The evolution of Archaean greenstone terrains, Eastern Goldfields Province, Western Australia

Archibald, N. J.; Bettenay, L. F.; Binns, R. A.; Groves, David; Gunthorpe, R.J.

doi:10.1016/0301-9268(78)90008-6

Cited by 140 publications

(16 citation statements)

References 39 publications

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“…As discussed above, a major problem throughout the Yilgarn Block is the apparent scarcity of 2.64-2.63 Ga granitoids that are coeval with gold mineralisation. Preferential erosion of the poorly exposed composite granitoid batholiths (Archibald et al 1981) may be partly responsible for the scarcity of 2.64-2.63 Ga granitoids, as might their greater depth of generation, and possibly emplacement, which is required for the deeper deposits of the continuum. Further geochronology and Pb and Sr isotope studies are required on both granitoids and gold deposits to fully resolve some of the enigmas raised here.…”

Section: Implications For the Genesis Of Arehaean Lode Gold Depositsmentioning

confidence: 98%

An overview of the relationship between granitoid intrusions and gold mineralisation in the Archaean Murchison Province, Western Australia

1993

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Abstract. In the Archaean Murchison Province of Western Australia, granitoid batholiths and plutons that intruded into the ca. 2.7-2.8 Ga and ca. 3.0 Ga greenstone belts can be divided into three major suites. Suite I is a ca. 2.69 Ga monzogranite-granodiorite suite, which was derived from anatexis of old continental crust and occurs as syn-tectonic composite batholiths over the entire province. Suite II is a trondhjemite-tonalite suite (termed Itype) derived from partial melting of subducted basaltic crust, which intruded as syn-to late-tectonic plutons into the greenstone belts in the northeastern part of the province where most of the major gold deposits are situated. One of the Suite II trondhjemite plutons has a Pb-Pb isochron age of 2641 ___ 36 Ma, and one of the structurally youngest tonalite plutons has a minimum Pb-Pb isochron age of 2630.1 _ 4.3 Ma. Suite III is a ca. 2.65-2.62 Ga A-type monzogranite-syenogranite suite which is most abundant in the largely unmineralised southwestern part of the province. Gold deposits in the province are mostly hosted in brittle-ductile shear zones, and were formed at a late stage in the history of metamorphism, deformation and granitoid emplacement. At one locality, mineralisation has been dated at 2636.8 _ 4.2 Ma through a pyritetitanite Pb-Pb isochron. Lead and Sr isotope studies of granitoids and gold deposits indicate that, although most gold deposits have initial Pb isotope compositions most closely similar to those of Suite II intrusions, both Suite I and Suite II intrusions or their source regions could have contributed solutes to the ore fluids. These preliminary data suggest that gold mineralisation in the Murchison Province was temporally and spatially associated with Suite II 1-type granitoids in the northeastern part of the province. This association is consistent with the concept that Archaean gold mineralisation was related to convergent-style tectonic settings, as generation of both Suite II I-type granitoids and hydrothermal ore fluids could have been linked to the dehydration and partial fusion of subducted oceanic crust, and old sialic crust or its anatectic products may also contribute solutes to the ore fluids. Integration of data from this study with other geological and radiogenic isotope constraints in the Yilgarn Block argue against direct derivation of gold ore fluids from specific I-type granitoid plutons, but favour a broad association with convergent tectonics and granitoid magmatism in the late Archaean.

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Section: Implications For the Genesis Of Arehaean Lode Gold Depositsmentioning

confidence: 98%

An overview of the relationship between granitoid intrusions and gold mineralisation in the Archaean Murchison Province, Western Australia

1993

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“…1) [2]. It is equigranular and comprises medium to fine-grained quartz, biotite, muscovite, microcline and plagioclase (predominantly albite), and the accessory minerals zircon, apatite, sphene and late-stage epidote [8].…”

Section: Kambalda Granodioritementioning

confidence: 99%

Geochemical Interactions between Leachants from Actinide-Doped Synroc and Three Australian Granites

Guthrie¹,

Hart²,

Levins³

et al. 1991

Radiochimica Acta

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A study has been undertaken on the interactions of leachates from actinide-doped Synroc and three Australian granites. Leach testing was carried out on Synroc containing 237 Np, 239 Pu and 244 Cm under MCC-1 conditions in close proximity to granite specimens at 70 °C for 28 days.The presence of the granites increased the pH and reduced the total activity released from the Synroc. Preferential uptake of actinides occurred onto specific secondary minerals, especially hematite, other Fe-oxides/hydroxides, leucoxene, sericite, chlorite and clays. The controlling mechanisms for fixation of actinides on the granties appeared to be adsorption, ionic exchange and reduction by Fe(II). The high sorptive capacity of the alteration minerals significantly reduced the concentration of actinides in solution indicating that hydrothermally-altered granites, with a significant proportion of secondary minerals present, are capable of removing actinides from groundwaters.

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“…In a substantial review of metamorphism in the Yilgarn, Binns et al (1976) proposed the evolutionary model elaborated below. Archibald (1979), Archibald, Bettenay, Binns, Groves &Gunthorpe (1978), and Archibald & Bettenay (1977) presented further structural and metamorphic evidence relevant to this model, and we attempt t o quantify the qualitative interpretation of phase relations presented by Archibald (1979) in this paper. Binns er 01.…”

Section: Geology and Metamorphism In The Southeast Yilgarn Blockmentioning

confidence: 95%

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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The evolution of Archaean greenstone terrains, Eastern Goldfields Province, Western Australia

Cited by 140 publications

References 39 publications

An overview of the relationship between granitoid intrusions and gold mineralisation in the Archaean Murchison Province, Western Australia

An overview of the relationship between granitoid intrusions and gold mineralisation in the Archaean Murchison Province, Western Australia

Geochemical Interactions between Leachants from Actinide-Doped Synroc and Three Australian Granites

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

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