We present new Sr-Nd-Hf isotopic data on mid-ocean ridge basalts from two segments (OH-1, OH-3) between the Oceanographer and Hayes fracture zones at Mid-Atlantic Ridge 33–35°N to constrain nature origin of upper mantle heterogeneity beneath Ridge. Together with major trace elements (Niu et al., 2001), illustrate that sources these lavas comprise three components, i.e., a depleted high radiogen...

Trieloff et al. (1) provided neon isotope data to argue that mantle neon originates as a trapped component in meteorites rather than having a pristine solar composition. That finding, if true, has important consequences for understanding the mechanism of volatile input into the mantle, because it rules out models involving direct incorporation of solar gases. The main argument that Trieloff et ...

Abstract Basalts and basaltic rocks are the most abundant igneous on earth their petrologic geochemical studies have formed our knowledge base thermal structure composition of mantle with which we developed workable models chemical differentiation earth. All this would not been possible without innovative painstaking experimental petrology peridotite melting, magma generation evolution largely ...

"Lithosphere" is a mechanical concept implying strength and relative permanence. Unfortunately, the term has also been applied to the surface thermal boundary layer (TBL) and a shallow enriched geochemical reservoir, features having nothing to do with strength. The "strong" lithosphere is about one half the thickness of the TBL. The bottom of the elastic plate, the maximum depths of midplate an...

the nain and ashin ophiolites are located in northeastern isfahan province, in western central-east iranian microplate. pillow lavas are one of the most significant cretaceous rock units. the lower partial melting degree in mantle peridotites of ashin ophiolite, and the derived melt by melting their clinopyroxene caused a more basic (basalt) and enriched nature for the ashin pillow lavas, where...