The metapelitic rocks of the Sikkim Himalayas show an inverted metamorphic sequence (IMS) of the complete Barrovian zones from chlorite to sillimanite + K-feldspar, with the higher grade rocks appearing at progressively higher structural levels. Within the IMS, four groups of major planar structures, S1, S2 and S3 were recognised. The S2 structures are pervasive throughout the Barrovian sequenc...

the protoliths of metamorphosed argillaceous rocks from the garmichay area in the east azerbaijan province of nw iran were clay-rich sediments of reworked nature, originating most likely from an andesite to andesite-basalt source and deposited in an active continental margin tectonic setting. the protoliths of the garmichay metapelites experienced low to moderate chemical weathering. andalusite...

Major and trace element composition of silicate melt inclusions (SMI) their rock-forming minerals were studied in mafic garnet granulite xenoliths from the Bakony–Balaton Highland Volcanic Field (Western-Hungary). Primary SMIs occur clinopyroxene plagioclase plagioclase-rich domains granulites ilmenite vicinity these wall rock. Based on major elements, we demonstrated that have no connection wi...

Landslide movements and soil loss due to erosion have increased dramatically, causing numerous human economic losses. Therefore, it is necessary delimit these risks in order prevent mitigate the effects natural parks of great value, as case Arribes del Duero Natural Park. As for landslide movements, they are evaluated by estimating susceptibility their occurrence, taking into account different ...

The origins of Cenozoic granites in the Himalaya are key to understanding evolution Himalayan orogen. However, it is unclear whether these represent primary melts, and nature their magma source controversial. Here, we present a systematic element Sr–Nd–B–Mo isotope study from Yardoi area eastern Tethyan Himalaya, China. These can be divided into two groups: mid-Eocene porphyritic two-mica with ...

Abstract Inclusions of relic high-pressure melts provide crucial information on the fate crustal rocks in deep roots orogens during collision and thickening, including at extreme temperature conditions exceeding 1000 °C. However, discoveries melt inclusions are still a relative rarity among case studies metamorphic minerals. Here we present results experimental microchemical investigations nano...

Abstract. The coexistence of chloritoid and biotite in medium-pressure Barrovian terranes is quite uncommon, the parameters controlling their equilibrium relations are still controversial. Various studies have already investigated influence pressure (P), temperature (T), bulk rock (X bulk) fluid fluid) compositions on stability this assemblage. Here we apply forward thermodynamic modelling amph...

The Ojén nappe, an allochthonous unit that underlies the Ronda peridotites (Betic Cordilleras), is composed of Triassic marbles overlying a metapelitic sequence. In order to carry out LA-ICP-MS U-Pb age determination and provenance analysis, detrital zircon grains from two quartzites interlayered within metapelites were extracted. obtained results yield youngest population 254 ± 3 Ma (Late Perm...

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...