Archaean calc-alkaline volcanism in the Pilbara Block, Western Australia

Barley, Mark; Sylvester, G.C.; Groves, David; Borley, G. D.; Rogers, Nick

doi:10.1016/0301-9268(84)90062-7

Cited by 43 publications

(9 citation statements)

References 44 publications

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“…incompatible-element-enriched mantle materials (Drury 1983;Barley et al 1984). Figure 11 demonstrates that felsic volcanic rocks of the Noranda compositional type are apparently restricted to the Canadian Shield.…”

Section: Comparison With Other Archean Felsic Volcanic Rocksmentioning

confidence: 96%

Geochemistry and origin of Archean felsic metavolcanic rocks, central Noranda area, Quebec, Canada

Ujike¹,

Goodwin²

1987

Can. J. Earth Sci.

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Felsic magma petrogenesis was studied by analyzing 24 stratigraphically controlled Archean andesite-to-rhyolite lava flows of both tholeiitic and calc-alkalic affinity from the upper Noranda Subgroup, Quebec, using instrumental neutron activation and X-ray fluorescence techniques. The lavas have moderate values of [LaIYb], (0.9-3.8) and low values of 100 X ThlZr ( -I). According to calculations following batch partial melting and Rayleigh fractional crystallization models, both the calcalkalic and tholeiitic felsic volcanic rocks are probably products of shallow-level fractional crystallization of mafic parental magmas formed respectively by lower ( -7 % for calc-alkalic) and higher ( -14% for tholeiitic) degrees of partial melting of a primitive mantle source.Contribution to the magma genesis from plausible crustal materials was negligible. A back-arc-type diapirism is geochemically suggested for the tectonic model of origin of Noranda felsic magmas, in conformity with geological observations. Felsic volcanic rocks with compositions analogous to the studied samples exist in several other Archean terrains of the Canadian Shield, suggesting thereby that the late Archean sialic crust was at least in part produced by volcanic rocks ultimately derived from the primitive mantle.Une Ctude de la pktrogentse du magma felsitique a Ct C effectuCe au moyen d'analyses par les techniques d'activation neutronique instrumentale et de fluorescence des rayons X de 24 coul&s de lave d'andCsine i rhyolite, d'affinitks tholCiitiques et calco-alcalines, du Sous-groupe de Noranda supCrieur, et pour lesquelles la stratigraphie archCenne a Ct C bien vCrifCe. Les laves foumissent des rapports [LaIYb], (0,9-3,8) modCk et 100 x ThlZr ( -1) faible. D'aprbs les calculs fondCs sur les modbles de foumCes de fusion partielle et de la cristallisation fractionnke de Rayleigh, il apparait que les roches volcaniques felsitiques calco-alcalines et tholkiitiques sont probablement les produits de la cristallisation fractionnCe, 21 un niveau ClevC dans les magmas parentaux mafiques formCs respectivement par des degks de fusion partielle plus faibles ( -7% pour calcoalcalines) et plus ClevCs ( -14% pour tholeiitiques) du magma primitif dans le manteau.La contribution i la genbse du magma des matCriaux formant la croQte fut minime. La gCochimie suggbre un diapirisme de type arritre-arc comme modtle tectonique de l'origine des magmas felsitiques de Noranda, conformCment aux observations gCologiques. Les roches volcaniques felsitiques avec des compositions analogues i celles des Cchantillons CtudiCs existent dans plusieurs autres terrains archkens du Bouclier canadien, indiquant par 18 que la crofite sialique de 1'ArchCen supkrieur fut au moins en partie produite par les roches volcaniques dCrivtes fondamentalement du manteau primitif.[Traduit par la revue]Can.

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Section: Comparison With Other Archean Felsic Volcanic Rocksmentioning

confidence: 96%

Geochemistry and origin of Archean felsic metavolcanic rocks, central Noranda area, Quebec, Canada

Ujike¹,

Goodwin²

1987

Can. J. Earth Sci.

