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首页> 外文期刊>Journal of Applied Geophysics >Rock magnetic characterization of the mine tailings in Portman Bay (Murcia, Spain) and its contribution to the understanding of the bay infilling process
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Rock magnetic characterization of the mine tailings in Portman Bay (Murcia, Spain) and its contribution to the understanding of the bay infilling process

机译：波特曼湾（西班牙穆尔西亚）矿山尾矿的岩磁特征及其对了解海湾充填过程的贡献

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The Portman Bay located in the SE Spain has suffered great changes since the 1950s associated with the mining activity. The direct discharge into the sea of mining waste has caused the silting of the bay in a few decades. In this study the magnetic properties of recent sands from a set of 52 samples from the bay and 16 samples from an opencast mine are magnetically analyzed. In particular, we have measured magnetic susceptibility, hysteresis loops, IRM-acquisition, SIRM-IRM and back-field-coercivity spectra, thermomagnetic curves and FORC diagram and took SEM micropictures. Data are correlated with classical magnetite content estimations derived from X-ray diffraction (XRD) in three separated grain sized (coarse, medium and fine grains) and heavy metal derived from X Ray Fluorescence (XRF) in samples from a parallel study at the same sampling sites and the same sampling campaign. The results indicate high concentrations of magnetite (up to 28%) compared to magnetically hard minerals that have not been quantified. Higher concentrations of magnetite are recorded in the central part of the beach, as indicated by M-s, SIRM and K-init. Coercivity, however, indicates smaller values in the center of the Bay, suggesting a larger size of the magnetic particles. The S-ratio or high coercivity fraction is higher in older samples. Correlation of the magnetic properties with magnetite grain size indicates a positive correlation between M-s and medium and fine grain size fractions, determined by X-ray diffraction. In addition, magnetic properties show a direct relationship between magnetite content and the heavy metals Pb, Cu and As. Our results indicate that the deposition of magnetite was fast and properties have not been modified in depth. However, spatial location in the Bay is significant when we examine distribution of grain sizes. Also, results suggest that magnetite acts as captor of heavy metals. (C) 2015 Elsevier B.V. All rights reserved.
机译：自1950年代以来与采矿活动相关的西班牙东南部的波特曼湾发生了巨大变化。几十年来，直接将排入采矿废料的海排泄物造成了海湾的淤积。在这项研究中，对来自海湾的52个样本和一个露天矿的16个样本中的最近砂的磁学特性进行了磁性分析。特别是，我们测量了磁化率，磁滞回线，IRM采集，SIRM-IRM和后场矫顽力谱，热磁曲线和FORC图，并拍摄了SEM显微照片。数据与通过平行研究的样品中的三个分离的晶粒尺寸（粗晶粒，中晶粒和细晶粒）的X射线衍射（XRD）得出的经典磁铁矿含量估算和X射线荧光（XRF）得出的重金属相关。采样地点和相同的采样活动。结果表明，与尚未量化的磁性硬矿物相比，磁铁矿的浓度高（高达28％）。如M-s，SIRM和K-init所示，在海滩的中部记录到较高的磁铁矿浓度。但是，矫顽力表示海湾中心的值较小，这表明磁性粒子的尺寸较大。在较老的样品中，S比或高矫顽力分数较高。磁性能与磁铁矿晶粒尺寸的相关性表明，M-s与中，细晶粒尺寸分数之间存在正相关，这是通过X射线衍射确定的。另外，磁性能显示出磁铁矿含量与重金属Pb，Cu和As之间的直接关系。我们的结果表明，磁铁矿的沉积速度很快，而且其深度并未改变。但是，当我们检查晶粒尺寸的分布时，海湾中的空间位置很重要。同样，结果表明磁铁矿可作为重金属的俘获剂。 （C）2015 Elsevier B.V.保留所有权利。

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