Continental arc magmatism along the southeast Hearne Craton margin in Saskatchewan, Canada: Comparison of the 1.92–1.91Ga Porter Bay Complex and the 1.86–1.85Ga Wathaman Batholith

Maxeiner, Ralf O.; Rayner, N M

doi:10.1016/j.precamres.2010.10.005

Cited by 13 publications

(6 citation statements)

References 43 publications

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“…The Type-I REE pattern ( Figure 10A) closely matches with dacite and andesite members and their intrusive equivalent of the Andean mountain belt, indicating similar sources for MAG. Old Andean-type continental arc magmas, such as Portar Bay Complex andesites and the Wathaman granitoid batholith of the~1.92-1.85 Ga Trans-Hudson Orogen (Maxeiner and the Rayner 2011), also showed remarkably similar patterns ( Figure 10D), indicating that source rocks of MAG were very similar to these in composition and tectonic association. The high HREE fractionation (Gd/Yb N > 2) in both Types I and III may imply (1) a deep-seated mantle source for precursor igneous melts where garnet and amphibole were the dominant residual phase or (2) a component of slab melt was involved (e.g.…”

Section: Provenancementioning

confidence: 87%

“…For reference, we have also plotted the average andesite, dacite, and rhyodacite of the modern Andean continental margin that are obtained from the large database (over 1000 analyses) of GEOROCK (http://georoc.mpch-mainz.gwdg.de). We also compiled the data for ancient magmatic rocks that originated in Andean-type continental margins such as Portar Bay Complex andesites and the Wathaman batholith of thẽ 1.92-1.85 Ga Trans-Hudson Orogen (Maxeiner and Rayner 2011). It can be seen (Figure 9) that MAG samples show a trace element concentration and pattern exactly similar to those defined by continental margin magmas, indicating an Andean-type continental margin setting of the precursor magma.…”

Section: Tectonic Setting Of Depositionmentioning

confidence: 99%

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Petrology and geochemistry of greywackes of the ~1.6 Ga Middle Aravalli Supergroup, northwest India: evidence for active margin processes

Absar

Sreenivas

2015

International Geology Review

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Geochemical and petrological studies of the well-preserved greywacke horizon of the 'Middle Aravalli Group' were carried out to constrain the early evolution of the Aravalli basin. Petrological and geochemical attributes of Middle Aravalli greywackes (MAGs) such as very poor sorting, high angularity of framework grains, presence of fresh plagioclase and Kfeldspars, variable Chemical Index of Alteration (CIA) index (46.7-74.5, avg. 61), and high Index of Compositional Variability (ICV) value (~1.05) suggest rapid physical erosion accompanying an active tectonic regime. The sediments record post-depositional K-metasomatism and extraneous addition of 0-25% (avg.~10%) K is indicated. Assuming close system behaviour of immobile elements during sedimentation, various diagnostic element ratios such as Th/Sc, La/Sc, Zr/ Sc, and Co/Th, Eu anomaly and rare earth element patterns of MAG suggest that the Archaean Banded Gneissic Complex (BGC) basement was not the major source of sediments. In conjunction with the dominant 1.8-1.6 Ga detrital zircon age peaks of Middle Aravalli clastic rocks, these data rather indicate that the sediments were derived from a young differentiated continental margin-type arc of andesite-dacite-rhyodacite composition. A highly fractionated mid-oceanic-ridge-basaltnormalized trace element pattern of MAGs, with characteristic enrichment of large-ion lithophile elements (LILEs), depletion of heavy rare earth elements, negative Nb-Ta, Ti and P anomalies, positive Pb anomaly, and distinctive Nb/Ta, Zr/Sm, Th/Yb, and Ta/Yb, Ce/Pb ratios envelop the composition of modern continental arc magmas (andesite-dacite) of the Andes, suggesting a subduction zone tectonic setting for precursor magma. High magnitude of LILE enrichment and high Th/Yb ratios in these sediments indicate that thick continental crust (~70 km) underlay the 'Middle Aravalli' continental arc, similar to the Central Volcanic Zone of the modern Andes. We propose that eastward subduction of Delwara oceanic crust beneath the BGC continent led to the formation of a continental volcanic arc, which supplied detritus to the forearc basin situated to the west. This model also explains the opening of linear ensialic basins in the Bhilwara terrain, such as in Rajpura-Dariba and Rampura-Agucha in a classical back-arc extension regime, similar to the Andean continental margin of the Mesozoic. On the basis of the recent 207 Pb/ 206 Pb detrital zircon age of Middle Aravalli sediment, a time frame between 1772 and 1586 Ma can be assigned for Middle Aravalli continental arc magmatism.

