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metagabbro

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Journal Article
Journal: Geosphere
Published: 21 November 2019
Geosphere (2020) 16 (1): 62–81.
... of lawsonite by pumpellyite (1529); (G) small lawsonite-quartz vein in basalt (1607); (H) lawsonite-quartz vein in rhyolite with destabilization of lawsonite into pumpellyite (1518); (I) texture of metagabbro with pristine augite partially replaced by tremolite and plagioclase fully replaced by lawsonite...
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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
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 gabbroic protolith, which is reminiscent of the medium- and fine-grained Volvi metagabbro as revealed at the microscale by the igneous texture of primary lamellar plagioclase and abundant Ti-rich magnetite ( Fig. 2b ; see also the Supplementary Material). However, no primary pyroxene is preserved...
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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
.... 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 ). Various phases of geochronologic and geochemical sample preparation were performed at the University...
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Journal Article
Published: 24 August 2017
Geological Magazine (2018) 155 (8): 1705–1726.
..., 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-monzogabbros with rare meta-peridotites, felsic granulites and metapelites...
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Journal Article
Journal: Geosphere
Published: 09 August 2017
Geosphere (2017) 13 (5): 1329–1358.
.... 5C ), similar to those associated with the Üçkapılı granite, which outcrops mainly in the central Niğde Massif ( Whitney and Dilek, 1998 ) ( Fig. 3 ). Figure 5. Outcrop photographs from the Niğde Mafic Complex. (A) Foliated metagabbro and associated rocks; foliation is north dipping. Aktaş...
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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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Journal Article
Journal: GSA Bulletin
Published: 01 July 2016
GSA Bulletin (2016) 128 (7-8): 1105–1120.
... middle-crustal section in the proto-Andean margin of Gondwana. Mafic rock types consist of amphibolite, metagabbro, and gabbro, as well as pod- and dike-like bodies of gabbro to diorite composition. Field relations together with geochemical and isotopic data for the mafic rocks of the western Sierra de...
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Journal Article
Published: 13 May 2016
Canadian Journal of Earth Sciences (2016) 53 (11): 1336–1371.
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Journal Article
Published: 01 February 2015
Italian Journal of Geosciences (2015) 134 (1): 149–161.
...Lidia Pittarello; Gerlinde Habler; Rainer Abart; Dieter Rhede Abstract Pseudotachylytes, coseismic frictional melts, have formed in metagabbro and within a kinzigitic shear zone of the Ivrea Zone (Italy). In both rock types, amoeboid garnet has crystallized in the pseudotachylyte matrix, locally...
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Journal Article
Published: 01 October 2014
Italian Journal of Geosciences (2014) 133 (3): 409–426.
...-facies metamorphism, but the occurrence of garnet-, omphacite-, talc- and lawsonite-assemblage in a Fe-Ti metagabbro indicates P-T eclogitic conditions (2.5–2.7 GPa for 550–570 °C) very similar to those calculated in the southern sector of the Complex. The stratigraphic characteristics of the meta...
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Journal Article
Published: 23 April 2014
Geological Magazine (2015) 152 (1): 41–69.
... basalt (MORB) origin for the metagabbro. Lherzolite samples define a Sm–Nd isotopic isochron with age of 474 Ma and ɛ Nd( t ) of +8.9. Lherzolite samples with positive ɛ Nd( t ) values of +8.8 to +9.1 and initial 87 Sr/ 86 Sr ratios of 0.7037–0.7040 are rather homogeneous in Sr–Nd isotopic composition...
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Journal Article
Journal: Geology
Published: 01 April 2014
Geology (2014) 42 (4): 323–326.
... Repository 1 ) was used for the Pada-Aru profile. For the Lohu core, which did not penetrate the full thickness of the weathered rock, a visually least weathered sample (granitized metagabbro) at 308 m depth was used in the analysis. The Baltic paleosol formed directly in migmatized metagabbros...
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