A nephelinitic component with unusual δ56Fe in Cenozoic basalts from eastern China and its implications for deep oxygen cycle

He, Yongsheng; Meng, Xunan; Ke, Shaoyong; Wu, Hong‐De; Zhu, Chuankun; Teng, Fang‐Zhen; Hoefs, Jochen; Huang, Junhua; Yang, Wei; Xu, Lijuan; Hou, Zhiguo; Ren, Zhong‐Yuan; Li, Shuguang

doi:10.1016/j.epsl.2019.02.009

Cited by 48 publications

(36 citation statements)

References 51 publications

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“…Nontraditional stable isotopes generally display limited fractionation during high-temperature magmatic processes, whereas surficial processes on Earth's crust often induce significant variation (Teng et al, 2017, and references therein). Given this contrasting feature, nontraditional stable isotopes have been increasingly applied as additional tracers of recycling crustal materials besides radiogenic isotopes (e.g., Elliott et al, 2006;Freymuth et al, 2015;He et al, 2019;Huang et al, 2011;Liu et al, 2016;Nielsen et al, 2017;Yang et al, 2012). In many cases, abnormal stable isotope compositions of metals in mantle rocks and mantlederived melts, that is, heavy δ 66 Zn and ε 205 Tl, and light δ 26 Mg, were difficult to explain by mantle melting and magmatic differentiation (e.g., Huang et al, 2015;Liu et al, 2016;Nielsen et al, 2006;Nielsen et al, 2016;Shen et al, 2018;Teng et al, 2015;Yang et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Copper Isotope Variations During Magmatic Migration in the Mantle: Insights From Mantle Pyroxenites in Balmuccia Peridotite Massif

Zou

Wang

et al. 2019

JGR Solid Earth

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The crust shows large variations in Cu isotopic composition (δ 65 Cu relative to NIST 976) resulting from redox reactions and other supergene processes. The significant range of δ 65 Cu in mantle peridotites thus could be ascribed to recycled crustal materials and/or oxidative mantle metasomatism. However, the influence of normal magmatic fractionation processes on δ 65 Cu variations remains poorly understood, and it is unclear whether the magmatic processes also lead to large δ 65 Cu variations in mantle rocks. To address the issue, we present bulk-rock δ 65 Cu of fresh mantle pyroxenites from the Balmuccia peridotite massif, Northern Italy. These pyroxenites formed by melt-peridotite reaction and mineral accumulation from MORB-to OIB-like, sulfide-saturated basic magmas. Mass balance calculations show that sulfide phases host >98 wt % of the Cu budget of bulk rocks (87−484 μg/g). The pyroxenites show significant variations of δ 65 Cu from −0.66‰ to 0.66‰, which cover the range known for peridotites, including metasomatized ones. Three subsamples from the same pyroxenite layer display >0.3‰ decrease in δ 65 Cu with progressive differentiation. Nevertheless, δ 65 Cu does not display correlations with indicators of magmatic differentiation (e.g., Mg# and Cu/Pd) for all pyroxenites in this study. This might be attributed to variable extents of magmatic sulfide segregation for different samples and/or varying δ 65 Cu of the pyroxenite parent magmas, which were also affected by reactive migration through peridotites. The combined processes can change δ 65 Cu of evolving magmas and reacted peridotites and lead to Cu isotopic heterogeneity in the mantle, without involvement of oxidative metasomatism or recycled crustal materials.

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Section: Introductionmentioning

confidence: 99%

Copper Isotope Variations During Magmatic Migration in the Mantle: Insights From Mantle Pyroxenites in Balmuccia Peridotite Massif

Zou

Wang

et al. 2019

JGR Solid Earth

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“…Since the pioneering works about the GOE, the evolution of the solid Earth has been believed to drive this transition of the atmosphere to some extent, as an important contributor of removing/isolating those reductants (Holland, 1985;Holland et al, 1986;Hayes and Waldbauer, 2006;Kasting, 2013;Eguchi et al, 2020). This is not only because most components of the atmosphere were ultimately derived from degassing of the deep Earth, but also indicated by the coincidence in the evolution history of them (Barley et al, 2005;Kump and Barley, 2007;Campbell and Allen, 2008;Gaillard et al, 2011;Keller and Schoene, 2012;He et al, 2019). The solid Earth is linked to the at-mosphere, hydrosphere and biosphere by weathering, alteration and sedimentary processes, magmatism and subduction.…”

Section: Solid Earth and Deep Oxygen Cyclementioning

confidence: 99%

“…As consequences of a change in the crustal composition, a decrease in nutrient fluxes key for reductant-producing species (e.g., Ni for methanogenesis) and an increase in nutrient fluxes promoting oxygenic photosynthesis (e.g., P) have been expected (Konhauser et al, 2009;Cox et al, 2018). All these processes tend to help accumulate O 2 in the atmo- (Payne et al, 2011;Lyons et al, 2014;He et al, 2019).…”

