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Osmium rich Pt group element PGE alloys occur worldwide in association with chromite in ultramafic peridotite complexes It has been suggested that these Os rich alloys formed under extreme P T conditions in the lowermost mantle before the metallic core of the Earth formed or later in the outer core and have been transported to the upper mantle as xenoliths in deep
·The potential for in situ mineral carbonation in peridotite is emphasized in the following simple calculation There are ≈·10 15 kg of CO 2 in the atmosphere up from a preindustrial value of perhaps ·10 15 kg In Oman the Samail ophiolite —a thrust bounded slice of oceanic crust and upper mantle—is >350 km long and ≈40 km wide and it has an
·Formation of plagioclase bearing peridotite is attributed to the melt infiltration of residual peridotite and melt mantle interaction at shallow depth as a product of the reaction between
·This paper presents mineralogical and geochemical data on seafloor massive sulfides SMS from the Ashadze 1 hydrothermal field at the Mid Atlantic Ridge MAR The Ashadze 1 deposit is associated with the uplifted lower crust and upper mantle oceanic core complex OCC of the MAR segment characterized by asymmetric mode of accretion The
Extrapolation and extension of phase equilibria in the model system KAlSiO4 Mg2SiO4 SiO2 H2O suggests that at depths greater than 100 km deeper than amphibole stability hybridism between cool hydrous siliceous magma rising from subducted oceanic crust and the hotter overlying mantle peridotite produces a series of discrete masses composed largely of phlogopite
·The Balmuccia peridotite is a N S oriented lenticular body measuring km in length and km in width Figure 1 The peridotite body consists mainly of spinel lherzolite containing numerous pyroxenite layers Shervais 1979a; Shervais 1979b which range in thickness from about one to several tens of centimeters Rivalenti et al 1995
Peridotite is the ultimate source of all chromium ore and naturally occurring diamonds and of nearly all chrysotile asbestos It is one of the main host rocks of talc deposits and platinum metals and formerly was a major source of magnesite Fresh dunite is used in parts of glass furnaces Nearly all peridotite is more or less altered to serpentine and is cut by many irregular shear
·Serpentinized peridotite is reacting with groundwater in the subsurface of the Samail ophiolite in Oman Although these rocks are partially to completely serpentinized they interact with a groundwater aquifer containing hyperalkaline fluids rich in H 2 and CH the mechanisms by which H 2 production may continue at low temperatures <50°C are not fully
·To solve these issues and constrain the mantle oxidation state soon after core formation knowledge of Fe 2 disproportionation in mafic melts such as peridotite at lower mantle conditions >23
·Two types of melt pockets closed melt pocket CMP and open melt pocket OMP are recognized from the peridotite xenoliths entrained in the Cenozoic kamafugites in western Qinling Central China The Haoti CMPs have a mineral assemblage of olivine clinopyroxene amphibole K feldspar whereas the Baiguan CMPs are
·In all our experiments whether the peridotite is lherzolitic or harzburgitic in composition we consistently observe the formation of vein like structures of phlogopite wehrlite and
·Amphibole is a common hydrous mineral in mantle rocks To better understand processes leading to the formation of amphibole‐bearing peridotites and pyroxenites in the lithospheric mantle we conducted experiments by juxtaposing a lherzolite against hydrous basaltic melts in Au‐Pd capsules Two melts were examined a basaltic andesite and a basalt
·The dependence of starting materials and their initial grain sizes on the formation of gases H2 CH4 C2H6 and C3H8 during serpentinization was investigated by conducting hydrothermal
·Pyroxenites are diffuse in fertile mantle peridotites and considered an important component in the mantle source of oceanic basalts They are rarely documented in abyssal and ophiolitic peridotites representing residual mantle after melt generation and few studies defining their origin are to date available We present a field based microstructural and
·Sample capsules were prepared using two different methods namely reaction and mixed experiments For reaction experiments the capsules were prepared by packing together phyllite and dunite powders with 1 1 weight ratio as juxtaposed blocks metasediment on top of peridotite For mixed experiments phyllite and dunite powders were intimately mixed in
·The pressure of listvenite formation is poorly constrained with a possible range from GPa considering that they occur within the basal peridotite unit 33 and assuming 8 10 km ophiolite
·Petrogenesis and tectonic environments for formation of peridotites and associated podiform chromite ore southern part of Manipur Ophiolite Belt Indo Myanmar Orogenic Belt NE India
·The consequences of hydrous basaltic melts and peridotite interaction were examined experimentally in Au Pd Pt and graphite capsules using the reaction couple method
·The 134^130 Ma Han Xing diorite^monzodiorite complex intrudes the central part of the North China block NCB The high Mg diorites have intermediate SiO2 high MgO Cr and Ni contents elevated Mg numbers Mg# and are characterized by high Sr and Ba highly fractionated rare earth elements REE and strong Nb and Ta depletions These geochemical
·We performed an experimental study designed to reproduce the formation of an unusual merwinite olivine bearing mantle assemblage recently described as a part of a Ca rich suite of inclusions in sublithospheric diamonds through the interaction of peridotite with an alkali rich Ca carbonatite melt derived from deeply subducted oceanic crust In the first set of
·The consequences of hydrous basaltic melts and peridotite interaction were examined experimentally in Au Pd Pt and graphite capsules using the reaction couple method Reactions between a hydrous basaltic andesite 4 wt% H 2 O and dunite or lherzolite in an Au Pd capsule at 1 GPa and 1200 °C produce a melt bearing orthopyroxenite dunite sequence
·These results indicate a multistage tectonic overprint after peridotite carbonation and listvenite formation which may be related to the tectonic history of the deformed continental margin under the ophiolite These relatively late brittle structures should be excluded when trying to understand the carbonation of peridotite to listvenite
