Introduction: The source and duration of the heating event responsible for eucrite metamorphism is not well constrained. Three hypotheses have been proposed for the source of heat: Impact, conduction from the mantle, and rapid production of successive flows [1]. Textural and chemical relationships of noncumulate eucrites are investigated to constrain the thermal and temporal conditions responsi...

Large earthquakes occur in rocks undergoing high-pressure/low-temperature metamorphism during subduction. Rhythmic major-element zoning in garnet is a common product of such metamorphism, and one that must record a fundamental subduction process. We argue that rhythmic major-element zoning in subduction zone garnets from the Franciscan Complex, California, developed in response to growth-dissol...

Four metasedimentary zircon populations from different tectonometamorphic units of the Central and the Northern Schwarzwald (Variscan belt, SWGermany) were investigated using SEM, cathodoluminescence and SHRIMP dating. Despite partially strong modifications of primary internal morphologies during Variscan metamorphism at amphibolite (750 C, 0.4– 0.6 GPa) and granulite-facies conditions (950–1,0...

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...

Abstract The distribution of ultrahigh-pressure metamorphism ( UHP ) at the scale a mountain belt is prime importance for deciphering its past subduction history. In Western Alps, coesite has been recognized in southern Dora-Maira Massif, lens-shaped Brossasco-Isasca Unit, but not found up to now other parts massif. We report discovery new unit northern Massif (Western Alps), named Chasteiran U...

Northern Mozambique hosts numerous occurrences of gold mineralization in metamorphic terranes, which are little known because the insufficient studies. In this work, we describe main geological and geochemical characteristics Nanlia Makorongo prospects located Namuno district, northeastern Mozambique. We report mode occurrence gold, petrography mineralogy host rocks ores, fluid inclusion stable...