Abstract. We report on Precambrian microfossils from igneous rocks of the Volyn pegmatite district, associated with Paleoproterozoic Korosten pluton, northwestern Ukraine. The fossils were recovered meter-sized miarolitic cavities and show a well-preserved 3D morphology, mostly filamentous but large variety types also in irregular, flaky shapes reminiscent former biofilms, as well rare spherica...

Tourmaline can be found as an accessory mineral in a variety of rocks including leucogranite, pegmatite, quartz veins, and metamorphiccountry rocks in Hajiabad-Dehgah area in SE of Boroujerd city. Tourmaline in pegmatites is coarse-grained, subhedral to euhedral, anddisplays strong to moderate pleochroic blue rimmed by olive green. In contrast, tourmalines from leucogranite, quartz-veins, and h...

Abstract The chemical composition (including B, Be and Li), the Raman spectrum crystal-structure evolution (at temperature range 27–1000°C) of a Mn-bearing, Bi-rich gadolinite-subgroup mineral from Jaguaraçu Pegmatite, Brazil (type-locality minasgeraisite-(Y)) was studied. Elemental mapping revealed that crystal investigated has complex zonation with various Bi (~8–24 wt.% 2 O 3 ), Ca (~8–10 Ca...

The field work, backscattered electron images and detailed microanalyses of three generations tourmaline from the Namacotche LCT pegmatites allows de distinction between compositional magmatic hydrothermal tourmalines. generation 1 occurs in outer intermediate zone pegmatite. It consists zoned crystals with an oscillatory inner core foitite schorl, schorl Fe-rich fluor-elbaite rim. Unzoned occu...

Quartz from 254 pegmatites representing eight pegmatite fields and provinces worldwide was investigated by laser-ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS) to determine concentrations of trace elements Al, Ti, Li, Ge, B, Be, Rb, Na, K, Ca, P, Ga, Sb, Zn U. A total 271 new analyses combined with 535 published LA-ICP-MS quartz chemistry data were evaluated binary ternary el...

The Ilmeno-Vishnevogorsky miaskite-phenite-carbonatite complex (IVС), located in the Urals folded region, is a representative of "linear type" carbonatite complexes, with which Nb-Zr deposits are associated. ore potential linear time and duration ore-forming processes, geodynamic setting remain subject discussion. In order to estimate age formation processes IVC, U-Pb dating zircon (LA-ICP-MS) ...