收藏本站
收藏 | 手机打开
二维码
手机客户端打开本文

Evolution of subcontinental lithospheric mantle beneath eastern China:Re-Os isotopic evidence from mantle xenoliths in Paleozoic kimberlites and Mesozoic basalts

Steven L.Goldstein  
【摘要】:正The ages of subcontinental lithospheric mantle beneath the North China and South China cratons are less well-constrained than the overlying crust.We report Re-Os isotope systematics of mantle xenoliths entrained in Paleozoic kimberlites and Mesozoic basalts from eastern China.Peridotite xenoliths from the Fuxian and Mengyin Paleozoic diamondiferous kimberlites in the North China Craton give Archean Re depletion ages of 2.6-3.2 Ga and melt depletion ages of 2.9-3.4 Ga.No obvious differences in Re and Os abundances,Os isotopic ratios and model ages are observed between spinel-facies and garnet-facies peridotites from both kimberlite localities.The Re-Os isotopic data,together with the PGE concentrations,demonstrate that beneath the Archean continental crust of the eastern North China Craton,Archean lithospheric mantle of spinel- to diamond-facies existed without apparent compositional stratification during the Paleozoic.The Mesozoic and Cenozoic basalt-borne peridotite and pyroxenite xenoliths,on the other hand,show geochemical features indicating metasomatic enrichment,along with a large range of the Re-Os isotopic model ages from Proterozoic to Phanerozoic.These features indicate that lithospheric transformation or refertilization through melt-peridotite interaction could be the primary mechanism for compositional changes during the Phanerozoic,rather than delamination or thermal-mechanical erosion,despite the potential of these latter processes to play an important role for the loss of garnet-facies mantle.A fresh garnet lherzolite xenolith from the Yangtze Block has a Re depletion age of~1.04 Ga,much younger than overlying Archean crustal rocks but the same Re depletion ages as spinel lherzolite xenoliths from adjacent Mesozoic basalts,indicating Neoproterozoic resetting of the Re-Os system in the South China Craton.

知网文化
【相似文献】
中国重要会议论文全文数据库 前10条
1 Steven L.Goldstein;;Evolution of subcontinental lithospheric mantle beneath eastern China:Re-Os isotopic evidence from mantle xenoliths in Paleozoic kimberlites and Mesozoic basalts[A];中国科学院地质与地球物理研究所2008学术论文汇编[C];2009年
2 Richard J.Walker;;Osmium isotopic constraints on the age of lithospheric mantle beneath northeastem China[A];中国科学院地质与地球物理研究所二○○三学术论文汇编·第一卷(地球动力学)[C];2003年
3 ;Melt/rock interaction in remains of refertilized Archean lithospheric mantle in Jiaodong Peninsula,North China Craton:Li isotopic evidence[A];中国科学院地质与地球物理研究所第十届(2010年度)学术年会论文集(上)[C];2011年
4 ;Precisely dating Paleozoic kimberlites in the North China Craton and Hf isotopic constraints on the evolution of the subcontinental lithospheric mantle[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(下)[C];2012年
5 ;A brief review of isotopically light Li-a feature of the enriched mantle?[A];中国科学院地质与地球物理研究所第十届(2010年度)学术年会论文集(上)[C];2011年
6 Eizo Nakamura;Takuya Moriguti;Katsura Kobayashi;;Lithium isotopic systematics of peridotite xenoliths from Hannuoba,North China Craton:Implications for melt-rock interaction in the considerably thinned lithospheric mantle[A];中国科学院地质与地球物理研究所2007学术论文汇编(第二卷)[C];2008年
7 ;Mantle-Derived Fluids Involved in Large-Scale Gold Mineralization,Jiaodong District,China:Constraints Provided by the He-Ar and H-O Isotopic Systems[A];中国科学院地质与地球物理研究所2008学术论文汇编[C];2009年
8 ;Geochemical and isotopic investigation of the Laiwu-Zibo carbonatites from western Shandong Province,China,and implications for their petrogenesis and enriched mantle source[A];中国科学院地质与地球物理研究所二○○四学术论文汇编·第二卷(青藏高原·岩石圈)[C];2004年
9 David A Yuen;Nicola Tosi;;Constraints on Mantle Rheological Parameters from Seismic Imaging and Geodynamical Modelling[A];中国地球物理学会第二十七届年会论文集[C];2011年
10 Eizo Nakamura;;Multistage melt/fluid-peridotite interactions in the refertilized lithospheric mantle beneath the North China Craton:constraints from the Li-Sr-Nd isotopic disequilibrium between minerals of peridotite xenoliths[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(上)[C];2012年
中国博士学位论文全文数据库 前1条
1 童思友;[D];中国海洋大学;2010年
中国硕士学位论文全文数据库 前3条
1 谢志鹏;东北地区上古生界热力学特征研究[D];吉林大学;2010年
2 李杨;俯冲岩石圈形在D“层发生过钙钛矿相变的数值模拟[D];中国科学技术大学;2010年
3 范超;飞秒激光剥蚀多接收等离子体质谱原位微区分析黄铜矿中Pb同位素组成研究[D];西北大学;2012年
中国知网广告投放
 快捷付款方式  订购知网充值卡  订购热线  帮助中心
  • 400-819-9993
  • 010-62982499
  • 010-62783978