نتایج جستجو برای: protolith

تعداد نتایج: 242  

Journal: :Lithos 2022

In exhumed orogens, refractory mafic rocks have the potential to preserve a record of petrogenesis and high-pressure (HP) metamorphism that is commonly obliterated in quartzofeldspathic owing re-equilibration at high-temperature, low-pressure (LP–HT) conditions. Montagne Noire (France) migmatite dome, located foreland Variscan orogen, eclogite exposed both core margin dome. this study, we combi...

Journal: :Geosciences 2022

The tectonic evolution of the Siberian Cratonic margins offers important clues for global paleogeographic reconstructions, particularly with regard to complex geological history Central Asia and Precambrian supercontinents Columbia/Nuna Rodinia its subsequent breakup opening Paleo-Asian Ocean. Here, we present an overview geochemical, petrological, geochronological data from a suite various roc...

Journal: :Geodinamika i Tektonofizika 2021

The study is focused on metapelitic granulites of Cape Kaltygei (Western Baikal region) that contain a diagnostic mineral assemblage ultrahigh temperature (UHT) metamorphic rocks (orthopyroxene+sillimanite+quartz). pseudosection-based thermobarometry yields peak and pressure values (T=950 °C, P=~9 kbar) suggests near-isobaric cooling (IBC) conditions during the retrograde evolution granulites. ...

2017
J. Parnell M. Perez J. Armstrong L. Bullock J. Feldmann A. J. Boyce

The Dalradian Supergroup of Britain and Ireland is mineralised by gold-tellurium vein deposits. The host succession includes carbonaceous, pyritic shales (pelites) which were a source of trace elements, including gold and tellurium. LA-ICP-MS mapping of pyrite crystals shows that late stages are enriched in gold, tellurium and lead, representing concentration of these elements during metamorphi...

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