Abstract Plagioclase hosted needle- and lath-shaped magnetite micro-inclusions from oceanic gabbro dredged at the mid-Atlantic ridge 13° 01–02? N, 44° 52? W were investigated to constrain their formation pathway. Their genesis is discussed in light of petrography, mineral chemistry, new data transmission electron microscopy (TEM). The show systematic crystallographic shape orientation relations...

Much of the literature that analyzes the effect of various factors on basaltic weathering rates does not assess the synergistic effects of several factors at once. Those studies that do address such synergies generally report their results in formats that are difficult to integrate into geographic analysis. The research outlined in this paper employs multivariate statistics to assess the effect...

In this study the formation of polygenetic High Tatra granitoid magma is discussed. Felsic and mafic mixing mingling processes occurred in all batches composing pluton are documented by typical textural assemblages, which include: microgranular enclaves (MME), clots, felsic quartz-plagioclase-titanite ocelli, biotite-quartz poikilitic plagioclase crystals, chemically zoned K-feldspar phenocryst...

Introduction: Asteroidal fragments in lunar breccias and soils are critical to an understanding of the nature of the major impactors of the Moon. Observing FeNi metal is typically the simplest way for identifying asteroidal fragments. Schreibersite [(Fe,Ni) 3 P] in FeNi metal is a clear indicator of asteroidal contamination , although this was validated only after the realization that schreiber...

Results reported by Ohtake et al. [1] are stunning and potentially have great petrologic significance. Using the Kaguya multiband imager and spectral mixing procedures, the team investigated " crater central peaks, walls, ejecta and basin rings, " that is, outcrops of rock where there is little regolith. They observed numerous locations in the highlands where " anorthosite composed of nearly 10...

geothermobarometry equations are based on thermodynamic principles and appear in single or multi-variant functions. the number of variants for a specific composition or reaction usually is reduced into 2 involving temperature (t) and pressure (p). since most of planned equations have two passive or variant p and t, using these equations should be with special care. it is very effective to use g...

Petrology and Mineral Compositions: The fresh, pale gray interior of this specimen has multiple shock fractures (with very minor calcite coatings) and some thin glass veinlets (Figure 2). This rock is a poikiloblastic recrystallized breccia, with larger grains of plagioclase (~70%) enclosing much smaller grains (less than 100 microns across) of pyroxene (~20%), olivine (~10%) and accessory Ti-c...