer Gneiss Terrane is over 3.3 billion years old, with the majority of it in excess of 3.6 billion years old. It is adjacent to the northernmost margin of the Yilgarn Craton and is abutted on the north by the Gascoyne Complex metasedimentary and metagranite orogen. The Narryer Gneiss Terrane has undergone many high-grade polyphase deformation events, with the most notable being at 2600 to 2700 Ma associated with granite-greenstone magmatism in the Yilgarn Craton.
The Narryer Gneiss Terrane includes parts of the Yarlarweelor Gneiss, which abuts the Nabberu Basin metamorphic sequences of the Bryah-Padbury Basins. It is present as discontinuous slivers of metamorphic rocks, pelites, metaconglomerates, and gneisses caught up within regional strike-slip oblique thrust faults. The Narryer Gneiss in this far-eastern region may form the basement to the 2.0-1.8 billion-year-old Proterozoic rocks.
The Narryer Gneiss Terrane is divided into four major rock sequences: the Dugel Gneiss, Meeberrie Gneiss, Manfred Complex, and unassigned polydeformed leucocratic gneisses and metasediments. The Dugel Gneiss is syenogranitic or monzogranitic in composition and is interpreted as the protolith. The gneiss is leucocratic, with only minor amounts of biotite and muscovite. The Meeberrie Gneiss is a generally ductilely deformed banded gneiss of monzogranitic composition. The Manfred Complex is a heavily attenuated and discontinuous series of ultramafic to mafic cumulates contained within a matrix or wall-rocks of mixed Dugel and Meeberrie Gneisses.
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Gneiss in national parks
Gneiss is a common and highly distinctive metamorphic rock, recognised by its characteristic banding. It is formed by the metamorphism of existing rocks under extreme pressure and temperature, deep within the Earth's crust. This process can take millions of years, making gneiss one of the oldest rock types found on Earth.
In Australia, gneiss can be found in the Narryer Gneiss Terrane in Western Australia. This geological complex is composed of a mixture of granite, mafic intrusions, and metasedimentary rocks that are over 3.3 billion years old, with some parts of the terrane exceeding 3.6 billion years in age. The Narryer Gneiss Terrane includes rock sequences such as the Dugel Gneiss, Meeberrie Gneiss, and Manfred Complex, each with its own unique characteristics and geological history.
The ancient rock formations of Uluru and Kata Tjuta in Australia's national parks are a sight to behold, rising dramatically from the land. Kakadu National Park, located three hours from Darwin, offers a wild and wondrous experience with its monsoon rainforests, sandstone escarpments, and abundant wildlife. The Ikara-Flinders Ranges National Park, north of Adelaide, presents an otherworldly landscape where red earth meets granite mountains and tree-lined gorges.
The Daintree Rainforest, accessible from Cairns, is the oldest continually surviving rainforest in the world, offering a chance to explore its rich biodiversity and gain insights into the First Nations Kuku Yalanji culture. Cradle Mountain-Lake St Clair National Park in Tasmania showcases dramatic snow-capped ridges, glacial lakes, and grasslands teeming with unique wildlife. Wilsons Promontory Marine Park, located on the western point of Kangaroo Island, invites visitors to discover hidden beaches, rushing rivers, and heritage lighthouses, along with its famous rock formations.
These national parks in Australia, with their ancient gneiss formations and natural wonders, provide unforgettable experiences and a deeper connection to the region's geological and cultural heritage.
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Gneiss in construction
Gneiss is a metamorphic rock that is widely used in construction due to its strength, durability, and unique appearance. It is formed through the metamorphism of existing rocks under high pressure and temperature conditions, typically deep within the Earth's crust. This process gives gneiss its distinctive banding patterns, with alternating light and dark mineral layers.
In construction, gneiss is valued for its durability and resistance to weathering, making it ideal for outdoor applications. It is commonly used for walls, cladding, paving, and monuments. The stone's rough, non-slip surface and high tolerance to atmospheric effects and temperature fluctuations make it a preferred choice for outdoor settings.
Gneiss is also used for internal and external decoration, adding a unique and finished look to interiors and exteriors. It is often used for the lining of walls, floors, and fireplaces, as well as for creating decorative panels, unique details, and ornaments. The presence of mica particles in gneiss gives it a beautiful glimmer when exposed to sunlight.
