Monazite age dating results for felsic granulite sample Z7-14-5. (a) Probability density plots of all analysed samples (blue), inclusions in garnet (red), cores of grains and homogeneous grains ...
Granulites are a type of high-grade metamorphic rock that forms under conditions of high temperature and pressure. They are characterized by the presence of granular minerals, which means that the mineral grains are roughly equidimensional and roughly the same size. The most common minerals found in granulites include feldspar, pyroxene, amphibole, and garnet.
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 Ma. Two of these samples have inherited zircon U-Pb ages of ~ 2.5 Ga, similar to the zircon ages of rocks from the surrounding granulite terrain. Zircons from two intermediate composition granulite xenoliths …
Detailed petrography, mineral chemistry, metamorphic evolution and zircon U-Pb dating are presented for felsic granulite and two-pyroxene granulite from the Yishui complex to …
The current study is the first one that focuses on P-T conditions of felsic granulite from the Jiaobei terrane. Using P-T modeling similar peak P-T conditions were derived, for the …
High pressure granulite and granulite gneiss from the Rychleby Mountains in the East Sudetes form an approximately 7 km long and 0.8 km wide body, which is enclosed by amphibolite facies ...
The excursions will allow participants to observe in the field iconic sections of granulite to migmatite terranes and to discuss topics such as lower crustal structure and composition, mantle metasomatism, granulite-granite …
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 ...
The 2. 34 cm-wide garnet porphyroblast in the Paleoproterozoic felsic granulite from the Huangtuling area, North Dabieshan, has been reinvestigated for compositional variation in light of ...
High pressure granulite and granulite gneiss from the Rychleby Mountains in the East Sudetes form an approximately 7 km long and 0.8 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.
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facies terrains span the range of mafic to felsic. Granulite facies roc ks are distinguished from amphibolite facies . rocks by the dehydration of hydrous miner al phases. The water-rich minerals ...
For the felsic granulite, metamorphic P-T conditions of the M1 and M3 assemblages were estimated to be ∼680 to 750 °C/6–8 kbar and ∼670 to 680 °C/5 kbar, respectively, also including ITD ...
The first type is represented by felsic granulite xenoliths. They have upper intercept zircon ages of 1.75–1.89 Ga and lower intercept ages of 105–122 Ma, and are characterized by variable ...
In this study, we present mafic granulites and host felsic gneisses with a "red-eye socket" texture from the Shuanglong area, eastern NQOB, which recorded two phases of …
felsic granulite on the north shore of Bonnet Island in Georgian Bay, offshore from the town of Parry Sound, Ontario, Canada (UTM coordinates 0567531W 5003719N; NAD 83 datum, zone 17). Bonnet Island
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 ∼8–9.8 kbar/710–828 °C for the prograde stage M1, ∼14.5–15 ...
The Himalayan-Tibetan orogen experienced extensive thermal disturbance during the Indian-Asian collision, yet evidence for ultrahigh-temperature metamorphism (UHTM, >900 °C) remains scant. We report a UHTM event in the Lhasa Block, identified from felsic granulite xenoliths in Sangsang near the Tangra Yum Co Rift (TYR) of southern Tibet.
Request PDF | Menzerite-(Y) a New Species {(Y REE)(Ca Fe2plus)2}[(Mg Fe2plus)(Fe3plus Al)](Si3)O12 from a Felsic Granulite Parry Sound Ontario and a New Garnet End-member (Y2Ca)Mg2(SiO4)3 ...
Menzerite-(Y), a new mineral species, forms reddish brown cores, n = 1.844 (20), up to 70 μm across, rimmed successively by euhedral almandine containing up to 2.7 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 …
Granulite: Granulite is a high-grade metamorphic rock in which Fe-Mg-silicates are dominantly hydroxyl-free; the presence of feldspar and the absence of primary muscovite are critical, …
Kyanite-garnet felsic (type 1) granulite with exceptionally well-preserved early structures from slopes of Mt. Kleť. a-Grs profile (mol. %) across a 400 µm large euhedral garnet I inclusion in ...
Petrographic observations suggest that the studied felsic granulites have suffered multi-stage metamorphism, and the distinct metamorphic events were documented by …
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 ...
Hadean continental crust in the southern North China Craton: evidence from the Xinyang felsic granulite xenoliths. Xianquan Ping *, Jianping Zheng, Huayun Tang, Qiang Ma, W. L. Griffin, Qing Xiong, Yuping Su * Corresponding author for this work.
Конусан бутлуурын ашиглалт уул уурхайн салбар, хүдэр олборлолтын хэмжээ нэмэгдэж байна. Бутлуурыг ашиглах нь уул уурхайн салбарт үр дүнтэй болох нь …
Most of the Hannuoba mafic xenoliths can be best explained as residues left after partial melting of the late Archean lower crust that may be represented by the granulite terrain to produce the ...
Олон улсын дэвшилтэт бутлах технологийг эзэмшиж, HGT Gyratory бутлуур нь том хүчин чадалтай, өндөр үр ашигтай шинэ төрлийн ухаалаг бүдүүн бутлуур юм..
The two different compositional types of garnet (Grt1, Grt2) preserved in the studied samples of the felsic granulite south of Tarcu record different metamorphic P-T conditions. Grt1 refers to a HP granulite/amphibole-eclogite facies transition (1.3–1.75 GPa, 650–700 °C considering both investigated samples, Fig. 13). The calculated ...
