土壤微细粒测量地球化学模式的再现性与可对比性
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摘要
不同采样密度、不同采样时间是否可以获得稳定的和可追索的地球化学模式是检验地球化学方法技术可靠与否的重要依据。笔者选择干旱戈壁荒漠区——甘肃柳园花牛山矿区开展不同采样密度、不同采样时间的土壤微细粒测量工作,对比了所获得的地球化学数据和地球化学分布模式。结论如下:土壤微细粒地球化学调查获得的元素含量中位值和背景值非常接近,地球化学分布模式在形态和变化趋势上非常相似,浓集中心位置重合,表明可获得稳定的、可追索的地球化学分布模式;采样密度越大数据离散程度越高,表明元素分布的局部不均一性,正是这种局部的不均一性才能通过加密采样刻画出地球化学模式的细节变化,为逐步追踪矿化体奠定基础。
The problem as to whether a stable and traceable geochemical model can be obtained by different sampling densities and different sampling time spans constitutes an important basis for testing the reliability of geochemical methods. In this paper,the authors conducted fine sampling densities and sampling time spans over the Huaniushan Pb-Zn deposit of Gansu Province. The conclusions are as follows: the media values and background values of elements obtained by different sampling densities and different sampling time spans are consistent,the geochemical patterns are very similar and reproducible,and so the stable and traceable geochemical patterns can be achieved. The larger the sampling spacing,the more scattered the values,suggesting that the distribution of elements is characterized by local heterogeneity. It is thus held that researchers can portray the details of changes of geochemical patterns and further track the mineralization bodies by increasing the sampling density.
The problem as to whether a stable and traceable geochemical model can be obtained by different sampling densities and different sampling time spans constitutes an important basis for testing the reliability of geochemical methods. In this paper,the authors conducted fine sampling densities and sampling time spans over the Huaniushan Pb-Zn deposit of Gansu Province. The conclusions are as follows: the media values and background values of elements obtained by different sampling densities and different sampling time spans are consistent,the geochemical patterns are very similar and reproducible,and so the stable and traceable geochemical patterns can be achieved. The larger the sampling spacing,the more scattered the values,suggesting that the distribution of elements is characterized by local heterogeneity. It is thus held that researchers can portray the details of changes of geochemical patterns and further track the mineralization bodies by increasing the sampling density.
引文
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[21]张必敏,王学求,徐善法,等.盆地金属矿穿透性地球化学勘查模型与案例[J].中国地质,2016,43(5):1697-1709.
[22]刁理品.沟系土壤地球化学测量在贵州普晴锑金矿勘查区应用与找矿效果[J].地质与勘探,2010,46(1):120-127.
[23]席明杰,马生明,刘崇民,等.内蒙古准苏吉花铜钼矿区土壤地球化学异常特征与评价[J].地质与勘探,2013,49(2):337-345.
[2]王学求.荒漠戈壁区超低密度地球化学调查与评价——以东天山为例[J].新疆地质,2001,19(3):200-206.
[3]刘汉粮,张必敏,刘东盛,等.土壤微细粒全量测量在甘肃花牛山矿区的应用[J].物探与化探,2016,40(1):33-39.
[4]杨建国,翟金元,杨宏武,等.甘肃北山地区花牛山铅锌矿区玄武岩锆石LA-ICP-MS U-Pb定年及其地质意义[J].地质通报,2010,29(7):1017-1023.
[5]聂风军,江思宏,白大明.北山地区金属矿床成矿规律及找矿方向[M].北京:地质出版社,2002.
[6]朱江,吕新彪,曹晓峰,等.甘肃花牛山铅锌金矿床地质特征及成矿物质来源[J].矿床地质,2010,29(增刊):1033-1034.
[7]何智祖,曹俊,董钦伟.甘肃北山花牛山东金矿床地质特征及找矿思路[J].甘肃冶金,2012,34(3):74-78.
[8]代文军.甘肃北山花牛山金银铅锌矿床成因探讨[J].华南地质与矿产,2010(3):25-33.
[9]殷勇,殷先明.甘肃北山重要金属矿床类型与找矿预测[J].甘肃地质,2008,17(2):9-18.
[10]刘德长.区域控矿断裂带的航空高光谱遥感技术研究——以黑石山—花牛山深大断裂带为例[J].地质与勘探,2015,51(2):366-375.
[11]张必敏,迟清华,张永勤.干旱荒漠覆盖区隐伏金矿上方覆盖层三维地球化学分布模式[J].地学前缘,2012,19(3):130-137.
[12]赵善定,王学求.荒漠戈壁区地表疏松层中元素的分布规律[J].物探与化探,2006,30(6):517-520.
[13]赵善定.荒漠戈壁区地表覆盖层中元素的分布规律与存在形式[D].西安:长安大学,2005:12-15.
[14]杜佩轩.新疆北部干旱荒漠区勘查地球化学得方法研究与应用效果[G]//第四届勘查地球化学学术讨论会论文选编.武汉:中国地质大学出版社,1991.
[15]刘汉粮,王学求,张必敏,等.岩屑测量和土壤微细粒测量在沙泉子铜镍矿的应用[J].物探与化探,2015,39(2):228-233.
[16]Wang X Q,The CGB Sampling Team.China geochemical baselines:Sampling methodology[J].Journal of Geochemical Exploration,2015,148:25-39.
[17]张勤,白金峰,王烨.地壳全元素配套分析方案及分析质量监控系统[J].地学前缘,2012,19(3):33-42.
[18]迟清华,鄢明才.应用地球化学元素丰度数据手册[M].北京:地质出版社,2008,88-112.
[19]中国科学院地球化学研究所.高等地球化学[M].北京:科学出版社,1998.
[20]王学求,张必敏,叶荣.纳米地球化学与覆盖区矿产勘查[J].矿物岩石地球化学通报,2016,35(1):43-51.
[21]张必敏,王学求,徐善法,等.盆地金属矿穿透性地球化学勘查模型与案例[J].中国地质,2016,43(5):1697-1709.
[22]刁理品.沟系土壤地球化学测量在贵州普晴锑金矿勘查区应用与找矿效果[J].地质与勘探,2010,46(1):120-127.
[23]席明杰,马生明,刘崇民,等.内蒙古准苏吉花铜钼矿区土壤地球化学异常特征与评价[J].地质与勘探,2013,49(2):337-345.