Sm‐Nd and Rb‐Sr dating of Archaean gneisses, eastern Yilgarn Block, Western Australia

McCulloch, Malcolm T.; Compston, W.; Froude, D. O.

doi:10.1080/00167618308729242

Cited by 35 publications

(3 citation statements)

References 17 publications

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“…1969;Stowe, 1974;Coward, Lintern & Wright, 1976;Bickle, Bettenay, Boulter, Groves & Morant, 1980;Poulson, Borradaile & Kehlenbeck, 1980;de Wit, 1982). Pb isotopic data (Bickle, Chapman, Bettenay, Groves & de Laeter, 1983) are consistent with the postulate of Bettenay (1977) that voluminous syntectonic granitoids were derived by partial melting of an older more highly deformed gneissic crust at the peak of metamorphism (at 2730Ma in the Diemals area 300 km to the northwest), although the temporal relations of the source gneissic crust and volcanic-sedimentary greenstone sequences are still not resolved (Archibald & Bettenay, 1977;McCulloch, Compston & Froude, 1983). Binns et al (1976) and noted that the metamorphic evolution is apparently unlike any younger orogenic area and may relate to tectonic processes unique to the Archaean.…”

Section: Geology and Metamorphism In The Southeast Yilgarn Blocksupporting

confidence: 58%

Chloritoid and staurolite stability: implications for metamorphism in the Archaean Yilgarn Block, Western Australia

Bickle

Archibald

1984

Journal Metamorphic Geology

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The stability of 'quartz-chloritoidstaurolite-almandine-cordierite and aluminium silicates is used to constrain both metamorphic conditions and pressure-temperature trajectories for two localities within the 2700 Ma Archaean Yilgarn Block in Western Australia. Available experimental data are used to calculate thermodynamic data for a self-consistent set of equilibria between these minerals. A lower amphibolite facies locality from the margin of a lower strain area contains assemblages including quartzchloritoid-staurolite-garnet-biotite with altered cordierite replacing chloritoid, quartz-stauroliteandalusite, and quartz-cordierite-andalusitebiotite. This locality was heated to 530-560 "C in the andalusite field, at 4.2 kbar. A sample from a mid-to upper-amphibolite facies, highly strained locality contains relict staurolite enclosed by andalusite, in turn replaced by cordierite and muscovite with biotite and sillimanite in the matrix. The assemblage was heated isobarically from conditions near the maximum experienced by the lower grade locality of 560°C at 4.2kbar to temperatures in excess of the andalusitesillimanite transition but within the quartz plus muscovite stability field (6OM50"C). The higher grade locality is close to a granitoid dome and sections based on gravity profiles reveal that this locality is underlain by granitoid at shallow depths. The higher grade metamorphism apparently reflects superposition of the thermal aureole on regional metamorphic conditions similar to those in the lower grade areas.

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Section: Geology and Metamorphism In The Southeast Yilgarn Blocksupporting

confidence: 58%

Chloritoid and staurolite stability: implications for metamorphism in the Archaean Yilgarn Block, Western Australia

Bickle

Archibald

1984

Journal Metamorphic Geology

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“…report an apparent age of 2672 ± 7 Ma for the Theatre Rocks mass, but note that is not possible to resolve two probable populations having ages -2660 and -2680 Ma. This sample contains xenocrystic zircon with an age -2800 Ma, as does the Widgiemooltha Monzogranite to the N; this is equal to the inferred ages of banded gneisses spatially associated with the Pioneer and Horse Rocks domes obtained by the Rb-Sr and Sm-Nd total-rock methods (McCulloch et al 1983).…”

Section: Granites and Granodiorites Associated With "Gneiss Domes"mentioning

confidence: 69%

Late Archaean granites of the southeastern Yilgarn Block, Western Australia: age, geochemistry, and origin

