Le dôme du Lévézou (Rouergue, France) fait-il partie d'un vaste astroblème d'âge Stéphanien ?
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- 作者：Vincent ; Pierre M.
- 关键词：astrobleme ; tectonics ; impact mechanics ; French Massif Central ; Vredefort Dome ; South Africa ; France ; astroblè ; me ; tectonique ; mé ; canisme d'impact ; Massif central ; dô ; me de Vredefort ; Afrique du Sud ; France
- 刊名：Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science
- 出版年：2001
- 出版时间：March 15, 2001
- 年：2001
- 卷：332
- 期：5
- 页码：331-338
- 全文大小：412 K
文摘
The Lévézou Dome (LD) is made of a migmatitic gneissic core surrounded by a ‘basic belt’. The belt is upturned, vertical to the west, and overturned to the north. This deformation postdates tangential movements and peak metamorphism. It implies a late vertical uplift and radial compression, presently without satisfactory explanations. The LD has striking analogies with the Vredefort Dome, a giant astrobleme including an external depression (The Witwatersrand Basin). The discontinuous Stephanian basins encircling the LD sensu lato remind of an external depression, suggesting that it is also the central part of an astrobleme, ca 50 km wide.