Calcium Isotopic Compositions of Normal Mid-Ocean Ridge Basalts From the Southern Juan de Fuca Ridge
文献类型：期刊论文
| 作者 | Zhu, Hongli1; Liu, Fang1,2; Li, Xin1 ; Wang, Guiqin1; Zhang, Zhaofeng1; Sun, Weidong3,4,5
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| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
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| 出版日期 | 2018-02-01 |
| 卷号 | 123期号:2页码:1303-1313 |
| 关键词 | calcium isotopes N-MORB fractional crystallization partial melting mantle heterogeneity |
| ISSN号 | 2169-9313 |
| DOI | 10.1002/2017JB014699 |
| 通讯作者 | Zhang, Zhaofeng(zfzhang@gig.ac.cn) |
| 英文摘要 | Mantle peridotites show that Ca is isotopically heterogeneous in Earth's mantle, but the mechanism for such heterogeneity remains obscure. To investigate the effect of partial melting on Ca isotopic fractionation and the mechanism for Ca isotopic heterogeneity in the mantle, we report high-precision Ca isotopic compositions of the normal Mid-Ocean Ridge Basalts (N-MORB) from the southern Juan de Fuca Ridge. Ca-44/40 of these N-MORB samples display a small variation ranging from 0.750.05 to 0.860.03 (relative to NIST SRM 915a, a standard reference material produced by the National Institute of Standards and Technology), which are slightly lower than the estimated Upper Mantle value of 1.050.04 parts per thousand and the Bulk Silicate Earth (BSE) value of 0.94 +/- 0.05 parts per thousand. This phenomenon cannot be explained by fractional crystallization, because olivine and orthopyroxene fractional crystallization has limited influence on Ca-44/40 of N-MORB due to their low CaO contents, while plagioclase fractional crystallization cannot lead to light Ca isotopic compositions of the residue magma. Instead, the lower Ca-44/40 of N-MORB samples compared to their mantle source is most likely caused by partial melting. The offset in Ca-44/40 between N-MORB and BSE indicates that at least 0.1-0.2 parts per thousand fractionation would occur during partial melting and light Ca isotopes are preferred to be enriched in magma melt, which is in accordance with the fact that Ca-44/40 of melt-depleted peridotites are higher than fertile peridotites in literature. Therefore, partial melting is an important process that can decrease Ca-44/40 in basalts and induce Ca isotopic heterogeneity in Earth's mantle. |
| 资助项目 | National Key R&D Program of China[2016YFC0600408] ; National Natural Science Foundation of China[41773009] ; National Natural Science Foundation of China[41773062] ; National Natural Science Foundation of China[41490632] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000428437500022 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/158471]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Zhang, Zhaofeng |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Oceanog, Ctr Deep Sea Res, Qingdao, Peoples R China 4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China 5.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, Hongli,Liu, Fang,Li, Xin,et al. Calcium Isotopic Compositions of Normal Mid-Ocean Ridge Basalts From the Southern Juan de Fuca Ridge[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2018,123(2):1303-1313. |
| APA | Zhu, Hongli,Liu, Fang,Li, Xin,Wang, Guiqin,Zhang, Zhaofeng,&Sun, Weidong.(2018).Calcium Isotopic Compositions of Normal Mid-Ocean Ridge Basalts From the Southern Juan de Fuca Ridge.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,123(2),1303-1313. |
| MLA | Zhu, Hongli,et al."Calcium Isotopic Compositions of Normal Mid-Ocean Ridge Basalts From the Southern Juan de Fuca Ridge".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 123.2(2018):1303-1313. |
入库方式： OAI收割
来源：海洋研究所
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