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South Precambrian platform
1. South Precambrian platform
BY OLEKSANDER PROKOPENKO2.
3. South American Platform
oStable continental crust of S. America not affected by Cenozoic
tectonics and orogenies
Basically everything east of the Andes and south of the Caribbean
o
Consists of Archean and older Proterozoic nuclei surrounded by
younger Proterozoic orogenic belts
o
Exposed in 4 places:
Guyana Shield
Guaporé Shield
Sao Francisco Craton
Rio de la Plata Craton
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6. Guyana shield
Location : It underlies the three Guianas-Guyana, Surinam andFrench Guiana- and parts of Venezuela, Columbia and Brazil.
Archean: three comparatively small Archean nuclei
The tectonically overthrust Imataca Complex in the north
The poorly defined Pakairama Craton in the centre – west
The Xingu Craton(northern segment) in the southeast
Early Proterozoic: rocks consisting of the metavolcanic Pastora
Supergroup and the granitic plutonic Supamo Complex. (2.2-1.8Ga)
Mind Proterozoic: rocks consists of continental clastic sedimentary
rocks. These Precambrian sediments include quartz sandstones,
quartzites, and conglomerates presumed (1.7-1.4Ga).
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9. Stratigraphy
10. Platform magmatism
In Amazon, Parnaiba, San Francisco, Paraná,Chaco Basin , powerful strata of plateaubasalts and interplanetary intrusions of the
main composition and other breeds of the
formation of the Jurassic-Cretaceous
formation were discovered. This formation is
especially developed in the Paraná Basin,
where the Serra-Gerral series depth to 1.8 km
11. Tectonic
12. Minerals
First place in the world:Iron ore
Cuprum
Beryllium
Lithium
Niobium
Second place in the world:
Titanium
Tin
Molybdenum
Antimony
Bauxite
Tantalum
Apatite
Others:
Manganese
Gold
Phosphorite
Diamonds
13. Resources
1.Engler A. The Geology of South America // Encyclopedia of Life Support Systems. – Vol. IV.
Geology
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B. De Vivo, B. Grasemann, K. Stüwe (Eds.). - EOLOSS Publishers / Unesko, 2009.
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Guidoa D.M. The basement of the Deseado Massif at Bahıa Laura, Patagonia / D.M. Guidoa,
M.P. Escayola, I.B. Schalamuka // Journal of South American Earth Sciences. - 2004. Hildebrand,
R.S. et al. On the allochthonous nature of auriferous greenstones, Guayana shield, Venezuela
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// Gondwana Research. – 2014. - http://dx.doi.org/10.1016/j.gr.2013.09.011.
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https://www.cambridge.org/core/journals/netherlands-journal-ofgeosciences/article/paleoproterozoic-evolution-of-the-guiana-shield-in-suriname-a-revisedmodel/90A2153483F9A6A875E7201339ECF944/core-reader
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https://en.wikipedia.org/wiki/Guiana_Shield
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Alan M. Goodwin // Precambrian Geology: The Dynamic Evolution of the Continental Crust1991.
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Geologic Setting and Evolution of Latin America
http://www.utdallas.edu/~pujana/latin/PDFS/Lecture5%20Geologic%20setting%20and%20evolution%20of%20LA.pdf
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Parnaiba Basin https://www.researchgate.net/figure/Paleozoic-stratigraphic-column-of-theParnaiba-Basin-Modified-from-Vaz-et-al-2007_fig8_321706108