When was the Yilgarn Craton?

The Yilgarn Craton was once blanketed by thick sheets of ice during the Permo-Carboniferous glaciation from about 320–280 million years ago. These glaciers ground down and flattened out the topography in large areas of the Yilgarn Craton.

What Archean rock type is most abundant across the Yilgarn Craton?

Greenstones are unevenly distributed across the craton but are most abundant in the eastern part (Fig. 13.1). Granite and granitic gneiss constitute at least 70% of Yilgarn Craton crust preserved at or near the surface.

What is Australia made of?

Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands.

How did the Yilgarn Craton form?

The Yilgarn Craton appears to have been assembled between ~2.94 and 2.63 Ga by the accretion of a multitude of formerly present blocks or terranes of existing continental crust, most of which formed between 3.2 Ga and 2.8 Ga.

How did the Kaapvaal Craton form?

The Kaapvaal Craton formed and stabilised between 3.7 and 2.6 Ga by the emplacement of major granitoid batholiths that thickened and stabilised the continental crust during the early stages of an arc-related magmatism and sedimentation cycle.

What was the first eon?

the Hadean
The first eon was the Hadean, starting with the formation of the Earth and lasting about 540 million years until the Archean eon, which is when the Earth had cooled enough for continents and the earliest known life to emerge.

What are cratons and Orogens?

The word craton was first proposed by the German geologist L. Kober in 1921 as “Kratogen,” referring to stable continental platforms, and “orogen” as a term for mountain or orogenic belts. Later authors shortened the former term to kraton and then to craton.

What brands are Australian owned?

Which household brands are still Australian owned?

Arnott’s. Key products: TimTam, Shapes, Jatz.
Bushells. Key products: Tea and coffee.
Uncle Tobys. Key products: Roll Ups, Cheerios, Le Snak, Oats.
Rosella. Key products: Tomato sauce, soup, chutney.

What was Australia called before?

Terra Australis
After British colonisation, the name New Holland was retained for several decades and the south polar continent continued to be called Terra Australis, sometimes shortened to Australia.

What are the Perth Hills called?

the Darling Ranges
The Perth hills sit to the east of the Perth city centre and overlook much of the Perth metropolitan area in the South West of Western Australia. The Perth Hills are elevated between 10 and 70 metres above the Perth coastal plain and is collectively known as the Darling Ranges.

Where is the Yilgarn Craton in Western Australia?

The Yilgarn Craton is bound on the western side by the Perth Basin, of Jurassic age, and is separated from this basin by the Darling Fault.

What is the geology of the western yigarn craton?

Geology of the western Yilgarn Craton and Leeuwin Complex, Western Australia — a field guide by S. A. Wilde1and D. R. Nelson2 Introduction The aim of this excursion is to examine the evolution of the western margin of Australia from the Archaean to the present-day (Frontispiece).

What was the history of the western Yilgarn?

Multiple mafic suites intruded the terrain during the Proterozoic, forming dyke swarms and sills. Geoscientific investigations have identified hydrous gabbroic rocks, boninites and sanukitoids across the terrane, indicating that subduction-like processes played an important role in the post-2.82 Ga history of the western Yilgarn Craton.

How old is the Yilgarn plateau in Australia?

The Yilgarn Block in Western Australia is one of the most ancient landscapes preserved anywhere on Earth. The Yilgarn Plateau is a craton, one of the original masses of rock that rose out of the sea in the Late Archaean, about 2700 ma to form the original landmass of Australia.

When was the Yilgarn Craton? The Yilgarn Craton was once blanketed by thick sheets of ice during the Permo-Carboniferous glaciation from about 320–280 million years ago. These glaciers ground down and flattened out the topography in large areas of the Yilgarn Craton. What Archean rock type is most abundant across the Yilgarn Craton? Greenstones are…