Exposures of arc crustal sections represent rare opportunities to directly evaluate lower magmatic processes and their link products in the middle upper crust. Within southernmost Sierra Nevada batholith, Bear Valley Intrusive Suite (BVIS) exposes a contemporaneously constructed ~ 30 km thick intrusive suite, thus is ideal for this type examination. Here we present detailed petrography mineral ...

ABSTRACT Most of the World's platinum-group element ore deposits occur as thin stratiform layers within layered intrusions. These generally contain disseminated base-metal sulfides or chromite. However, cryptic also without chromite in what are known low-S-high deposits. The origin these is not clearly understood. Luanga Complex hosts largest elements resource South America (i.e., 142 Mt at 1.2...

Abstract Mantle peridotites from three 3 × 3-meter grids sampled at kilometer distances one another in the ca. 497 Ma Leka Ophiolite Complex (LOC), Norway, are examined to investigate chemical and isotopic nature of oceanic mantle domains centimeter scale. The lithology each grid locality is predominantly harzburgite, but includes layers lenses dunite pyroxenite. Major lithophile trace element ...

Introduction: Currently, about 30% of the known Martian meteorites have been found in Antarctica, with some rare samples such as the orthopyroxenite AHL84001 amongst them [1]. We have previously shown [2, 3] that terrestrial weathering in hot and cold deserts can cause elemental fractionation of air incorporated into those meteorites, which complicates the quantification of the noble gas compon...

Carbonate globules in ALH84001 are associated with small olivine grains [1] – an unexpected finding because the olivines equilibrated at high T while the carbonate is chemically zoned and unequilibrated. A possible explanation comes from a terrestrial analog on Spitsbergen (Norway) [2], where some carbonate globules grew in cavities left by aqueous dissolution of olivine. For ALH84001, the same...

Introduction: Igneous and metamorphic rocks commonly contain a mineral assemblage that allows oxygen fugacity to be calculated or constrained such as FeTi oxides, olivine-opx-spinel, or some other oxybarometer [1]. Some rocks, however, contain a limited mineral assemblage and do not provide constraints on fO2 using mineral equilibria. Good examples of the latter are orthopyroxenites or dunites,...

The last few years have provided two noteworthy examples of misclassifications of achondritic meteorites because the samples were new kinds of meteorites from planetary rather than asteroidal parent bodies. Basaltic lunar meteorite EET87521 was misclassified as a eucrite [1,2] and SNC (martian) orthopyroxenite ALH84001 was misclassified as a diogenite [3]. (Here a planetary body is one that rem...

ALH84001 is the only martian meteorite currently known with a crystallization age of 4.5 Ga. This ancient age indicates the meteorite must come from the ancient crust of Mars, located primarily in the southern hemisphere of the planet. The 4.56 Ga crystallization age, the 16 Ma ejection, and theoretical models of how material is ejected off Mars were used to identify possible source craters for...