The Novo Cruzeiro pegmatite field in Minas Gerais (Brazil), located between Téofilo Otoni and the Jequitinhonha River, belongs to areas of EBPP with tourmaline emerald occurrences. pegmatites show beside coloured tourmalines, Cr-rich black cogenetic Cr-bearing emerald. General crystallization conditions show, based on obtained data, important changes during final phase crystallisation which cau...

U-Pb dating of zircon was undertaken with the Beijing SHRIMP II (sensitive high resolution ion microprobe) on anamphibolite facies granodiorite and an almandine-albite granulite from the Santa Maria Chico Granulitic Complex, southern Brazilian Shield. This work was also done to unravel protolith ages which are often hidden in the array of partly reset data. The obtained metamorphic ages of the ...

Freezing thawing cycles are known to play an important role in fracture propagation on rock mass and thus slope instabilities. In laboratories, this phenomenon can be studied through the measurement of velocities elastic waves. Seven types rocks differing by their mineralogy texture were tested (gneiss, basalt, amphibolite, dolomite, sandstone, marble limestone calcite). Five samples each teste...

Zircons from charnockitoids of the Tashlyk complex Pryinhul syncline were studied and dated in order to determine their chronostratigraphic position. two age generations identified, namely Early Archean (ca. 3 Ga) Proterozoic (2.0±0.1 Ga). The presence former generation indicates that protolith for charnockites have been represented by rocks older than Spasove Series, which is considered be age...

The Susong metamorphic complex (SSC) in the southern margin of Dabie orogenic belt (DOB) central-eastern China is a key unit for understanding subduction and exhumation processes DOB. However, formation age grade SSC remain uncertain, hampering our mechanism An integrated study field survey, regional petrology, geothermobarometry, U–Pb dating zircon was carried out this study. Our results revea...