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Section: Provenancementioning

confidence: 87%

Section: Tectonic Setting Of Depositionmentioning

confidence: 99%

Petrology and geochemistry of greywackes of the ~1.6 Ga Middle Aravalli Supergroup, northwest India: evidence for active margin processes

Absar

Sreenivas

2015

International Geology Review

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“…At approximately 1910 Ma, extensional volcanism ceased as the Hearne and Rae Provinces docked and intra-oceanic arc volcanism is initiated within the Manikewan Ocean, resulting in the formation of intra-oceanic volcanic rocks that deposit onto previously formed rift-derived volcanic rocks (i.e., La Ronge-Lynn Lake greenstone belt). During this time, continental volcanic arc volcanism occurs along the Hearne margin (Maxeiner and Rayner, 2010) until the docking of the La Ronge-Lynn Lake greenstone belt, which could initiate a subduction reversal at the margin as intraoceanic volcanism becomes dominant.…”

Section: Origin Of the Lynn Lake Greenstone Belt And Implications Formentioning

confidence: 99%

“…Alternatively, it is possible that the Rae and Hearne Provinces had docked prior to 1920 Ma and that the formation of the Snowbird Ocean resulted from initiation of a short-lived, continental-scale asthenospheric upwelling between the Hearne and Rae Provinces (Flowers et al, 2006). At 1910 Ma, the first period of continental arc volcanism was recorded in the Porter Bay Complex (Maxeiner and Rayner, 2010), suggesting that extensional volcanism had ceased within the Snowbird Ocean and subduction along the western Hearne margin had begun. This subducting slab could generate an upwelling plume that would impinge along the eastern Hearne margin, resulting in formation of a rifted margin and in the deposition of rift-derived volcanic rocks, back-arc-like volcanic rocks, and ocean plateau-like volcanic rocks.…”

Section: Origin Of the Lynn Lake Greenstone Belt And Implications Formentioning

confidence: 99%

Geochemistry of the metavolcanic rocks in the vicinity of the MacLellan Au–Ag deposit and an evaluation of the tectonic setting of the Lynn Lake greenstone belt, Canada: Evidence for a Paleoproterozoic-aged rifted continental margin

Glendenning

Polat

2015

Lithos

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“…The Canadian Shield is one of the Earth's major cratons with crustal material dating back to as old as 3.9 Ga (Bowring et al, 1989). It consists of a number of Archean provinces separated by al., 2005;St-Onge et al, 2006;Maxeiner and Rayner., 2010), are routinely and justifiably interpreted in terms of modern plate-tectonic processes given the similar size, geometry, and composition to modern orogens (Corrigan et al, 2009). The nature of Archean boundaries in the Canadian Shield, and of Archean tectonic processes in general (Shirey et al, 2008;Van Kranendonk, 2010) Hynes, 2014), is much less well known.…”

Section: Introductionmentioning

confidence: 99%

Neoarchean arc magmatism and subsequent collisional orogenesis along the eastern Rae domain, western Churchill Province: Implications for the early growth of Laurentia

Regan

Williams

Mahan

et al. 2017

Precambrian Research

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The Athabasca granulite terrane, on the eastern margin of the Rae domain of the western Churchill Province, contains a well exposed record of Neoarchean magmatism, deformation, and metamorphism. Circa 2.63-2.60 Ga plutonic rocks range from 58.01 to 73.71 SiO 2 , and vary from ferroan to magnesian. They form shallow linear trends on modified alkali-lime index, plotting largely in the calcalkaline field. On tectonic discrimination diagrams, all samples plot in the volcanic arc field. Samples are LREE enriched, and contain relatively steep negative slopes, and flat, depleted, HREE profiles when normalized to chondrites. The entire Neoarchean plutonic complex, independent of lithology, contains strong enrichments in the LILEs and Pb, and depletions in HFSEs. Monazite U-Th-total Pb results from a migmatitic paragneiss suggest that partial melting occurred at ca. 2.57 Ga within the Chipman subdomain. Monazite results from the adjacent northwestern subdomain suggest that deformation occurred at ca. 2.57 Ga. IN-SIMS and ICP-MS zircon U-Pb geochronology corroborates these conclusions. Although the region is dominated by Paleoproterozoic localized shear zones, internal to each subdomain is evidence of a widespread tectonothermal event during the Neoarchean that involved arc plutonism, crustal thickening, lower crustal flow at pressures exceeding 1.0 GPa, and extensive partial melting of the lower continental crust. We interpret this sequence of magmatic, deformational, and anatectic processes to reflect the transition from a continental arc to a collisional tectonic setting. The recognized series of events presented herein is likely correlative to the 2.60-2.50 Ga MacQuoid Orogen, which has been recognized further to the northeast, and likely parallels the eastern margin of the Rae domain of the western Churchill Province. These data support an important component of modern style plate tectonics during continental magmatism and accretion in the Neoarchean. Paleoproterozoic orogenic belts (Fig. 1; Hoffman, 1988). The region offers a superb opportunity to investigate the growth and evolution of the North American continent, and to evaluate the degree with which modern tectonic processes were active during the growth and ultimate stabilization of the Archean lithosphere. Many of the stitching Paleoproterozoic orogenic belts (Hoffman, 1988), perhaps none quite as well characterized as the Trans-Hudson Orogen (

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Continental arc magmatism along the southeast Hearne Craton margin in Saskatchewan, Canada: Comparison of the 1.92–1.91Ga Porter Bay Complex and the 1.86–1.85Ga Wathaman Batholith

Cited by 13 publications

References 43 publications

Petrology and geochemistry of greywackes of the ~1.6 Ga Middle Aravalli Supergroup, northwest India: evidence for active margin processes

Petrology and geochemistry of greywackes of the ~1.6 Ga Middle Aravalli Supergroup, northwest India: evidence for active margin processes

Geochemistry of the metavolcanic rocks in the vicinity of the MacLellan Au–Ag deposit and an evaluation of the tectonic setting of the Lynn Lake greenstone belt, Canada: Evidence for a Paleoproterozoic-aged rifted continental margin

Neoarchean arc magmatism and subsequent collisional orogenesis along the eastern Rae domain, western Churchill Province: Implications for the early growth of Laurentia

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