Petrographic and geochemical evidence for multiphase formation of carbonates in the Martian orthopyroxenite Allan Hills 84001

Carbonates in the Martian meteorite Allan Hills 84001 formed at 18 4 °C in a near-surface aqueous environment

Despite evidence for liquid water at the surface of Mars during the Noachian epoch, the temperature of early aqueous environments has been impossible to establish, raising questions of whether the surface of Mars was ever warmer than today. We address this problem by determining the precipitation temperature of secondary carbonate minerals preserved in the oldest known sample of Mars’ crust—the...

Origin of supposedly biogenic magnetite in the Martian meteorite Allan Hills 84001.

Crystals of magnetite (Fe(3)O(4)) and periclase (MgO) in Fe-Mg-Ca carbonate in the Martian meteorite Allan Hills 84001 were studied by using transmission electron microscopy to understand their origin and evaluate claims that the magnetites were made by Martian microorganisms. In magnesian carbonate, periclase occurs as aggregates of crystals (grain size approximately equal to 3 nm) that are pr...

TRACE ELEMENT AND εNd SYSTEMATICS IN THE NAKHLITE MIL 03346 AND THE ORTHOPYROXENITE ALH 84001: IMPLICATIONS FOR THE MARTIAN MANTLE

Introduction: MIL 03346 is a newly discovered clinopyroxenite belonging to the nakhlite class of SNC (martian) meteorites [1]. Although the petrographic and geochemical characteristics of MIL 03346 are broadly similar to those of previously known nakhlites, there are also some differences. In particular, it has the highest abundance of glassy mesostasis among the nakhlites, possibly indicative ...

simulation and experimental studies for prediction mineral scale formation in oil field during mixing of injection and formation water

abstract: mineral scaling in oil and gas production equipment is one of the most important problem that occurs while water injection and it has been recognized to be a major operational problem. the incompatibility between injected and formation waters may result in inorganic scale precipitation in the equipment and reservoir and then reduction of oil production rate and water injection rate. ...

BIOGENIC OR ABIOGENIC ORIGIN OF CARBONATE-MAGNETITE-SULFIDE ASSEMBLAGES IN MARTIAN METEORITE ALLAN HILLS 84001. E. R. D. Scott, Hawai’i Institute of Geophysics and Planetol-