Novel Crushing Technique for Measuring δ18O and δ2H Values of Fluid Inclusions (H2O) in Quartz Mineral Veins Using Cavity Ring-Down Spectroscopy

IF 1.2 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Geofluids Pub Date : 2024-07-17 DOI:10.1155/2024/5795441
Akbar Aydin Oglu Huseynov, H. J. L. van der Lubbe (Jeroen), S. J. A. Verdegaal-Warmerdam, Onno Postma, Julian Schröder, Hubert Vonhof
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引用次数: 0

Abstract

Fluid inclusions in mineralized fracture infillings (i.e., veins) could preserve information about subsurface fluids like temperature and salinity. The isotopic composition of water in these fluid inclusions could provide direct evidence of the provenance of these mineral-forming fluids. So far, the isotope compositions of fluid inclusions have been mainly derived from carbonate veins and other precipitates, like speleothems. The aim of this study is to analyse the δ18O and δ2H isotopic compositions of aqueous fluid inclusions of quartz veins using a cavity ring-down spectroscopy (CRDS) analyser in combination with a moisturized nitrogen background and mechanical crusher. For this study, we analysed δ18O and δ2H values of fluid inclusions in quartz veins from three north-western European locations formed during the Variscan orogeny. Prior to crushing, the fluid-rich quartz fraction was separated from the pure quartz fraction, from other mineral phases and host rock by using conventional heavy liquids and magnet separation. Raman spectrometry detected some rare occurrences of hydrocarbon, methane, and nitrogen in the fluid inclusions. The samples were sequentially crushed to elucidate the potential impact of different fluid inclusion assemblages (FIA) on the δ18O and δ2H values. The results from single and sequential mechanical crushing, together with interlaboratory comparisons, exhibit reliable and consistent isotopic patterns across locations with high precision (for δ18O: 1σ SD < 0.8; for δ2H: 1σ SD < 1.5). The obtained data occur in three different clusters for three study zones, providing evidence for the presence of meteoric-derived fluids in the fold-and-thrust belts of the Variscan orogeny. These findings demonstrate that the CRDS approach can be successfully applied to quartz minerals, investigating fluid pathways within the upper crust and the formation of these secondary minerals.

Abstract Image

利用腔环向下光谱法测量石英矿脉中流体包裹体 (H2O) δ18O 和 δ2H 值的新型破碎技术
矿化断裂填充物(即矿脉)中的流体包裹体可以保存温度和盐度等地下流体信息。这些流体包裹体中水的同位素组成可以为这些成矿流体的来源提供直接证据。迄今为止,流体包裹体的同位素组成主要来自碳酸盐矿脉和其他沉淀物(如岩浆)。本研究的目的是利用空腔环降光谱分析仪(CRDS),结合保湿氮背景和机械破碎机,分析石英矿脉含水流体包裹体的δ18O和δ2H同位素组成。在这项研究中,我们分析了欧洲西北部三个地区在瓦利斯坎造山运动期间形成的石英矿脉中流体包裹体的δ18O和δ2H值。在破碎之前,使用传统的重液和磁铁分离法将富含流体的石英部分从纯石英部分、其他矿物相和主岩中分离出来。拉曼光谱检测到流体包裹体中存在一些罕见的碳氢化合物、甲烷和氮。为了阐明不同流体包裹体组合(FIA)对δ18O 和 δ2H值的潜在影响,对样品进行了顺序破碎。单次和连续机械破碎的结果以及实验室间的比较结果显示,不同地点的同位素模式可靠一致,精度高(δ18O:1σ SD < 0.8‰;δ2H:1σ SD < 1.5‰)。所获得的数据出现在三个研究区的三个不同群组中,为瓦里斯坎造山运动的褶皱推覆带中存在陨石衍生流体提供了证据。这些发现表明,CRDS 方法可成功应用于石英矿物,研究上地壳内的流体路径和这些次生矿物的形成。
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来源期刊
Geofluids
Geofluids 地学-地球化学与地球物理
CiteScore
2.80
自引率
17.60%
发文量
835
期刊介绍: Geofluids is a peer-reviewed, Open Access journal that provides a forum for original research and reviews relating to the role of fluids in mineralogical, chemical, and structural evolution of the Earth’s crust. Its explicit aim is to disseminate ideas across the range of sub-disciplines in which Geofluids research is carried out. To this end, authors are encouraged to stress the transdisciplinary relevance and international ramifications of their research. Authors are also encouraged to make their work as accessible as possible to readers from other sub-disciplines. Geofluids emphasizes chemical, microbial, and physical aspects of subsurface fluids throughout the Earth’s crust. Geofluids spans studies of groundwater, terrestrial or submarine geothermal fluids, basinal brines, petroleum, metamorphic waters or magmatic fluids.
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