نتایج جستجو برای: granulite
تعداد نتایج: 412 فیلتر نتایج به سال:
Newly discovered xenoliths within Pliocene and Quaternary intermediate volcanic rocks from southern Peru permit examination of lithospheric processes by which thick crust (60–70 km) and high average elevations (3–4 km) resulted within the Altiplano, the second most extensive orogenic plateau on Earth. The most common petrographic groups of xenoliths studied here are igneous or meta-igneous rock...
In this study, we focus on a partially melted garnet-bearing granulite from the Salvador–Esplanade Belt (Salvador da Bahia, Brazil), and examine behaviour of major trace elements during partial melting melt-driven metasomatism. Phase equilibria modelling U–Th–Pb geochronology show that sample underwent heating segment decompression path ~1.2 GPa 675–700°C to ~0.8 790°C at c. 2.06 Ga. During fin...
In Holsnøy (Bergen Arcs, Norway), metastable granulite facies anorthosite rocks are partially eclogitised within hydrous shear zones, that have been interpreted as widening over time with fluid influx and strain. We here present a detailed petrological description of two different metre-scale zones from this area. Within few tens centimetres each zone, the protolith (initially plagioclase + gar...
FINDING OF PLAGIOCLASE-BEARING GRANULITE FROM THE IRATSU EPIDOTE AMPHIDOLITE MASS IN CENTRAL SHIKOKU
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