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
Enormous Lithium Isotopic Variations of Abyssal Peridotites Reveal Fast Cooling and Melt/Fluid-Rock Interactions

文献类型：期刊论文

作者Liu, Ping-Ping2; Liang, Ju2; Dick, Henry J. B.1; Li, Xian-Hua5; Chen, Qiong4; Zuo, Hao-Yue3; Wu, Jia-Cheng3
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2020-09-01
卷号125期号:9页码:18
ISSN号2169-9313
DOI10.1029/2020JB020393
英文摘要Fast diffusing Li isotopes provide important insights into the "recent" transient events or processes for both modern and ancient times, but questions remain concerning the large Li isotopic variations of mantle peridotites, which greatly hampers their usage as a geochemical tracer. This study investigates in situ Li content and isotopic profiles of the constituent minerals of abyssal peridotites from the Gakkel Ridge and Southwest Indian Ridge. The complicated and large variations of Li isotopic profiles in Clinopyroxene (Cpx) and Orthopyroxene (Opx) indicate Li isotopic disequilibrium at millimeter scale. The negative correlations of a wide range of Li contents (0.5 to 6.5 ppm) and delta Li-7 values (-10 to +20) of olivine, Opx and Cpx grains/relicts, trace element zoning of Cpx, the occurrence of plagioclase, olivine serpentinization along cracks, together with numerical modeling demonstrate the observed Li characteristics to be a manifestation of high-temperature mineral-melt Li diffusion during melt impregnation overprinted by low-temperature mineral-fluid Li diffusion during dissolution and serpentinization. The preservation of the Li isotopic diffusion profiles requires rapid cooling of 0.3-5 degrees C/year after final-stage melt impregnation at the Moho boundary, which is consistent with the low temperature at very slow spreadin g ridges caused by conductive cooling. Compared with the well-studied melt-rock interaction process, our study indicates that low-temperature fluid-rock interaction can induce Li diffusion even in the visibly unaltered mineral relicts of partially altered rocks.
WOS关键词TRACE-ELEMENT ; MELT EXTRACTION ; MANTLE BENEATH ; GAKKEL RIDGE ; HIGH-TEMPERATURE ; FRACTIONATION ; XENOLITHS ; LI ; DIFFUSION ; METASOMATISM
资助项目National Science Foundation of China[41872058] ; U.S. National Science Foundation
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000577119500053
出版者AMER GEOPHYSICAL UNION
资助机构National Science Foundation of China ; National Science Foundation of China ; U.S. National Science Foundation ; U.S. National Science Foundation ; National Science Foundation of China ; National Science Foundation of China ; U.S. National Science Foundation ; U.S. National Science Foundation ; National Science Foundation of China ; National Science Foundation of China ; U.S. National Science Foundation ; U.S. National Science Foundation ; National Science Foundation of China ; National Science Foundation of China ; U.S. National Science Foundation ; U.S. National Science Foundation
源URL[http://ir.iggcas.ac.cn/handle/132A11/98334]  
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Liu, Ping-Ping
作者单位1.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA
2.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing, Peoples R China
3.Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Beijing, Peoples R China
4.Tongji Univ, Sch Ocean & Earth Sci, Shanghai, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Ping-Ping,Liang, Ju,Dick, Henry J. B.,et al. Enormous Lithium Isotopic Variations of Abyssal Peridotites Reveal Fast Cooling and Melt/Fluid-Rock Interactions[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2020,125(9):18.
APA Liu, Ping-Ping.,Liang, Ju.,Dick, Henry J. B..,Li, Xian-Hua.,Chen, Qiong.,...&Wu, Jia-Cheng.(2020).Enormous Lithium Isotopic Variations of Abyssal Peridotites Reveal Fast Cooling and Melt/Fluid-Rock Interactions.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,125(9),18.
MLA Liu, Ping-Ping,et al."Enormous Lithium Isotopic Variations of Abyssal Peridotites Reveal Fast Cooling and Melt/Fluid-Rock Interactions".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 125.9(2020):18.

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。