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  4. 中国科学院矿产资源研究重点实验室
Micron- to nanoscale characterisation and U-Pb geochronology of zircon from granites of the Samphire Pluton, South Australia

文献类型：期刊论文

作者Domnick, Urs5; Cook, Nigel J.5; Ciobanu, Cristiana L.5; Courtney-Davies, Liam5; Dmitrijeva, Marija5; Verdugo-Ihl, Max R.5; Xu, Jing4,5; Keyser, William5; Slattery, Ashley1; Kennedy, Allen K.2
刊名PRECAMBRIAN RESEARCH
出版日期2020-11-01
卷号350页码:16
ISSN号0301-9268
关键词Samphire Pluton Zircon U-Pb geochronology Zircon chemistry HAADF STEM
DOI10.1016/j.precamres.2020.105924
英文摘要Zircons from three distinct granites within the Samphire Pluton, South Australia, are characterised at the micronto nanoscale. Sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon dating generated (207)pb/(206)pb weighted average ages of 1586 +/- 9.3 Ma, 1583.2 +/- 8.5 Ma and 1578 +/- 9.5 Ma, respectively. Although zircons from all three granites display evidence of hydrothermal overprinting, this is most strongly expressed in a distinct, red-colored granite referred to here as Granite C. Alteration is expressed as variation in the concentrations of HREE + Y, Th and Pb, whereby grain margins are relatively enriched in these elements and both Zr and Si are depleted. Altered zircon cores have high U contents relative to grain margins, which are appreciably poorer in this element, whereas Th is strongly enriched within crosscutting microfractures. Coupled with the relative enrichment in non-formula elements and marked disturbance of U-Th-Pb isotope ratios, the nanoscale observations of Pb-bearing nanoparticles (galena?) implying mobility of Pb and other elements, nanofractures and structural defects demonstrate that zircon in Granite C has undergone multi-stage alteration impacting upon accurate dating. Importantly, and with implications for analogous systems elsewhere, our results confirm nanoscale open system U-Pb behaviour in Hiltaba Suite zircon. SHRIMP U-Pb zircon geochronology cannot confidently resolve any statistical differences in the age of the three granites, despite their distinct appearance suggesting they might represent temporally distinct phases of a larger magmatic system. Zircons within the most altered Granite (C), directly underlying the Blackbush uranium prospect contain convincing micron- to nanoscale evidence for an alteration event that triggered a remobilisation of uranium from granite into the cover sequence.
WOS关键词GAWLER CRATON ; CONSTRAINTS ; NANOSPHERES
资助项目Carthew Family Trust ; Australian Research Council Research Hub for Australian Copper Uranium[IH130200033] ; 'FOX' project ; BHP Olympic Dam ; South Australian Government Mining and Petroleum Services Centre of Excellence
WOS研究方向Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:000589423600036
资助机构Carthew Family Trust ; Carthew Family Trust ; Australian Research Council Research Hub for Australian Copper Uranium ; Australian Research Council Research Hub for Australian Copper Uranium ; 'FOX' project ; 'FOX' project ; BHP Olympic Dam ; BHP Olympic Dam ; South Australian Government Mining and Petroleum Services Centre of Excellence ; South Australian Government Mining and Petroleum Services Centre of Excellence ; Carthew Family Trust ; Carthew Family Trust ; Australian Research Council Research Hub for Australian Copper Uranium ; Australian Research Council Research Hub for Australian Copper Uranium ; 'FOX' project ; 'FOX' project ; BHP Olympic Dam ; BHP Olympic Dam ; South Australian Government Mining and Petroleum Services Centre of Excellence ; South Australian Government Mining and Petroleum Services Centre of Excellence ; Carthew Family Trust ; Carthew Family Trust ; Australian Research Council Research Hub for Australian Copper Uranium ; Australian Research Council Research Hub for Australian Copper Uranium ; 'FOX' project ; 'FOX' project ; BHP Olympic Dam ; BHP Olympic Dam ; South Australian Government Mining and Petroleum Services Centre of Excellence ; South Australian Government Mining and Petroleum Services Centre of Excellence ; Carthew Family Trust ; Carthew Family Trust ; Australian Research Council Research Hub for Australian Copper Uranium ; Australian Research Council Research Hub for Australian Copper Uranium ; 'FOX' project ; 'FOX' project ; BHP Olympic Dam ; BHP Olympic Dam ; South Australian Government Mining and Petroleum Services Centre of Excellence ; South Australian Government Mining and Petroleum Services Centre of Excellence
源URL[http://ir.iggcas.ac.cn/handle/132A11/99882]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Cook, Nigel J.
作者单位1.Univ Adelaide, Adelaide Microscopy, Adelaide, SA 5005, Australia
2.Curtin Univ, John de Laeter Ctr, Bentley, WA 6102, Australia
3.Samphire Uranium Pty Ltd, 28 Greenhill Rd, Wayville, SA 5034, Australia
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
5.Univ Adelaide, Sch Chem Engn & Adv Mat, Adelaide, SA 5005, Australia
推荐引用方式
GB/T 7714		 Domnick, Urs,Cook, Nigel J.,Ciobanu, Cristiana L.,et al. Micron- to nanoscale characterisation and U-Pb geochronology of zircon from granites of the Samphire Pluton, South Australia[J]. PRECAMBRIAN RESEARCH,2020,350:16.
APA Domnick, Urs.,Cook, Nigel J..,Ciobanu, Cristiana L..,Courtney-Davies, Liam.,Dmitrijeva, Marija.,...&Bluck, Russel.(2020).Micron- to nanoscale characterisation and U-Pb geochronology of zircon from granites of the Samphire Pluton, South Australia.PRECAMBRIAN RESEARCH,350,16.
MLA Domnick, Urs,et al."Micron- to nanoscale characterisation and U-Pb geochronology of zircon from granites of the Samphire Pluton, South Australia".PRECAMBRIAN RESEARCH 350(2020):16.

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来源：地质与地球物理研究所

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