Chromite chemistry in SNC meteorites

Chemistry and Valency Spectra of Chromite in Snc Meteorites:

Fractionation among Large-ion Lithophile Elements during the Differentiation of Mars: Implications for the Composition of the Martian

Introduction: The ratios between moderately volatile large ion lithophile (LIL) elements, such as K and Rb, and refractory LIL elements, such as Th, U, and the LREE are very important constraints on models for the origin and chemical composition of the primitive mantles of planets [e.g., Ref. 1]. Ratios among these highly incompatible elements are generally thought to change little during magma...

Seeing through the dust: martian crustal heterogeneity and links to the SNC meteorites.

Through the application of new analytical techniques to high spatial resolution imaging spectrometer data, the ferrous mineralogy of major volcanic terrains on Mars is shown to consist of significant fractions of both low- and high-calcium pyroxene. Changes in the relative abundances of these pyroxenes are observed for units of different age and morphology, even in regions with higher degrees o...

Fossil Meteorites of Sweden: What Are Their Cosmic-ray Exposure Ages?

Introduction: More than 80 L-chondritic fossil meteorites were found in Middle Ordovician limestone in the Thorsberg quarry at Kinnekulle in southern Sweden [1, 2]. All meteorite-bearing sediment beds at Thorsberg contain sediment-dispersed extraterrestrial chromite (SEC) grains of L chondrite composition [3]. Similar SEC grains were also found in several correlated sediment beds of other quarr...

The Effect of Flourine on the Liquidus of an Adirondack-class Martian

Introduction: This study presents first experimental results on the effect of fluorine on near-liquidus phase equilibria of an Adirondack-class Martian basalt. The basis of this study is our previous work on anhydrous [1] and chlorine bearing [2] systems which has already shown that: 1) the Adirondack-class basalts are evolved liquid compositions [1] and 2) that chlorine has a large effect on l...