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| Ponce, Alexis D.; Bertotto, Gustavo W.; Zanetti, Alberto; Brunelli, Daniele; Giovanardi, Tommaso; Aragon, Eugenio; Bernardi, Mauro I.; Hemond, Christophe; Mazzucchelli, Maurizio. |
| Cenozoic basalts carrying ultramafic mantle xenoliths occur in the Matilde, Leon and Chenque hills in the Paso de Indios region, Argentina. The mantle xenoliths from the Chenque and Leon hills mainly present porphyroclastic textures, whereas the Matilde hill xenoliths have coarse-grained to porphyroclastic textures. The equilibrium temperatures are in the range of 780 to 940 degrees C, indicating a provenance from shallow sectors of the lithospheric mantle column that were subjected to a relatively low heat flux at Cenozoic Era. According to the modal compositions of xenoliths, the mantle beneath Matilde and Leon hills was affected by greater than 22% partial melting, while less depleted peridotites occur in the Chenque suite (starting from 10% partial... |
| Tipo: Text |
Palavras-chave: Mantle xenoliths; Alkaline basalts; Paso de Indios; Patagonia. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00639/75150/75503.pdf |
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