globalchange  > 气候变化与战略
DOI: 10.1016/j.earscirev.2019.04.003
论文题名:
Time-space evolution of an Archean craton: A Hf-isotope window into continent formation
作者: Mole D.R.; Kirkland C.L.; Fiorentini M.L.; Barnes S.J.; Cassidy K.F.; Isaac C.; Belousova E.A.; Hartnady M.; Thebaud N.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2019
卷: 196
语种: 英语
中文关键词: Continental crust ; Crustal evolution ; Geochronology ; Plume tectonics ; Subduction ; Yilgarn
英文关键词: Archean ; continental crust ; craton ; crustal evolution ; geochronology ; hafnium ; mantle plume ; spatiotemporal analysis ; subduction ; tectonics ; Australia ; Western Australia ; Yilgarn Block
英文摘要: The Yilgarn Craton of Western Australia represents one of the largest pieces of Precambrian crust on Earth, and a key repository of information on the Meso-Neoarchean period. Understanding the crustal, tectonic, thermal, and chemical evolution of the craton is critical in placing these events into an accurate geological context, as well as developing holistic tectonic models for the Archean Earth. Here, we present a large U-Pb (420 collated samples) and Hf isotopic (2163 analyses) dataset on zircon, and apply it to constrain the evolution of the craton. These data provide strong evidence for a Hadean-Eoarchean origin for the Yilgarn Craton from mafic crust at ca. 4000 Ma, in a proto-craton consisting of the Narryer and north-central Southern Cross Domain. This ancient cratonic nucleus was subsequently rifted, expanded and reworked by successive crustal growth events at ca. 3700 Ma, ca. 3300 Ma, 3000–2900 Ma, 2825–2800 Ma, and ca. 2730–2620 Ma. The <3050 Ma crustal growth events correlate broadly with known komatiite events, and patterns of craton evolution, revealed by Hf isotope time-slice mapping, image the periodic break-up of the Yilgarn proto-continent and the formation of rift-zones between the older crustal blocks. Crustal growth and new magmatic pulses were focused into these zones and at craton margins, resulting in continent growth via internal (rift-enabled) expansion, and peripheral (crustal extraction at craton margins) magmatism. Consequently, we interpret these major geodynamic processes to be analogous to plume-lid tectonics, where the majority of tonalite-trondhjemite-granodiorite (TTG) felsic crust, and later granitic crust, was formed by reworking of hydrated mafic rocks and TTGs, respectively, via a combination of infra-crustal and/or drip-tectonic settings. We argue that subduction-like processes formed a minor tectonic component, re-docking the Narryer Terrane to the craton at ca. 2740 Ma. Overall, these processes led to an intra-cratonic architecture of younger, juvenile terranes located internal and external to older, long-lived, reworked crustal blocks. This framework provided pathways that localized later magmas and fluids, driving the exceptional mineral endowment of the Yilgarn Craton. © 2019
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165887
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作者单位: Mineral Exploration Research Centre, Harquail School of Earth Sciences and Goodman School of Mines, Laurentian University, Sudbury, Ontario P3E 2C6, Canada; Commonwealth Science and Industrial Research Organisation (CSIRO), Mineral Resources, 26 Dick Perry Ave, Kensington, Western Australia 6151, Australia; Australian Research Council (ARC) Centre of Excellence for Core to Crust Fluid Systems (CCFS), Centre for Exploration Targeting, University of Western Australia, Stirling Highway, Crawley, Perth, Western Australia 6009, Australia; School of Earth and Planetary Sciences, Centre for Exploration Targeting Curtin node, Curtin University, Kent Street, Bentley, Perth, Western Australia 6102, Australia; Australian Research Council (ARC) Centre of Excellence for Core to Crust Fluid Systems (CCFS), ARC Key Centre for the Geochemical Evolution and Metallogeny of Continents (GEMOC), Macquarie University, Sydney, North Ryde 2109, Australia

Recommended Citation:
Mole D.R.,Kirkland C.L.,Fiorentini M.L.,et al. Time-space evolution of an Archean craton: A Hf-isotope window into continent formation[J]. Earth Science Reviews,2019-01-01,196
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