Section: Solid Earth and Deep Oxygen Cyclementioning

confidence: 99%

“…Once the surficial system being considered as a single redox pool, deep oxygen cycles straightforwardly become crucial (Kasting et al, 1993;Evans, 2012;He et al, 2019;Hu et al, 2016;Duncan and Dasgupta, 2017;Mao et al, 2017). Deep oxygen cycles are referred to the cycling of elements with multiple valences that oxygen is bounded with between the solid Earth and its surface through magmatism and subduction (He et al, 2019). The ambient mantle has been believed to be progressively oxygenated through H 2 loss to space, which then promoted oxygenation of the atmosphere (Catling et al, 2001;Kasting et al, 1993).…”

Section: Solid Earth and Deep Oxygen Cyclementioning

confidence: 99%

“…With the development of the plate tectonics at some time in the Archean (Condie, 2018), exchange of the redox budget between the atmosphere and solid Earth began to be regulated by the balance between magmatic output and subduction input, i.e. the direction and fluxes of deep oxygen cycles (Evans, 2012;Hu et al, 2016;Mao et al, 2017;Duncan and Dasgupta, 2017;He et al, 2019). Recently, three different pathways of deep oxygen cycles have been proposed based on experiments and Fe isotopic evidence of basalts.…”

Section: Solid Earth and Deep Oxygen Cyclementioning

confidence: 99%

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The oxygen cycle and a habitable Earth

Huang

Liu

Shen

et al. 2021

Sci. China Earth Sci.

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As an important contributor to the habitability of our planet, the oxygen cycle is interconnected with the emergence and evolution of complex life and is also the basis to establish Earth system science. Investigating the global oxygen cycle provides valuable information on the evolution of the Earth system, the habitability of our planet in the geologic past, and the future of human life. Numerous investigations have expanded our knowledge of the oxygen cycle in the fields of geology, geochemistry, geobiology, and atmospheric science. However, these studies were conducted separately, which has led to onesided understandings of this critical scientific issue and an incomplete synthesis of the interactions between the different spheres of the Earth system. This review presents a five-sphere coupled model of the Earth system and clarifies the core position of the oxygen cycle in Earth system science. Based on previous research, this review comprehensively summarizes the evolution of the oxygen cycle in geological time, with a special focus on the Great Oxidation Event (GOE) and the mass extinctions, as well as the possible connections between the oxygen content and biological evolution. The possible links between the oxygen cycle and biodiversity in geologic history have profound implications for exploring the habitability of Earth in history and guiding the future of humanity. Since the Anthropocene, anthropogenic activities have gradually steered the Earth system away from its established trajectory and had a powerful impact on the oxygen cycle. The human-induced disturbance of the global oxygen cycle, if not controlled, could greatly reduce the habitability of our planet.

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Improved in situ analysis of lead isotopes in low‐Pb melt inclusions using laser ablation–multi‐collector–inductively coupled plasma–mass spectrometry

Zhang

Liu

et al. 2022

Rapid Comm Mass Spectrometry

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Rationale In situ Pb isotope analyses of tiny melt inclusions using laser ablation–multi‐collector–inductively coupled plasma–mass spectrometry (LA–MC–ICP–MS) are crucial for exploring the origins of mafic lavas. However, quantitative use of this technique with low‐Pb (<10 ppm) melt inclusions is difficult due to their low 204Pb content and 204Hg interference. Methods Pb isotopic ratios of various reference glasses and olivine‐hosted melt inclusions were determined using LA–MC–ICP–MS. Multiple ion counters were used to simultaneously determine signal intensities of all Pb isotopes and 202Hg. An Hg signal‐removal smoothing device reduced its signal in the gas blank by >80%. Instrumental mass bias was corrected using the standard–sample bracketing method. Results With 24–90 μm diameter laser spots, 2–4 Hz repetition rates, and 2.5–4 J cm−2 energy fluence, the analytical precisions of 20xPb/204Pb ratios (x = 6, 7, 8) for standards BHVO‐2G, ML3B‐G, NIST 614, NKT‐1G, T1‐G, GOR132‐G, and StHs6/80‐G were <1.0% (2RSD) when 208Pb signals >100 000 cps. The Wangjiadashan melt inclusions have 206Pb/204Pb = 17.14–18.44, 207Pb/204Pb = 15.28–15.66, and 208Pb/204Pb = 37.12–38.68. Conclusions The described method improves the precision and accuracy of in situ Pb isotope analysis in low‐Pb melt inclusions using LA–MC–ICP–MS. The Pb isotopic compositions of the Wangjiadashan melt inclusions indicate the coexistence of LoMu and EMII+young HIMU components in the mantle source of weakly alkaline basalts.

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A nephelinitic component with unusual δ56Fe in Cenozoic basalts from eastern China and its implications for deep oxygen cycle

Cited by 48 publications

References 51 publications

Copper Isotope Variations During Magmatic Migration in the Mantle: Insights From Mantle Pyroxenites in Balmuccia Peridotite Massif

Copper Isotope Variations During Magmatic Migration in the Mantle: Insights From Mantle Pyroxenites in Balmuccia Peridotite Massif

The oxygen cycle and a habitable Earth

Improved in situ analysis of lead isotopes in low‐Pb melt inclusions using laser ablation–multi‐collector–inductively coupled plasma–mass spectrometry

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