来自古地壳再循环的渗透熔体对海洋岩石圈地幔的改造：来自难熔碳酸盐Ca[sbnd]Os同位素的证据

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2025-09-29 DOI:10.1016/j.chemgeo.2025.123077

Hui-Chao Rui , Olivier Namur , Dong-Yang Lian , Peng-Jie Cai , Jie Li , Yurisley Valdes-Mariño , Jing-Sui Yang , Hong-Ping He

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引用次数: 0

摘要

最初形成于大洋板块扩张中心之下的海洋岩石圈地幔，在与地幔源基性熔体向上迁移到地壳区域的相互作用中，经常发生改变。在与渗透熔体相互作用过程中沉淀的高难熔性碳酸盐通常保留微量的间隙斜辉石和贱金属硫化物（BMS）。本文通过对古巴Moa-Baracoa蛇绿岩的全岩、矿物Ca和ReOs同位素组成的研究，揭示了熔融-橄榄岩相互作用过程，并评价了它们对岩石圈地幔组成的影响。热力学模拟表明，与枯竭的洋中脊玄武岩地幔相比，所研究的哈茨堡岩经历了高度（20 - 30%）的部分熔融，随后与岩石圈地幔内极少量（< 2%）弧前玄武岩熔体相互作用。全岩δ44/40Ca值为1.06‰~ 1.31‰，低于部分熔融率为20 ~ 30%的高难熔哈尔茨堡土的δ44/40Ca值。这可能是由δ44/40Ca轻的间质斜辉石造成的偏移。此外，187Os/188Os比值（0.1271 ~ 0.1401）升高，同时Re浓度（0.03 ~ 0.64）和187Re/188Os比值（0.08 ~ 1.40）较低，表明地幔中有来自俯冲板块或古地壳成分的放射性成因Os。187Os/188Os比值随δ44/40Ca值的减小而增大的负向趋势进一步验证了Moa-Baracoa辉石中硫化物与斜辉石的共沉淀。值得注意的是，在某些深海橄榄岩和蛇绿橄榄岩中观察到类似的矿物组合和全岩放射性成因的Os组成。二元混合计算表明，这种ReOs特征只发生在从渗透基性熔体中析出的稀有BMS和来自回收古地壳的少量BMS时。

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Modification of oceanic lithospheric mantle by percolated melts sourced from recycled ancient crust: Evidence from CaOs isotopes of refractory harzburgites

Oceanic lithospheric mantle, initially formed beneath the oceanic plate's spreading center, is frequently altered through interaction with mantle-derived mafic melts migrating upward to the crustal regions. Highly refractory harzburgites often retain trace interstitial clinopyroxene and base-metal sulfides (BMS) that precipitate during the interaction with percolating melts. In this study, we present the whole-rock and mineral Ca as well as ReOs isotope compositions of harzburgites from the Moa-Baracoa ophiolite in Cuba, to uncover the melt-peridotite interaction processes and evaluate their impact on the composition of the lithospheric mantle. Thermodynamic modeling indicates that the studied harzburgites have undergone a high degree (20–30 %) of partial melting compared to the depleted mid-ocean ridge basalts mantle, followed by interaction with a very small amount (<2 %) of fore-arc basaltic melts within the lithospheric mantle. The whole-rock δ⁴⁴/⁴⁰Ca values, ranging from 1.06 ‰ to 1.31 ‰, are lower than those calculated for highly refractory harzburgites that have experienced 20–30 % partial melting. This suggests an offset caused by interstitial clinopyroxene with light δ⁴⁴/⁴⁰Ca. Moreover, the elevated ¹⁸⁷Os/¹⁸⁸Os ratios (0.1271–0.1401), combined with low Re concentrations (0.03–0.64) and ¹⁸⁷Re/¹⁸⁸Os ratios (0.08–1.40), imply the addition of radiogenic Os derived either from the subducted slab or ancient crustal components recycled in the mantle. The negative trend of increasing ¹⁸⁷Os/¹⁸⁸Os ratios with decreasing δ⁴⁴/⁴⁰Ca values further validates the co-precipitation of sulfides and clinopyroxene in the Moa-Baracoa harzburgite. Notably, similar mineral assemblages and whole-rock radiogenic Os compositions are observed in certain abyssal peridotites and ophiolitic peridotites. Binary mixing calculations demonstrate that such ReOs characteristics can only occur when rare BMS precipitate from percolating mafic melts with small fractions originating from recycled ancient crust.

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.