Relevance. When mapping the vast areas of Precambrian polymetamorphic complexes in North Yenisei Ridge, there is a problem metamorphism interpretation and phasing geological development particular area along with thrust tectonics. The solution these issues also great importance for purposes delineation metamorphic rocks that are favorable detection high-alumina (andalusite, kyanite, sillimanite...

The Western Domain of the Magallanes Fold-and-Thrust Belt (MFTB) between 52°-54°S is part a poorly studied hinterland region southernmost Andean Cordillera. This domain consists NNW-SSE trending tectonic slices pre-Jurassic basement units and Upper Jurassic-Lower Cretaceous ophiolitic complexes volcano-sedimentary successions Rocas Verdes Basin (RVB). New detrital zircon U–Pb ages metatuffs met...

Semi-pelitic rocks ranging in grade from the prehnite–pumpellyite to the greenschist facies from southeastern Otago, New Zealand, have been investigated in order to evaluate the reactions leading to formation and breakdown of stilpnomelane. Detrital grains of mica and chlorite along with fine-grained authigenic illite and chlorite occur in lower-grade rocks with compactional fabric parallel to ...

The geographic distribution of elevated groundwater As concentrations in a fractured silicate bedrock aquifer in central New Hampshire correlates with the presence of pegmatites which border late Devonian granites and intrude metasedimentary rocks. As concentrations in the pegmatites averaged 9.6 mg/kg, which is much higher than the associated granites (0.24 mg/kg) and metasedimentary rocks (0....

Ediacaran syn-tectonic plutonic rocks (amphibole gabbros, quartz diorites/tonalites to biotite- and muscovite-bearing granites) of the Angra Fria Magmatic Complex (Kaoko Belt, north-western Namibia) belong two compositionally similar, magnesian, transitional tholeiitic–calc-alkaline suites, Older (∼625–620 Ma) Younger (∼585–575 Ma). Both have counterparts in broadly contemporaneous Florianópoli...