4 edition of Early Proterozoic red beds on the Kaapvaal craton found in the catalog.
Early Proterozoic red beds on the Kaapvaal craton
J. F. Truswell
|Statement||by J.F. Truswell.|
|Series||Information circular / Economic Geology Research Unit ;, no. 223, Information circular (University of the Witwatersrand. Economic Geology Research Unit) ;, no. 223.|
|LC Classifications||QE325 .J6 no. 223, QE471 .J6 no. 223|
|The Physical Object|
|Pagination||iii, 96 p. :|
|Number of Pages||96|
|LC Control Number||91148445|
Pilbara Craton: | | ||| | Australia map. Pilbara Region is coloured in red. World Heritage Encyclopedia, the aggregation of the largest online encyclopedias available, and the . The Archaean Geology of the Kaapvaal Craton Southern Africa Book Summary: This book provides a comprehensive overview of the evolution of one of the oldest and best-exposed Archaean cratons on this planet. There is currently a renewed interest in the early Earth, and the Kaapvaal craton has long served as a model for early crustal evolution.
Abstract. The rocks along the southwestern margin of the Kaapvaal Craton were deformed up to 7 times during the Early to Middle Proterozoic. The oldest deformation D1 is recorded in the N-S-trending Uitkoms cataclasite of pre-Makganyene age (> Ga) on the craton, and interpreted as a Author: Wladyslaw Altermann and Ingo W. Hälbich. 1. Introduction  The Kaapvaal craton in southern Africa contains an extraordinary and well preserved Neoarchean to Paleoproterozoic geological record, including some of the oldest examples of red soils and sediments that indicate an oxidizing atmosphere and terrestrial biosphere on Earth [Gutzmer and Beukes, ].In the Griqualand West area of the Northern Cape Province, the earliest red Cited by:
Iron-Formation: Facts and Problems. Dimroth dolomite Early Proterozoic Econ environment Ewers and Morris ferruginous fold Fortescue Group Geol geology goethite Gole grade greenalite Griquatown grunerite Gunflint Iron Hamersley Basin Hamersley Group hematite iron-formation iron-rich jaspilite Kaapvaal craton Klein Kuruman Labrador Trough. Evidence for the existence of life during the Archaean segment of Earth history (more than Myr ago) is summarized. Data are presented for 48 Archaean deposits reported to contain biogenic stromatolites, for 14 such units reported to contain 40 morphotypes of putative microfossils, and for 13 especially ancient, – Myr old geologic units for which available organic geochemical Cited by:
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Early Proterozoic red beds on the Kaapvaal craton (Information circular / Economic Geology Research Unit) [J. F Truswell] on *FREE* shipping on qualifying offers. The Kaapvaal Craton covers an area of approximately 1, km 2 (, sq mi) and is joined to the Zimbabwe Craton to the north by the Limpopo 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.
Buy Early Proterozoic red beds on the Kaapvaal craton (Information circular / Economic Geology Research Unit) by J. F Truswell (ISBN: ) from Amazon's Book Store. Everyday low prices and free delivery on eligible : J.
F Truswell. Late Archean metamorphism joined the Southern Marginal Zone of the Kaapvaal Craton to the Northern Marginal Zone of the Zimbabwe Craton approximately – Ga by the kilometres ( mi) wide orogenic Limpopo Belt.
The belt is an east-northeast trending zone of granulite facies tectonites that separates the granitoid-greenstone terranes of the Kaapvaal and Zimbabwe cratons. This is the last known placer deposit before the onset of red beds on the Kaapvaal Craton. Although the oxidation state of the contemporaneous atmosphere plays a crucial role in the mineralogy of the detrital minerals associated with the gold, it does not control the distribution of detrital gold particles as evidenced by the Fe-oxide bearing auriferous conglomerates of the Tarkwa Basin.
The Neoarchean to Paleoproterozoic (ca. – Ga) Transvaal Supergroup of the Kaapvaal Craton is dominated by clastic and chemical sedimentary rocks, with few strata-bound igneous units. Evidence for the transition to an oxygen-rich atmosphere during the evolution of red beds in the Lower Proterozoic sequences of southern Africa.
Precambrian Res., Strata > to ~Cited by: 2) Archean and Proterozoic pelites from the Kaapvaal Craton are very distinct in Cr/Th ratios, but they have overlapping and large ranges of Eu/Eu* ratios (Condie and Wronkie- wicz, ).
