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物探与化探  1985, Vol. 9 Issue (1): 1-8    
  论文 本期目录 | 过刊浏览 | 高级检索 |
区域化探样品元素测定几个问题的探讨
孙焕振
A PRELIMINARY DISCUSSION ON SOME PROBLEMSCONCERNING THE REQUIREMENTS IN ELEMENTDETERMINATION FOR SAMPLES FROMREGIONAL GEOCHEMICAL PROSPECTING
Sun Huanzhen
Bureau of Geophysical and Geochemical Exploration, Ministry of Geology and Mineral Resources
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摘要 

化探样品元素测定的要求,因任务的不同而异。区测与普查相比其要求不同。在普查(及详查)阶段,工作限定在较小的范围内,可能发现的矿种有限或可以预测,测定元素的数目也相应较少(约20种元素).普查的测网较密,主要是圈出含量和衬度较高的异常内带,对灵敏度和准确度要求可以低些。区域化探主要是发现强度低、衬度低而范围大的区域地球化学异常,而且做为地球化学基础资料,是按分幅扫面,最后要拼缩成全国性的地球化学图。由于图幅间的对比拼接,要求较高的灵敏度和准确度。在区测中凡是能形成独立矿产的元素(包括稀有分散元素)以及有指示意义的伴生元素都要测定。区测化探不但用于找矿,目前日益为区域地质、自然区划、环境保护和农林畜牧的研究,提供重要的地球化学资料。目前测定的元素包括成岩特征元素在内已达39种。文中还探讨了在我国目前化验水平和能力的情况下,完成区测化探样品测定的方法和工作步骤。

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关键词 活动态测量相态分析选择性提取滤材选择    
Abstract

The requirements in determination of elements for geochemical samples are different with diverse tasks, as demonstrated by the different requirements for regional survey and for reconnaissance. During the reconaissance as well as the detailed investigation stage, the prospecting work is confined to a comparatively small area, the types of ore likely to be found are quite limited or are predictable, and the elements to be analysed are accordingly fewer (about 20) in number. The relatively crowded measuring networks for the reconnaissance are designed mainly to delimit the inner zones of the anomalies which have markedly high contents and contrast values of elements. Therefore element determination in this stage requires less precision and accuracy than that in regional survey stage. In contrast, the regional survey on the scale of 1:200,000 aims at detecting regional geochemical anomalies characterized by low intensities, low contrast values and vast covering areas. Moreover,as a means to acquire basic geochemical data, its working method involves doing geochemical work according to map areas and then constructing a nationwide geochemical map by piecing together the obtained areas maps at a reduced scale. The correlation and peicing together of adjacent map areas demand considerably high sensitivity and accuracy. In regional survey,determination ought to be made for all elements, including the rare elements, that are likely to form independent ore deposits, and for accompanying elements which may serve as indicators. Not only has the regional geochemical prospecting been widely used in mineral exploration, but it provides increasing quantities of valuable geochemical data for such research fields as regional geology, natural xegionalization,environmental protection,and farming, forestry as well as animal husbandry. At present, 39 elements can be analysed, including the major characteristic diagenetic elements. Some preliminary ideas have also been put forward in this paper as to the suitable measures to be adopted for satisfactorily completing the determination of regional geochemical samples under the present conditions of chemical analysis in China.

Key wordsMOMEO survey    phase state analysis    selective leach    filters optimization
     出版日期: 1985-02-24
引用本文:   
孙焕振. 区域化探样品元素测定几个问题的探讨[J]. 物探与化探, 1985, 9(1): 1-8.
Sun Huanzhen. A PRELIMINARY DISCUSSION ON SOME PROBLEMSCONCERNING THE REQUIREMENTS IN ELEMENTDETERMINATION FOR SAMPLES FROMREGIONAL GEOCHEMICAL PROSPECTING. Geophysical and Geochemical Exploration, 1985, 9(1): 1-8.
链接本文:  
https://www.wutanyuhuatan.com/CN/      或      https://www.wutanyuhuatan.com/CN/Y1985/V9/I1/1

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