Mineralogical, geochemical and fluid inclusion studies reveal two favourable environments for the localisation of beryl mineralisations in the Precambrian rocks of Egypt: (1) emerald-schist; and (2) beryl-specialised granitoid associations. Emerald occurs within the mica schists and is typically confined to the Nugrus major shear zone. However, beryl associated with granitoids occurs in pegmati...

A gamma spectrometric analysis of rock samples collected from the Precambrian Oban Massif, southeastern Nigeria, was performed to determine some primordial radioelements’ activity concentrations: U-238, Th-232, and K-40, their associated radiological hazards. The mean radionuclides determined be 1073.06 ± 0.65, 160.74 1.32, 250.76 0.91 Bq·kg−1 for 40K, 238U, 232Th, respectively, showing that th...

sq02_080825_terms_e Synthetic Quartz Crystal: A single crystal grown using the hydrothermal synthesis method. As-Grown Quartz Crystal: A synthetic quartz crystal grown naturally with no processing. Lumbered Quartz Crystal: A synthetic quartz crystal with the X and Z surfaces processed according to specified dimensions and angles using a diamond wheel #80. Y-bar Synthetic Quartz Crystal: A synth...

We carried out geochemical and mineralogical analyses on fault-zone rocks from the Anko section of the Median Tectonic Line in Nagano Prefecture, Japan, to investigate coseismic physicochemical processes in the fault zone. The latest fault zone in the Anko section contains cataclasite, fault breccia, and fault gouge of granitic composition, and brecciated basic schist. Protoliths of the graniti...

the formation of atoll garnet in hornblende schists from the contact aureole of mashhad granite,ne iran, is discussed using textural and chemical data. these data suggest the possibility of incipientreplacement of pre-existing idioblastic garnet from the core. in addition, the presence of chlorite and calcite inthe core of atoll garnet reveal the retrograde nature of atoll formation.

Abstract This study describes mineralogical and crystallochemical characteristics of metamorphic tourmalines from an Alpine shear zone in a Variscan rock sequence the Maramures region northern part East Carpathians. We use this mineral to unravel aspects evolution tourmaline bearing host rocks compare crystallo-chemical other Alps. Petrographic microstructural observations, as well electron mic...

P-wave anisotropy is significant in the mylonitic Alpine Fault shear zone. Mineral- and texture-induced are dominant these rocks but further complicated by presence of fractures. Electron back-scattered diffraction synchrotron X-ray microtomography (micro-CT) data acquired on exhumed schist, protomylonite, mylonite, ultramylonite samples to quantify mineral phases, crystal preferred orientation...