Early archaean zircon ages from orthogneisses and anorthosites at Mount Narryer, Western Australia

Kinny, Peter D.; Williams, Ian S.; Froude, D. O.; Ireland, Trevor; Compston, W.

doi:10.1016/0301-9268(88)90031-9

Cited by 136 publications

(43 citation statements)

References 21 publications

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“…In the NW corner of the Yilgarn Craton, the Narryer Terrane is by far the oldest crustal block based on Nd isotope data, with T DM 2 ages .3300 Ma and up to c. 3700 Ma (1Nd 29.0 to 24.0) consistent with the occurrence of the oldest granites and mafic magmatic rocks in the Yilgarn Craton (Kinny et al 1988;Nutman et al 1993Nutman et al , 1991.…”

Section: R Mole Et Al 52mentioning

confidence: 77%

Crustal evolution, intra-cratonic architecture and the metallogeny of an Archaean craton

Mole

Fiorentini

Cassidy

et al. 2013

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The generation of the Earth's continental crust modified the composition of the mantle and provided a stable, buoyant reservoir capable of capturing mantle material and ultimately preserving ore deposits. Within the continental crust, lithospheric architecture and associated cratonic margins are a first-order control on camp-scale mineralization. Here we show that the evolving crustal architecture of the Archaean Yilgarn Craton, Western Australia, played a key role in controlling the localization of camp-scale gold, iron and nickel mineralized systems. The age and source characteristics of Archaean lithosphere are heterogeneous in both space and time and are recorded by the varying Nd isotopic signature of crustal rocks. Spatial and temporal variations in isotopic character document the evolution of an intra-cratonic architecture through time, and in doing so map transient lithospheric discontinuities where gold, nickel and iron mineral systems were concentrated. Komatiite-hosted nickel deposits cluster into camps localized within young, juvenile crust at the isotopic margin with older lithosphere; orogenic gold systems are typically localized along major structures within juvenile crust; and banded iron formation (BIF)-hosted iron deposits are localized at the edge of, and within, older lithospheric blocks. Furthermore, this work shows that crustal evolution plays an important role in the development and localization of favourable sources of nickel, gold and iron by controlling the occurrence of thick BIFs, ultramafic lavas and fertile (juvenile) crust, respectively. Fundamentally, this study demonstrates that the lithospheric architecture of a craton can be effectively imaged by isotopic techniques and used to identify regions prospective for camp-scale mineralization.

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Section: R Mole Et Al 52mentioning

confidence: 77%

Crustal evolution, intra-cratonic architecture and the metallogeny of an Archaean craton

Mole

Fiorentini

Cassidy

et al. 2013

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“…The major constituents of the NGC (Fig. 1) are: $3730-3600 Ma Meeberrie Gneiss; $3400-3300 Ma Dugel Gneiss; 3200-1600 Ma metasediments; and $2700-2600 Ma granitoids (Kinny et al, 1988;Myers, 1988;Myers et al, 1990;Nutman et al, 1991;Cavosie et al, 2004;Crowley et al, 2005;Dunn et al, 2005).…”

Section: Geology and Backgroundmentioning

confidence: 97%

“…As outlined by Myers et al (1990) the NGC is comprised of metamorphosed and deformed granitoids with intercalated belts of Archean supracrustal rocks. It hosts the oldest known rocks in Australia, the $3730 Ma metamorphosed anorthosites, gabbros, and ultramafic rocks of the Manfred Complex as well as the oldest components of the Meeberrie Gneiss (Fletcher et al, 1988;Kinny et al, 1988;Nutman et al, 1991). The major constituents of the NGC (Fig.…”

Section: Geology and Backgroundmentioning

confidence: 99%

Thermal events documented in Hadean zircons by ion microprobe depth profiles

Trail¹,

Mojzsis²,

Harrison³

2007

Geochimica et Cosmochimica Acta

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“…Gebauer & Grünenfelder 1979), and iii) composite grains with several growth zones (e.g. Kinney et al 1988). In the studied migmatites, the ages obtained from the mesosome are within the range found in Svecofennian metasediments which have been usually interpreted as a mixture of Proterozoic and Archaean sources (Huhma et al 1991, Claesson et al 1993.…”

