| 翻訳と辞書 |
| Tonalite-Trondhjemite-Granodiorite ： ウィキペディア英語版 |
Tonalite-Trondhjemite-Granodiorite
Tonalite–trondhjemite–granodiorite (TTG) series are an aggregation of rocks that are formed by melting of hydrous mafic crust at high pressure. It is widely accepted that most Archaean granite–greenstones are dominated by TTG, although Late Archaean terranes, such as in the Yilgarn Craton, are dominated by potassium-rich granitoid rocks that are derived through remelting of older felsic TTG-dominated crust. According to this model, a much greater degree of crustal reworking has occurred in the Pilbara craton than is required by TTG-dominated crust.
The origin of TTG suites is debated; their chemistry is similar to modern-day subduction zone magmas, but there is disagreement as to whether modern plate tectonic processes operated during the Archaean.〔McCall, G. J. H. (2003). ''A critique of the analogy between Archaean and Phanerozoic tectonics based on regional mapping of the Mesozoic-Cenozoic plate convergent zone in the Makran, Iran.'' Precambrian Research 127: 5-17〕 Some authors have suggested alternative styles of subduction, while others attribute the development of TTG to direct melting of the lithosphere by mantle plumes.〔(Rapp, Robert P. (1999) ''First Origins of Archean Continental Crust: Assessing Experimentally the Roles of Mafic Versus Ultramafic Sources.'' Dept. of Geosciences, State University of New York )〕
==References==
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「Tonalite-Trondhjemite-Granodiorite」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|