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paragneiss

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Journal Article
Published: 05 July 2023
Geological Magazine (2023) 160 (7): 1262–1281.
... et al . 2018 and references therein) and represents the metamorphic core of the orogenic belt. Deformation with a top-to-the-S kinematics, linked to the MCTz, affected both the bottom of the GHS and the upper part of the LHS. In the lower part of the GHS garnet- to kyanite-bearing paragneiss...
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Journal Article
Journal: Geology
Published: 02 November 2022
Geology (2023) 51 (1): 39–43.
... and temperature. We compiled a global database of 5729 major-element whole-rock analyses of pelites from different metamorphic grades (shales to granulite-facies paragneisses) to (1) determine an average composition, (2) examine the range and variability in their composition, and (3) assess if there is evidence...
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Journal Article
Journal: GSA Bulletin
Published: 20 July 2022
GSA Bulletin (2023) 135 (3-4): 903–914.
...%), with accessory K-feldspar, ilmenite, titanite, and apatite ( Fig. 2D ). The matrix exhibits a finegrained granoblastic texture and a foliation that is defined by the alignment of stubby rectangular quartz and plagioclase. Sample C47 was collected from ã3 × 15 m raft of pelitic paragneiss found within...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 10 February 2022
Lithosphere (2021) 2021 (Special 6): 2103213.
... recrystallization in medium temperature samples and grain boundary migration in high-temperature paragneiss samples [ 31 ]. Feldspar porphyroclasts of all sheared lithotypes present evidence of intracrystalline deformation (undulose extinction, deformation lamellae, deformation twinning, and twin boundary migration...
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Journal Article
Published: 01 February 2022
Russ. Geol. Geophys. (2022) 63 (2): 137–152.
... of relict Paleoarchean (3.4 Ga) melanocratic granulites and predominant Neoarchean mafic and felsic granulites (2.70–2.66 Ga), paragneisses (≤2.75 Ga), and gneissic granites (2.54 Ga). The Paleoproterozoic complexes include paragneisses (1.95–1.85 Ga), granitoids and charnockites (1.86–1.84 Ga), as well...
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Journal Article
Journal: Geosphere
Published: 22 December 2021
Geosphere (2022) 18 (1): 298–326.
... adjacent to the North Cascades crystalline core are important for identifying the source of multiple metasedimentary units within the Late Cretaceous–Eocene North Cascades arc. Zircon grains from six paragneiss samples from the Skagit Gneiss and from two metapelite and two conglomerate samples from...
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Journal Article
Published: 01 July 2021
American Mineralogist (2021) 106 (7): 1172–1182.
...Graciela Sosa; Sebastián Oriolo; Alfons van den Kerkhof; Pablo Diego González; Ezequiel Olaizola; Florencia Bechis Abstract Quartz segregations in paragneisses from the Paleozoic basement of the North Patagonian Andes contain highly saline multiphase fluid inclusions with the rare daughter mineral...
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Series: Geological Society, London, Memoirs
Published: 27 May 2021
DOI: 10.1144/M55-2018-51
EISBN: 9781786209863
... (V1) volcanic rocks of the southern Antarctic Peninsula are derived from the isotopically uniform magma, but they have mixed with melts of upper-crustal paragneiss in high-level magma chambers. The V2 rhyolites from the northern Antarctic Peninsula are the result of assimilation and fractional...
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Journal Article
Journal: GSA Bulletin
Published: 22 April 2021
GSA Bulletin (2022) 134 (1-2): 179–200.
... and lower arc crust, and the contributions of these rocks to the evolution of arc crust remain unclear. In this paper, we conduct a systematic study of petrology, geochronology, and geochemistry of migmatitic paragneisses from the eastern Gangdese magmatic arc, southern Tibet. The results show...
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Journal Article
Published: 26 February 2021
Canadian Journal of Earth Sciences (2021) 58 (10): 1027–1039.
... continued thermal activity during the Rigolet phase of the orogen that resulted in migmatization of paragneiss at ca. 1004 Ma and juxtaposition of upper- and mid-crustal rocks during orogenic collapse. The lithologic ages and tectonic history of the Trenton Prong correlate to those in other Appalachian...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 08 February 2021
Lithosphere (2021) 2021 (1): 6697858.
... 38.52496 70.81857 RT13-146 Kurguvad Granitoid ZrU/Pb, GC, TS, XRD qz-bt-ms-plg-kfsp-ep qz-bt-ab-mc-ep 38.45605 71.11402 RT13-148 Kurguvad Paragneiss ZrU/Pb, TS qz-bt-plg-grt-kfsp 38.3997 71.06168 RT13-149 Kurguvad Granitoid GC, TS, XRD qz-bt-ep-kfsp-plg-ms qz-bt-ep-ab-mc-chl...
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Journal Article
Published: 02 December 2020
Environmental & Engineering Geoscience (2021) 27 (1): 95–111.
... ). The Gadria is underlain by paragneiss and orthogneiss lithologies from the Permian and Cretaceous metamorphisms. Sediment produced by the weathering of these highly fractured rocks and thick Quaternary deposits fills the channel network, generally through shallow debris slides, rockfalls, and dry raveling...
Journal Article
Journal: GSA Bulletin
Published: 01 December 2020
GSA Bulletin (2021) 133 (7-8): 1483–1504.
... in early Earth. The Paleoproterozoic Aketashitage orogenic belt is located at a key position in northwestern China and connects the North China craton, Tarim craton, Altaids orogen, and Tethys orogen. Garnet-bearing mafic and paragneissic granulite occur as interlayers or blocks preserved within...
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Journal Article
Journal: GSA Bulletin
Published: 07 October 2020
GSA Bulletin (2021) 133 (5-6): 1021–1038.
..., the oldest rocks of which contain granulite-facies mineral assemblages and all of which are deformed. Leucopegmatites that intrude pelitic paragneisses, which likely formed in response to high-grade metamorphism and which are all deformed, are 370–355 Ma in age. All metapelitic paragneisses contain...
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Journal Article
Published: 10 September 2020
Mineralogical Magazine (2020) 84 (5): 662–690.
... of >900°C. The last preserved stages of retrogression are recorded in paragneiss plagioclase–garnet, biotite–garnet and host rock ilmenite–magnetite pairs (≤3 kbar and ~380–560°C). The Amikoq Complex intruded a MORB-like crustal section and the former remained relatively undisturbed in terms of modal...
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Journal Article
Published: 28 July 2020
Canadian Journal of Earth Sciences (2021) 58 (1): 21–37.
.... Garnet paragneiss sample BAN015 was collected along the old Hastings railway track, northeast of Bronson Lake. The outcrop is located within the Elzevir terrane slightly south of the inferred trace of the Bancroft shear zone. Foliation is characterized by dark biotite bearing bands that are interlayered...
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