【摘要】 为了在广大覆盖区寻找隐伏大型特大型矿床的需要 ,我们探索研制了能在短期内以较少的费用迅速覆盖广大覆盖区的能觉察地下深部发出的极微弱直接找矿信息的战略性勘查地球化学新方法—金属活动态测量和地球气微量金属测量。这两种方法在各种景观覆盖区被广泛地加以试验与应用。其结果表明 :( 1)隐伏大型特大型矿床四周巨大的地球化学模式可以被各种营力搬运至地表 ,地气对超微量金属的搬运是厚覆盖区隐伏矿床在地表形成叠加含量地球化学异常的主要原因。 ( 2 )在覆盖厚度从几米至三、四百米都可以发现清晰的异常显示 ,因此为厚覆盖区找矿提供了强有利的工具 ;( 3)地气与元素活动态不仅存在局部异常 ,而且在大型特大型矿床四周存在区域异常和地球化学省 ,用很稀的采样网就可以捕捉到这种大规模异常 ,因此这两种方法可以应用于大面积覆盖区的战略评价中 ;( 4 )地气和元素活动态所反应的指标和适用性在不同的景观、不同的矿床类型上是不同的 ,应根据不同的条件选择应用最佳的方法指标。地气与元素活动态配合使用所获得的深部矿化信息更稳定更可靠。 ( 5)利用元素活动态可以近似定量估计或预测可被成矿利用的金属供应量 ,据此推测某一地区潜在的资源储量更多还原

【Abstract】 Development of cost effective surface geochemical methods is a real challenge to regional exploration for new large and giant deposits in diverse overburden terrians. New geochemical methods——NAMEG (collection of nanoscale metals in earthgas) and MOMEO (leaching of mobile forms of metals in overburden) have been developed. These two methods have been widely investigated for their usefulness and suitability for strategic reconnaissance surveys with wide spaced sampling for delineation of broad geochemical patterns generating from concealed giant ore deposits.Encouraging results have been obtained. (1) Large regional anomalies occur across large and giantore deposits or metallogenic belts. Methods focused on them can be used to delineate strategic targets for the discovery of giant ore deposits. (2) The methods give a significant response to deep seated mineralization at a depth of over 300 meters. The cover does not mask the mineralization indicators. (3) Use of both methods can obtain more reliable information generated from the deep buried mineralization. (4) MOMEO methods can be used to estimates the quantity of metals available for mineralization. (5) These new techniques can significantly reduce the geophysical and drilling costs.更多还原