Gneiss is available in a range of colours, including warm beige with golden nuances, light milky brown, silvery-grey, and enigmatic granite. It is also known for its hardness, comparable to granite, making it a popular choice for building materials such as foundations, paving stones, and countertops.
Gneiss can be found worldwide, with notable deposits in areas of tectonic activity such as mountain ranges like the Alps, the Himalayas, and the Rocky Mountains. In Australia, gneiss formations can be found in the Narryer Gneiss Terrane in Western Australia, which is one of the oldest geological complexes in the world.
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Gneissic banding
Gneiss is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. This rock is formed under pressures ranging from 2 to 15 kbar, sometimes even more, and temperatures over 300 °C (572 °F). Gneiss nearly always shows a banded texture characterized by alternating darker and lighter bands and without a distinct cleavage. The banding is usually due to the presence of differing proportions of minerals in the various bands. The darker bands have relatively more mafic minerals (those containing more magnesium and iron), while the lighter bands contain relatively more felsic minerals (minerals such as feldspar or quartz, which contain more of the lighter elements, such as aluminium, sodium, and potassium).
The banding is developed at high temperatures when the rock is more strongly compressed in one direction than in other directions (non-hydrostatic stress). The bands develop perpendicular to the direction of greatest compression, also called the shortening direction, as platy minerals are rotated or recrystallized into parallel layers. The mineral segregation that occurs during the metamorphic process results in gneissic banding. The gneissic banding is the result of mineral segregation during the metamorphic process. This rock typically consists of minerals like quartz, feldspar, and mica.
In Australia, the Narryer Gneiss terrane is a geological complex in Western Australia composed of a mixture of granite, mafic intrusions, and metasedimentary rocks. The Narryer Gneiss terrane has undergone many high-grade polyphase deformation events, with the most notable being at 2600 to 2700 Ma associated with granite-greenstone magmatism in the Yilgarn Craton. The Yilgarn Craton is one of the most famous gneiss formations in Western Australia.
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Gneiss domes
Gneiss is a common and highly distinctive metamorphic rock, recognised by its characteristic banding. It is formed through the metamorphism of existing rocks under extreme pressure and temperature, usually deep within the Earth's crust. This process can take millions of years, making gneiss one of the oldest rock types found on Earth. It is often compared to granite due to its similar composition, but differs in texture and structure, giving it a unique appearance.
Gneiss is found worldwide, but some of the most notable deposits are located in areas with a history of tectonic activity, such as mountain ranges. It can also be found in regions with ancient, stable continental crusts. Some of the most famous gneiss formations include the Lewisian Gneiss Complex in Scotland, the Yilgarn Craton in Western Australia, and the Narryer Gneiss Terrane in Western Australia. The Narryer Gneiss Terrane is a geological complex composed of a mixture of granite, mafic intrusions, and metasedimentary rocks that are over 3.3 billion years old.
The Rum Jungle gneiss dome in Northern Australia, for instance, is an area of significant geological interest. It is known for its uranium-copper deposits and has been the subject of multiple scientific studies. The gneiss in this region is part of the larger Rum Jungle Complex, which has intruded subparallel to bedding and is now strung out by shearing. This complex is interpreted as an early Archaean mafic to ultramafic layered intrusion, which has been partly disaggregated by tectonic activity and the intrusion of gneiss.
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Frequently asked questions
Gneiss is found in the Narryer Gneiss Terrane in Western Australia. The Narryer Gneiss Terrane is a geological complex composed of a mixture of granite, mafic intrusions, and metasedimentary rocks. It is one of the oldest known samples of the Earth's crust, with samples of zircon from the Jack Hills portion dated at 4.4 billion years old.
The Narryer Gneiss Terrane is composed of a mixture of granite, mafic intrusions, and metasedimentary rocks. It has undergone multiple metamorphic events, resulting in the destruction of original igneous or sedimentary textures.
The word "gneiss" is derived from the German word "Gneis," which is probably derived from the Middle High German noun "gneist," meaning "spark," as the rock glitters.
Gneiss is a coarse-grained metamorphic rock with a distinctive banding pattern. It is characterized by alternating light and dark mineral layers, giving it a unique appearance.
Gneiss forms through the metamorphism of existing rocks under extreme pressure and temperature, typically deep within the Earth's crust. This process can take millions of years, making gneiss one of the oldest rock types found on Earth.
