• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geochemistry: Exploration, Environment, Analysis >Relationship between groundwater chemistry and soil geochemical anomalies at the Spence copper porphyry deposit, Chile
【24h】

Relationship between groundwater chemistry and soil geochemical anomalies at the Spence copper porphyry deposit, Chile

机译：智利Spence铜斑岩矿床的地下水化学与土壤地球化学异常之间的关系

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Spence is a supergene-enriched copper porphyry deposit located between Antofagasta and Calama in the Atacama Desert of northern Chile. Porphyry intrusion and hypogene mineralization took place during the Palaeocene. Following supergene enrichment that produced an atacamite–brochantite assemblage in the oxide zone, the deposit was covered by 50 to 100 m of piedmont gravels of Miocene age. RioChilex discovered the deposit in 1996 by reconnaissance drilling. This paper describes elemental and isotopic data for groundwaters collected within and peripheral to the deposit and relates these compositions to geochemical anomalies in gravel soils over the deposit. There are two distinct types of groundwater with distinctive isotopic and elemental composition: saline water (average Cl= 11 600 mg/l) extending downflow from the axis of the deposit; and non-saline water (average Cl=1300 mg/l) upflow from the axis. Oxygen and hydrogen isotope ratios imply that the former is a deep formation water and the other is meteoric water derived from precipitation in mountains to the east. The data suggest that the saline formation water flows upward from a permeable fault zone coincident with the long axis of the deposit. This fault may have originally guided the intrusion of the porphyries and the copper-bearing hydrothermal fluids. The saline water has much greater contents of As and Se (up to 129 ppb and 800 ppb, respectively) than the meteoric water (both less than detection limits of 10 and 50 ppb, respectively), but both types have high amounts of Cu within the deposit area. Dispersion of Cu away from the deposit is restricted by adsorption of Cu2+ on negatively charged hydroxide colloids, whereas As and Se freely disperse dissolved as anions. Reactivation of the axial fault created a permeable fracture zone in the gravels above the deposit. During earthquake activity there was pumping of saline formation water to the surface up this fracture zone, which created soil anomalies. The anomalies are characterized by NaCl, As, Se and Cu. One kilometre to the east of the deposit there is another fracture zone in the gravels, overlying unmineralized basement. Soils above this zone have anomalies for NaCl, As and Se, indicative of flooding by formation water, but lacking Cu.
机译：Spence是位于智利北部阿塔卡马沙漠中安托法加斯塔和卡拉马之间 的一种富含超基因的铜斑岩矿床。在古新世期间，斑岩侵入和次生矿化作用发生了 。在超基因富集之后，在氧化带中产生了 硫铁矿-青铜矿组合， 该沉积层被中新世的山前砾石覆盖了50至100 m年龄。 RioChilex于1996年通过勘察 钻井发现了该矿床。本文描述了在矿床 内和外围沉积的 地下水的元素和同位素数据，并将这些成分与矿床砾石 土壤中的地球化学异常联系起来。 。地下水 有两种不同的同位素和元素组成：盐水 水（平均Cl = 11600 mg / l）从 存款轴；和非盐水（平均Cl = 1300 mg / l）从轴上流 。氧和氢同位素比暗示 前者是深层水，而另一种是来自东部山区降水的流星水。 数据表明，盐水形成水从 与 沉积物的长轴重合的可渗透断层带向上流动。该故障可能原本是导致斑岩和含铜热液侵入的 。 盐水中的As和Se含量要高得多（up < / sup>分别达到129 ppb和800 ppb），比 （均低于10和50 ppb的检出限）， ，但两种类型都高 铜从沉积物中的扩散受到Cu 2 + 在带负电荷的氢氧化物胶体上的吸附 的限制，而As 和Se自由地分散成阴离子。重新激活 轴向断层在矿床上方的砾石 中创建了一个可渗透的断裂带。在地震活动期间，将 盐水形成水泵送到该断裂带上方的地表， 造成了土壤异常。异常的特征是用NaCl，As，Se和Cu 表征。矿床 以东一公里处，砾石中还有另一个断裂带，覆盖在未矿化的 基底之上。该区域上方的土壤具有NaCl，As 和Se异常，表明被地层水淹没，但缺乏 Cu。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号