[1] The geochemical differences between individual Hawaiian shields provide clues to the magma source components in the Hawaiian plume. Lavas from Koolau (Makapuu-stage) and Kahoolawe volcanoes define the enriched, i.e., relatively high Sr/Sr and low Nd/Nd, extreme for Hawaiian shield lavas. There are, however, important geochemical differences between these shields; Kahoolawe lavas lack the re...

The paper concerns the geochemical analysis of rocks from ore-bearing layered intrusions that belong to two age groups Monchepluton and Imandra–Umbarechka Complex (2.50 2.44 Ga) largest gabbro-anorthosite Main Ridge (2.51–2.45 Ga). intrusion these complexes happened at different depths when endogenous geodynamic settings changed beginning Paleoproterozoic Era. Five megacycles are distinguished ...

Massif-type mafic intrusions (gabbro and anorthosite) are known for their considerable resources of vanadium-bearing iron–titanium oxide ores. Massive-type gabbroic anorthosite rocks frequently associated with magmatic that have significant quantities iron, titanium, vanadium. The most promising host Fe-Ti ores the in south-eastern desert. ilmenite ore deposits hosted arc rocks. They classified...

Understanding the physics of earthquake slip helps to improve seismic hazard predictions. The occurrence of quenched frictional melts along exhumed fault zones (pseudotachylytes) provides unequivocal evidence of ancient seismic slip along these faults [Sibson, 1975]. In order to better understand the evolution of friction (the ratio of shear stress over normal stress) during meltgenerating slip...

Abstract Reconstructed whole-rock (RWR) and mineral major- trace-element compositions, as well new oxygen isotope data, for 22 mantle eclogite xenoliths from the Catoca pipe (Kasai Craton) were used to constrain their genesis evolution. On basis of mineralogical major-element eclogites can be divided into three groups: high-alumina (high-Al) (kyanite-bearing), low-magnesian (low-Mg#), high-magn...