To quantitatively convert upper mantle seismic wave speeds measured into temperature, density, composition, and corresponding uncertainty, we introduce the Whole-rock Interpretative Seismic Toolbox For Ultramafic Lithologies (WISTFUL). WISTFUL is underpinned by a database of 4,485 ultramafic whole-rock compositions, their calculated mineral modes, elastic moduli, over range pressure (P) tempera...

Abstract Micrometer sized stromatolitic structures called Frutexites are features observed in samples from the deep subsurface, and hot-spring environments. These comprised of fine laminations, columnar morphology, commonly consist iron oxides, manganese and/or carbonates. Although a biological origin is invoked, few reports have shown direct evidence their association with microbial activity. ...

The petrology and geochemistry of serpentinized harzburgites within the Feather River Ophiolite in northern California were investigated to constrain the origin of serpentinization. Trace-element systematics indicate that serpentinization was associated almost solely with relatively low temperature hydrothermal addition of seawater and not with the addition of metamorphic fluids associated with...

s and Publications: Johnson, N. C., Thomas B. Maher, K., Bird, D. K., Rosenbauer, R. Brown, G. E. Jr. (2011) Adsorption of organic ligands on silicate mineral surfaces in the presence of CO2 and water: Insight into olivine dissolution rates. Goldschmidt Conference, Prague, Czech Republic. Johnson N. C., Thomas B., Maher K., Bird D. K., Rosenbauer R. J., Brown G. E. Jr. (2011) Kinetics of olivin...

Abu Hamamid (AH) Neoproterozoic (Sm/Nd model age of 770 ± 20 Ma) mafic–ultramafic intrusion lies along a NE–SW fracture zone in the Shadli Metavolcanic Belt, south Eastern Desert, Egypt. AH intrusion is concentrically zoned with cumulate clinopyroxenebearing dunite core mantled by olivine clinopyroxenite, hornblende clinopyroxenite and hornblende gabbroic rim. The observed crystallization seque...