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metagabbro

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Journal Article
Published: 04 June 2024
Journal of the Geological Society (2024) 181 (4): jgs2024-043.
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Journal Article
Journal: GSA Bulletin
Published: 12 April 2023
GSA Bulletin (2024) 136 (1-2): 531–546.
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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.
... Massif were locally 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...
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Journal Article
Published: 30 January 2023
Geological Magazine (2023) 160 (1): 198–205.
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Journal Article
Published: 29 September 2022
Geological Magazine (2023) 160 (2): 260–273.
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Series: GSA Special Papers
Published: 19 May 2022
DOI: 10.1130/2022.2554(09)
EISBN: 9780813795546
...); (D) metagabbro 10Ca68 with rotated amphibole porphyroclasts (AmI) in a foliation characterized by chlorite (Ch), metamorphic amphibole (AmII), and white mica (Wm); (E–F) greenschist 11Ca75 showing clusters of epidote (Ep), titanite (Tt), amphibole (Am), and chlorite (Ch); (G–H) metarhyolite 11Ca101a...
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Journal Article
Journal: Geology
Published: 12 May 2022
Geology (2022) 50 (8): 964–968.
... are occasionally visible, either filled by euhedral talc flakes in Mg-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...
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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 Figure 3. Lithological sketch maps of three major Vuurdood Subsuite intrusive bodies (see Figure...
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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.
... minerals have been analyzed in eight samples: metagabbro (1530, 1531, 1532, 1727, and 1728), lawsonite-quartz vein (and metabasalts matrix, 1734 and 1529), and metasediment (1722). Representative analyses are shown in Table 2 . TABLE 2. REPRESENTATIVE ANALYSES White mica is rare overall...
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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
Published: 01 January 2019
The Journal of Geology (2019) 127 (1): 81–107.
... al. 1982 ; Basta et al. 1986 ; Abd El-Rahman et al. 2009 ) once mapped as geosynclinal metasediments (El Ramly 1972 ). All the classic elements of the ophiolite sequence can be found within the GMA area, including serpentinized peridotites, metagabbros, sheeted dikes, and pillow lavas (Basta et...
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