DOI: 10.1016/j.epsl.2017.12.017
Scopus记录号: 2-s2.0-85038926804
论文题名: Tracking Hadean processes in modern basalts with 142-Neodymium
作者: Horan M.F. ; Carlson R.W. ; Walker R.J. ; Jackson M. ; Garçon M. ; Norman M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 484 起始页码: 184
结束页码: 191
语种: 英语
英文关键词: 142Nd
; Hadean differentiation
; Hawaii
; mantle heterogeneity
; ocean island basalt
; Samoa
Scopus关键词: Financial data processing
; Silicates
; Tectonics
; Hawaii
; Mantle heterogeneity
; Ocean island basalts
; Samoa
; ^142Nd
; Basalt
; Hadean
; isotopic fractionation
; mantle structure
; neodymium isotope
; ocean island basalt
; silicate
; Hawaiian Islands
; Samoa
英文摘要: The short-lived Sm146→142Nd isotope system (t1/2=103 Ma) provides constraints on the timing and processes of terrestrial silicate fractionation during the early Hadean. Although some Archean terranes preserve variability in 142Nd/144Nd, no anomalies have been resolved previously in young rocks. This study provides high precision 142Nd/144Nd data on a suite of ocean island basalts from Samoa and Hawaii previously shown to have variable depletions in 182W/184W that are inversely correlated with 3He/4He ratios. Improved analytical techniques and multiple replicate analyses of Nd show a variation in μ142Nd values between −1.3 and +2.7 in the suite, relative to the JNdi standard. Given the reproducibility of the standard (±2.9 ppm, 2 SD), two Samoan samples exhibit resolved variability in their 142Nd/144Nd ratios outside of their 95% confidence intervals, suggesting minor variability in the Samoan hotspot. One sample from Samoa has a higher μ142Nd of +2.7, outside the 95% confidence interval (±1.0 ppm) of the average of the JNdi standard. Limited, but resolved, variation in 142Nd/144Nd within the suite suggests the preservation of early Hadean silicate differentiation in the sources of at least some basalts from Samoa. Larger variations of 182W/184W and 3He/4He ratios in the same samples suggest that metal–silicate separation and mantle outgassing left a more persistent imprint on the accessible mantle compared to 142Nd/144Nd ratios which are impacted by early silicate differentiation. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110048
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 Terrestrial Magnetism, Carnegie Institution for Science, 5241 Broad Branch RoadNW 20015, United States; Department of Geology, University of Maryland, College Park, MD 20742, United States; Department of Earth Science, University of California, Santa Barbara, CA 93106, United States; ETH Zürich, Department of Earth Sciences, Institute of Geochemistry and Petrology, Clausiusstrasse 25, Zürich, 8092, Switzerland; Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia
Recommended Citation:
Horan M.F.,Carlson R.W.,Walker R.J.,et al. Tracking Hadean processes in modern basalts with 142-Neodymium[J]. Earth and Planetary Science Letters,2018-01-01,484