DOI: 10.1016/j.epsl.2019.115953
论文题名: Find a match with triple-dating: Antarctic sub-ice zircon detritus on the modern shore of Western Australia
作者: Kirkland C.L. ; Barham M. ; Danišík M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 531 语种: 英语
中文关键词: Antarctica
; detrital
; geochronology
; Gondwana
; provenance
; zircon
英文关键词: Binary alloys
; Geochronology
; Hafnium alloys
; Isotopes
; Lead alloys
; Lutetium alloys
; Silicate minerals
; Thorium alloys
; Trace elements
; Zircon
; Antarctica
; Crystallization age
; detrital
; Geodynamic setting
; Gondwana
; provenance
; Sediment processing
; Temporal constraints
; Uranium alloys
英文摘要: In this work we present a novel zircon triple-dating approach (Lu-Hf – U-Pb – (U-Th)/He), complimented with grain shape and trace element chemistry to test models of trans-continental transport of ultimately Gondwana interior derived detritus. Our integrated fingerprinting approach on single zircon grains provides the opportunity for robust source correlations as each isotopic system provides temporal constraints on distinct geological processes, ranging from source age (Lu-Hf), through crystallization age (U-Pb) to exhumation age ((U-Th)/He). Collectively, this detailed level of grain characterisation is much more diagnostic of source region than any single tracer alone, and together with grain shape, helps to constrain intermediate detrital grain histories between source and sink. Applying this approach to an enigmatic detrital zircon population from a modern beach sand on the south coast of Western Australia reveals a dominant 700-500 Ma U-Pb component, with a bimodal Hf-isotope composition and Silurian (U-Th)/He cooling age, all of which is strongly correlated with inferred sub-ice basement of East Antartica and the geodynamic setting of unexposed components of the Kuunga Orogen. Our work points towards multicycle sediment processing, and ongoing reworking of poorly known supra-Yilgarn Craton vestiges of Antarctica-derived sediment that became isolated during Cretaceous break-up of East Gondwana. Furthermore, Hf isotopes in these zircon grains suggest that the Kuunga Orogen in Antarctica was rooted on Archean crust. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165078
Appears in Collections: 气候变化与战略
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作者单位: Centre for Exploration Targeting - Curtin Node, School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; GeoHistory Facility, John de Laeter Center, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
Recommended Citation:
Kirkland C.L.,Barham M.,Danišík M.. Find a match with triple-dating: Antarctic sub-ice zircon detritus on the modern shore of Western Australia[J]. Earth and Planetary Science Letters,2020-01-01,531