Geochemistry of 1.9 Ga MORB- and OIB-like basalts from the Amisk collage, Flin Flon Belt, Canada: Evidence for an intra-oceanic origin

Stern, Richard A.; Syme, E C; Lucas, Stephen Bernard

doi:10.1016/0016-7037(95)00202-b

Cited by 99 publications

(36 citation statements)

References 74 publications

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“…5) and plutonic rocks are predominantly juvenile (i.e., positive initial ε Nd values of +2 to +5, similar to the contemporaneous depleted mantle; Stern et al 1995aStern et al , 1995b and show only limited contributions from older crustal sources. Stern et al (1995a) suggested that the contributions from older crustal sources were best explained by recycling of small amounts (<10%) of Archean and (or) older Proterozoic crust via sediment subduction or possibly intracrustal contamination.…”

Section: Ga Juvenile Arc Assemblagesmentioning

confidence: 99%

“…The range in lithological and geochemical associations, Sm/Nd isotopic signatures, and U-Pb zircon ages has allowed us to subdivide the greenstones into a series of 1.92-1.87 Ga arc and ocean-floor assemblages Stern et al 1995aStern et al , 1995bLucas et al 1996). These contrasting volcanic assemblages are separated by early high-strain zones and are stitched by crosscutting plutons (1.88-1.84 Ga), suggesting that they were accreted to form a tectonic collage at 1.88-1.87 Ga (Amisk collage of Lucas et al 1996) (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…We first review (after Stern et al 1995aStern et al , 1995bLucas et al 1996) the lithologic, stratigraphic, and geochemical characteristics of (1) the juvenile arc assemblages, and (2) the juvenile ocean-floor assemblages, which together make up about 88% of the 1.92-1.87 Ga greenstones in the Flin Flon Belt (Table 1). We then focus on three specific examples in the Flin Flon juvenile arc assemblage (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Contrasting arc and MORB-like assemblages in the Paleoproterozoic Flin Flon Belt, Manitoba, and the role of intra-arc extension in localizing volcanic-hosted massive sulphide deposits

et al. 1999

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The Flin Flon Belt (Trans-Hudson Orogen, Manitoba and Saskatchewan) is the largest Paleoproterozoic volcanic-hosted massive sulphide (VMS) district in the world, with 118.7 million tonnes (Mt) of Zn-Cu-(Au-Ag) sulphide ore in 25 past or presently producing mines and 64.3 Mt in subeconomic deposits. The orebodies are restricted to isotopically juvenile volcanic-arc sequences, dated at 1.903-1.881 Ga at Flin Flon. Sequences of ca. 1.904-1.901 Ga back-arc and ocean-plateau basalts and related plutonic rocks, structurally juxtaposed with the arc assemblages at 1.880-1.870 Ga, are not known to contain economic base metal deposits. The juvenile arc tectonostratigraphic assemblages are generally marked by older and stratigraphically lower tholeiitic submarine volcanic packages (ca. 1.903-1.886 Ga) that are observed or interpreted to be overlain by extensive and lithologically varied sequences of calc-alkaline and alkaline (shoshonitic) arc rocks and arc rift deposits (ca. 1.888-1.881 Ga). VMS deposits occur in both the tholeiitic and calc-alkaline arc sequences, but the 62 Mt Flin Flon deposit occurs in a 1.903 Ga tholeiitic primitive arc package. It can be demonstrated that for the Flin Flon -Callinan -Triple 7, Cuprus, and White Lake VMS deposits, whose stratigraphic context is preserved, deposition of the massive sulphides was temporally associated with inferred arc rifting processes. Critical observations for arc rifting include evidence for extensional faulting, erosion, and development of unconformities; extrusion of MORB-like basalts and associated rhyolites; and development of depositional basins with thick sequences of shoshonitic turbidites. As has been proposed for other major VMS camps (e.g., Kuroko, Kidd Creek, Bathurst), arc rifting can generate the loci of sustained high heat flow and fluid pathways required for the development of long-lived hydrothermal convection systems.Résumé : La Zone de Flin Flon (de l'orogène trans-hudsonien, au Manitoba et en Saskatchewan) représente le plus grand district de sulfures massifs associés à des roches volcaniques dans le monde, avec 118,7 millions de tonnes (Mt) de minerai sulfuré de Zn-Cu-(Au-Ag) dans les 25 gisements actuellement ou antérieurement en production, auxquels on doit ajouter 64,3 MT dans des gîtes à teneur subéconomique. Les corps minéralisés sont restreints aux séquences d'arc volcanique isotopiquement juvéniles qui sont datées de 1,903-1,881 Ga à Flin Flon. On n'a pas réussi à trouver des gîtes de métaux communs à teneur économique dans les séquences d'arrière-arc âgées approximativement de 1,904-1,901 Ga, et ni dans les basaltes de plateau océaniques ou dans les roches plutoniques associées qui sont structuralement juxtaposées aux assemblages d'arc âgés de 1,880-1,870 Ga. Dans les assemblages tectonostratigraphiques d'arc juvénile, apparaissent généralement des lots de roches volcaniques tholéiitiques plus anciennes (environ 1,903-1,886 Ga) d'origine sous-marine à un niveau stratigraphique inférieur; ces lots sont observés ou interprétés comme étant r...

