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metagabbro

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Journal Article
Published: 10 September 2020
Mineralogical Magazine (2020) 84 (5): 662–690.
... and Storø island, contain a succession of supracrustal rocks comprising volcano-sedimentary schists, tholeiitic amphibolite with associated metagabbros and fragmental andesitic amphibolites, interpreted as a relict island arc complex formed at c. 3070 Ma (Garde, 2007 ; Szilas et al. , 2016b , 2017...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 30 June 2020
Lithosphere (2020) 2020 (1): 8825465.
...-Pb dates of spatially associated anorthositic dykes ( 425.1 ± 2.2 Ma) and a metagabbro ( 423.8 ± 2.5 Ma) from the Fox Back Ridge intrusion of the Blair River inlier reveal Late Silurian emplacement ages. Their contemporaneity suggests that they may be members of a larger intrusive complex...
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Journal Article
Journal: GSA Bulletin
Published: 02 June 2020
GSA Bulletin (2021) 133 (1-2): 134–148.
... gabbros (ca. 177–175 Ma) occur as dikes intruding into the basement complex. The early metagabbros are characterized by arc-like geochemical features and enriched Nd-Hf isotopic compositions (whole rock ∑ Nd (t) = –0.7 to +0.3; zircon ∑ Hf (t) = –5.7 to –2.2), which suggests formation by partial melting...
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Journal Article
Journal: Geosphere
Published: 21 November 2019
Geosphere (2020) 16 (1): 62–81.
... (tuffs and radiolarian cherts) associated with a few microgabbro and metabasalt blocks. Metamorphism of this unit has not been further studied here; however, one sample was collected for temperature determination. Metamorphic minerals have been analyzed in eight samples: metagabbro (1530, 1531...
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Journal Article
Published: 27 September 2019
Journal of the Geological Society (2020) 177 (1): 103–119.
... the serpentinization of ultramafic masses. Very little is known about the structural settings and tectonic histories that influence and control the occurrence of asbestos in non-serpentinized rocks diffusely embedded within tectonized ophiolitic suites. Focusing on a case history provided by a tectonized metagabbro...
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Journal Article
Published: 10 September 2019
Journal of the Geological Society (2020) 177 (1): 66–81.
... Baltic and exotic origins. In the past century this complexity has generated conflicting interpretations, which we have tested with new mapping and isotope dilution thermal ionization mass spectrometry U–Pb dating. The new data show the following: (1) a metagabbro low in the tectonostratigraphy has...
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Journal Article
Published: 21 June 2019
Journal of the Geological Society (2019) 176 (5): 847–862.
...P. D. Kinny; R. A. Strachan; M. Fowler; C. Clark; S. Davis; I. Jahn; R. J. M. Taylor; R. E. Holdsworth; E. Dempsey Abstract A tract of amphibolite-facies granitic gneisses and metagabbros in northern Shetland, UK, is here named the Uyea Gneiss Complex. Zircon U–Pb dating indicates emplacement...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 29 March 2019
Lithosphere (2019) 11 (3): 365–385.
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Journal Article
Journal: GSA Bulletin
Published: 09 November 2018
GSA Bulletin (2019) 131 (3-4): 572–586.
... report field and microscopic evidence for the partial melting of arc-related metagabbro and its products, including TTG-like melt, volumetrically significant plutons evolved from melt, and the associated granulitic residua during continental collision in the North Qaidam Mountains, China. Migmatite shows...
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Journal Article
Published: 22 October 2018
Journal of the Geological Society (2019) 176 (5): 945–957.
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Journal Article
Published: 12 June 2018
Journal of the Geological Society (2019) 176 (5): 931–944.
... ( Papanikolaou & Panagopoulos 1981 ; Zagorčev 1994 ). The metamorphic basement of the western RM (Rila Mountain) is considered as the extension of the Ograzhden unit of the SMM in Bulgaria ( Zagorčev 1994 ; Zagorchev 2001 ), where the metagabbro–metadiorite bodies have island arc tholeiitic (IAT) and calc...
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Journal Article
Published: 22 February 2018
Journal of the Geological Society (2018) 175 (4): 667–678.
...). Metaperidotite samples from the Babu ophiolites show high Os concentrations and low Re/Os, 187 Os/ 188 Os and 187 Re/ 188 Os ratios, and represent residual upper mantle. Metagabbro and metabasalt samples show light rare earth element (LREE)-depleted REE patterns and N-MORB-like primitive mantle-normalized spider...
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Series: GSA Memoirs, GSA Memoirs
Published: 11 September 2017
DOI: 10.1130/2017.1213(12)
EISBN: 9780813782133
..., 2011, personal commun.). Care was taken to select lithologies that were characteristic of the plutons. In some instances, associated metagabbros were sampled. The Gladesville gabbro in central Georgia was not sampled directly, but zircon were separated from the contact aureole ( Huebner et al., 2017...
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Journal Article
Published: 24 August 2017
Geological Magazine (2018) 155 (8): 1705–1726.
... include (from the bottom to the top; Fig. 1 ): (1) granulite-facies metagabbros and meta-monzogabbros with rare meta-peridotites, felsic granulites and metapelites; and (2) metapelites with intercalations of metabasites, rare marbles and felsic orthogneisses (Paglionico & Piccarreta, 1978 ; Schenk...
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Journal Article
Journal: Geosphere
Published: 09 August 2017
Geosphere (2017) 13 (5): 1329–1358.
...), also in agreement with results of hornblende-plagioclase thermometry from the metagabbroic rocks. Overall, the evidence overwhelmingly indicates middle-upper amphibolite-facies temperatures for metamorphism and deformation of the NMC. Depending on geothermal gradient, this implies a depth...
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Journal Article
Published: 23 May 2017
Geological Magazine (2018) 155 (2): 280–297.
...-bearing eclogitic metagabbro associated with carbonated serpentinites and glaucophanic metasediments. The metagabbro body reached eclogitic metamorphic peak conditions at T = 465–477°C and P = 20.9–24.4 kbar, with H 2 O continuously supplied to the system. H 2 O under-saturated conditions...
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Journal Article
Published: 01 December 2016
South African Journal of Geology (2016) 119 (4): 607–622.
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