This is not consistent with the idea that post- Archean cratonic terrains have uniform REE patterns with rather constant Eu depletion (McLennan and Taylor Cited by: Late Proterozoic-age Mozambique Metamorphic Province (Fig. The Zimbabwe Craton forms part of the Kalahari Craton which also includes the Archaean-age Kaapvaal Craton and Limpopo Metamorphic Province.
These entities stabilised far earlier than the central, northeastern and northwestern African cratons that stabilised during the.
Analysis of silicate rocks from the Archaean Kaapvaal craton is used to obtain palaeodirections and intensities of the Earth's magnetic field some billion years ago, and finds that the field Cited by: continental red beds Download continental red beds or read online books in PDF, EPUB, Tuebl, and Mobi Format.
Click Download or Read Online button to get continental red beds book now. This site is like a library, Use search box in the widget to get ebook that you want. The Late Archaean-Early Proterozoic Transvaal Sequence is preserved within the Transvaal, Kanye and Griqualand West basins, with the Ma Bushveld Complex intrusive into the upper portion of the succession within the Transvaal basin.
Both Transvaal and Bushveld rocks are extensively mineralized, the former containing large deposits of iron, manganese, asbestos, Cited by: The Palaeoproterozoic Hartley Formation in the Olifantshoek Group was deposited in one of the rift-related Waterberg (sensu lato) red bed basins which formed on the Kaapvaal Craton after the Precambrian of the Southern Hemisphere domains dykes Early Proterozoic east eastern emplacement facies faults felsic fold belt Geol Geology Geosyncline gneisses granites granitoid granulite greenstone belts Group Halls Creek Hamersley igneous Inlier intrusion iron formations iron-formation isotopic Kaapvaal craton lavas layered lower mafic.
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The Archaean–Palaeoproterozoic 'Transvaal Supergroup' on the Kaapvaal craton in South Africa is, however, exceptionally well preserved, and is Cited by: early-Proterozoic Olifantshoek red beds (Stowe, ; Beukes and Smit, ).
It is thus highly un- likely that the iron-formations of the Transvaal Se- quence were deposited in linear foreland basins sire- ilar to those that may characterize the deposition of granular iron-formation units of the Canadian Shield according to Hoffman ().File Size: 1MB.
Master S () Early Proterozoic assembly of “Ubendia” (Equatorial and Southern Africa and adjacent parts of South America): tectonic and metallogenic implications.
In: Dia A (eds) Symposium on the Early Proterozoic: geochemical and structural constraints, Metallogeny. CIFEG Occ. Publ., 23, Dakar, pp – Google ScholarCited by: 3. The Proterozoic Eon extended from mya to mya (million years ago), and is the most recent part of the Precambrian "supereon." The Proterozoic is the longest eon of the Earth's geologic time scale and it is subdivided into three geologic eras (from oldest to youngest): the Paleoproterozoic, Mesoproterozoic, and Neoproterozoic.
Africa - Africa - Geologic history: The African continent essentially consists of five ancient Precambrian cratons—Kaapvaal, Zimbabwe, Tanzania, Congo, and West African—that were formed between about and 2 billion years ago and that basically have been tectonically stable since that time; those cratons are bounded by younger fold belts formed between 2 billion and million years ago.
Greenstone belts are zones of variably metamorphosed mafic to ultramafic volcanic sequences with associated sedimentary rocks that occur within Archaean and Proterozoic cratons between granite and gneiss bodies. The name comes from the green hue imparted by the colour of the metamorphic minerals within the mafic rocks: the typical green minerals are chlorite, actinolite, and other green.Supporting Information Fischer et al.
/pnas Geological Context The Late Archean Transvaal Supergroup occurs across much of the Kaapvaal Craton, broadly divided into Griqualand West and Transvaal structural subbasins (Fig.
S1). The succession is re-markably well preserved and largely undeformed across much of the craton.Author by: Alfred Kröner Languange: en Publisher by: Springer Format Available: PDF, ePub, Mobi Total Read: 27 Total Download: File Size: 48,5 Mb Description: This book provides a comprehensive overview of the evolution of one of the oldest and best-exposed Archaean cratons on this is currently a renewed interest in the early Earth, and the Kaapvaal craton has long.