Abstract Deformation in shear zones is difficult to date because mylonites can preserve partially reset pre-existing isotopic signatures. However, be key structural elements terrane recognition, so an accurate estimation of their age important. Here we determine the situ Rb–Sr composition mica from major NE-SW trending mylonitic Archean Akia Terrane Greenland and complement this information wit...

Abstract The paper considers the relationship between textural and structural features gross mineral chemical composition of minerals physical properties apatite-nepheline ores their processing. It is noted that change in involves primarily due to apatite depletion. An increase content nepheline pyroxene 35-55 % sharply increases ore strength up 47-104 MPa, which entails growth energy consumpti...

An exotic block of garnet-bearing schist has been found at the boundary between Early Triassic Takinosawa Unit Nedamo Belt and Jurassic Nakatsugawa Complex North Kitakami Belt, NE Japan. This is only second discovery schists in Belt; previously identified occur early Carboniferous Tsunatori units Belt. The characterized by a mineral assemblage garnet + phengite epidote albite quartz titanite. P...

Ruby (red corundum) is one of the most prominent colored gemstones in world. The highest-quality ruby (“pigeon blood” ruby) comes from marbles Mogok Stone Tract central Myanmar. Although has been exploited since 6th century AD, formation time this gemstone ambiguous and controversial. In paper, we describe a mineralogical, geochemical, geochronological study titanite ruby-bearing obtained an ou...

Magmatic and tectonic processes can transport large volumes of magma generated in the deep crust as discrete pulses to shallower crustal depths, resulting incremental construction large, composite batholiths over thousands tens millions years. The Silurian Early Devonian Donegal batholith Ireland is a classic example which regional geological syntheses lithogeochemical data show that emplacemen...

Abstract MinPlot is a MATLAB®-based mineral formula recalculation and compositional plotting program for electron microprobe analyses (EPMA). The offers structural assignment 15 different groups: Garnet, pyroxene, olivine, amphibole, feldspar, mica, staurolite, cordierite, chlorite, chloritoid, talc, epidote, titanite, spinel, sulfides. fast easy to use command line requires no prior computer p...