DOI: 10.1007/s00531-014-1074-x
Scopus记录号: 2-s2.0-84920829938
论文题名: Hf–Zr anomalies in clinopyroxene from mantle xenoliths from France and Poland: implications for Lu–Hf dating of spinel peridotite lithospheric mantle
作者: Downes H. ; de Vries C. ; Wittig N.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 104, 期: 1 起始页码: 89
结束页码: 102
语种: 英语
英文关键词: Clinopyroxene
; France
; Lu–Hf geochronology
; Mantle
; Poland
; Spinel peridotite
Scopus关键词: clinopyroxene
; dating method
; geochronology
; hafnium
; lutetium
; mantle structure
; peridotite
; spinel
; xenolith
; zircon
; Czech Republic
; France
; Lower Silesia
; Massif Central
; Poland
; Silesia
英文摘要: Clinopyroxenes in some fresh anhydrous spinel peridotite mantle xenoliths from the northern Massif Central (France) and Lower Silesia (Poland), analysed for a range of incompatible trace elements by laser ablation inductively coupled plasma mass spectrometry, show unusually strong negative anomalies in Hf and Zr relative to adjacent elements Sm and Nd, on primitive mantle-normalised diagrams. Similar Zr–Hf anomalies have only rarely been reported from clinopyroxene in spinel peridotite mantle xenoliths worldwide, and most are not as strong as the examples reported here. Low Hf contents give rise to a wide range of Lu/Hf ratios, which over geological time would result in highly radiogenic εHf values, decoupling them from εNd ratios. The high 176Lu/177Hf could in theory produce an isochronous relationship with 176Hf/177Hf over time; an errorchron is shown by clinopyroxene from mantle xenoliths from the northern Massif Central. However, in a review of the literature, we show that most mantle spinel peridotites do not show such high Lu/Hf ratios in their constituent clinopyroxenes, because they lack the distinctive Zr–Hf anomaly, and this limits the usefulness of the application of the Lu–Hf system of dating to garnet-free mantle rocks. Nevertheless, some mantle xenoliths from Poland or the Czech Republic may be amenable to Hf-isotope dating in the future. © 2014, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84920829938&doi=10.1007%2fs00531-014-1074-x&partnerID=40&md5=08403368ba0f00ca7ed33a8e04abb08f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70478
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth and Planetary Sciences, Birkbeck University of London, Malet Street, London, United Kingdom; Department of Earth Sciences, Carleton University, Ottawa, ON, Canada
Recommended Citation:
Downes H.,de Vries C.,Wittig N.. Hf–Zr anomalies in clinopyroxene from mantle xenoliths from France and Poland: implications for Lu–Hf dating of spinel peridotite lithospheric mantle[J]. International Journal of Earth Sciences,2014-01-01,104(1)