Zircon Lu–Hf isotopes and granite geochemistry of the Murchison Domain of the Yilgarn Craton: Evidence for reworking of Eoarchean crust during Meso-Neoarchean plume-driven magmatism

Ivanic, Tim J.; Kranendonk, Martin J. Van; Kirkland, Christopher L.; Wyche, Stephen; Wingate, Michael T.D.; Белоусова, Е. А.

doi:10.1016/j.lithos.2012.06.006

Cited by 56 publications

(34 citation statements)

References 41 publications

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“…The older Annean Supersuite (2787-2733 Ma) is dominantly comprised of metamorphosed and deformed tonalite-trondhjemite-granodiorite, that is relatively low in SiO 2 and K 2 O, and high in MgO, and probably was derived from a mid to lower crustal source [20]. The Big Bell Suite (2720-2690 Ma), comprised of tonalite to monzogranite, probably was derived from a mid-crustal source [20] and was emplaced syn-tectonically during the D 3 regional deformation (2710-2660 Ma). The post-tectonic Bald Rock Supersuite (2640-2605 Ma) includes the Walganna Suite of biotite ± muscovite monzogranite to syenogranite and the Wogala Suite of fluorite-bearing alkali granite.…”

Section: Geological Settingmentioning

confidence: 99%

“…These granites are the most fractionated in the Murchison Domain, being relatively high in SiO 2 , Y, Cs, Rb and Th, and low in MgO and Sr, and having comparatively large negative Eu anomalies. They probably were derived from a shallow crustal source [20]. The Wogala Suite alkali granites are a possible source for Li, Be, F, Sn, Ta pegmatites that occur across the region [19,21].…”

Section: Geological Settingmentioning

confidence: 99%

“…Generally, the better emerald mineralisation at Poona is associated with phlogopite schists adjacent to syn-tectonic pegmatites and granodiorite intrusives, that were probably emplaced during regional metamorphism over the period~2710-2660 Ma, and may have been derived from the Big Bell Suite granites [4,19,20]. The Bald Rock Supersuite granites are the most likely source of the post-tectonic Li, Be and Sn-bearing pegmatites at Poona due to their degree of fractionation and shallow crustal source [19,20].…”

Section: Geological Settingmentioning

confidence: 99%

“…The Bald Rock Supersuite granites are the most likely source of the post-tectonic Li, Be and Sn-bearing pegmatites at Poona due to their degree of fractionation and shallow crustal source [19,20]. These conclusions about the timing of pegmatite emplacement and emerald mineralisation have been drawn based on the regional geological framework for the Northern Murchison Domain [19,20]. However, local geochronological data are sparse and a detailed geochronological study of the Poona emerald field is required to resolve timing uncertainties but is beyond the scope of this study.…”

Section: Geological Settingmentioning

confidence: 99%

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Pressure–Temperature–Fluid Constraints for the Poona Emerald Deposits, Western Australia: Fluid Inclusion and Stable Isotope Studies

et al. 2016

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Abstract:Emerald from the deposits at Poona shows micrometre-scale chemical, optical, and cathodoluminescence zonation. This zonation, combined with fluid inclusion and isotope studies, indicates early emerald precipitation from a single-phase saline fluid of approximately 12 weight percent NaCl equivalent, over the temperature range of 335-525 • C and pressures ranging from 70 to 400 MPa. The large range in pressure and temperature likely reflects some post entrapment changes and re-equilibration of oxygen isotopes. Secondary emerald-hosted fluid inclusions indicate subsequent emerald precipitation from higher salinity fluids. Likewise, the δ 18 O-δD of channel fluids extracted from Poona emerald is consistent with multiple origins yielding both igneous and metamorphic signatures. The combined multiple generations of emerald precipitation, different fluid compositions, and the presence of both metamorphic and igneous fluids trapped in emerald, likely indicate a protracted history of emerald precipitation at Poona conforming to both an igneous and a metamorphic origin at various times during regional lower amphibolite to greenschist facies metamorphism over the period~2710-2660 Ma.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Pressure–Temperature–Fluid Constraints for the Poona Emerald Deposits, Western Australia: Fluid Inclusion and Stable Isotope Studies

et al. 2016

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“…A succession of melts resulted in chemical differentiation of the continental crust, and a change from an amphibolitic to a granulitic lower to middle crust (e.g. Fyfe 1973;Ivanic et al 2012). …”

