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metagabbro

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Journal Article
Journal: GSA Bulletin
Published: 12 April 2023
GSA Bulletin (2023)
...) and has enriched mid-oceanic-ridge like geochemical characteristics; we suggest that the meta-basalt was sourced from the depleted mantle and interacted with enriched components in an initial oceanic basin setting. Zircon U Pb geochronology of meta-basalt and metagabbro yielded crystallization ages of ca...
Journal Article
Journal: Geology
Published: 29 March 2023
Geology (2023) 51 (6): 537–542.
...Ruihong Chang; Franz Neubauer; Yongjiang Liu; Johann Genser; Qingbin Guan; Qianwen Huang; Sihua Yuan Abstract The Austroalpine domain contains the type locality of eclogites, but their protolith age is unknown except for a Permian metagabbro. Therefore, we studied the non-gabbroic eclogites from...
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Journal Article
Journal: GSA Bulletin
Published: 03 February 2023
GSA Bulletin (2023) 135 (9-10): 2563–2574.
.... The ophiolitic slices are composed of serpentinites, metagabbros, and metabasalts, and interleaved with deformed volcaniclastic rocks. Using zircon U-Pb dating, we determined an age of 253 ± 2 Ma for the metagabbro, which suggests that the ophiolite formed during the Late Permian. Geochemical data and geologic...
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Journal Article
Journal: GSA Bulletin
Published: 03 February 2023
GSA Bulletin (2023) 135 (9-10): 2486–2509.
... overprinted by eclogite facies mineral assemblages during the Early Cambrian time (ca. 535 Ma). The latter age is based upon a single eclogitic-metagabbro sample (Sample 5) that yielded at its bright luminescent rim domains (three spots) a U-Pb concordant age of 535.0 ± 3.3 Ma (MSWD = 8). The dark luminescent...
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Series: GSA Special Papers
Published: 19 May 2022
DOI: 10.1130/2022.2554(09)
EISBN: 9780813795546
... mylonite 11Ca105 with albite (Ab) porphyroblasts containing relict garnet rotated between oriented white mica (Wm) and biotite; (C) metapelitic mylonite 16Ca72 showing a rotated albite (Ab) porphyroblast between strongly oriented white mica (Wm) and chlorite (Ch); (D) metagabbro 10Ca68 with rotated...
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Journal Article
Journal: Geology
Published: 12 May 2022
Geology (2022) 50 (8): 964–968.
...-rich metagabbros (Zermatt area, Fig. 1A ) or by omphacite and garnet in Fe-rich metagabbros (Monviso area, Fig. 1B ). Figure 1. (A) Hand specimen view of an eclogite-facies metabasite from the Pfulwepass area (Zermatt-Saas unit, Switzerland), showing a vug filled by talc (Tlc) flakes...
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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. Perioditites have been metamorphosed to serpentinite, with variable quantities of secondary amphibole and chlorite, depending on the amount of original pyroxene and plagioclase. In low strain domains the primary...
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Journal Article
Published: 10 September 2020
Mineralogical Magazine (2020) 84 (5): 662–690.
... with metavolcanoclastic rocks (Garde, 1997 ). The south-eastern part of the Akia terrane, 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...
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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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