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首页> 外文期刊>Journal of South American earth sciences >Iron isotope composition of the suspended matter along depth and lateral profiles in the Amazon River and its tributaries
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Iron isotope composition of the suspended matter along depth and lateral profiles in the Amazon River and its tributaries

机译：亚马逊河及其支流沿深度和横向剖面的悬浮物的铁同位素组成

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摘要

Samples of suspended matter were collected at different locations, seasons, depths and lateral profiles in the Amazon River and three of its main tributaries, the Madeira, the Solimoes and the Negro rivers. Their iron isotope compositions were studied in order to understand the iron cycle and investigate the level of isotopic homogeneity at the river cross-section scale. Samples from four depth profiles and three lateral profiles analyzed show suspended matter δ~(57)Fe values (relative to IRMM-14) between -0.501 ± 0.075‰。 and 0.196 ± 0.083‰。 (2SE). Samples from the Negro River, a blackwater river, yield the negative values. Samples from other stations (Whitewater rivers, the Madeira, the Solimoes and the Amazon) show positive values, which are indistinguishable from the average composition of the continental crust (δ~(57)Fe_(IRMM-14) ~ 0.1 ‰。). Individual analyses of the depth and lateral profiles show no significant variation in iron isotope signatures, indicating that, in contrast to certain chemical or other isotopic tracers, one individual subsurface sample is representative of river deeper waters. This also suggests that, instead of providing detailed information on the riverine iron cycling, iron isotopes of particulate matter in rivers will rather yield a general picture of the iron sources.
机译：在亚马逊河及其三个主要支流马德拉河，索利莫斯河和黑人河的不同位置，季节，深度和侧向剖面上采集了悬浮物样品。研究了他们的铁同位素组成，以了解铁的循环并研究河流横截面尺度上的同位素同质水平。对四个深度剖面和三个侧面剖面进行分析的样品显示，悬浮物δ〜（57）Fe值（相对于IRMM-14）在-0.501±0.075‰。和0.196±0.083‰。（2SE）之间。来自黑水河黑人河的样品产生负值。其他站点（怀特沃特河，马德拉岛，索利莫斯河和亚马逊河）的样本显示出正值，与大陆壳的平均成分（δ〜（57）Fe_（IRMM-14）〜0.1‰）没有区别。对深度和侧向剖面的单独分析表明，铁同位素特征没有显着变化，表明与某些化学或其他同位素示踪剂相比，一个单独的地下样品代表了河深水域。这也表明，与其提供有关河中铁循环的详细信息，不如说河流中颗粒物的铁同位素将提供铁源的概况。

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  • 来源
    《Journal of South American earth sciences》 |2013年第7期|35-44|共10页
  • 作者

    Giana Marcia dos Santos Pinheiro; Franck Poitrasson; Francis Sondag; Lucieth Cruz Vieira; Marcio Martins Pimentel;

  • 作者单位

    Institute de Geodencias, Universidade de Brasilia, 70910-900 Brasilia, Brazil ,Laboratoire Ceosciences Environnement Toulouse, Institut de Recherche pour le Developpement - Centre National de la Recherche Scientifique - University de Toulouse 111, 14-16,Avenue Edouard Belin, 31400 Toulouse, France;

    Institute de Geodencias, Universidade de Brasilia, 70910-900 Brasilia, Brazil ,Laboratoire Ceosciences Environnement Toulouse, Institut de Recherche pour le Developpement - Centre National de la Recherche Scientifique - University de Toulouse 111, 14-16,Avenue Edouard Belin, 31400 Toulouse, France;

    Institute de Geodencias, Universidade de Brasilia, 70910-900 Brasilia, Brazil ,Laboratoire Ceosciences Environnement Toulouse, Institut de Recherche pour le Developpement - Centre National de la Recherche Scientifique - University de Toulouse 111, 14-16,Avenue Edouard Belin, 31400 Toulouse, France;

    Institute de Geodencias, Universidade de Brasilia, 70910-900 Brasilia, Brazil;

    Institute de Geodencias, Universidade de Brasilia, 70910-900 Brasilia, Brazil ,lnstituco de Geociencias, Universidade Federal do Rio Grande do Sul, CP 15001, 91501-970 Porto Alegre, Brazil;

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  • 正文语种 eng
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  • 关键词

    Iron isotopes; Amazon River Basin; Depth profile; Lateral profile; Suspended matter;

    机译：铁同位素;亚马逊河流域;深度剖面横向轮廓;悬浮物;

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