OCCURRENCE OF ECLOGITES IN THE MACLAS SYNFORM - EXTENSION OF THE UPPER GNEISSIC UNIT IN THE EASTERN FRENCH MASSIF-CENTRAL

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作者
GARDIEN, V
LARDEAUX, JM
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O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
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07 ; 0710 ; 09 ;
摘要
Eclogites associated with serpentinites occur in the metamorphic series of Maclas (eastern French Massif Central). Relict phases allow calculation of eclogitic conditions around 700-770-degrees-C for minimal pressures of 16 to 14kbar. They underwent a retromorphic evolution from granulite facies metamorphism (13-10kbar, 750-830-degrees-C) to amphibolite and greenschist facies metamorphism (P < 5kbar, T < 400-degrees-C), similar to that of the ecologites from the Lyonnais area. These results demonstrate that the Maclas series belong to the high pressure upper allochton and imply the extension of this nappe south of the Pilat unit.
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页码:61 / 68
页数:8
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