■ Abstract The bulk of the ∼50-km-thick Martian crust formed at ∼4.5 Gyr B.P., perhaps from a magma ocean. This crust is probably a basaltic andesite or andesite and is enriched in incompatible and heat-producing elements. Later additions of denser basalt to the crust were volumetrically minor, but resurfaced significant portions of the Northern hemisphere. A significant fraction of the total t...

[1] Using a time series of TerraSAR-X spaceborne radar images we have measured the pulsatory motion of an andesite lava flow over a 14-month period at Bagana Volcano, Papua New Guinea. Between October 2010 and December 2011, lava flowed continuously down the western flank of the volcano forming a 3 km-long blocky lava flow with a channel, levees, overflows and branches. We captured four success...

Introduction – Lunar meteorite Northwest Africa (NWA) 032 is an unbrecciated mare basalt, discovered in 1999, whose modal mineralogy is characterized by phenocrystic olivine, pyroxene and chromite, with a groundmass containing feldspar, pyroxene, ilmenite, troilite and other trace metals [1]. Shock melt occurs in veins throughout the sample as well. Fagan et al. [1] observed that the major elem...

The title compound, dicalcium nonaoxidodistannate(IV)dialuminate, is the second example which crystallizes in the isotypic structure of a pyroxene silicate, Na(2)Ti(2)Si(2)O(9) (ramsayite). (∞) (1)[Sn(2)O(8)] chains and pyroxene-type (∞) (1)[Al(2)O(6)] chains are formed along the b axis by sharing O atoms. The Ca atoms are situated in the resulting channels and exhibit a coordination number of 7.

Abstract. Interaction between peridotite and pyroxenite-derived melts can significantly modify the mineralogy chemistry of upper mantle, enhancing its heterogeneity, by creating re-fertilized peridotites secondary-type pyroxenites. We experimentally investigated reaction a fertile lherzolite MgO-rich basaltic andesite produced partial melting an olivine-free pyroxenite at 2 GPa 1300–1450 ∘C. Th...

Acid weathering of plagioclase–pyroxene mixtures has been investigated with an open system kinetic dissolution model. The modeling reveals that elevated plagioclase/pyroxene ratios observed in some low-albedo martian regions and atmospheric dust could be partially caused by preferential dissolution of pyroxenes at pHs below ∼3–4. Surface materials with smaller grain sizes, affected by lower pH ...