中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 岩石圈演化国家重点实验室
Partial melting control of lithium concentrations and isotopes in the Cenozoic lithospheric mantle beneath Jiande area, the Cathaysia block of SE China

文献类型：期刊论文

作者Xiao, Yan1; Zhang, Hong-Fu1,2; Su, Ben-Xun1; Zhu, Bin1; Chen, Bei-Bei3; Chen, Chen1,4; Sakyi, Patrick Asamoah5
刊名CHEMICAL GEOLOGY
出版日期2017-09-05
卷号466页码:750-761
关键词Lithium isotopes Mantle peridotite Partial melting Lithospheric mantle Cathaysia block
ISSN号0009-2541
DOI10.1016/j.chemgeo.2017.07.024
文献子类Article
英文摘要To investigate whether Li isotopic fractionation occurred during high temperature partial melting in the mantle, major and trace element, and Li isotopes were measured in minerals (olivine, Opx, and Cpx) from lherzolite xenoliths entrained in the Jiande Cenozoic basalts in the Cathaysia block. These lherzolites show correlations between Al2O3 and Mg# in Opx and between Fo and Cr# in spinel, indicating they experienced variable degrees of partial melting. Most of them show LREE-depleted patterns in Cpx, indicating little imprint from subsequent incipient metasomatism. The minerals in these lherzolites have narrow Li concentrations (olivine: 1.81-2.82 ppm; Cpx: 0.85-1.85 ppm; Opx: 0.45-1.44 ppm) but variable Li isotopic compositions (olivine: 2.06-10.00 parts per thousand; Cpx: -5.05-3.58 parts per thousand; Opx: -4.11-9.18 parts per thousand). The relative concentrations among the different mineral phases in the Jiande lherzolites (Li-Ol > Li-Cpx >= Li-Opx) are similar to those found in "equilibrated" mantle peridotites. The Li concentrations of olivine are a bit higher than the range of normal mantle (1.0-2.2 ppm). The negative correlations between indices of partial melting (Fo content and Cr# in spinel) and Li concentrations of olivine also implies that partial melting was the main process controlling the variations of olivine Li concentration and it generated depletion in Li concentration of <1 ppm. In addition, the negative correlations between indices of partial melting and delta Li-7 values in olivine also occur. Thus, the observed variable d(7)Li values in olivine could not have been produced by recent diffusive-driven isotopic fractionation, but potentially be explained through variable degree of partial melting of their source. Therefore, partial melting process could account for small but systematic Li isotopic fractionation in the mantle. In contrast to olivine, delta Li-7 values of Cpx and Opx in the Jiande lherzolites are a bit variable. They display isotopically heavy cores and light rims, suggesting a recent diffusive ingress of Li into a crystal from the entraining magma or during related intrusive magmatism. The restricted Li concentration in pyroxenes relative to isotope zonation may suggest faster isotopic self-diffusion relative to elemental diffusion.
WOS关键词PERIDOTITE XENOLITHS ; SOUTH CHINA ; TRACE-ELEMENT ; ULTRAMAFIC XENOLITHS ; SOUTHEASTERN CHINA ; HIGH-TEMPERATURE ; COMPLEX-SYSTEMS ; EASTERN CHINA ; ICP-MS ; LI
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000407861200059
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; 41273020) ; 41273020) ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; 41273020) ; 41273020) ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; 41273020) ; 41273020) ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; 41273020) ; 41273020)
源URL[http://ir.iggcas.ac.cn/handle/132A11/61839]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Xiao, Yan; Sakyi, Patrick Asamoah
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China
3.China Univ Geosci, Sch Earth Sci & Mineral Resources, Beijing 100083, Peoples R China
4.Univ Chinese Acad Sci, Sch Earth Sci, Beijing 100049, Peoples R China
5.Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, POB LG 58, Legon, Accra, Ghana
推荐引用方式
GB/T 7714		 Xiao, Yan,Zhang, Hong-Fu,Su, Ben-Xun,et al. Partial melting control of lithium concentrations and isotopes in the Cenozoic lithospheric mantle beneath Jiande area, the Cathaysia block of SE China[J]. CHEMICAL GEOLOGY,2017,466:750-761.
APA Xiao, Yan.,Zhang, Hong-Fu.,Su, Ben-Xun.,Zhu, Bin.,Chen, Bei-Bei.,...&Sakyi, Patrick Asamoah.(2017).Partial melting control of lithium concentrations and isotopes in the Cenozoic lithospheric mantle beneath Jiande area, the Cathaysia block of SE China.CHEMICAL GEOLOGY,466,750-761.
MLA Xiao, Yan,et al."Partial melting control of lithium concentrations and isotopes in the Cenozoic lithospheric mantle beneath Jiande area, the Cathaysia block of SE China".CHEMICAL GEOLOGY 466(2017):750-761.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。