Section: U-pb On Zirconmentioning

confidence: 99%

Tectono-metamorphic evolution and timing of the melting processes in the Svecofennian Tonalite-Trondhjemite Migmatite Belt: An example from Luopioinen, Tampere area, southern Finland

Mouri¹,

Korsman²,

Huhma³

1999

Bull Geol Soc Finland

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which is characterized by Kfs-poor leucosomes and borders the former belt in the north. The present paper deals with selected migmatitic rocks from the latter belt. It is aimed to study the temporal and structural relationships of the different leucosome generations, and to establish the pressure-temperature-time paths of this belt.The Tonalite-Trondhjemite Migmatite Belt consists mainly of migmatitic rocks with various types of synorogenic granitoids and minor mafic and ultramafic rocks. The mesosome of the migmatites consist of garnet-sillimanite-biotite-plagioclase-cordierite-quartz assemblages with rare K-feldspar and late andalusite. The oldest leucosomes are dominated by plagioclase and quartz, and the content of K-feldspar increases in later leucosomes. Microtextural analysis in conjunction with THERMOCALC calculations and geothermometry shows that these rocks were metamorphosed at peak conditions of 700-750°C at 4-5 kbar and aH,0 = 0.4-0.7. The formation of cordierite coronas around garnet and the late crystallization of andalusite suggest that the final stage of the P-T history was characterized by decompression and cooling within the andalusite stability field, estimated at 500-650°C and 3-4 kbar.Detailed isotopic dating of mesosome and leucosomes of the migmatites was undertaken by conventional U-Pb analyses on monazite and zircon, Sm-Nd analyses on garnet, and ion probe dating on zircon. The monazites are nearly concordant with an average age of 1878.5±1.5 Ma, and garnet-whole rock analyses show that the concordant leucosomes and the mesosome are coeval within error margins having ages of 1893±40 and 1871114 Ma, respectively. However, garnet in the discordant vein leucosome provides an age of 1843±11 Ma, which is marginally younger than the age of the adjacent mesosome and the concordant leucosome (1877+18 and 1880±23 Ma, respectively) and the age of monazite. Zircons from the studied migmatites display complex zoning structures using SEM-based CL-imaging. Most grains have distinct cores, clearly remnants of original grains. The cores display various types of zoning but oscillatory zon-32 H. Mouri, K. Korsman and H. Huhma ing dominates. The cores are overgrown by one or two thin outer rims that are of two types: i) unzoned outer rim, considered as overgrowth of new zircon during a metamorphic event, and ii) weakly oscillatory zoned rim, considered as typical of magmatic recrystallization. Ion probe dating of cores yielded slightly discordant 207 Pb/ 206 Pb ages of between 2866-2002 Ma, which are interpreted as protolith age. Rims yielded two major age groups: the unzoned rims gave ages of 1872-1886 Ma, whereas the rims with oscillatory zoning yielded ages of 1951-1959 Ma. The youngest age group is consistent with the conventional Sm-Nd dating on garnet and U-Pb dating on monazite and we suggest that the migmatites were metamorphosed at granulite facies conditions at ca. 1880 Ma. The 1951-1959 Ma age group yielded by magmatic zircon rims remains difficult to interpret, but may reflect a magmatic eve...

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Early archaean zircon ages from orthogneisses and anorthosites at Mount Narryer, Western Australia

Cited by 136 publications

References 21 publications

Crustal evolution, intra-cratonic architecture and the metallogeny of an Archaean craton

Crustal evolution, intra-cratonic architecture and the metallogeny of an Archaean craton

Thermal events documented in Hadean zircons by ion microprobe depth profiles

Tectono-metamorphic evolution and timing of the melting processes in the Svecofennian Tonalite-Trondhjemite Migmatite Belt: An example from Luopioinen, Tampere area, southern Finland

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