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Río de la Plata craton : ウィキペディア英語版
Río de la Plata Craton


The Río de la Plata Craton is one of the five cratons (ancient nuclei) of the South American continent. The other four cratons are: Amazonian, São Francisco, Río Apa and Arequipa–Antofalla.
It crops out in southern Uruguay and parts of Argentina. Crystalline rocks of the Río de la Plata Craton are dated between 2200 and 1700 million years ago, such as rocks in Uruguay which are dated at 1790 ±5 Ma. Dikes trending ENE in the same area are dated by argon-argon dating at 1727 ±10 Ma. The craton has a size of about 20,000 square kilometres.
== Notes ==

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抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Río de la Plata Craton」の詳細全文を読む



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