Elemental abundance and isotopic fractionation profiles across zoned minerals from a martian meteorite (Shergotty) lunar olivine-normative mare basalt (Apollo 15555) were used to place constraints on the thermal evolution of their host rocks. The measurements determine extent which diffusion was responsible for, or modified, zoning. key concept is that mineral zoning result diffusion, significa...

introduction the study area is located 12km away from the north east of sarbisheh at the eastern border of the lut block (karimpour et al., 2011; richards et al., 2012). the magmatic activity in the lut blockhas begun in the middle jurassic (165-162 ma) and reached its peak in the tertiary age (jung et al., 1983; karimpour et al., 2011). volcanic and subvolcanic rocks in the tertiary age cover ...

Unraveling a planet's geologic evolution requires knowing what happened and when it happened. Two recent studies of the ages of Martian meteorites illuminate the early and late stages of Martian crust formation. One, by Munir Humayun (Florida State University) and colleagues in Australia and France studied Martian meteorite NWA 7533, an impact melt breccia composed of alkali-rich basalt similar...

Abstract We performed a series of experiments at 1 atm pressure and temperatures 1300–1500 °C to determine the effect oxygen fugacity on oxidation state Fe in synthetic martian basalt. Ferricferrous ratios were determined quenched glasses using Mössbauer spectroscopy. Following conventional doublet assignments spectrum, we obtain Fe3+/ΣFe value 0.19 1450 an corresponding QFM buffer. If apply Be...

The petrological features of scoria samples and enclosed holocrystalline xenoliths from the last ~1000 years activity La Soufrière volcano St. Vincent (Lesser Antilles) are described in detail here. products investigated prehistoric eruptions (pre-1440, 1440, 1580 CE) relatively homogeneous basaltic andesites (with a paragenesis consisting plagioclase, clinopyroxene, orthopyroxene opaques) comm...