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Multi-aliquot method for determining (U + Th)/He ages of hydrothermal hematite: Returning to Elba
Li-Yan Wu; Finlay M. Stuart; Luigia Di Nicola; Matthew Heizler; Marco Benvenuti; Rui-Zhong Hu
2019
发表期刊Chemical Geology
卷号504页码:151-157
摘要

We have used a multi-aliquot method to obtain precise (U + Th)/He ages of hydrothermal hematite and to assess the extent to which He loss from fine-grained hematite caused by diffusion and recoil. Hematite (n = 6) from the Rio Marina mine, Elba (Italy) yields (U + Th)/He ages that range from 5.36 ± 0.33 to 5.64 ± 0.11 Ma, giving a weighted mean age of 5.53 ± 0.14 Ma and an isochron age of 5.25 ± 0.20 Ma. 40Ar/39Ar data from cogenetic adularia yield flat age spectra with analytically indistinguishable plateau ages (5.575 ± 0.008 and 5.583 ± 0.013 Ma). An additional adularia has a more complex spectrum and yields an interpreted age of 5.64 ± 0.03 Ma. The hematite (U + Th)/He ages overlap the 40Ar/39Ar ages, albeit they are less precise (2–6% vs. 0.2–0.5%). This indicates that the loss of in situ radiogenic 4He from complex fine-grained hematite, either by diffusion and recoil, is insignificant. The study shows that multi-aliquot method has the potential to reliably deliver precise and accurate ages for iron oxide mineralisation that has not suffered significant post-crystallisation thermal perturbation.

关键词(u + th)/he hematite 40ar/39ar adularia elba
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10920
专题矿床地球化学国家重点实验室
通讯作者Li-Yan Wu
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.Isotope Geosciences Unit, Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride G75 0QF, UK
3.New Mexico Bureau of Geology, Socorro, NM 87801, USA
4.Department of Earth Sciences, University of Florence, 50121 Florence, Italy
5.College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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GB/T 7714
Li-Yan Wu,Finlay M. Stuart,Luigia Di Nicola,et al. Multi-aliquot method for determining (U + Th)/He ages of hydrothermal hematite: Returning to Elba[J]. Chemical Geology,2019,504:151-157.
APA Li-Yan Wu,Finlay M. Stuart,Luigia Di Nicola,Matthew Heizler,Marco Benvenuti,&Rui-Zhong Hu.(2019).Multi-aliquot method for determining (U + Th)/He ages of hydrothermal hematite: Returning to Elba.Chemical Geology,504,151-157.
MLA Li-Yan Wu,et al."Multi-aliquot method for determining (U + Th)/He ages of hydrothermal hematite: Returning to Elba".Chemical Geology 504(2019):151-157.
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