DOI: 10.1016/j.epsl.2017.11.009
Scopus记录号: 2-s2.0-85034234456
论文题名: Late accretion to the Moon recorded in zircon (U–Th)/He thermochronometry
作者: Kelly N.M. ; Flowers R.M. ; Metcalf J.R. ; Mojzsis S.J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 222
结束页码: 235
语种: 英语
英文关键词: (U–Th)/He thermochronometry
; Apollo 14
; bombardment
; Moon
; thermal modeling
; zircon
Scopus关键词: Meteor impacts
; Moon
; Radiation damage
; Silicate minerals
; Temperature
; Apollo 14
; bombardment
; Impact-melt breccias
; Isotopic dating
; Low temperatures
; Thermal model
; Thermochronometry
; Uranium concentration
; Zircon
; accretion
; breccia
; helium isotope
; modeling
; Moon
; thermochronology
; uranium series dating
; zircon
英文摘要: We conducted zircon (U–Th)/He (ZHe) analysis of lunar impact-melt breccia 14311 with the aim of leveraging radiation damage accumulated in zircon over extended intervals to detect low-temperature or short-lived impact events that have previously eluded traditional isotopic dating techniques. Our ZHe data record a coherent date vs. effective Uranium concentration (eU) trend characterized by >3500 Ma dates from low (≤75 ppm) eU zircon grains, and ca. 110 Ma dates for high (≥100 ppm) eU grains. A progression between these date populations is apparent for intermediate (75–100 ppm) eU grains. Thermal history modeling constrains permissible temperatures and cooling rates during and following impacts. Modeling shows that the data are most simply explained by impact events at ca. 3950 Ma and ca. 110 Ma, and limits allowable temperatures of heating events between 3950–110 Ma. Modeling of solar cycling thermal effects at the lunar surface precludes this as the explanation for the ca. 110 Ma ZHe dates. We propose a sample history characterized by zircon resetting during the ca. 3950 Ma Imbrium impact event, with subsequent heating during an impact at ca. 110 Ma that ejected the sample to the vicinity of its collection site. Our data show that zircon has the potential to retain 4He over immense timescales (≥3950 Myrs), thus providing a valuable new thermochronometer for probing the impact histories of lunar samples, and martian or asteroidal meteorites. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110142
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geological Sciences, University of Colorado, 2200 Colorado Avenue, UCB 399, Boulder, CO 80309-0399, United States; Collaborative for Research in Origins (CRiO), The John Templeton Foundation – FfAME Origins Program, United States; Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, 45 Budaörsi Street, Budapest, H-1112, Hungary
Recommended Citation:
Kelly N.M.,Flowers R.M.,Metcalf J.R.,et al. Late accretion to the Moon recorded in zircon (U–Th)/He thermochronometry[J]. Earth and Planetary Science Letters,2018-01-01,482