氧化还原态对地幔中铬同位素分馏的影响:来自尖晶石橄榄岩捕虏体的见解

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Qiuxia Wang , Jianping Zheng , Xianquan Ping , Hongkun Dai , Qing Xiong , Xiangli Wang
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引用次数: 0

摘要

地幔中铬(Cr)同位素分馏通常被解释为由部分熔融和交代作用等地幔过程引起的,但氧逸度的影响仍然知之甚少。本文报道了华北克拉通晚白垩世—新生代玄武岩尖晶石橄榄岩捕虏体的全岩和矿物元素浓度、矿物Fe3+/ΣFe比值和全岩Cr同位素组成。结果表明,北中带西北部和东部为新近形成的肥沃岩石圈地幔(橄榄石Mg# = 0.89 ~ 0.91)所覆盖,而北中带中部则保留了浅层古难熔地幔遗迹(橄榄石Mg# = ~ 0.92)。两种地幔类型在氧逸度范围内表现出一定的重叠(富氧:FMQ-1.61 ~ FMQ-0.19;难治性:FMQ-0.92至FMQ + 1.58),但可育性(平均FMQ-0.75)往往比难治性(平均FMQ + 0.20)更少。此外,前者的Cr同位素值范围(- 0.27±0.03‰~ - 0.03±0.04‰)比后者宽(ẟ53Cr = - 0.20±0.06‰~ - 0.13±0.06‰),但这些橄榄岩的ẟ53Cr值与部分熔融(如全岩Mg#、Al2O3含量)和交代(如(La/Yb)N)指标没有相关性。这些观测结果表明,Cr同位素的变化可能受到岩石圈地幔氧化还原状态的影响,在氧化条件下,同位素分馏往往受到限制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of redox state on chromium isotope fractionation in the mantle: Insights from spinel peridotite xenoliths
Chromium (Cr) isotope fractionation in the mantle is generally interpreted as induced by mantle processes like partial melting and metasomatism, but the influence of oxygen fugacity remains poorly understood. Here, we report whole-rock and minerals elemental concentrations, minerals Fe3+/ΣFe ratios and whole-rock Cr isotope compositions for Late Cretaceous-Cenozoic basalt-borne spinel peridotite xenoliths from the North China Craton (NCC). The results show that the northwest and eastern NCC is underlain by a newly fertile lithospheric mantle (olivine Mg# = 0.89–0.91), while the central NCC retains shallow relics of ancient refractory mantle (olivine Mg# = ∼0.92). The two mantle types show some overlapping in the range of oxygen fugacity (fertile: FMQ-1.61 to FMQ-0.19; refractory: FMQ-0.92 to FMQ + 1.58), but the fertile one (mean FMQ-0.75) tends to be more reduced than the refractory one (mean FMQ + 0.20). Furthermore, the former shows a relatively wide range of Cr isotopic values from −0.27 ± 0.03 ‰ to −0.03 ± 0.04 ‰ than the latter (ẟ53Cr = −0.20 ± 0.06 ‰ to −0.13 ± 0.06 ‰), but the ẟ53Cr values of these peridotites are not correlated with the indices for partial melting (e.g., whole-rock Mg# and Al2O3 contents) and metasomatism (e.g., (La/Yb)N). These lines of observation jointly suggest that the Cr isotope variations may be influenced by the redox state of the lithospheric mantle, and isotope fractionation tends to be restricted under oxidized conditions.
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来源期刊
Lithos
Lithos 地学-地球化学与地球物理
CiteScore
6.80
自引率
11.40%
发文量
286
审稿时长
3.5 months
期刊介绍: Lithos publishes original research papers on the petrology, geochemistry and petrogenesis of igneous and metamorphic rocks. Papers on mineralogy/mineral physics related to petrology and petrogenetic problems are also welcomed.
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