Étude gravimétrique de la ceinture archéenne de roches vertes de Kuhmo (Finlande orientale) |
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| Authors: | Mohammed Jaffal Jean-Pierre Lefort Azzouz Kchikach |
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| Institution: | 1. Université Cadi-Ayyad, faculté des sciences et techniques, BP 549, Marrakech, Maroc;2. Géosciences Rennes, université de Rennes-1, campus de Beaulieu 35042 Rennes cedex, France |
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| Abstract: | The Kuhmo greenstone belt (Eastern Finland) is mainly formed by mafic volcanic rocks and metasediments. Although the geological observations indicate that this belt appears as a supracrustal synform overlying a gneissic basement, its deep structures are actually unknown. The present gravity study intends to provide a better understanding of these structures. Interpretation of gravity anomalies of the Kuhmo belt, using two-dimensional modelling suggests that the structures of the belt are controlled by granitoids diapirs. Most of the calculated models show that the belt displays in section pocket-like shapes (purses) terminated by a gully-shape close to the surface. This particular geometry corroborates the hypothesis of a gravitational formation with the heavy volcanic material sinking in a light sialic crust. To cite this article: M. Jaffal et al., C. R. Geoscience 335 (2003). |
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| Keywords: | gravimétrie ceinture de roches vertes Kuhmo Archéen modélisation gravity greenstone belt Kuhmo Archean modelling |
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