نتایج جستجو برای: pressure metamorphism
تعداد نتایج: 409319 فیلتر نتایج به سال:
Ke y w o r d s : impact features, shock metamorphism, shock waves, minerals, crystal structure, defects, experimental study Apollo Luna Earth N um be r of c ra te rs ( > 1 km ) pe r km 2 0.04
The geological complexities of contractional orogenic belts have been studied for two centuries, yet our understanding of them is still rapidly changing. Most mountain belts form at or near the active edges of continents and/or fringing island arcs. Virtually all result from consumption of lithospheric plates, involving the underflow of oceanic crust, and the consequent transport and descent of...
Klonowska, I. 2017. Deep subduction of the Seve Nappe Complex in the Scandinavian Caledonides. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1595. 63 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-513-0139-6. This thesis seeks to improve our understanding of the processes involved in continental collision zones, with a particular f...
The Northern Dabie Complex in east central China lies between the Sino–Korean plate to the north and the Yangtze plate to the south. The Northern Dabie Complex has been variously proposed to represent a Paleozoic magmatic arc on the Sino–Korean plate, an exhumed piece of subducted Yangtze plate crust, or crust produced almost entirely by Cretaceous extension-related magmatism. Trace element com...
Metamorphic rocks that mostly consist of amphibolite, amphibole schist, garnet hornblendite and rarely metamorphosed chemical and terrigenous sediments are found in the ophiolitic complex of north Torbat-E- Heidarieh. Thermobarometry calculations of amphibolite samples indicate temperature higher than 800 °C and pressure less than 5 Kb. Metamorphic conditions of amphibole schist and garnet hor...
The pre-Eocene Allahyarlu ophiolitic- metamorphic complex is exposd in the core of the Allahyarlu anticline in the northwest of Iran and northeast of Meshginshahr. This complex consists of a variety of schist, gneiss, amphibolite and metadibase rocks with serpentinite and tectonic slices including gabbro, dunit, marble and diabase. Amphibolites can be divided into garnet-free amphibolite and ga...
The composition of Kuh-e- Barandeh volcanic dome is andesite, dacitic andesite and dacite of calc-alkaline affinity. A prominent feature of this dome is the presence of various types of enclaves with different composition, shape and size. Detailed field and laboratory investigation proved that they are of xenolith and autolith types. The xenoliths are of pelitic and basic protoliths. Xenoliths ...
This paper first reports the counter-clockwise pressure-temperature (P–T) path for Lützow–Holm Complex in East Antarctica. The metamorphic textures of kyanite-bearing pelitic gneisses from Tenmondai Rock including earlier spinel and ilmenite inclusions, geothermobarometric data, pseudosection modeling indicate that pressure increases prior to peak conditions at around 9 ± 0.5 kbar 770–820 °C, f...
U-Pb analyses of zircon from ten samples of augen gneisses, eight mafic and intermediate metaigneous rocks and six metasediments from some tectonic domains along the Calabria-Peloritani Terrane (Southern Italy) contribute to knowledge of peri-Gondwanan evolution from Late-Proterozoic to Paleozoic times. All samples were equilibrated under amphibolite to granulite facies metamorphism during the ...
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