INTRODUCTION Precambrian rocks in the Tusas Mountains range from nearly monomineralic quartzite, in which the principal result of metamorphism has been simple recrystallization, through locally metasomatized schist and gneiss profoundly modified by potash-rich fluids during the intrusion of pegmatite. Texturally, the rocks range from schist and phyllite containing penetrative and pervasive clea...

The Alpi Apuane (northern Apennines) represent a key area for understanding the processes related to Apennines building and geodynamic evolution of central Mediterranean, but timing tectono-metamorphic events is still debated. White mica from cover rocks Massa units was investigated by 40Ar-39Ar in situ step-heating techniques. Samples recorded several episodes deformation developed under low-g...

Most research on shore platforms has been at fairly large spatial scales over distances ranging from hundreds to thousands of metres. Other work much smaller scales, one several decimetres, often corresponds the dimensions micro-erosion meter stations. Few studies have concerned with platform morphology in which basic data are acquired intermediate or meso-scales up a few This is due, part, ter...

late neoproterozoic-early cambrian schists have been occurred in southwest of zanjan city from the soltanieh belt. the soltanieh belt in northwest of iran is uplifted basement of precambrian-paleozoic in main central iran zone and includes outcrops of precambrian, paleozoic and mesozoic formations. late neoproterozoic-early cambrian schists, the oldest stratigraphy unit in the region, consist o...

The tectonic structures of the Mako area in Kédougou-Kéniéba inlier (KKI) were mapped with tele-analytical investigation which is validated by field data. This study based on different images processing particular: 1) colored combinations (1 to 5) and panchromatic (8) thematic mapping bands Landsat-8 (ETM+) satellite; 2) Digital Elevation Model (DEM) image Space Shuttle Radar Topography Mission...

Late Neoproterozoic-Early Cambrian schists have been occurred in southwest of Zanjan city from the Soltanieh belt. The Soltanieh belt in northwest of Iran is uplifted basement of Precambrian-Paleozoic in main central Iran zone and includes outcrops of Precambrian, Paleozoic and Mesozoic Formations. Late Neoproterozoic-Early Cambrian schists, the oldest stratigraphy unit in the region, consist o...

IN a previous account (Brown, ~967) of the granitic sheets and veins in the Loch Coire migmatite complex, a metasomatic origin was postulated. This has now been confirmed by new analyses. Read (I93I) described the Loch Coire complex as made of three zones; one of unmigmatized meta-sediments, one of granitic veins and one of 'injection' or migmatite. The sheets and veins of granite (sensu lato),...

Abstract The Maršíkov–Schinderhübel III pegmatite in the Hrubý Jeseník Mountains, Silesian Domain, Czech Republic, is a classic example of chrysoberyl-bearing LCT granitic beryl–columbite subtype. This thin dyke, (up to 1 m thickness biotite–amphibole gneiss characterised by symmetrical internal zoning. Tabular and prismatic chrysoberyl crystals (≤3 cm) occur typically intermediate albite-rich ...