Hill

Chappell

Campbell

1992

Earth and Environmental Science Transactions of the Royal Socie

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Late Archaean granitic rocks from the southern Yilgarn Craton of Western Australia have a close temporal relationship to the basaltic and komatiitic volcanism which occurs within spatially associated greenstone belts. Greenstone volcanism apparently began ∼2715 Ma ago, whereas voluminous felsic magmatism (both extrusive and intrusive) began about 2690 Ma ago. A brief but voluminous episode of crust-derived magmatism ∼2690-2685 Ma ago resulted in the emplacement of a diverse assemblage of plutons having granodioritic, monzogranitic and tonalitic compositions. This early felsic episode was followed immediately by the emplacement of mafic sills, and, after a further time delay, by a second episode of voluminous crust-derived magmatism dominated by monzogranite but containing plutons covering a wide compositional range, including diorite, granodiorite and tonalite. The products of this 2665–2660 Ma magmatic episode now form a significant fraction of the exposed southern Yilgarn Craton. Later magmatism, which continued to at least 2600 Ma ago, appears largely restricted to rocks having unusually fractionated compositions.The magmatic sequence basalt-voluminous crust-derived magmatism-later diverse magmatism, is interpreted in terms of a dynamically-based model for the ascent of the head of a new mantle plume. In this model basalts and komatiites are derived by decompression melting of rising plume material, and the crust-derived magmas result after conductive transport of heat from the top of the plume head into overlying continental crust. This type of magmatic evolution, the fundamentally bimodal nature of the magmatism, the presence of high-Mg volcanics (komatiites), and the areal extent of the late Archaean magmatic event, are all suggested to be characteristic of crustal reworking above mantle plumes rather than resulting from other processes, such as those related to subduction.

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“…report an apparent age of 2672 ± 7 Ma for the Theatre Rocks mass, but note that is not possible to resolve two probable populations having ages -2660 and -2680 Ma. This sample contains xenocrystic on June 18, 2015 specialpapers.gsapubs.org Downloaded from zircon with an age -2800 Ma, as does the Widgiemooltha Monzogranite to the N; this is equal to the inferred ages of banded gneisses spatially associated with the Pioneer and Horse Rocks domes obtained by the Rb-Sr and Sm-Nd total-rock methods (McCulloch et al 1983).…”

Section: Granites and Granodiorites Associated With "Gneiss Domes"mentioning

confidence: 78%

Late Archaean granites of the southeastern Yilgarn Block, Western Australia: age, geochemistry, and origin

Hill¹,

Chappell²,

Campbell³

1992

Geological Society of America Special Papers

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Late Archaean granitic rocks from the southern Yilgarn Craton of Western Australia have a close temporal relationship to the basaltic and komatiitic volcanism which occurs within spatially associated greenstone belts. Greenstone volcanism apparently began -2715 Ma ago, whereas voluminous felsic magmatism (both extrusive and intrusive) began about 2690 Ma ago. A brief but voluminous episode of crust-derived magmatism -2690-2685 Ma ago resulted in the emplacement of a diverse assemblage of plutons having granodioritic, monzogranitic and tonalitic compositions. This early felsic episode was followed immediately by the emplacement of mafic sills, and, after a further time delay, by a second episode of voluminous crust-derived magmatism dominated by monzogranite but containing plutons covering a wide compositional range, including diorite, granodiorite and tonalite. The products of this 2665-2660 Ma magmatic episode now form a significant fraction of the exposed southern Yilgarn Craton. Later magmatism, which continued to at least 2600 Ma ago, appears largely restricted to rocks having unusually fractionated compositions.The magmatic sequence basalt-voluminous crust-derived magmatism-later diverse magmatism, is interpreted in terms of a dynamically-based model for the ascent of the head of a new mantle plume. In this model basalts and komatiites are derived by decompression melting of rising plume material, and the crust-derived magmas result after conductive transport of heat from the top of the plume head into overlying continental crust. This type of magmatic evolution, the fundamentally bimodal nature of the magmatism, the presence of high-Mg volcanics (komatiites), and the areal extent of the late Archaean magmatic event, are all suggested to be characteristic of crustal reworking above mantle plumes rather than resulting from other processes, such as those related to subduction.

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Sm‐Nd and Rb‐Sr dating of Archaean gneisses, eastern Yilgarn Block, Western Australia

Cited by 35 publications

References 17 publications

Chloritoid and staurolite stability: implications for metamorphism in the Archaean Yilgarn Block, Western Australia

Chloritoid and staurolite stability: implications for metamorphism in the Archaean Yilgarn Block, Western Australia

Late Archaean granites of the southeastern Yilgarn Block, Western Australia: age, geochemistry, and origin

Late Archaean granites of the southeastern Yilgarn Block, Western Australia: age, geochemistry, and origin

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