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“…Alternatively, the operation of horizontal tectonics in the east Pilbara has been advocated by several workers, based on structural evidence and a calc‐alkaline, volcanic arc interpretation for the origin of c. 3.45‐Ga felsic volcanic rocks and tonalites (Bickle et al. , 1980, 1983, 1985, 1993; Barley et al. , 1984, 1998; Boulter et al.…”

Section: Previous Workmentioning

confidence: 99%

Review: secular tectonic evolution of Archean continental crust: interplay between horizontal and vertical processes in the formation of the Pilbara Craton, Australia

et al. 2007

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The Archean Pilbara Craton contains five geologically distinct terranes – the East Pilbara, Karratha, Sholl, Regal and Kurrana Terranes – all of which are unconformably overlain by the 3.02‐ to 2.93‐Ga De Grey Superbasin. The 3.53–3.17 Ga East Pilbara Terrane (EP) represents the ancient nucleus of the craton that formed through three distinct mantle plume events at 3.53–3.43, 3.35–3.29 and 3.27–3.24 Ga. Each plume event resulted in eruption of thick dominantly basaltic volcanic successions on older crust to 3.72 Ga, and melting of crust to generate first tonalite‐trondhjemite‐granodiorite (TTG), and then progressively more evolved granitic magmas. In each case, plume magmatism was accompanied by uplift and crustal extension. The combination of conductive heating from below, thermal blanketing from above, and internal heating of buried granitoids during these events led to episodes of partial convective overturn of upper and middle crust. These mantle melting events caused severe depletion of the subcontinental lithospheric mantle, making the EP a stable, buoyant, unsubductable continent by c. 3.2 Ga. Extension accompanying the latest event led to rifting of the protocontinent margins at between 3.2 and 3.17 Ga. After 3.2 Ga, horizontal tectonic forces dominated over vertical forces, as revealed by the geology of the three terranes (Karratha, Sholl and Regal) of the West Pilbara Superterrane. The c. 3.12‐Ga Whundo Group of the Sholl Terrane is a fault bounded, 10‐km‐thick volcanic succession with geochemical characteristics of modern oceanic arcs (including boninites and evidence for flux melting) that indicate steep Archean subduction. At 3.07 Ga, the 3.12‐Ga Sholl Terrane, 3.27‐Ga Karratha Terrane and c. 3.2‐Ga Regal Terrane accreted together and onto the EP during the Prinsep Orogeny. This was followed by development of the De Grey Superbasin – an intracontinental sag basin and widespread plutonism (2.99–2.93 Ga) as a result of orogenic relaxation and slab break off. Craton‐wide compressional deformation at 2.95–2.93 Ga culminated with 2.91‐Ga accretion of the 3.18 Ga Kurrana Terrane with the EP. This compression caused amplification of the dome‐and‐keel structure in the EP. Final cratonization was effected by emplacement of 2.89–2.83 Ga post‐tectonic granites.

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“…Previous workers have interpreted a variety of tectonic settings for parts of the East Pilbara Terrane, including mid-ocean ridge (Ueno et al, 2001;Komiya et al, 2002;Kato and Nakamura, 2003), oceanic island arc (Komiya et al, 2002) and convergent margins involving continental magmatic arcs above subduction zones (e.g., Bickle et al, 1983Bickle et al, , 1993Barley et al, 1984). However, all of these settings are invalidated by the current data.…”

Section: East Pilbara Terrane (353-323 Ga)mentioning

confidence: 74%

Early Earth evolution: evidence from the 3.5–1.8 Ga geological history of the Pilbara region of Western Australia

Hickman¹,

Kranendonk²

2012

Episodes

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Archaean calc-alkaline volcanism in the Pilbara Block, Western Australia

Cited by 43 publications

References 44 publications

Geochemistry and origin of Archean felsic metavolcanic rocks, central Noranda area, Quebec, Canada

Geochemistry and origin of Archean felsic metavolcanic rocks, central Noranda area, Quebec, Canada

Review: secular tectonic evolution of Archean continental crust: interplay between horizontal and vertical processes in the formation of the Pilbara Craton, Australia

Early Earth evolution: evidence from the 3.5–1.8 Ga geological history of the Pilbara region of Western Australia

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