Amphibolite facies conditions in the oceanic crust: example of amphibolitized flaser-gabbro and amphibolites from the Chenaillet ophiolite massif (Hautes Alpes, France)
Amphibolite facies conditions in the oceanic crust: example of amphibolitized flaser-gabbro and amphibolites from the Chenaillet ophiolite massif (Hautes Alpes, France)
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DOI：
10.1016/0012-821x(78)90146-2
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发表时间：
1978-03
影响因子：
5.3
通讯作者：
C. Mével;R. Caby;J. Kienast
中科院分区：
文献类型：
--
作者：
C. Mével;R. Caby;J. Kienast
Petrological and mineralogical data on amphibolitized gabbros from an Alpine ophiolite massif (Chenaillet Massif, France) are presented. Comparison with metagabbros dredged from the ocean floor shows that synkinematic amphibolite facies conditions may be reached in gabbros after their initial crystallization in the vicinity of the ridge. It is suggested that sub-horizontal plastic flow took place in the gabbroic layer near the axis of a slowly spreading ocean ridge before the intrusion of diabase dykes. This thermo-tectonic regime which at the Chenaillet produced flaser-gabbros and layers of foliated amphibolites with brown hornblende and pargasite, probably also affected most of the other ophiolitic gabbros of the Piemont zone prior to the low-temperature/high-pressure Alpine metamorphism.
