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首页> 外文期刊>Geochemistry: Exploration, Environment, Analysis >Copper geochemistry in salt from evaporite soils, Coastal Range of the Atacama Desert, northern Chile: an exploration tool for blind Cu deposits
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Copper geochemistry in salt from evaporite soils, Coastal Range of the Atacama Desert, northern Chile: an exploration tool for blind Cu deposits

机译：智利北部阿塔卡马沙漠沿海地区蒸发岩土盐中的铜地球化学：一种用于盲铜矿床的勘探工具

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摘要

The evaporite soil (1.5 to 15 m thick) in the Coastal Range of northern Chile is a serious obstacle to mineral exploration. We conducted a Cu geochemical study in salt beds (mainly gypsum and anhydrite) from this soil. The sampling was distributed over mineralized and barren rocks, in salts of evaporitic soils from hills, slopes, gullies, plains and alluvium-filled valleys. The samples of salt from hills and slopes reflect very well the presence of blind ore deposits, and the magnitude of the Cu anomalies (1000 ppm Cu) is independent of the depth at which the mineralization is located. Similar geochemical response has been found in salt from evaporitic soils that cover gullies, plains and alluvium-filled valleys. However, in the last case the magnitude of the Cu anomalies (200 ppm Cu) depends on the thickness of the gravels and the depth of leached bedrock that covers the blind deposits. Although the Cu anomalies are spiky, their contrast with the background Cu population is remarkable. Sampling of salt from evaporitic soils appears to be a valuable tool for exploration of buried Cu deposits in the exceedingly arid Coastal Range of the Atacama Desert.
机译：智利北部沿海地区 上蒸发的土壤（1.5至15 m厚）是矿物勘探的严重障碍。 我们在盐床（主要是盐矿床）中进行了铜地球化学研究。石膏 和硬石膏）。采样分布在丘陵，斜坡，沟壑，平原和冲积谷中的蒸发土壤盐分中的矿化和贫瘠的岩石上 。来自丘陵和斜坡的盐分样品非常好地反映了 盲矿床的存在，并且 Cu异常（1000 ppm Cu）的大小与无关。 矿化所在的深度。在覆盖 沟壑，平原和冲积谷的蒸发土壤中的盐中也发现了类似的地球化学 响应。但是，在 情况下，Cu异常的大小（200 ppm Cu）取决于砾石的厚度和浸出的深度 覆盖盲区沉积物的基岩。尽管 Cu异常尖峰，但它们与背景 Cu种群的对比却很明显。从蒸发的 土壤中取样盐似乎是勘探极度干旱的阿塔卡马 沙漠沿海地区的 Cu埋藏物的有价值的工具。

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  • 来源
    《Geochemistry: Exploration, Environment, Analysis》 |2005年第4期|00000371-00000378|共8页
  • 作者

    Carlos Palacios; Nelson Guerra; Brian Townley; Alfredo Lahsen; Miguel Parada;

  • 作者单位

    Departmento de Geología, Universidad de Chile, Santiago, Chile (e-mail: cpalacio@cec.uchile.cl, btownley@cec.uchile.cl, alahsen@cec.uchile.cl and maparada@cec.uchile.cl);

    Geoscience Department, Catholic University of the North, Antofagasta, Chile (e-mail: nguerra@ucn.cl);

    Departmento de Geología, Universidad de Chile, Santiago, Chile (e-mail: cpalacio@cec.uchile.cl, btownley@cec.uchile.cl, alahsen@cec.uchile.cl and maparada@cec.uchile.cl);

    Departmento de Geología, Universidad de Chile, Santiago, Chile (e-mail: cpalacio@cec.uchile.cl, btownley@cec.uchile.cl, alahsen@cec.uchile.cl and maparada@cec.uchile.cl);

    Departmento de Geología, Universidad de Chile, Santiago, Chile (e-mail: cpalacio@cec.uchile.cl, btownley@cec.uchile.cl, alahsen@cec.uchile.cl and maparada@cec.uchile.cl);

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

    exploration; geochemistry; buried deposits; evaporitic soils; Coastal Range of Northern Chile;

    机译：勘探;地球化学埋藏的沉积物;蒸发土壤智利北部沿海地区;

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