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blueschist

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Series: GSA Special Papers
Published: 09 September 2021
DOI: 10.1130/2021.2552(09)
EISBN: 9780813795522
... eclogite-facies metamorphism took place at ca. 385 Ma, and rocks were exhumed through retrograde blueschist-facies conditions by ca. 360 Ma. Bulk analyses of 18 rocks reflect the presence of mid-oceanic-ridge basalt (MORB), oceanic-island basalt (OIB), and island-arc tholeiite (IAT) basaltic and andesitic...
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Journal Article
Journal: Geology
Published: 08 September 2021
Geology (2021)
... enigmatic mainly due to the scarcity of appropriate rock records. We report the first discovery of early Paleozoic boninitic blueschists and associated greenschists from the eastern Proto-Tethyan North Qilian orogenic belt, northeastern Tibet, which have geochemical affinities that are typical of forearc...
Journal Article
Journal: Elements
Published: 01 February 2021
Elements (2021) 17 (1): 9–16.
...Philippe Agard; Mark R. Handy The Alps preserve abundant oceanic blueschists and eclogites that exemplify the selective preservation of fragments of relatively short-lived, small, slow-spreading North Atlantic–type ocean basins whose subducting slabs reach down to the Mantle Transition Zone at most...
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Series: GSA Field Guide
Published: 18 May 2020
DOI: 10.1130/2020.0059(05)
EISBN: 9780813756592
... California, and is unique in that it exposes a metamorphic complex including blueschist to amphibolite facies rocks, generally known as the Catalina Schist. The only other on-land exposure of these rocks is on the Palos Verdes peninsula south of Los Angeles, but drill-hole data, offshore dredging...
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Journal Article
Published: 20 February 2020
Environmental and Engineering Geoscience (2020) 26 (1): 29–33.
... of cubic yards of earth. Much of the material was composed of serpentinite, blueschist, and other rocks that contain chrysotile and a variety of amphibole minerals, including glaucophane, winchite, actinolite, tremolite, and other asbestos-related amphiboles. This article explores the unique...
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Series: Geological Society, London, Special Publications
Published: 08 October 2019
DOI: 10.1144/SP483.13
EISBN: 9781786204523
...Abstract Abstract Himalayan high-pressure metamorphic rocks are restricted to three environments: the suture zone; close to the suture zone; and (mostly) far (>100 km) from the suture zone. In the NW Himalaya and South Tibet, Cretaceous-age blueschists (glaucophane-, lawsonite- or carpholite...
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Journal Article
Published: 01 August 2019
American Mineralogist (2019) 104 (8): 1065–1082.
... of cold collision and deep slab breakoff, whereas rare occurrences of low T/P metamorphism in the Paleoproterozoic may reveal atypical localized regions of cold collision. Low T/P metamorphism is not known from the Archean geological record, but the absence of blueschists in particular is unlikely...
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Journal Article
Published: 01 May 2019
American Mineralogist (2019) 104 (5): 724–743.
...Yu Wang; Dejan Prelević; Stephen F. Foley Abstract The petrology, mineralogy, and geochemistry of lawsonite blueschists from the Tavşanlı zone in northwest Turkey—one of the best-preserved blueschist terranes in the world—have been comprehensively investigated. The blueschist samples contain...
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Journal Article
Published: 10 January 2019
Journal of the Geological Society (2019) 176 (3): 492–504.
... of various rock types that are now closely associated within allochthonous units representing the Devonian–Carboniferous subduction–accretionary complex. Mafic blueschists of the middle unit yielded a Lu–Hf garnet age of 363.9 ± 1.3 Ma. The blueschists occur within high-pressure, garnet-free phyllites...
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Journal Article
Journal: Geology
Published: 01 January 2019
Geology (2019) 47 (1): e453.
