BARBERTON GREENSTONE BELT PDF

Some features of this site are not compatible with your browser. Install Opera Mini to better experience this site. At the time of publication, it represented the best available science. Later examinations of the area revealed that the rocks date back some 3. The bare rocks of mountain peaks appear as a pale gray-green, accentuated by the sharp relief of sunlit slopes and their shadows.

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The Barberton Greenstone Belt The Barberton Greenstone Belt A number of projects are being undertaken in the Barberton Mountain Land with a view to understanding the nature and evolution of this classic Archaean granite-greenstone terrane. Included in this ongoing quest to ascertain more about the region as a whole are studies relating to the following topics: 1.

An evaluation of the petrology, geochemistry and mineralization potential of ultramafic complexes associated with Onverwacht Group metavolcanic successions; 2. The geological, geochemical, structural and age relationships of the TTG granitoid plutons surrounding the Barberton greenstone belt; 3.

An evaluation of the metamorphic history of selected areas of the Barberton greenstone belt and greenstone remnants in the adjacent granitic terrane including the Schapenburg Schist Belt and greenstone remnants surrounding the Boesmanskop syenite pluton in the Komati River Valley ; 4. The geological setting, mineralogy and geochemistry of Cu-Ni mineralization in the Nelshoogte Schist Belt, southwestern Barberton greenstone belt; 5. The petrology and geochemistry of the Sterkspruit gabbro intrusion in the Nelshoogte Schist Belt, southwestern Barberton greenstone belt; 6.

An investigation into the nature and evolution of migmatites and banded gneisses associated with TTG granitoid intrusions and Archaean greenstone remnants; 7. A project aimed at environmental conservation and protection of selected areas of geological, archaeological, botanical and wildlife significance, with a view to promoting the Barberton Mountain Land as worthy of recognition as a World Heritage Site; 8.

A study involving a petrogenetic re-evaluation of the wide range of compositionally variable granitoid rocks in the area which vary in age from c. The compilation and production of a number of books relating to the history and geology of the Barberton Mountain Land, including also a comprehensive field guidebook to the geology of the region.

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Barberton Greenstone Belt

To the south and west, the Kaapvaal Craton is flanked by Proterozoic orogens , and to the east by the Lebombo monocline that contains Jurassic igneous rocks associated with the break-up of Gondwana. The craton is a mixture of early Archean 3. Subsequent evolution of the Kaapvaal Craton 3. This was then followed by episodic extension and rifting when the Gaborone—Kanye and Ventersdorp sequences were developed.

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Makhonjwa Mountains

Barberton Geology Greenstone Belts occur as belts of deformed volcanic and sedimentary strata and get their name from the presence of green minerals Actinolite, amphiboles,Chromium muscovite "fuchsite", epidote, green chlorite and serpentine These ancient rocks are among the oldest in the World. The Barberton Greenstone belt is one of the oldest and best exposed Archaean greenstone belts on Earth and is almost 3. It is known world wide in geological circles as a treasure house of other significant geological phenomenae. These ancient rocks are 3. If you were able to travel back in time to visit Earth during the Archaean period you would not recognize it as the same planet we inhabit today. The first forms of life appeared on Earth during the early Archaean period.

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Greenstone belt

Read our FREE outlook report on gold investing! Give me my free report! Abitibi greenstone belt, Canada The Abitibi greenstone belt AGB is approximately 2, million years old and spans the Ontario- Quebec border, with close to one third on the belt in Ontario and the remaining two-thirds in Quebec. The majority of the richest deposits in the AGB can be found along two major shear zones: the Porcupine Destor Deformation zone and the Cadillac-Larder Lake Deformation zone, with the first gold discovery taking place in at the present-day Holt-McDermott asset. AGB is home to a variety of other major mines as well, producing well over million ounces of gold to date. Exploration is still underway in the area today and will most likely be discovered through the use of modern geophysical and geochemical techniques developed in order to see through the thick glacial sediments which covers the surface of the AGB. Yilgaron also encompasses the bulk of the Western Australian land mass and is one of the distinct physiographic provinces of the West Australian Shield physiographic division, which includes the Stirling-Mount Barren Block, Darling Hills, and Recherche Shelf sections.

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Kaapvaal Craton

Major rock types found within the BGB are mafic to ultramafic volcanics, sedimentary , and shallow intrusive rocks covered by a thin sedimentary veneer. The deeper-level intrusive pluton units dome up under the greenstone belt and are divided into two major groups: the TTG group, tonalite-trondhjemite-granodiorite which consists of plagioclase dominant feldspar minerals and the GMS group granite - monzonite - syenite , in which alkali feldspars are the dominant mineral composition. Following the formation of the thick volcanic layers was cyclic deposition of volcanic and sedimentary rocks. Then intrusions of plutonic TTG bodies began the formation of dome-and-keel structures. The volcanic layers deformed into synclines and the dome like TTG bodies created anticlines which is represented in the BGB today. Thin interbedded sedimentary units that have silicified into impure chert mark breaks that have resulted from eruptive activity.

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