|
|
| Hekinian, Roger; Thompson, Geoffrey. |
| New chemical analyses and a review of published data show that there is a compositional diversity between volcanics of basaltic composition found in the M.A.R. rift valley, M.A.R. transform faults and aseismic ridges. The basaltic rocks from, the M.A.R. transform faults are less mafic (depleted in olivine content) than those from the M.A.R. rift valley. The transform fault basalts have a higher range of TiO2 content (1-4%), of Fe2O3 + FeO content (8-14%) and a lower range of Cr content (50-500 ppm) and Ni content (50-300 ppm). The volcanics from aseismic ridges around the world are considered to be the more felsic types of the two provinces. They have a higher range of variation for their TiO2, and Fe203 + Fe0 (1.6-5% ; 9-15% ; respectively) and a lower... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1976 |
URL: http://archimer.ifremer.fr/doc/1976/publication-5011.pdf |
| |