Section: Cratonization and Speculations On Kimberlite Emplacementmentioning

confidence: 99%

Neoarchean Mantle-derived Magmatism within the Repulse Bay Block, Melville Peninsula, Nunavut: Implications for Archean Crustal Extraction and Cratonization

LaFlamme

McFarlane

Corrigan

2015

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SUMMARYThe Repulse Bay block (RBb) of the southern Melville Peninsula, Nunavut, lies within the Rae craton and exposes a large (50,000 km 2 ) area of middle to lower crust. The block is composed of ca. 2.86 Ga and 2.73-2.71 Ga tonalite-trondhjemitegranodiorite (TTG) and granitic gneiss that was derived from an older 3.25 and 3.10 Ga crustal substrate. This period of crustal generation was followed by the emplacement of ca. 2.69-2.66 Ga enderbite, charnockite, and granitoid intrusions with entrained websterite xenoliths. These voluminous batholith-scale bodies (dehydrated and hydrated intrusions), and the associated websterite xenoliths, have similar whole rock geochemical properties, including fractionated light rare earth element (LREE)-heavy (H)REE whole rock patterns and negative Nb, Ti, and Ta anomalies. Dehydrated intrusions and websterite xenoliths also contain similar mineralogy (two pyroxene, biotite, interstitial amphibole) and similar pyroxene trace element compositions. Based on geochemical and mineralogical properties, the two lithologies are interpreted to be related by fractional crystallization, and to be the product of a magmatic cumulate processes. Reworking of the crust in a ca. 2.72 Ga subduction zone setting was followed by ca. 2.69 Ga upwelling of the asthenospheric mantle and the intrusion of massif-type granitoid plutons. Based on a dramatic increase in FeO, Zr, Hf, and LREE content of the most evolved granitoid components from the 2.69-2.66 Ga cumulate intrusion, we propose that those granitoid plutons were in part derived from a metasomatized mantle source enriched by fluids from the subducting oceanic slab that underwent further hybridization (via assimilation) with the crust. Large-scale, mantle-derived Neoarchean sanukitoid-type magmatism played a role in the development of a depleted lower crust and residual sub-continental lithospheric mantle, a crucial element in the preservation of the RBb. RÉSUMÉ

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The ~2730 Ma onset of the Neoarchean Yilgarn Orogeny

et al. 2017

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The timing of the onset of an orogeny is commonly constrained indirectly, because early orogenic structures are rarely exposed or are overprinted. Establishing the onset of an Archean orogeny is considerably more challenging, because of the more fragmented geological record and the general lack of consensus about Archean geodynamics. We combine existing tectonostratigraphic data with new structural and geophysical data sets to establish the onset of the Neoarchean Yilgarn Orogeny (Yilgarn Craton, Western Australia). We show that the surface of the ~2960–2750 Ma deep‐marine Yilgarn greenstone sequence was uplifted, eroded, and unconformably overlain by an ~2730 Ma, syntectonic clastic sequence, deposited in shallow marine to subaerial conditions, and derived from the erosion of the underlying greenstones. This ~2730 Ma regional unconformity predates the oldest known Yilgarn structures; therefore, its tectonic significance is so far unknown. At around the same time, at deeper crustal levels, the ~2728 Ma Yarraquin pluton was being emplaced along an active, large‐scale shear zone network. Our mesostructural and microstructural analysis shows that the bulk of the fabric in the granite and its country rocks developed during pluton emplacement and was largely assisted by magma‐present shearing. Overall, these structures reflect an important event of synemplacement crustal shortening. The regional unconformity and the syndeformational emplacement of the Yarraquin pluton are both expressions of an ~2730 Ma regional deformation event associated with significant crustal thickening, marking the onset of the Neoarchean Yilgarn Orogeny.

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Zircon Lu–Hf isotopes and granite geochemistry of the Murchison Domain of the Yilgarn Craton: Evidence for reworking of Eoarchean crust during Meso-Neoarchean plume-driven magmatism

Cited by 56 publications

References 41 publications

Pressure–Temperature–Fluid Constraints for the Poona Emerald Deposits, Western Australia: Fluid Inclusion and Stable Isotope Studies

Pressure–Temperature–Fluid Constraints for the Poona Emerald Deposits, Western Australia: Fluid Inclusion and Stable Isotope Studies

Neoarchean Mantle-derived Magmatism within the Repulse Bay Block, Melville Peninsula, Nunavut: Implications for Archean Crustal Extraction and Cratonization

The ~2730 Ma onset of the Neoarchean Yilgarn Orogeny

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