| 陈玉明,夏修展,甘秋玲,耿林,杨刚.阿根廷米纳毕戈塔地区水系沉积物采样粒度试验研究[J].地质找矿论丛,2016,31(2):295-302 |
| 阿根廷米纳毕戈塔地区水系沉积物采样粒度试验研究 |
| Test study on particle size sampling of stream sediment in Minas Pirquitas Area of Argentina |
| 投稿时间：2015-12-03 |
| DOI：10.6053/j.issn.1001-1412.2016.02.020 |
| 中文关键词: 水系沉积物 粒度试验 元素分布 地球化学异常 阿根廷 |
| 英文关键词:stream sediment particle sizes test distribution patterns of element geochemical anomaly Argentina |
| 基金项目:中央地勘基金国外矿产资源风险勘查专项(编号:科合10262A002、科合201210A06200202)资助。 |
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| 中文摘要: |
| 中国地质调查局与阿根廷地质矿产调查局合作在阿根廷西北部米纳毕戈塔地区进行1:25万水系沉积物测量,该区属于干旱-半干旱高寒山区,为突出找矿效果,消除或减少风积物干扰,需要确定适合于该区的水系沉积物采样粒度。为此,在该区选择一个有已知矿床的1:5万图幅进行采样粒度试验,分别选择10~60目、-60目、60~80目、-80目4个粒度级进行粒度试验;根据我国区域地球化学勘查规范,每个粒度分析39种元素。结果表明,大部分元素在4种粒度水系沉积物中的分布形态基本一致,都能够较好地反映出区内已知矿床,说明采用的采样方法可以有效地避免风成砂干扰;金、银、铜、锡等成矿元素在4种粒度中的分布略有差异,10~60目的金、铜和锡异常对已知矿体的反应更清晰准确。因此,本区水系沉积物地球化学测量的最佳采样粒度是10~60目。根据本次试验结果,中-阿地调局在本区联合开展1:25万水系沉积物地球化学测量时采用了10~60目水系沉积物作为采样介质,取得了很好的效果。这是本区第一次进行水系沉积粒度试验,对本区将来的地球化学调查和研究具有指导意义。 |
| 英文摘要: |
| Sino-Argentina cooperative stream sediment survey at scale 1:250000 is carried out in arid-semiarid alpine mountainous area of the Mina Pirquitas area in the Northwest Argentian. For eliminating or reducing the interference of aeolian sediments and highlighting the prospecting effect sampling particle size suitable for the area must be determined. Test study on particle size sampling in the area is carried out at scale 1:50000. Four particle sizes, 10-60 mesh, 60-80 mesh, -60 mesh and -80 mesh are selected for test. 39 elements analysis for each particle size adopted in China is applied to the area. The results show that distribution patterns of most elements in the four particle size are basically same in the area and the known deposits are better reflected by the survey. This indicates that the sampling method can effectively avoid the aeolian sand interference. Analysis of Gold, silver, copper, tin etc., the ore-forming elements for the four particle sizes is slightly different but gold, copper and tin anomalies are delineated for data of 10 to 60 mesh and the anomlies reflect bitterly the known ore bodies. So 10 to 60 mesh is the optimum sampling particle size. Then it is applied to the cooperative survey with good result. The result is verified by the geochemical mapping project which is jointly conducted by the China Geological Survey and the Argentina Geological and Mineral Survey. |
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