It is well established that the major and minor element contents of chromites are subject to change during greenschist amphibolite facies metamorphism. During upper metamorphism, chromite can be completely converted chrome magnetite. However, not all elements affected same degree, concentrations +2 ions (e.g. Zn, Co, Mn) being particularly vulnerable modification. The degree which trace element...

Metamorphism along the southern margin of the Archean Superior Province has been historically attributed to the Penokean orogeny. A narrow corridor of amphibolite facies rocks north of the main suture does record 1.83–1.80 Ga metamorphic monazite U–Th–Pb ages that mark the culmination of arc accretion. However, subsequent widespread amphibolite facies metamorphism and associated magmatism is re...

introduction the occurrence of blueschist metamorphic facies is believed to mark the existence of former subduction zones. this facies is represented in the main constituents of subduction-accretion complexes, where it occurs in separate tectonic sheets, imbricated slices, lenses, or exotic blocks within a serpentinite mélange (volkova et al., 2011). the evidence of the presence and maturity of...

The eastern part of the Adelaide Geosyncline contains well preserved glaciomarine sequences of the Sturtian glaciation (:750–700 Ma) including calcareous or dolomitic siltstone, manganiferous siltstone, dolostone and diamictite units and the associated Braemar ironstone facies. The ironstone facies occurs as matrix to diamictites and as massive to laminated ironstones and comprises abundant Fe ...

An exceptional exposure of volcaniclastic breccia intercalated with radiolarian cherts and limestones was studied which constitutes a unique block within the Upper Cretaceous Mamonia Mélange in Akamas Peninsula southwestern Cyprus. This breccia, represents lower part sedimentary cover Triassic Phasoula Formation volcanics. The mainly consists clasts metabasalts, diabases, metagabbros, hyaloclas...

Mineralogical and oxygen isotopic analyses of samples from Deep Sea Drilling Project Sites 477, 481, and 477 in the Guaymas Basin indicate the existence of two distinct hydrothermal systems. In the first, at Sites 481 and 478, hot dolerite sills intruded into highly porous hemipelagic siliceous mudstones that were moderately rich in organic matter, thermally altered the adjacent sediments, and ...

Abstract The Meran-Mauls nappe stack is part of the Austroalpine unit in South Tyrol (Italy). There it holds a special position directly front Southalpine Dolomites indenter and west Tauern Window. It situated hanging wall unit, above NW dipping segment Periadriatic fault system, namely fault. Also all other sides are defined by Oligocene-Miocene strike-slip normal faults. Based on recent mappi...