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首页> 外文期刊>Journal of African Earth Sciences >Petrology and geochemistry of selected nepheline syenites from Malawi anc their potential as alternative potash sources
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Petrology and geochemistry of selected nepheline syenites from Malawi anc their potential as alternative potash sources

机译：马拉维精选霞石正长岩的岩石学和地球化学及其作为替代钾盐来源的潜力

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摘要

The Sub Saharan Africa agricultural sector is one of the most disadvantaged regions, partly due to high fertiliser import costs from the northern hemisphere. Malawi is one such country which faces these fertiliser challenges for the agricultural sector growth and food crop production. However, Malawi has numerous intrusive alkaline rocks, nepheline syenites, especially within the Chilwa alkaline province. This study was therefore conducted to assess these nepheline syenites for their potential as potassium sources. We used Malawi's new airborne geophysical gamma ray data acquired in 2013, coupled with satellite remote sensing, to identify nepheline syenites suitable as possible sources for alternative silicate K-fertiliser, and carried out geochemical analysis of whole rock samples. Results show that the K2O content for the nepheline syenites varies from 3.17 wt % to 9.14 wt % with an average of 5.22 wt %. The K2O/Na2O ratio for Malawi's nepheline syenites ranges from 0.41 to 1.28 with an average of 0.65 showing that the nepheline syenites are mostly sodic but with variable composition. In addition to nepheline, the calcium feldspathoid davidsmithite ((Na,Ca)AlSiO4) was identified in the syenites using scanning electron microscopy with energy dispersive analysis. Although the different intrusive complexes are not homogenous, our results show that, generally, the nepheline syenites from Malawi have similar geo-chemistry and mineralogical composition to those which have been used as crushed-rock fertilisers in other parts of the world.
机译：撒哈拉以南非洲的农业部门是最不利的地区之一，部分原因是北半球的化肥进口成本很高。马拉维就是这样一个国家，在农业部门的增长和粮食作物生产方面面临着这些肥料挑战。但是，马拉维有许多侵入性的碱性岩石，霞石正长岩，尤其是在奇尔瓦州碱性省内。因此，进行该研究以评估这些霞石正长岩作为钾源的潜力。我们使用了马拉维在2013年获得的新的航空地球物理伽马射线数据，并结合了卫星遥感技术，确定了适合用作替代硅酸盐钾肥来源的霞石正长岩，并对整个岩石样品进行了地球化学分析。结果表明，霞石正长岩的K 2 O含量在3.17重量％至9.14重量％之间变化，平均为5.22重量％。马拉维霞石正长岩的K2O / Na2O比在0.41至1.28之间，平均为0.65，表明霞石正长岩大多数为苏打水，但组成可变。除霞石外，还利用扫描电子显微镜和能量色散分析法鉴定了正长岩中的钙长石样钙铁辉石（（Na，Ca）AlSiO4）。尽管不同的侵入复合物不是同质的，但我们的结果表明，马拉维的霞石正长岩的地球化学和矿物学组成与世界其他地区用作碎石肥料的相似。

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  • 来源
    《Journal of African Earth Sciences》 |2020年第4期|103769.1-103769.20|共20页
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    Newcastle Univ Sch Nat & Environm Sci Newcastle Upon Tyne NE1 7RU Tyne & Wear England|Geol Survey Malawi POB 27 Zomba Malawi;

    Edge Hill Univ Dept Geog St Helens Rd Ormskirk L39 4QP England|Univ Edinburgh Sch Geosci Edinburgh EH9 3FE Midlothian Scotland;

    Newcastle Univ Sch Nat & Environm Sci Newcastle Upon Tyne NE1 7RU Tyne & Wear England;

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  • 正文语种 eng
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  • 关键词

    Potassium; Nepheline syenite; Davidsmithite; SEM-EDS; Malawi; Geophysical gamma ray spectrometry;

    机译：钾;霞石正长岩;大卫史密斯扫描电镜马拉维;物探伽玛射线能谱;

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