Abstract The Iberian Pyrite Belt is a world-class metallogenic district developed at the Devonian-Carboniferous boundary Variscides that currently has seven active mines: Neves Corvo (Cu-Zn-Sn) and Aljustrel (Cu-Zn) in Portugal, Riotinto (Cu), Las Cruces Aguas Teñidas (Cu-Zn-Pb), Sotiel-Coronada La Magdalena (Cu-Zn-Pb) Spain. massive sulfide ores are usually hosted lower sections of volcano-sed...

Abstract The Greater Caucasus mountains (Cavcasioni) mark the northern margin of Arabia–Eurasia collision zone. Magmatism in central part began Pleistocene, up to ~25 Myr after initial collision. This paper presents bulk-rock and Sr–Nd–Pb isotope geochemistry from 39 Quaternary volcanic rock samples (<450 Ka) recovered Mt. Kazbek (Kasbegui) region Caucasus, Georgia, assess sources magmat...

Recent (<5 Ma) Hawaiian volcanoes define two sub-parallel spatial trends, Loa and Kea. Despite the short distance ( 30 km) between adjacent volcanoes on these trends, most of the Loa-trend shield lavas are geochemically distinct from most of the Kea-trend shield lavas. These geochemical differences arise from small amounts of the LOA component in the source of Loa-trend shield lavas. This compo...

Copyright © 2011 by The Geochemical Society of Japan. roughly the same since the Miocene (Bouquillon et al., 1990; France-Lanord et al., 1993). The sources are dominated by contributions from the Higher Himalaya (HH) with subordinate supply from the Lesser Himalaya (LH). However, on millennial timescale, there are evidences of variations in the provenance of sediments related to climatic change...

The Man Craton in West Africa hosts two clusters of highly micaceous kimberlites at Koidu and Tonguma with mineralogical geochemical features transitional towards those cratonic lamproites. To develop a better understanding the genesis these peculiar rocks, which have also been documented elsewhere (e.g., South Africa, China, Russia, India), we undertaken isotopic study representative fresh sam...

Neodymium strontium manganese oxide with ideal composition Nd(0.5)Sr(0.5)MnO(3) was reported to have two different structure models. In one model, the x coordinate of an O atom is at x > 1/2, while in the other model the x-coordinate of this atom is at x < 1/2. Difference-density maps around this O atom obtained from the current redetermination clearly show that the structure with the O atom at...

Abstract The Pyroxenite Marker, a thin, orthopyroxene-dominated marker horizon, is observed towards the top of Main Zone Bushveld Complex, where last voluminous influx magma into Complex thought to have occurred. In an attempt constrain Nd-isotopic composition added at level total 21 whole-rock samples from borehole (BH7771) drilled on Central Sector Eastern Limb were analysed for their Sr–Nd i...