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Calcium isotopic fractionation during magma differentiation: Constraints from volcanic glasses from the eastern Manus Basin

文献类型：期刊论文

作者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
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2021-07-15
卷号305页码:228-242
ISSN号0016-7037
关键词Calcium isotopes Isotopic fractionation Magma differentiation Felsic The eastern Manus Basin
DOI10.1016/j.gca.2021.05.032
通讯作者Li, Congying(licongying@qdio.ac.cn) ; Zhang, Zhaofeng(zzf@cdut.edu.cn)
英文摘要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.
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
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000660120900012
源URL[http://ir.qdio.ac.cn/handle/337002/176864]  
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
推荐引用方式
GB/T 7714		 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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