Monazite dating Dating sites 100 gratuit sexe
Migration of this fluid was probably responsible for heterogeneous fluid-assisted recrystallization and resetting of original prograde monazite, even where included in garnet, staurolite or kyanite.
It is suggested that the rocks passed the chlorite-in reaction on the retrograde path at 332 ± 7 Ma.
Structurally above the Moravo-Silesian zone are the high-grade rocks of the Moldanubian domain: high-pressure granulites and migmatites that underwent vertical extrusion and are in this region strongly reworked by shallow-dipping migmatite flow (e.g. The Moravo-Silesian zone is separated from the Moldanubian domain by a belt of kyanite-bearing micaschists (the Micaschists zone; Suess, 1912).
The Moravo-Silesian zone emerges from beneath the Moldanubian domain in three tectonic windows (from north to south): the Silesian zone, and the Svratka and the Thaya windows (Suess, 1912, 1926); the latter two are known as the Moravian zone (Figs 1 and 2).
In the absence of detectable diffusion profiles this is most commonly interpreted as a result of dissolution–precipitation in the presence of fluids (Putnis, 2002; Harlov path, or be meaningless.The Saxothuringian oceanic and continental domain, the Teplá–Barrandian, the Moldanubian and the Brunia continental domains are the major tectonic units of the Variscan Bohemian Massif, assembled in Devonian and Carboniferous times [Fig. The Saxothuringian was partly subducted to the SE below the Moldanubian–Lugian domain that formed the thickened root above the subduction zone, with the Teplá–Barrandian representing its uppermost part (Schulmann , 2009). Lower left inset shows the position of the study area in the framework of the European Variscides (modified after Edel (2008)].The Moldanubian and Lugian domains are composed of north–south-trending belts of orogenic lower crust dominated by (ultra-)high-pressure granulites and migmatites (the Gföhl unit) alternating with middle to upper crustal sequences dominated by the volcano-sedimentary Varied and Monotonous groups. Lower left inset shows the position of the study area in the framework of the European Variscides (modified after Edel Geological map of the Bohemian Massif. Here, underthrusting of the Brunia microcontinent (Dudek, 1980) beneath high-grade rocks of the Moldanubian–Lugian domain resulted in a 300 km long deformation front called the Moravo-Silesian zone (Suess, 1912).Petrography, garnet zoning and mineral-equilibria modelling in the framework of their structural development are used to infer the prograde and retrograde paths.Monazite abundance, size, chemistry, zoning, textural position and petrological context are described prior to LASS simultaneous measurement of isotopic ratios and rare earth elements (REE).