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Calcium isotopic fractionation during magma differentiation: Constraints from volcanic glasses from the eastern Manus Basin
Zhu, Hongli1,2,3; Liao, Renqiang1,2,3; Liu, He1,2,3; Du, Long4; Li, He1,2,3; Li, Congying1,2,3; Zhang, Zhaofeng5; Sun, Weidong1,2,3,6
2021-07-15
发表期刊GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
卷号305页码:228-242
通讯作者Li, Congying(licongying@qdio.ac.cn) ; Zhang, Zhaofeng(zzf@cdut.edu.cn)
摘要To better constrain Ca isotopic fractionation during volcanic magma differentiation, we report Ca isotope data for a series of volcanic glasses from the eastern Manus Basin that represent a continuum of compositions comprising basaltic andesite, andesite, dacite, and rhyolite. Our results show that these volcanic glasses exhibit similar to 0.25 parts per thousand variation in Ca isotopic compositions, with delta Ca-44/40 ranging from 0.81 +/- 0.04 to 1.05 +/- 0.04 parts per thousand. The similar trace element patterns and Sr-Nd isotopic compositions exclude source heterogeneity as the cause of the varied Ca isotopic compositions. Due to their low K/Ca ratios and young age, the Ca isotopic variations cannot be attributed to K-40 decay. Instead, the observed Ca isotopic variations are primarily controlled by their lithology. Specifically, delta Ca-44/40 of basaltic andesite (0.81 +/- 0.04) and andesite (0.82 +/- 0.01) are similar to the averages of reported mid-ocean ridge basalts (MORBs; 0.84 +/- 0.10; 2SD, N = 26) and back-arc basin basalts (BABBs; 0.80 +/- 0.08; 2SD, N = 21) in literature, but do not correlate with SiO2 or MgO contents, indicating the Ca isotopic fractionation is insignificant during intermediate-mafic magma evolution. As magma differentiation continues, delta Ca-44/40 of dacite and rhyolite evolves from 0.85 +/- 0.01 to 1.05 +/- 0.04 parts per thousand. Moreover, delta Ca-44/40 of felsic glasses are negatively correlated with Eu/Eu*, which suggests that the increasing delta Ca-44/40 of felsic glasses is most likely related to plagioclase (Pl) fractional crystallization. Therefore, we conclude that Ca isotopes can behave differently at different stages of volcanic magma differentiation. Modeling of fractional crystallization using rhyolite-MELTS shows that the relative Ca fractions in crystallized minerals (e.g., Pl vs. Cpx) and the Ca isotopic fractionation factor between the residual melt and crystallized Pl (alpha(melt-Pl), which is likely related to the An number of Pl, magma temperature and kinetic effects during crystallization), provide a plausible explanation for the behavior of Ca isotopes during volcanic magma differentiation. (C) 2021 Elsevier Ltd. All rights reserved.
关键词Calcium isotopes Isotopic fractionation Magma differentiation Felsic The eastern Manus Basin
DOI10.1016/j.gca.2021.05.032
收录类别SCI
语种英语
资助项目National Natural Science Foundation of China[41773009] ; National Natural Science Foundation of China[41873002] ; National Natural Science Foundation of China[41473029] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB4202030301] ; National Key P&D Program of China[2016YFC0600408] ; Qingdao National Laboratory for Marine Science and Technology[2017SDTCPOS07] ; Qingdao National Laboratory for Marine Science and Technology[2017SDKJ02] ; Taishan Scholar Program of Shandong[ts201712075]
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000660120900012
出版者PERGAMON-ELSEVIER SCIENCE LTD
引用统计
被引频次:15[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/176865
专题深海极端环境与生命过程研究中心
通讯作者Li, Congying; Zhang, Zhaofeng
作者单位1.Chinese Acad Sci, Inst Oceanog, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
2.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China
4.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Peoples R China
5.Chengdu Univ Technol, Coll Geosci, Int Ctr Planetary Sci, Chengdu 610059, Peoples R China
6.Univ Chinese Acad Sci, Beijing 100094, Peoples R China
第一作者单位中国科学院海洋研究所
通讯作者单位中国科学院海洋研究所
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Zhu, Hongli,Liao, Renqiang,Liu, He,et al. Calcium isotopic fractionation during magma differentiation: Constraints from volcanic glasses from the eastern Manus Basin[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2021,305:228-242.
APA Zhu, Hongli.,Liao, Renqiang.,Liu, He.,Du, Long.,Li, He.,...&Sun, Weidong.(2021).Calcium isotopic fractionation during magma differentiation: Constraints from volcanic glasses from the eastern Manus Basin.GEOCHIMICA ET COSMOCHIMICA ACTA,305,228-242.
MLA Zhu, Hongli,et al."Calcium isotopic fractionation during magma differentiation: Constraints from volcanic glasses from the eastern Manus Basin".GEOCHIMICA ET COSMOCHIMICA ACTA 305(2021):228-242.
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