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基于便携式X射线荧光光谱(PXRF)分析的西南印度洋脊龙角区沉积物地球化学找矿研究

廖时理 陶春辉 赵江南 武泽龙

廖时理, 陶春辉, 赵江南, 武泽龙. 基于便携式X射线荧光光谱(PXRF)分析的西南印度洋脊龙角区沉积物地球化学找矿研究[J]. 地质科技通报, 2022, 41(3): 264-272. doi: 10.19509/j.cnki.dzkq.2021.0068
引用本文: 廖时理, 陶春辉, 赵江南, 武泽龙. 基于便携式X射线荧光光谱(PXRF)分析的西南印度洋脊龙角区沉积物地球化学找矿研究[J]. 地质科技通报, 2022, 41(3): 264-272. doi: 10.19509/j.cnki.dzkq.2021.0068
Liao Shili, Tao Chunhui, Zhao Jiangnan, Wu Zelong. Application of PXRF in sediment analysis for geochemical prospecting in Dragon Horn area on the southwestern Indian Ridge[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 264-272. doi: 10.19509/j.cnki.dzkq.2021.0068
Citation: Liao Shili, Tao Chunhui, Zhao Jiangnan, Wu Zelong. Application of PXRF in sediment analysis for geochemical prospecting in Dragon Horn area on the southwestern Indian Ridge[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 264-272. doi: 10.19509/j.cnki.dzkq.2021.0068

基于便携式X射线荧光光谱(PXRF)分析的西南印度洋脊龙角区沉积物地球化学找矿研究

doi: 10.19509/j.cnki.dzkq.2021.0068
基金项目: 

自然资源部海底矿产资源重点实验室开放基金项目 KLMMR-2015-B-03

大洋专项“十三五”课题 DY135-R-1-0

国家自然科学基金项目 42006074

详细信息
    作者简介:

    廖时理(1986—),副研究员,主要从事海底热液系统研究工作。E-mail:liaosl@sio.org.cn

    通讯作者:

    陶春辉(1968—),研究员,博士生导师,主要从事海底热液系统研究工作。E-mail: taochunhuimail@163.com

  • 中图分类号: P599

Application of PXRF in sediment analysis for geochemical prospecting in Dragon Horn area on the southwestern Indian Ridge

  • 摘要:

    洋中脊热液活动伴生的多金属硫化物是未来重要的接替资源,但目前其勘查技术手段相对匮乏。便携式X射线荧光光谱(PXRF)是针对野外原位快速分析而发展起来的一项新技术,常被应用于岩石露头地球化学研究和土壤重金属污染评价。采用PXRF对西南印度洋脊龙角区的沉积物开展了化学组成分析,并通过元素的空间分布特征确定热液区可能产出的位置。结果表明,研究区的沉积物可能由钙质沉积物、基岩碎屑、热液组分等组成,部分沉积物具有较高的热液成矿元素含量,明显受到了热液活动的影响。通过面浓度-个数分形方法,确定Cu、Zn、Fe、Mn、As等主要成矿元素的异常下限。根据上述元素的空间分布特征,在研究区识别出了6处异常区,其中3处异常区与已知热液区相吻合,另外3处异常区可能代表了未发现的热液活动。上述工作为洋中脊多金属硫化物的勘查提供了新的思路。

     

  • 图 1  西南印度洋中脊龙角区大地构造背景(a)、采样位置图和热液区及异常的位置(b)(据文献[18]修改)

    CIR.中印度洋脊; SWIR.西南印度洋脊; SEIR.东南印度洋脊

    Figure 1.  Tectonic setting (a) and topography map showing locations of sediment samples collected in Dragon Horn area on the southwest Indian Ridge (b)

    图 2  研究区不同粒度沉积物样品照片

    a.电视抓斗沉积物样品; b.0.45~0.9 mm; c.0.28~0.45 mm; e.0.18~0.28 mm; f.0.18~0.145 mm; g.0.071~0.090 mm

    Figure 2.  Photos of the sediments with various diameters in the study area

    图 3  标样180~646连续测试分析结果(其中Al, Si, P, Ca, Fe, S的单位为%,其余为10-6)

    Figure 3.  Continuous analyzing results of the standard sample 180-646

    图 4  龙角区沉积物主要成矿元素的分位数-分位数图

    Figure 4.  Q-Q diagram of main ore forming elements of sediments from the Dragon Horn area

    图 5  龙角区沉积物地球化学组成聚类分析结果

    Figure 5.  Cluster analyzing results of the geochemical components of sediments from the Dragon Horn area

    图 6  龙角区沉积物主要成矿元素的分形模式

    Figure 6.  Fractal patterns of the main ore forming elements of the sediments in Dragon Horn area

    图 7  龙角区沉积物主要成矿元素的空间分布特征

    a.Cu; b.Zn; c.Fe; d.Mn; e.As

    Figure 7.  Spatial distribution features of main ore forming elements of sediments from Dragon Horn area

    表  1  标样180~646连续测试分析统计结果

    Table  1.   Statistic of continuous analyzing results of the standard sample 180-646

    Cu Zn Mn Mo As Zr Sr Ti Al P Si Ca S Fe
    ×10-6 %
    次数N 68 68 68 68 68 68 68 68 68 68 68 68 68 68
    最小值 210 60 391 18 97 370 108 0.421 4.19 1.48 32.36 0.75 0.16 4.06
    最大值 238 75 475 23 107 397 115 0.526 4.89 1.98 34.71 1.30 0.18 4.23
    平均值 225 67 439 20 102 385 112 0.479 4.60 1.71 33.70 0.97 0.17 4.16
    方差 6 3 18 1 2 5 1 0.035 0.19 0.10 0.67 0.14 0.01 0.04
    标样值 237 70 490 16 111 385 109 0.484 3.97
    误差/% -5.12 -4.73 -10.51 27.20 -7.81 -0.10 2.83 -1.00 4.82
    注:Al、Si、P、Ca、Fe、S的单位为%,其余元素含量单位均为10-6
    下载: 导出CSV

    表  2  龙角区沉积物PXRF分析结果统计表

    Table  2.   Statistics of PXRF analyzing results of the sediment samples from Dragon Horn Area

    Cu Zn Pb As Ni Mo Ti Fe Mn K Al Si Ca
    /×10-6 /%
    最小值 15 14 3 2 24 2 94 0.15 0.013 0.02 0.14 0.64 1.75
    最大值 1 202 133 10 14 1032 22 2 005 6.52 2.253 0.58 1.2 19.15 47.15
    平均值 84 36 5 4 92 6 453 1.06 0.071 0.16 0.55 3.49 41.18
    中位数 46 30 5 4 45 5 365 0.59 0.036 0.16 0.52 3.07 42.95
    标准差 155.0 21.0 1.0 2.0 186.0 3.0 344 1.15 0.260 0.08 0.19 2.34 7.41
    变异系数 1.8 0.6 0.2 0.5 2.0 0.5 0.8 0.15 0.013 0.5 0.3 0.7 1.75
    背景值 18 14 4.7 2.0 14.3 0.4 - 0.38 0.033 - - - -
    注:沉积物金属元素背景值据文献[31]
    下载: 导出CSV

    表  3  龙角区沉积物主要成矿元素的分维值

    Table  3.   Fractal dimension value of the main ore forming elements of the sediments in the Dragon Horn area

    指标 Cu Zn Fe As Mn
    D1 0.25 0.35 0.20 0.19 0.230
    D2 1.49 2.62 0.97 2.97 2.450
    异常下限 39.80 27.50 0.38 3.00 0.032
    下载: 导出CSV
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