Petrology of mafic and ultramafic intrusions from the Portneuf–Mauricie Domain, Grenville Province, Canada: Implications for plutonic complexes in a Proterozoic island arc

Sappin, A A; Constantin, Marc; Clark, Thomas

doi:10.1016/j.lithos.2012.07.016

Cited by 27 publications

(4 citation statements)

References 55 publications

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“…The best known of these deposits is Aguablanca (Spain), a 15.7-Mt deposit grading 0.66% Ni, 0.46% Cu, 0.47 g/t PGEs, and 0.13 g/t Au (Pina et al, 2006). In Canada, small Ni-Cu ± PGE deposits such as Lac Edouard and Giant Mascot formed from mafic and ultramafic intrusions emplaced in island-arc settings (Sappin et al, 2011(Sappin et al, , 2012Manor et al, 2016).…”

Section: Orogenic Ni-cu ± Pge Depositsmentioning

confidence: 99%

Apatite Trace Element Compositions: A Robust New Tool for Mineral Exploration

et al. 2016

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Section: Orogenic Ni-cu ± Pge Depositsmentioning

confidence: 99%

Apatite Trace Element Compositions: A Robust New Tool for Mineral Exploration

et al. 2016

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“…3f). However, the occurrence of magnesiohornblende, pargasite, and edenite (see below), locally with magmatic or metamorphic textures, indicates that they were probably formed at the late-magmatic to earlymetamorphic stages (Sappin et al 2012). Pale green clinopyroxene forms heavily fractured grains with ragged margins, which commonly becomes an unstable magmatic mineral phase and underwent metamorphic replacement by greenish amphibole and chlorite along margins and cleavage planes.…”

Section: Field Relation and Petrographymentioning

confidence: 99%

Tectonic significance of Triassic mafic rocks in the June Complex, Sanandaj–Sirjan zone, Iran

et al. 2017

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This study concentrates on the petrological and geochemical investigation of mafic rocks embedded within the voluminous Triassic June Complex of the central Sanandaj-Sirjan zone (Iran), which are crucial to reconstruct the geodynamics of the Neotethyan passive margin. The Triassic mafic rocks are alkaline to sub-alkaline basalts, containing 43.36-49.09 wt% SiO 2 , 5.19-20.61 wt% MgO and 0.66-4.59 wt% total alkalis. Based on MgO concentrations, the mafic rocks fall into two groups: cumulates (Mg# = 51.61-58.94) and isotropic basaltic liquids (Mg# = 24.54-42.66). In all samples, the chondrite-normalized REE patterns show enrichment of light REEs with variable (La/Yb) N ratios ranging from 2.48 to 9.00, which confirm their amalgamated OIB-like and E-MORB-like signatures. Enrichment in large-ion lithophile elements and depletion in high field strength elements (HFSE) relative to the primitive mantle further support this interpretation. No samples point to crustal contamination, all having undergone fractionation of olivine ? clinopyroxene ? plagioclase. Nevertheless, elemental data suggest that the substantial variations in (La/Sm) PM and Zr/Nb ratios can be explained by variable degrees of partial melting rather than fractional crystallization from a common parental magma. The high (Nb/Yb) PM ratio in the alkaline mafic rocks points to the mixing of magmas from enriched and depleted mantle sources. Abundant OIB alkaline basalts and rare E-MORB appear to be linked to the drifting stage on the northern passive margin of the Neotethys Ocean.

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“…In orogenic belts, mafic-ultramafic intrusions have been correlated to several different sources/ways for their magma generations and emplacement. Some were associated with post-orogenic settings, mainly with mantle plumes and/or LIPS, others are considered syntectonic, but some examples are interpreted as pre-orogenic intrusions, emplaced before the peak of orogeny (e.g., Sappin 2012;Manor, 2014;Maier et al 2005, Pina et al, 2018Su, 2014, Barnes et al 2019.…”

Section: Environments For Mafic-ultramafic Rocksmentioning

confidence: 99%

“…In these compressive environments, the mafic-ultramafic intrusions have been correlated to a variety of sources and pathways for magma generation and emplacement. A few intrusions located in orogenic environments are interpreted to be pre-orogenic, but most of them are interpreted to be syn-collisional, commonly related to cumulates of magmatic arc roots or even backarc basins, and some can be related to post-orogenic settings, commonly linked to mantle plumes and/or LIPs (e.g., Barnes et al, 2019;Le Vaillant et al, 2020a;Maier et al, 2008;Piña, 2019;Sappin et al, 2012) The Americano do Brasil Complex is part of a group of mafic-ultramafic intrusions occurring in the southern segment of the Goiás Magmatic Arc, in the Neoproterozoic Brasilia Belt. The intrusions are broadly associated with the Brazilian Orogeny and have been interpreted as syntectonic intrusions associated with the second magmatic event in the Arenópolis Arc, but the specifics of the origin and emplacement of these mafic bodies are poorly constrained (Nilson and Santos, 1982;Laux et al, 2004;Augustin and Della Giustina, 2019).…”

Section: Objectivesmentioning

confidence: 99%

Petrogenesis of Mafic-Ultramafic Intrusions in the Southern Goiás Magmatic Arc, Central Brazil

Augustin¹

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The Americano do Brasil and Mangabal Complexes belong to a cluster of Neoproterozoic mafic-ultramafic intrusions in the southern Goiás Magmatic Arc in Brazil that lies within the Brasília Belt, a complex, long-lived Neoproterozoic Orogen that formed during the amalgamation of the São Francisco/Congo, Amazonian, and Paranapanema Cratons in western Gondwana. Although deformed and partially recrystallized by a regional metamorphic overprint, the rocks of both complexes still preserve igneous textures. The rocks in both complexes show cumulate textures that range from adcumulate to orthocumulate. Petrography, geochemistry, geochronology, and petrological modeling were carried out to constrain the petrogenesis of the complexes.Modeling indicates that the parental magma for the Americano do Brasil Complex had an OIB-like Fe-rich picrite composition, while the parental magma of the Mangabal Complex could have been a tholeiitic basalt. Considering the temporal and spatial correlations, decompression melting of upwelling asthenosphere triggered by rollback subduction and/or influence of a mantle plume are plausible mechanisms to explain the petrogenesis of these mafic-ultramafic intrusions in the vicinities of the eastern Arenópolis arc and westernmost Anápolis-Itauçu belt. The complexes have experienced a protracted metamorphic evolution with peaks indicating amphibolite facies. The rock from both complexes shows late-stage alteration associated with metasomatism by CO2-Ca-S-rich fluids.

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Petrology of mafic and ultramafic intrusions from the Portneuf–Mauricie Domain, Grenville Province, Canada: Implications for plutonic complexes in a Proterozoic island arc

Cited by 27 publications

References 55 publications

Apatite Trace Element Compositions: A Robust New Tool for Mineral Exploration

Apatite Trace Element Compositions: A Robust New Tool for Mineral Exploration

Tectonic significance of Triassic mafic rocks in the June Complex, Sanandaj–Sirjan zone, Iran

Petrogenesis of Mafic-Ultramafic Intrusions in the Southern Goiás Magmatic Arc, Central Brazil

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