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·A felsic granulite from South Neimenggu Inner Mongolia of China has been deformed at the confining pressure of 1100 MPa temperatures of 650～900℃ and strain rates of 10 4 ～10 7 s 1 650～900℃、1100ΜΡa10
·The chosen compositions represent felsic and mafic to intermediate granulites as observed in xenoliths from southern LT o N 87 o E ca 30 km north of the IYS 39 40 as well as pelite
·Rheology of Felsic Granulite at High Temperature and High Pressure D P Wen1 Y F Wang1 2 J F Zhang1 2 P X Li1 3 and Z M Jin1 2 1School of Earth Sciences and State Key Laboratory of Geological Processes and Mineral Resources
·The scarcity of well preserved high pressure granulite facies terranes minimally obscured by later tectonic events has limited our ability to understand how closely Archean tectonic processes may have resembled better understood modern processes Here we describe Neoarchean gneisses in the Teton Range of Wyoming USA that record Ga high
·Menzerite Y a new mineral species forms reddish brown cores n = 20 up to 70 μm across rimmed successively by euhedral almandine containing up to wt% Y 2 O 3 and by K feldspar in a felsic granulite on Bonnet Island in the interior Parry Sound domain Grenville Orogenic Province Canada It is named after Georg Menzer 1897 1989 the
·The first type is represented by felsic granulite xenoliths They have upper intercept zircon ages of Ga and lower intercept ages of 105 122 Ma and are characterized by variable
·The Xinyang felsic granulite xenoliths contain quartzofeldspathic relics mainly 10 mm in size lie close to the tieline between plagioclase and K feldspar and near the field of typical igneous rocks from the NCC Fig 3 and show positive values Table 1 These features suggest that the xenoliths have an igneous parentage
·The felsic granulite has granoblastic microstructure consists of plagioclase quartz ± diopside ± K feldspar ± Fe Ti oxide The assemblages of granitic gneiss and charnockite are plagioclase quartz hypersthene and plagioclase quartz K feldspar respectively The mafic granulites are with or without garnet both typical of two
·These complex zircons are intergrown with garnet and clinopyroxene of the host granulite facies assemblage and thus the Paleoproterozoic ages of the metamorphic overgrowths are interpreted to
·Detailed microstructural microfabric and chemical analyses of felsic granulite within and around a ductile shear zone at the Plešovice quarry in the southern Bohemian Massif revealed deformation induced retrograde transformation of kyanite to andalusite is absent outside the shear zone its fraction among Al 2 SiO 5 polymorphs
·Large mafic to ultramafic blocks in felsic gneisses on the northern part of the Howard Hills Napier Complex East Antarctica are accompanied by phlogopitebearing pyroxene granulite occurring in the margins of the block In order to understand the crustal evolution of the Napier Complex especially regarding the thermal history after peak metamorphism Rb Sr
Several granulite terrains are exposed in the Bohemian Massif of Central Europe These were metamorphosed at pressures close to 12 kbar and temperatures of more than 800 °C c 340 Ma ago The corresponding penetrative deformation almost totally erased the record of the preceding metamorphic evolution Nevertheless rare relics such as mineral inclusions in large garnet
·Large mafic to ultramafic blocks in felsic gneisses on the northern part of the Howard Hills Napier Complex East Antarctica are accompanied by phlogopite bearing pyroxene granulite occurring in
·Four intermediate to felsic igneous rocks from the Zhangjiakou region along the northern margin of the North China craton have magmatic zircon U Pb ages from 122 to 144 of these samples have inherited zircon U Pb ages of Ga similar to the zircon ages of rocks from the surrounding granulite from two intermediate composition
Published C isotope systematics and C/He flux calculations do not support the model of granulitization by influx of mantle C0 2 nor is the total population of δ 13 C values of Au deposits comparable to mantle CO 2 or the granulite C reservoir
the felsic granulites may have subducted to depths of >120 200km and was then exhumed rapidly to the base of thickened crust to form the typical HP UHT granulite facies assemblages observed
·For example Guilmette et al 2011 shown that the felsic granulite recorded peak metamorphic P T conditions of >14 kbar and 825 °C possibly up to 15 16 kbar and 850 °C which was followed by decompression and cooling to 9 kbar and 810 °C Fig 11
·Here we present results from a felsic granulite from the Chencai Complex in the northeastern West Cathaysia terrane Petrographic evidence mineral compositions and phase equilibria modeling
·The felsic granulite at the Plešovice quarry has been retrogressed at temperatures of 490 590 °C assuming pressures of 300 500 MPa and subsequently mylonitized in the ductile shear zone at temperatures of 390 440 °C assuming a pressure of 250 MPa However deformation inside the ductile shear zone promoted transformation of kyanite to
·The felsic granulite south of Tarcu is a well foliated rock characterised by the occurrence of garnet crystals with variable dimensions up to mm in size Figs 2 d 3 a An alternation of millimetre thick quartzofeldspathic layers with those rich in mafic minerals biotite garnet is common Inside the quartzofeldspathic rock portion a
·Three mafic granulite samples 15KL01 8 17KLJJL 15KL2 3 17PJW 2 and one felsic granulite 17PJW 1 were selected for petrology mineral composition analysis P T calculation and zircon U Pb dating Fig 2 Sample 15KL01 8 and 17KLJJL were collected near Tandanghe and sample 15KL2 3 was collected near Zhoujiahe
·High pressure granulite and granulite gneiss from the Rychleby Mountains in the East Sudetes form an approximately 7 km long and km wide body which is enclosed by amphibolite facies orthogneiss with a steep foliation Well preserved felsic granulite is located in the central part of the body where several small bodies of mafic granulite are also present
DOI / Corpus ID 129655304; Crustal evolution of the Southern Granulite Terrane south India New geochronological and geochemical data for felsic orthogneisses and granites
·High pressure granulite and granulite gneiss from the Rychleby Mountains in the East Sudetes form an approximately 7 km long and km wide body which is enclosed by amphibolite facies orthogneiss with a steep preserved felsic granulite is located in the central part of the body where several small bodies of mafic granulite are also present
Detailed microstructural microfabric and chemical analyses of felsic granulite within and around a ductile shear zone at the Plešovice quarry in the southern Bohemian Massif revealed deformation induced retrograde transformation of kyanite to andalusite Although andalusite is absent outside the shear zone its fraction among Al 2</SUB>SiO<SUB loc="post">5</SUB> polymorphs
·The felsic granulite records the peak metamorphic stage M2 defined by the matrix minerals and the garnet mantle and the retrograde stage defined by the symplectite and the garnet rim M3 P T estimations using pseudosection techniques and two feldspar thermometry yield ∼8 kbar/710 828 °C for the prograde stage M1 ∼ 15
·Origin of felsic granulite microstructure by heterogeneous decomposition of alkali feldspar and extreme weakening of orogenic lower crust during the Variscan orogeny J FRANĚK It shows that the precursor of the Variscan felsic granulites was a high pressure alkali feldspar rich coarse grained layered orthogneiss Its S1 subhorizontal
