Sclavia Craton
TheSclavia Cratonis a lateArcheansupercratonthought to be parental to theSlaveandWyoming CratonsinNorth America,theDharwar Cratonin southern India, and theZimbabwe Cratoninsouthern Africa.Sclavia was proposed byBleeker 2003who estimated the number of Archean cratons to be about 35; cratonic fragments which he suggested were derived from a single or a few supercratons.[1]
The break-up of Sclavia, and possibly other continents or supercratons, can be linked to a global pulse ofmagmaticactivity around 2.33–2.1Gyaprobably caused by increasedmantle plumeactivity. Related results of this mantle activity include the 2.3Ga-oldPrecambriandyke swarmsin theDharwar Cratonin southern India which were emplaced in only five million years. Similar swarms have been found in what is today Antarctica, Australia, Finland, Greenland, and North America.[2]
There is growing evidences that support that the Slave and Dharwar cratons shared a common history through the Archean but the exact configuration of the Archean supercraton from which they were derived is unknown.[3]
Kenorland,a proposed supercontinent, is a "one-piece" alternative to three separate supercratons:Superia,Vaalbara,and Sclavia.[4]
References
[edit]- Notes
- ^Bleeker 2003,Abstract
- ^French & Heaman 2010,Abstract
- ^French & Heaman 2010,Testing the existence of the supercraton Sclavia, pp. 436–438
- ^Ernst 2007;Lubnina & Slabunov 2011
- Sources
- Bleeker, W. (2003). "The Late Archaean Record, a Puzzle in ca. 35 Pieces".Lithos.71(2): 99–134.Bibcode:2003Litho..71...99B.doi:10.1016/j.lithos.2003.07.003.
- Ernst, R. E. (2007).Global record of large igneous provinces [LIPs] and its use in paleocontinental reconstructions.GSA Denver Annual Meeting.Retrieved14 May2016.
- French, J. E.; Heaman, L. M. (2010)."Precise U–Pb dating of Paleoproterozoic mafic dyke swarms of the Dharwar craton, India: implications for the existence of the Neoarchean supercraton Sclavia".Precambrian Research.183(3): 416–441.Bibcode:2010PreR..183..416F.doi:10.1016/j.precamres.2010.05.003.Retrieved14 May2016.
- Lubnina, N.; Slabunov, A. (2011).Neoarchean supercontinent Kenorland: paleomagnetic and geologic evidence(PDF).Geophysical Research Abstracts. Vol. 13.Retrieved14 May2016.
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