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- W2023286610 abstract "The Timbarra Tablelands pluton is an extensive (∼550 km 2 ) complexly zoned intrusion forming one of many predominantly monzogranite I‐type plutons, which constitute the Moonbi Supersuite in northern New South Wales, Australia. It comprises an outer rim of Rocky River monzogranite (Zones 1–3), an intermediate zone of Sandy Creek syenogranite (Zones 4A−4C), surrounding a core of Surface Hill syenogranite (Zones 5–7). The suite is calc‐alkaline, high‐K, and varies from mildly metaluminous to weakly peraluminous with increasing fractionation. Average Rb/Sr ratios range from 0.4 in the least evolved very coarse‐grained monzogranite (Zone 3) to 46 in the most evolved very fine‐grained biotite microgranite (Zone 6). Trace‐element modelling indicates that the observed compositional variation could have been produced by crystal fractionation. New bulk rock major‐ and trace‐element data for 71 samples are presented, and indicate that a compositional continuum exists that varies between 63 and 78 wt% SiO 2 . Importantly, there is no systematic chemical variation with spatial distribution of samples from the core of the pluton to its margin, requiring multiple separate pulses of an evolving magma to explain compositional discontinuities. The pluton is interpreted to have been emplaced at mesozonal levels (∼180 ± 60 MPa, 5–10 km depth) and crystallised at temperatures between 620 and 820°C under moderately oxidising conditions (log f O 2 = −11.5 to −19). The association of gold–molybdenite mineralisation at Timbarra with moderately oxidised I‐type magmas is consistent with fractionation–redox controls on ore‐element behaviour in magmatic systems in other studies." @default.
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- W2023286610 date "2004-06-01" @default.
- W2023286610 modified "2023-10-15" @default.
- W2023286610 title "Textural, mineralogical and geochemical variation in the zoned Timbarra Tablelands pluton, New South Wales*" @default.
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- W2023286610 doi "https://doi.org/10.1111/j.1400-0952.2004.01064.x" @default.
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