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metagabbro

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Journal Article
Published: 21 April 2022
Journal of the Geological Society (2022) 179 (4): jgs2021-140.
... is a lithologically diverse, imbricated and discontinuous allochthon. It consists of felsic gneisses and dykes dated by zircon U–Pb to c. 3100, 2940, 2830, 2510 and 1800–1750 Ma. These rocks yield titanite ages of 2810–2700, 1750, 1660–1590 and 430–420 Ma. Metagabbro intruded at 1995 Ma. The ages and evolution...
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Journal Article
Published: 01 September 2021
South African Journal of Geology (2021) 124 (3): 805–814.
... types present include gabbro, metagabbro, quartz-metagabbro, peridotite and troctolite. © 2021 Geological Society of South Africa. All rights reserved. 2021 Geological Society of South Africa The regional geologic setting of the RMA ( Figure 1 a) highlights its significance as one of the older...
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Journal Article
Published: 10 September 2020
Mineralogical Magazine (2020) 84 (5): 662–690.
..., on the Qussuk peninsula, Bjørneøen island 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...
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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.
... with destabilization of lawsonite into pumpellyite (1518); (I) texture of metagabbro with pristine augite partially replaced by tremolite and plagioclase fully replaced by lawsonite and pumpellyite (1530); (J) overgrowth of Na-rich amphibole over tremolite in gabbro (1530); (K) overgrowth of Na-rich amphibole over...
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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.
... of the SMM in Bulgaria ( Zagorčev 1994 ; Zagorchev 2001 ), where the metagabbro–metadiorite bodies have island arc tholeiitic (IAT) and calc-alkaline affinities ( Machev 2002 ). These mafic rocks are locally associated with boudins of lherzolite?–clinopyroxenite cumulates ( Bazylev et al. 1999...
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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
Published: 11 September 2017
DOI: 10.1130/2017.1213(12)
EISBN: 9780813782133
... ) consists of serpentinized ultramafic rocks, metapyroxenite, metagabbro, amphibolite, and metachert, interpreted in the course of several studies as a dismembered ophiolite ( Mittwede et al., 1987 ; Mittwede, 1989 ; Chaumba, 2010a ). Merschat and Hatcher (2007) interpreted the mafic and ultramafic rocks...
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Journal Article
Published: 24 August 2017
Geological Magazine (2018) 155 (8): 1705–1726.
.... 13 km thick ‘layer’ of granitoids (Caggianelli, Prosser & Rottura, 2000 ; Fornelli et al. 2004 ); and (3) medium- to low-grade upper-crust metamorphic rocks. The lower-crust rocks in the Serre Massif include (from the bottom to the top; Fig. 1 ): (1) granulite-facies metagabbros and meta...
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