 | | Journal (article/letter/editorial) | | 73-83 Talc-rich hydrothermal rocks from the St. Paul and Conrad fracture zones in the Atlantic Ocean MASSIMO...R., I-40129 Bologna, Italy 2Istituto Abstract: Talc-rich rocks covered by Fe-Mn coatings were recovered... Paul F.Z. (00°37’S-25°34’W, equatorial Atlantic) and Conrad F.Z. (55°29’S-02°05’W, American-Antarctic...American-Antarctic Ridge). In both occurrences, the talc-rich rocks are associated with serpentinized peridotites, gabbroic...consisting of angular clasts of botryoidal/colloform talc in a subordinate foraminiferal ooze sediment. These |  | | Journal (article/letter/editorial) | | 7 ~16' E) between the Islas Orcadas and Shaka Fracture Zones. The cumulus nature of the gabbroic rocks...direct knowledge of the plutonie portion of the ocean crust, despite is volumetric importance. Most of...Indian Ridge is one of the slowest spreading major ocean ridges in the world. It has been mapped and dredged...ridge segment between the Islas Orcadas and Shaka Fracture Zones, showing tracks of dredge hauls (station...present day ridge axis is located within the broad zone that is deeper than 3500 m 1976; Sclater et al |  | | Report (chapter) | | Abyssal peridotites, very slow spreading ridges and ocean ridge magmatism H. J. B. Dick Geological Society...Abyssal peridotites, very slow spreading ridges and ocean ridge magmatism H. J. B. Dick SUMMARY: The SW Indian...spreading ocean ridges (less than 1 cm a-l), making them the low end-members for rate of ocean ridge magma...crustal structure, with anomalously thin crust near fracture zones that may consist of only a thin veneer of...is little evidence for magma chambers at these fracture zones, it is concluded that melts formed in the |  | McDonald, I., de Wit, M.J., Smith, C.B., Bizzi, L.A., Viljoen, K.S. (1995) The geochemistry of the platinum-group elements in Brazilian and southern African kimberlites. Geochimica et Cosmochimica Acta, 59 (14) 2883-2903 doi:10.1016/0016-7037(95)00183-2 | Journal (article/letter/editorial) | | 35 Ga, during which a significant volume of n&w talc-alkaline lithosphere was created (Moore et al.,...is coupled to an external Neoproterozoic erogenic zone (the lJrua@ Belt). The latter comprises metasediments...greater than komatiites and ocean island basalts (OIB) but are lower than mid-ocean ridge basalts (MORB), siliceous...asthenosphere (Le Roux, 1987), or in the Transition Zone (Ringwood et al., 1992), the initial melting process...mantle heterogeneity from PGE abundances in Indian Ocean basalts. Con. J. Earth Sci. 29,2329-2340. Garuiti |  | | Book | | onto the (201) plane defined by the [010] and [102] zone axes using the oblique axis a for projection. Each...to the (201) plane defined by the [010] and [102] zone axes, and lies at an angle of about 100° to the...scattering by a "soft-mode" model with a condensing zone-boundary phonon, for which the Ca atoms mainly drive...congestion 0 vector migrates nearly in the [923] zone from the normal to the (10j) plane at An 25 _30...that the splitting vector is close to the [923] zone. This specimen has the longest reported fringe spacing |
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