Li behaviour and distribution in the mantle were investigated by ion microprobe in situ measurements on co-existing olivine (ol), orthopyroxene (opx), clinopyroxene (cpx) and amphibole (amp) in xenoliths from the French Massif Central. The fertile spinel lherzolites of this study record increasing degrees of mantle metasomatism, from unmetasomatised anhydrous samples through cryptically metasom...

soil salinity affects ions concentrationss of plant tissues and this may alter the merits quality of medicinal plants. experiments were conducted during 2003 at the the isfahan university of technology campus, isfahan, iran, to assess the effects of five soil salinity levels (3.2, 3.6, 4.5, 5.4 and 7.5 ds m-1) on na, k, and ca contents of borage and echium. each plant species was studied in a s...

a solution culture experiment was conducted to evaluate the salinity tolerance of 15 tomato genotypes in hoagland’s nutrient solution with three levels of nacl (0, 75, and 150 mm). the experiment was conducted in completely randomized design with three replicates. after 30 days of imposition of salt stress, gas exchange parameters including transpiration rate, stomatal conductance, co2 assimila...

the paper is focused on the formation of hydroxyapatite nanoparticles (hap) in polyelectrolyte-modified microemulsions, in a microemulsion template phase consisting of cyclohexane, water, cationic surfactant and cosurfactant, in the presence of na-polyacrylate (paa) as an anionic polyelectrolyte. it is shown that paa, can be incorporated into the individual inverse microemulsion droplets. the m...

Chromium isotope compositions have been determined for 42 mantle-derived xenoliths from Cameroon, France, Mongolia, Russia and the USA. The samples are mainly spinel garnet lherzolites, or harzburgites, yield ?53CrNIST979 ?0.33 to 0.43‰, within range of previously reported compositions, ?0.51 0.74‰ (Xia et al., 2017). Partial melting has proposed as a process that alters ?53Cr mantle residue. N...

The origin of the Proterozoic Choghart iron oxide deposit in the Bafq mining district of Central Iran has been the subject of a long-standing dispute. Some authors believe that it was formed from magma, while others suggest metasomatic replacement of preexisting rocks. The present study on the basis of new oxygen isotope, REE and geochemical data concludes that neither of these two hypotheses c...

Fluid-rock interaction in ultramafic rocks considerably affects the chemical and isotopic composition of oceanic lithosphere. We present a geochemical petrological study serpentinites ophicalcites Northern Apennine ophiolite, Italy. This ophiolite sequence represents fragments Jurassic lithosphere that have been denuded by low angle detachment faults, exposing peridotites on ocean floor trigger...

The present bulk-rock geochemical study aims to answer some questions concerning the distribution and variability of trace elements (TEs) rare earth (REEs) in lower Cambrian–Lower Cretaceous sandstones mudstones NE Gondwana Jordan. proved that REE TE patterns both detrital authigenic, light heavy minerals are controlled principally by source-rock provenance, followed an interplay many factors: ...