Download e-book for kindle: Precambrian Geology. The Dynamic Evolution of the by Alan M. Goodwin

By Alan M. Goodwin

ISBN-10: 0122898702

ISBN-13: 9780122898709

The most aim of this e-book is to supply a latest complete assertion at the Earth's Precambrian crust. It makes use of geographic and tectonic position, lithostratigraphy, geochronology, and petrogenesis as a foundation for contemplating Precambrian coastal evolution--including the function of plate tectonics. particular attention is given to the endogenic and exogenic procedures which shaped the continental crust and likewise to its next secular evolution throughout Precambrian time**An crucial reference quantity for each Precambrian geologist

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Additional info for Precambrian Geology. The Dynamic Evolution of the Continental Crust

Sample text

The —900 Ma old event is particularly widespread in East Antarctica. 8 Ga) juvenile crustal formation (Black et al 1987). Finally an —500 Ma greenschist metamorphic event has been reported from almost all the coastal areas in the Indian Ocean sector (0°-100Έ), as well as in the Transantarctic Mountains and Coats Land. It is locally manifested by granitoid intrusions but does not appear to have been accompanied by folding. It is coeval with the Ross Orogeny at 5 4 4 ± 4 M a (Black and Sheraton 1990) in the Transantarctic Mountains Fold Belt and the PanAfrican events in Africa.

0 Ga, marking the midlate Archean boundary. 0 Ga. 5 Ga. This was followed immediately by late granitoid plutonism and, locally, Great Dyke emplacement in the newly consolidated Kaapvaal-Limpopo-Zimbabwe composite. 7 Ga in equivalent positions along the western flanks of the Kaapvaal and Zimbabwe cratons respectively. 9 Ga metamorphic-plutonic event to form the Namaqua-Natal Belt and effectively consolidate the entire Kalahari Craton. 9 Ga) rift basins (Koras-Sinclair-Ghanzi), aligned along the western and northern margins of the Kalahari Craton, represent narrow, fault-bounded continental rift grabens, filled with immature continental red-bed and bimodal volcanic rocks.

It constitutes an elongated trapezoid almost 1200 km long (east to west) by 300-400 km across, or 360000 km 2 in area, making it by far the largest exposed craton in the platform. The shield or megablock is itself divided into five smaller domains by minor N-trending faults. The adjoining Stanovoy Fold Belt (Ridge) to the south is almost equivalent in size. The Aldan Shield is fault bounded on three sides: Nelkan Fault to the east, Zhoya Fault to the west and Stanovoy Fault to the south. The northern slope is formed of thin, gently northward dipping Riphean-Vendian platform cover upon the northward shelving Aldan Anteclise.

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Precambrian Geology. The Dynamic Evolution of the Continental Crust by Alan M. Goodwin

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