Combined Hf and Nd isotope microanalysis of co-existing zircon and REE-rich accessory minerals: High resolution insights into crustal processes

Hammerli, Johannes; Kemp, Anthony I.S.

doi:10.1016/j.chemgeo.2021.120393

Cited by 24 publications

(8 citation statements)

References 141 publications

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“…2745, and ca. 2725 Ma, respectively (Figures 9 and 11, Files S3 and S5; see also Hammerli et al, 2018; Hammerli and Kemp (2021)). The meaning of these age groups requires further investigation.…”

Section: Discussionmentioning

confidence: 90%

“…In isolation, these U–Pb dates do not unambiguously constrain the timing of granulite facies metamorphism; however, a Sm–Nd isochron defined by REE‐rich minerals in the same sample suggests that the most recent high‐grade metamorphism to have affected these rocks occurred at ca. 2800 Ma (Hammerli & Kemp, 2021). These data suggest early Neoarchean metamorphism, although the effects of this were apparently not recorded (or preserved) by other samples in this study from the Mt Dugel area (locality 1, Figure 2b).…”

Section: Discussionmentioning

confidence: 99%

“…2620 Ma (refer to Section 7.3). Hammerli et al, 2018;Hammerli and Kemp (2021)). The meaning of these age groups requires further investigation.…”

Section: Metamorphism Before Ca 2720 Mamentioning

confidence: 99%

“…They also provide insights into ancient crustal heat flow and can track the thermal perturbations of the crust as it relates to burial (heating) by subduction, accretion and collision, and exhumation (cooling) over time (e.g., Guevara & Caddick, 2016; Kelsey, 2008; Kelsey & Hand, 2015; Yakymchuk, 2017). In addition, Archean metamorphic rocks can contain evidence of the nature and crustal residence age of their protoliths via a range of radiogenic isotope tracers (e.g., Hf and Nd isotopes; Hammerli & Kemp, 2021; Payne et al, 2016). In this study, we investigate the metamorphic record of the Narryer Terrane in the northwestern Yilgarn Craton, Western Australia, as a proxy for understanding how continental crust evolved and stabilized in the Archean.…”

Section: Introductionmentioning

confidence: 99%

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Ultrahigh thermal gradient granulites in the Narryer Terrane, Yilgarn Craton, Western Australia, provide a window into the composition and formation of Archean lower crust

Tucker,

Hammerli,

Kemp

et al. 2024

Journal Metamorphic Geology

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Granulites from the Narryer Terrane in the northern Yilgarn Craton, Australia, record evidence for high to ultrahigh thermal gradients during the Meso–Neoarchean. U–Pb zircon ages reflect a complex history of high‐grade, prolonged and poly‐phase metamorphism, with evidence for several thermal pulses at ca. 2745–2725, ca. 2690–2660, and ca. 2650–2610 Ma. Forward phase equilibrium modeling on rocks with varying bulk compositions and mineral assemblages suggests that peak temperatures reached 880–920°C at pressures of 5.5–6 kbar at ca. 2690–2665 Ma, followed by near‐isobaric cooling. These new P–T results also indicate that these rocks experienced some of the hottest thermal gradient regimes in the metamorphic record (≥150°C/kbar). Based on P–T models, U–Pb ages, and geochemical constraints, our data suggest that the geodynamic setting for the formation of this unusual thermal regime is ultimately tied to cratonization of the Yilgarn Craton. Previous models have inferred that ultrahigh thermal gradients and coeval large‐scale anatexis in the Narryer Terrane were primarily generated by mantle‐driven processes, despite most of the lithological, isotopic, and geochemical observations being at odds with the expected geological expression of large‐scale mantle upwelling. We re‐evaluate the mechanisms for high‐grade metamorphism in the Narryer terrane and propose that long‐lived high crustal temperatures between ca. 2690 Ma and 2610 Ma were instead facilitated by elevated radiogenic heat production in thickened, highly differentiated ancient crust. Mantle‐derived magma input and new crustal addition may not be the only drivers for high‐ to ultrahigh‐temperature metamorphism and stabilization of ancient crustal blocks.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

