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Four garnet-free felsic granulite xenoliths (XY11-28, XY11-30, XY11-31 and XY11-33) were collected from the No. 7 volcanic diatreme. Sample XY11-28 has a fine-grained granoblastic microstructure and consists of plagioclase ... The chips were then crushed in a carborundum jaw crusher (to 60 mesh).
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The topics include regional amphibolite- to granulite-facies metamorphism and partial melting associated with lower crustal magma emplacement, crustal assimilation, transcrustal …
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Applying the two-feldspar thermometry, the data from P-T modeling could be confirmed, showing that felsic granulite experienced UHT-metamorphic conditions, as did the mafic granulite. The respective temperature ranges for the felsic granulite are 1041–1078 °C for sample 18YJZ08 and 1052–1081 °C for sample 18YJZ10 (at 15kbar, respectively).
Zircon LA-ICP-MS U-Pb dating suggests that the protolith of the felsic granulite was emplaced at 2541 ± 7 Ma and the subsequent medium-pressure granulite-facies metamorphism occurred at 2518-2494 Ma. A two-stage mantle plume related crustal-scale sagduction geodynamic regime is proposed in the western Shandong terrane in the Neoarchean.
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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.
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Granulite (felsic) 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, cordierite may also be …
Melting of felsic meta-igneous rocks followed by magmatic differentiation is thus a viable mechanism to form Li-F-rich rare-metal granites and pegmatites, providing a direct link between protracted crust recycling and rare-metal magmatism in late-orogenic settings. ... Furthermore, the dehydration of the lower crust induced by granulite-facies ...
Based on our field investigation, we newly identified some felsic granulite exposures in the Taipingzhai area (Fig. 1 b). In order to constrain their metamorphic conditions and evolutionary history, we collected two representative samples (JD29–1, N 40°16′32″, E 118°21′8″; JD11–2, N 40°14′00″, E 118°31′56″) and conducted ...
Detailed petrography, mineral chemistry, metamorphic evolution and zircon U-Pb dating are presented for felsic granulite and two-pyroxene granulite from the Yishui complex …
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 connection. ... visiting different types of felsic granulites, amazing outcrops of metapelitic migmatites and finally the ...
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Toward the NW, the Serre lower-crustal rocks are juxtaposed onto Variscan amphibolite-facies orthogneisses of the Castagna Unit (Fig. 1 c) along a mylonitic thrust (Curinga-Girifalco Line: CGL).Schenk (1980) obtained a Rb-Sr age of biotite of 43 ± 1 Ma on a mylonitic gneiss of the Castagna Unit, indicating CGL activity of Alpine age (Brandt and Schenk, 2020; …
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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 ...
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ABSTRACT "This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)." Intellectual Merit. The Athabasca granulite terrane, Saskatchewan, Canada is one of Earth's largest exposures of intact lower continental crust, and offers the opportunity to see first-hand the complexity of magmatic processes that contributed to formation of the deep …
The garnet-bearing felsic granulite has a well-developed compositional and textural layering (Fig. 2A), comprising medium- to coarse-grained anhydrous leucosome, a fine- to coarse-grained residuum and a poorly developed selvedge of hornblende at the margins of the leucosome (Fig. 2B). The layering is typically closely-spaced and bulk ...
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The Phase-II granulite-facies metamorphism is represented by fine-grained minerals (Grt 2, Cpx 2, Pl 2, Amp 2 and Spn in mafic granulite; Grt 2 and Kfs 2 in felsic gneiss) occurring in the "red-eye socket" textures of the mafic granulite and felsic gneiss (Fig. 3 a–e, j–l) and in the locally developed fine-grained aggregates in the ...
