... elongation; cores range from isotropic to microgranular. Optical and chemical determinations indicate harzburgite (75% olivine and 25% pyroxene) as the protolith for Elba serpentinites, with characteristics similar to mantle peridotites from ocean basins. Microstructural analysis, led by transmission...

... textures and bastites characterize the Elba, Monti Livornesi and Murlo (Central Italy) retrograde serpentinites. These rocks, formed by hydration of harzburgitic peridotites, were sampled and analyzed to find further evidence for the origin of serpentinization fluids. Based on chemical and mineralogical...

...F igure 1. Geological sketch showing the four main serpentinitic outcrops (A–D) within the Monte Capanne contact aureole in Western Elba; crossed area corresponds to the granodioritic intrusion. The inset shows serpentinitic outcrops (black) in both Western and Eastern Elba. ...

.... The holotype material was discovered within a lamprophyre dike that cross-cuts tourmaline-rich metapelites within the exocontact of the O’Grady Batholith, Northwest Territories (Canada). Two additional samples were found at San Piero in Campo, Elba Island, Tuscany (Italy) in hydrothermal veins embedded in meta...

... and thermal analyses) have been reported for pure antigorite from veins in the Elba serpentinites ( Viti & Mellini, 1996 ); furthermore, the polysomatic modulation of vein antigorites was compared with that obtained for matrix antigorites ( Mellini et al. , 1987 ; Uehara & Shirozu, 1985...

...) is from a pale-green, splintery vein occurring in a massive serpentinite from Elba Island, Italy [sample ATG18; Viti and Mellini (1996) ]. The sample predominantly consists of antigorite lamellae with an average composition of Mg 2.62 Fe 2+ 0.16 Fe 3+ 0.03 Al 0.01 Si 2 (normalized to 2 apfu...

... Elba ( Viti & Mellini, 1996 ). Similarly, m values between 12 and 16 have been reported for oceanic serpentinites from the Mid-Atlantic Ridge, for which a formation temperature < 300 °C was estimated based on oxygen isotope data ( Ribeiro da Costa et al. , 2008 ); in that case, the low m...

...-temperature form of retrograde serpentine minerals. References Anselmi , B. , Mellini , M. , Viti , C. ( 2000 ): Chlorine in the Elba, Monti Livornesi and Murlo serpentinites: evidence for seawater interaction . Eur: J. Mineral ., 12 , 137 – 146 . Awad , A. , Van Groos...

... of abiogenic methane by serpentinization of peridotite. Methane in modern serpentinite-derived fluids in both the deep-sea and in ophiolite environments has negative δ 13 C values (−11.9 ‰ at Lost City, −10.3 ‰ at Logatchev, −16.7 ‰ at Rainbow, −18 ‰ at Elba and −7.7 ‰ in the Zambales ophiolite; Abrajano et...

... of well-constrained samples with known structures, micro/nanostructures, and compositions. Antigorite samples (ATG2, ATG7, and ATG18) correspond to pale-green, splintery veins in massive serpentinites from Elba Island, Italy ( Viti and Mellini 1996 ). Vein antigorites occur as elongated crystals, ranging...

.... Sands from ophiolitic sequences and remnant-ocean sediments ("subduction-complex provenance") are characterized by common cellular serpentinite with few chert grains, basaltic to diabase and gabbroic grains, and by abundant shale to slate lithic grains, respectively. Dense mineral suites are dominated...

... are acknowledged for their constructive reviews of the manuscript. References Anselmi , B. , Mellini , M. and Viti , C. ( 2000 ) Chlorine in the Elba, Monti Livornesi and Murlo serpentinites: evidence for sea-water interaction . European Journal of Mineralogy , 12 , 137 – 146...

... diffraction (see Table 1 , and next paragraph). The crystals of lizardite show Fe 2+ /(Fe 2+ + Mg) values varying from 0.04 [Pompeano (3)] to 0.12 [S. Scolastica (1)]. In agreement with the hypothesis of a Fe-bearing metasomatic fluid affecting the serpentinite outcrop of S. Scolastica ( Capedri & Lugli...

... antigorite, with an average of 0.83. In two olivine-bearing rocks, antigorite has Fe 3+ /∑Fe ratios of 0.13 and 0.15, which corresponds to wt% Fe 2 O 3 = 0.47 and 0.54, respectively. Larger amounts of Fe 2 O 3 occur in some, but not all, vein antigorites. The prograde formation of antigorite in serpentinite...

...Carlo Aurisicchio; Aida M. Conte; Caterina De Vito; Luisa Ottolini Abstract Crystals of beryl from miarolitic pockets, hosted in pegmatitic dikes on the Island of Elba, in Italy, were analyzed for the major and minor elements, including the light elements, by EMPA and SIMS techniques. Back...