Archean Quartzose Rocks at Akilia, Greenland Fedo and Whitehouse (1) presented data to support their hypothesis that granulite grade quartz magnetite rocks on the island of Akilia, southwest Greenland—which are conformably interposed with pyroxenite and hornblendite units that date from before 3830 million years ago (Ma) (2–4)—had a metasomatic ultramafic igneous origin. They offered that inter...

Abstract A plausible origin of the seismically observed mid-lithospheric discontinuity (MLD) in subcontinental lithosphere is mantle metasomatism. The metasomatized likely to stabilize hydrous phases such as amphiboles. existing electrical conductivity data on amphiboles vary significantly. hornblendite much higher than that tremolite. Thus, if truly represents amphibole varieties MLD regions, ...

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 Two suites of amphibole-rich mafic–ultramafic rocks associated with the voluminous intermediate to felsic in Early Cretaceous Laiyuan intrusive–volcanic complex (North China Craton) are studied here by detailed petrography, mineral and melt inclusion chemistry, thermobarometry demonstrate an situ reaction-replacement origin hornblendites. Moreover, a large set compiled newly obtained g...

introduction: parent materials as one of the main soil formation factors have a great impact on the concentration of heavy metals in the soil. heavy metals are released to the soil during weathering and pedogenic processes. ultrabasic rocks are known as the potential natural source of heavy metals, especially ni, cr and mn in the soil. average concentrations of ni and cr in the soils are 84 and...