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首页> 外文期刊>Journal of Asian earth sciences >Chemical weathering of monsoonal eastern China: implications from major elements of topsoil
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Chemical weathering of monsoonal eastern China: implications from major elements of topsoil

机译：中国东部季风的化学风化：来自表层土主要元素的影响

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摘要

Major element compositions of 36 bulk samples and 41 clay samples, which were obtained from 47 top-soils collected in monsoonal eastern China, were investigated with conventional wet chemistry and X-ray fluorescence (XRF) spectrometry, respectively. Based on major element analyses, the mobility of major elements and latitudinal distributions of SiO_2/Al_2O_3 ratio, chemical index of alteration (CIA), chemical index of weathering (CIW) and weathering index of Parker (WIP) were analyzed. Meanwhile, the suitability of these chemical weathering indices to topsoils in monsoonal eastern China and its controls were discussed. These investigations indicate that Na, K, Ca, Mg, and Si are relatively depleted, while Mn, P, Fe and Ti are relatively enriched in topsoils of the study area by comparison with their contents in the upper continent crust (UCC), and that alkali metal (Na, K) and alkaline earth metal (Ca, Mg) elements are generally easier to be depleted from their parent materials than other major elements during chemical weathering. The latitudinal distributions of CIA, CIW and WIP show that they are suitable to both bulk and clay samples, but SiO_2/Al_2O_3 is only suitable to clay samples, not suitable in bulk ones. All these investigations indicate a significant dependence of grain-size in major element abundance and latitudinal distributions of SiO_2/ Al_2O_3, CIA, CIW and WIP, but parent rock type has little effect on them, except its impact on the latitudinal distribution of WIP in clay samples. The significant grain-size dependence probably indicates the presence of unaltered minerals in bulk samples, thus we suggest that clay samples are more suitable to investigating chemical weathering of sediments on continents than bulk samples. The trivial effect of parent rock type probably indicates a relatively uniform chemical weathering on various parent rocks. Correlation analyses indicate that climate is the dominant control of chemical weathering of topsoils in the study area, and the significant latitude effect indicated by the spatial distributions of chemical weathering indices actually reflect the climate control on chemical weathering of topsoils. Chemical weathering indices actually reflect the integrated weathering history in the study area. Besides the dominant control of climate, other factors like tectonics, parent rock, biology, landform and soil depth and age might also have some effect on the chemical weathering of topsoils in the study area, which needs further research.
机译：利用常规湿化学法和X射线荧光光谱法研究了从中国东部季风采集的47个表层土壤中获得的36个散装样品和41个粘土样品的主要元素组成。基于主要元素分析，分析了主要元素的迁移率和SiO_2 / Al_2O_3比的纬度分布，化学变化指数（CIA），耐候化学指数（CIW）和帕克耐候指数（WIP）。同时讨论了这些化学风化指数对中国东部季风土壤的适应性及其控制措施。这些研究表明，与上部大陆地壳（UCC）中的含量相比，研究区表层土壤中的Na，K，Ca，Mg和Si相对贫乏，而Mn，P，Fe和Ti相对富集，并且在化学风化过程中碱金属（Na，K）和碱土金属（Ca，Mg）元素通常比其他主要元素更容易从其母体材料中耗竭。 CIA，CIW和WIP的横向分布表明它们既适用于块状和粘土样品，但SiO_2 / Al_2O_3仅适用于粘土样品，不适用于块状样品。所有这些研究表明，晶粒尺寸对SiO_2 / Al_2O_3，CIA，CIW和WIP的主要元素丰度和纬度分布有很大的依赖性，但是母岩类型对其影响不大，除了对粘土中WIP的纬度分布有影响外样品。明显的粒度依赖性可能表明散装样品中未改变的矿物的存在，因此我们建议粘土样品比散装样品更适合于研究大陆上沉积物的化学风化。母岩类型的琐碎作用可能表明各种母岩上的化学风化相对均匀。相关分析表明，气候是研究区表土化学风化的主要控制因素，化学风化指数空间分布所表明的显着纬度效应实际上反映了气候对表土化学风化的控制。化学风化指数实际上反映了研究区域的综合风化历史。除了主要控制气候外，构造，母岩，生物学，地形，土壤深度和年龄等其他因素也可能对研究区表土的化学风化有一定影响，有待进一步研究。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第25期|77-90|共14页
  • 作者

    Shifan Qiu; Zhaoyu Zhu; Tian Yang; Yi Wu; Yang Bai; Tingping Ouyang;

  • 作者单位

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

    College of Environment and Resources, Guangxi Normal University, Guilin 541004, China;

    South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Chemical weathering; Monsoonal eastern China; Topsoil; Major elements;

    机译：化学风化;中国东部季风;表土;主要要素;

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