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Section: Ga Juvenile Arc Assemblagesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Contrasting arc and MORB-like assemblages in the Paleoproterozoic Flin Flon Belt, Manitoba, and the role of intra-arc extension in localizing volcanic-hosted massive sulphide deposits

et al. 1999

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“…6 and 7). Similar trace element patterns have been documented for many Phanerozoic transitional to enriched OIB-type basalts hosted by accretionary complexes of Central Asia, Far East and Japan (e.g., Chen et al, 1991;Ichiyama et al, 2008;, and Proterozoic and Archean volcanic rocks interpreted as ocean island basalts (e.g., Stern et al, 1995;Polat et al, 1999;Komiya et al, 2004).…”

Section: Transitional and Enriched Basaltsmentioning

confidence: 69%

Geochemical diversity in oceanic basalts hosted by the Zasur’ya accretionary complex, NW Russian Altai, Central Asia: Implications from trace elements and Nd isotopes

Safonova

Сенников

Komiya

et al. 2011

Journal of Asian Earth Sciences

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“…Thorium abundances vary considerably between samples, and high Th/Nb ratios are seen in eclogite samples. These features also indicate either a subduction signature or crustal contamination (Pearce, 1996;Stern, Syme, & Lucas, 1995). Moreover, all eclogite samples display patterns similar to the present-day N-type MORB (Sun & McDonough, 1989).…”

Section: Geochemistrymentioning

confidence: 92%

Petrology and geochemistry of eclogites from the Biga Peninsula, Northwest Turkey

et al. 2012

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The Biga Peninsula in northwest Turkey contains high-pressure metabasic eclogite that occur in two localities; as lenses within a 2 km long, 500 m thick quartz-phengite schist slice that is in turn found in the greenschist-facies metasedimentary rocks of the Çamlıca metamorphics, in Çamlıca area, and in two north-south elongated eclogites occurring as a tectonic slice between Kazdağ Massif and Çetmi Group, in Çetmi area. The P-T conditions under which these two exposures of eclogites formed are important to quantify the tectonic processes of subduction, exhumation and emplacement that highpressure rocks of the Biga Peninsula record. New geochemical data suggest that both protoliths were N-type MORB basalt with high TiO 2 and K 2 O-Na 2 O content and Nb/Y ratios. Most eclogite samples have tholeiitic signatures volcanic arc settings. ∑REE abundances range from 47.55 to 107.4 ppm. Europium anomalies are slightly variable (Eu/Eu * = 0.9-1.1) and trace element contents are similar to typical MORB based on tectonic discrimination diagrams. All eclogite protoliths were probably derived from depleted mantle source, modified by fluids within the subduction zone. The high-P mineral assemblage in eclogites from both regions is omphacite + garnet + glaucophane + phengite + epidote + zoisite + quartz. The inclusions in garnet are glaucophane, quartz, phengite, Ca-amphibole and rutile. P-T conditions are similar to each other and constrained at 550-700°C and 16-24 kbar. Geochemical data and mineral chemistry indicate that the eclogites in the Biga Peninsula represent oceanic crust processed at significant depths (50-80 km) within the subduction channel and were juxtaposed with greenschist facies as a tectonic slice in the accretionary complex at higher structural levels.

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Geochemistry of 1.9 Ga MORB- and OIB-like basalts from the Amisk collage, Flin Flon Belt, Canada: Evidence for an intra-oceanic origin

Cited by 99 publications

References 74 publications

Contrasting arc and MORB-like assemblages in the Paleoproterozoic Flin Flon Belt, Manitoba, and the role of intra-arc extension in localizing volcanic-hosted massive sulphide deposits

Contrasting arc and MORB-like assemblages in the Paleoproterozoic Flin Flon Belt, Manitoba, and the role of intra-arc extension in localizing volcanic-hosted massive sulphide deposits

Geochemical diversity in oceanic basalts hosted by the Zasur’ya accretionary complex, NW Russian Altai, Central Asia: Implications from trace elements and Nd isotopes

Petrology and geochemistry of eclogites from the Biga Peninsula, Northwest Turkey

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