• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Iron ore 2011 >Airborne Gravity Gradiometry and Magnetics in the Search for Economic Iron Ore Deposits
【24h】

Airborne Gravity Gradiometry and Magnetics in the Search for Economic Iron Ore Deposits

机译：机载重力梯度仪和磁力仪在寻找经济铁矿床

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

The enrichment of magnetite to haematite and haematite-goethite leads to a coincident magneticrnlow and gravity high within the banded iron formation. Palaeochannel deposits of pisolitic limoniterncan be expected to provide a relative magnetic high and gravity low in a sinuous geometry. Detritalrniron deposits of conglomerate, scree or 'canga' might have indistinct magnetic response but willrnusually have a relative gravity high.rnThese signatures provide clear discriminators detectable by a joint gravity and magnetic survey.rnThe combination of airborne gravity gradiometry and magnetometry is particularly powerfulrnin detecting and discriminating targets, as well as mapping lithologies and structure, across arnwide variety of iron ore deposit styles. It provides detection capabilities in a platform capable ofrnrapid, complete coverage with minimal access issues. This approach has been used in FALCON(TM)rnairborne surveys for iron ore exploration in the Great Lakes, USA; the Middleback Ranges, SouthrnAustralia; and the Hamersley Basin, Western Australia.rnThe complex magnetic properties of iron formations (particularly remanence, anisotropy andrndepth of weathering) prevent this approach from being simple. The use of vector residual magneticrnintensity (VRMI), calculated from the measured total magnetic intensity (TMI), assists by reducingrnthe complexity due to the different directions of the remanent and induced magnetic fi elds.rnEstimations of the density to magnetisation ratio via the pseudo-lithology calculated from thernVRMI and gravity gradients provide a useful method of capturing the discriminatory power of jointrnmagnetic and gravity gradient data.
机译：磁铁矿向赤铁矿和赤铁矿-针铁矿的富集导致带状铁层中的磁低和重力高同时发生。可以预期，在弯曲的几何形状中，火山岩沉积的古河道沉积物会提供相对较高的磁场和较低的重力。砾岩，卵石或'canga'的碎屑铁沉积物可能没有明显的磁响应，但通常会具有相对较高的重力。这些特征提供了可以通过联合重力和磁测量法清楚地辨别的标志。rn机载重力梯度法和磁力法的结合在检测和检测中特别有力。在各种铁矿石矿床样式中区分目标以及绘制岩性和结构。它在能够快速，完整覆盖且访问问题最少的平台上提供检测功能。这种方法已在FALCON（TM）机载勘测中用于美国大湖地区的铁矿石勘探。澳大利亚南南中背山脉；铁地层的复杂磁性（特别是剩磁，各向异性和风化深度）使这种方法变得不简单。根据测得的总磁强度（TMI）计算出的矢量残余磁强度（VRMI）有助于降低由于剩余磁场和感应磁场的方向不同而造成的复杂性。通过伪磁场估计密度与磁化比。从VRMI和重力梯度计算得出的岩性提供了一种有用的方法来捕获关节磁和重力梯度数据的判别力。

著录项

  • 来源
    《Iron ore 2011》|2011年|p.109-116|共8页
  • 会议地点 Perth(AU)
  • 作者

    R Miller; M Dransfi eld;

  • 作者单位

    Fugro Airborne Surveys Pty Ltd, 435 Scarborough Beach Road, Osborne Park WA 6017. Email: rmiller@fugroairborne.com.au;

    Fugro Airborne Surveys Pty Ltd, 435 Scarborough Beach Road, Osborne Park WA 6017. Email: mdransfi eld@fugroairborne.com.au;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 铁矿石;
  • 关键词

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