Molybdenum Mass Fractions and Stable Isotope Compositions of Sedimentary Carbonate and Silicate Reference Materials,Geostandards and Geoanalytical Research

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Molybdenum Mass Fractions and Stable Isotope Compositions of Sedimentary Carbonate and Silicate Reference Materials
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-03-02 , DOI: 10.1111/ggr.12314
Natalie Gaspers _{1,

2} , Tomáš Magna ₁ , Lukáš Ackerman _{1,

3}

Affiliation

A double‐spike method in combination with MC‐ICP‐MS was applied to obtain molybdenum (Mo) mass fractions and stable isotope compositions in a suite of sedimentary silicate (marine, lake, stream, estuarine, organic‐rich sediment, shales, slate, chert) and carbonate reference materials (coral, dolomite, limestones, carbonatites), and a manganese nodule reference material, poorly characterised for stable Mo isotope compositions. The Mo contents vary between 0.076 and 364 μg g⁻¹, with low‐Mo mass fractions (< 0.29 μg g⁻¹) found almost exclusively in carbonates. Intermediate Mo contents (0.73–2.70 μg g⁻¹) are reported for silicate sediments, with the exception of chert JCh‐1 (0.24 μg g⁻¹), organic‐rich shale SGR‐1b (36.6 μg g⁻¹) and manganese nodule NOD‐A‐1 (364 μg g⁻¹). The Mo isotope compositions (reported as δ⁹⁸Mo relative to NIST SRM 3134) range from −1.77 to 1.03‰, with the intermediate precision varying between ± 0.01 and ± 0.12‰ (2s) for most materials. Low‐temperature carbonates show δ⁹⁸Mo values ranging from 0.21 to 1.03‰ whereas δ⁹⁸Mo values of −1.77 and −0.17‰ were obtained for carbonatites CMP‐1 and COQ‐1, respectively. Silicate materials have δ⁹⁸Mo values varying from −1.56 to 0.73‰. The range of δ⁹⁸Mo values in reference materials may thus reflect the increasingly important relevance of Mo isotope investigations in the fields of palaeoceanography, weathering, sedimentation and provenance, as well as the magmatic realm.

中文翻译：

沉积碳酸盐和硅酸盐参考物质的钼质量分数和稳定同位素组成

结合MC-ICP-MS的双峰方法获得了一系列沉积硅酸盐（海洋，湖泊，河流，河口，河口，富含有机物的沉积物，页岩，板岩）中的钼（Mo）质量分数和稳定的同位素组成，石）和碳酸盐参比物质（珊瑚，白云石，石灰石，碳酸盐岩）和锰结核参比物质，对于稳定的Mo同位素组成而言，其表征较差。Mo含量在0.076至364μgg ^-1之间变化，低Mo质量分数（<0.29μgg ^-1）几乎仅存在于碳酸盐中。除硅酸盐JCh-1（0.24μgg ^-1），富含有机物的页岩SGR-1b（36.6μgg ）外，据报道硅酸盐沉积物中的Mo含量为中间（0.73-2.70μgg ^-1）。^-1）和锰结核NOD‐A-1（364μgg ^-1）。Mo的同位素组合物（报告为δ ⁹⁸沫相对于NIST SRM 3134）范围从-1.77到1.03‰，与中间精度±0.01 0.12之间和±变化‰（2个小号）对于大多数材料。低温碳酸盐显示δ ^98个沫值范围从0.21到1.03‰，而δ ^98个为碳酸CMP-1和COQ-1，分别获得的-1.77和Mo值-0.17‰。硅酸盐材料具有δ ^98个沫值改变从-1.56到0.73‰。δ的范围⁹⁸因此，参考材料中的Mo值可能反映了Mo同位素研究在古海洋学，风化，沉积和物源以及岩浆领域中越来越重要的相关性。

更新日期：2020-03-02

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