...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Quaternary Science Reviews: The International Multidisciplinary Review Journal >The role of African dust in the formation of Quaternary soils on Mallorca, Spain and implications for the genesis of Red Mediterranean soils
【24h】

The role of African dust in the formation of Quaternary soils on Mallorca, Spain and implications for the genesis of Red Mediterranean soils

机译：非洲尘埃在西班牙马洛卡第四纪土壤形成中的作用及其对红色地中海土壤成因的启示

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

African dust additions explain the origin of terra rossa soils that are common on the carbonate-platform island of Mallorca, Spain. Mineralogical and geochemical analyses indicate that Quaternary carbonate eolianites on Mallorca have a very high purity, usually composed of more than 90% carbonate minerals (calcite, dolomite, and aragonite). In contrast, terra rossa soils developed on these eolianites have lower carbonate contents and contain higher concentrations of quartz and other silicates. Analyses of immobile trace elements indicate that the non-carbonate fractions of the eolianites have distinctive Zr/Hf, La/Yb, Cr/Sc and Th/Ta values that differ from the superjacent terra rossa soils. These observations indicate that even if sufficient dissolution of the eolianite had taken place to create the soils by residual accumulation, immobile element ratios in the soils require an external source. However, Zr/Hf, La/Yb, Cr/Sc and Th/Ta values in the soils fall within the range of values for these element ratios in African dust collected on Barbados and mainland Spain. We conclude that the silicate fractions of terra rossa soils on Mallorca are derived mainly, though not wholly, from far-traveled African dust, and this process may explain the origin of other terra rossa soils found in southern Europe.
机译：非洲粉尘的添加解释了西班牙马略卡岛碳酸盐岩平台岛上常见的罗莎土壤的起源。矿物学和地球化学分析表明，马略卡岛上的第四纪碳酸盐风成岩具有很高的纯度，通常由90％以上的碳酸盐矿物（方解石，白云石和文石）组成。相反，在这些风成岩上发育的Terra rossa土壤的碳酸盐含量较低，并含有较高浓度的石英和其他硅酸盐。固定微量元素的分析表明，风成岩的非碳酸盐级分具有独特的Zr / Hf，La / Yb，Cr / Sc和Th / Ta值，不同于上层的红土土壤。这些观察结果表明，即使风化岩已经充分溶解以通过残留积聚形成土壤，土壤中固定元素的比例也需要外部来源。然而，土壤中的Zr / Hf，La / Yb，Cr / Sc和Th / Ta值落入在巴巴多斯和西班牙大陆收集的非洲粉尘中这些元素比的值范围内。我们得出的结论是，马略卡岛上的罗莎土壤的硅酸盐部分主要（尽管不是全部）源自远距离旅行的非洲尘埃，这一过程可能解释了在欧洲南部发现的其他罗莎土壤的起源。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号