“…2620 Ma (refer to Section 7.3). Hammerli et al, 2018;Hammerli and Kemp (2021)). The meaning of these age groups requires further investigation.…”

Section: Metamorphism Before Ca 2720 Mamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultrahigh thermal gradient granulites in the Narryer Terrane, Yilgarn Craton, Western Australia, provide a window into the composition and formation of Archean lower crust

Tucker,

Hammerli,

Kemp

et al. 2024

Journal Metamorphic Geology

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“…Mineral chemical data gathered from the same accessory minerals (Bruand et al, 2014(Bruand et al, , 2020 provide the opportunity to investigate variations in elemental ratios that are key for petrogenetic studies. Earlier studies have demonstrated the potential of using REE-bearing minerals and the Sm-Nd systems in crustal evolution studies (Fisher et al, 2017;Gregory et al, 2009;Hammerli and Kemp, 2021). In particular, Gregory et al (2009) have shown that in-situ Nd isotopes in REE-minerals could faithfully record the source characteristics of a suite of plutons in the Bergell pluton (Italy).…”

Section: Tracking Sediment/crustal Assimilation By Combining Isotopes...mentioning

confidence: 99%

Mineral-whole rock isotope fidelity? A comparative study of Hf-Nd-O from high Ba-Sr granitoids

et al. 2023

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Applications of Neodymium Isotopes to Ore Deposits and Metallogenic Terranes; Using Regional Isotopic Maps and the Mineral Systems Concept

Champion

Huston

2023

Mineral Resource Reviews

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Although radiogenic isotopes historically have been used in ore genesis studies for age dating and as tracers, here we document the use of regional- and continental-scale Sm–Nd isotope data and derived isotopic maps to assist with metallogenic interpretation, including the identification of metallogenic terranes. For the Sm–Nd system, calculated Nd model ages, which are time independent, are of most value for small-scale isotopic maps. Typically, one- or two-stage depleted mantle model ages (TDM, T2DM) are used to infer age when the isotope characteristics of the rock were in isotopic equilibrium with a modelled (mantle) reservoir. An additional advantage is that Nd model ages provide, with a number of assumptions, an estimate of the approximate age of continental crust in a region. Regional- and continental-scale Nd model age maps, constructed from rocks such as granites, which effectively sample the middle to lower crust, therefore, provide a proxy to constrain the nature of the crust within a region. They are of increasing use in metallogenic analysis, especially when combined with a mineral systems approach, which recognizes that mineral deposits are the result of geological processes, at a scales from the ore shoot to the craton. These maps can be used empirically and/or predictively to identify and target large parts of mineral systems that may be indicative, or form part of, metallogenic terranes. Examples presented here include observed spatial relationships between mineral provinces and isotopic domains; the identification of old and/or thick cratonic blocks; determination of tectonic regimes favorable for mineralization; identification of isotopically juvenile zones that may indicate rifts or primitive arcs; recognition of crustal breaks that define metallogenic terrane boundaries or delineate fluid pathways; and, as baseline maps. Of course, any analysis of Sm–Nd and similar isotopic maps are predicated on integration with geological, geochemical and geophysical information data. In the future, research in this area should focus on the spatial and temporal evolution of the whole lithosphere at the province- to global-scales to more effectively targeting mineral exploration. This must involve integration of radiogenic isotopic data with other data, in particular, geophysical data, which has the advantage of being able to directly image the crust and lithosphere and being of a more continuous nature as compared to invariably incomplete isotopic data sets.

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Combined Hf and Nd isotope microanalysis of co-existing zircon and REE-rich accessory minerals: High resolution insights into crustal processes

Cited by 24 publications

References 141 publications

Ultrahigh thermal gradient granulites in the Narryer Terrane, Yilgarn Craton, Western Australia, provide a window into the composition and formation of Archean lower crust

Ultrahigh thermal gradient granulites in the Narryer Terrane, Yilgarn Craton, Western Australia, provide a window into the composition and formation of Archean lower crust

Mineral-whole rock isotope fidelity? A comparative study of Hf-Nd-O from high Ba-Sr granitoids

Applications of Neodymium Isotopes to Ore Deposits and Metallogenic Terranes; Using Regional Isotopic Maps and the Mineral Systems Concept

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