Series: Geological Society, London, Special Publications
Published: 01 January 2019
DOI: 10.1144/SP474.12
EISBN: 9781786204202
... lava structure eclogite; ( b ) lenticular eclogite surrounded by blueschist; ( c ) eclogite interlayered with marble; and ( d ) rodingitized eclogite surrounded by serpentinite. Fig. 4. The geochemistry features of Tianshan eclogites and blueschists (modified from Ai et al. 2006...
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Series: Geological Society, London, Special Publications
Published: 01 January 2019
DOI: 10.1144/SP474.3
EISBN: 9781786204202
... heterogeneous, varying from jadeitite sensu stricto to rocks containing jadeite, lawsonite and quartz in varying proportions. The quartz-bearing suite has also been observed to form concordant layers and discordant veins in blueschist, a very rare feature worldwide. Draper & Nagle (1991) already noted...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 12 December 2018
Lithosphere (2019) 11 (1): 44–58.
...Jeremy L. Cordova; Sean R. Mulcahy; Elizabeth R. Schermer; Laura E. Webb Abstract The Easton metamorphic suite, in the northwest Cascades of Washington State, preserves an inverted metamorphic sequence with ultramafic rocks underlain by amphibolite and high-temperature blueschist juxtaposed above...
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Journal Article
Journal: Geology
Published: 08 August 2018
Geology (2018) 46 (9): 815–818.
...Carl Spandler; Johannes Hammerli; Cassian Pirard Abstract Neodymium isotope geochemistry is pivotal to understanding magma genesis and crustal recycling processes at convergent plate margins. Here, we present Nd isotope compositions of rare earth element (REE)–rich minerals from blueschist...
FIGURES
Journal Article
Published: 01 February 2018
American Mineralogist (2018) 103 (2): 181–196.
... and Hawkesworth 2015 ; Zhong et al. 2015 ). Clasts of metamorphosed mafic rock with incipient blueschist facies mineral assemblages associated with serpentinized peridotites have been recovered during drilling into a seamount in the Mariana forearc. These incipient blueschists comprise aragonite, sodic...
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Journal Article
Journal: Geosphere
Published: 10 January 2018
Geosphere (2019) 15 (1): 24–46.
... in lawsonite. Figure 1. Distribution of lawsonite eclogite localities in the world, classified by the textural position of the lawsonite (Lws) (matrix, inclusion in garnet [grt], pseudomorph). One of the few places in the world with fresh, unaltered lawsonite in eclogite- and blueschist-facies...
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Journal Article
Published: 26 June 2017
European Journal of Mineralogy (2017) 29 (6): 959–970.
... of blueschists and high- P amphibolites found as isolated blocks in the metasediments of the Chilean Coastal Cordillera. The humite minerals are usually less than 0.5 cm in their maximum length and are commonly associated with metamorphic olivine ± magnetite ( Fig. 2a , b ). This assemblage usually consists...
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Journal Article
Published: 03 April 2017
Geological Magazine (2018) 155 (2): 316–334.
..., mineral chemistry and thermodynamic modelling reveal that the mafic schists followed contrasting P–T paths during their tectonometamorphic evolutions. In the schists of the Chah Gorbeh and Ophiolitic complexes an early greenschist-facies stage was later overprinted by blueschist-facies phase assemblages...
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Journal Article
Published: 07 March 2017
Journal of the Geological Society (2017) 174 (4): 741–758.
... of the Palaeo-Tethyan oceanic realm, with peak metamorphism equilibrated under blueschist- to eclogite-facies metamorphic conditions. Implications of these data for the palaeotectonic reconstruction during closure of the Palaeo-Tethyan ocean and the terminal collisional assembly along the southern margin...
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Journal Article
Published: 01 December 2016
European Journal of Mineralogy (2016) 28 (6): 1029–1046.
...Eitaro Sato; Takao Hirajima; Kenta Yoshida; Kenichiro Kamimura; Yoshikazu Fujimoto Abstract This study investigated progressive changes in the mineral assemblage of a Palaeozoic lawsonite-blueschist (LBS) unit of the Kurosegawa belt, Kyushu, Japan. The LBS unit is mainly composed of intercalated...
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