摘要
本文在Ａｇｔｅｒｂｅｒｇ和Ｄｉｖｉ（１９７８）的地壳丰度地质统计模型（ＣｒｕｓｔａｌＡｂｕｎｄａｎｃｅＧｅｏｓｔａｓｔｉｃｓ，简称ＣＡＧ）的基础上，提出了一种成矿省成矿元素区域背景值下限的简易计算方法。在区域背景值未知的情况下，根据成矿省某成矿元素的截切品位和金属量，可由此法计算出其地壳平均丰度最小值，以此作为成矿省中该元素区域背景值。将这一方法运用于华南Ｓｂ成矿省所得Ｓｂ元素区域背景值与通过区域地球化学方法得到的华南地区Ｓｂ的地壳平均丰度值相近，这充分说明这种地壳平均丰度最小值法的可靠性。
s The authors hypothesize the lognormal distribution of metal element in the crust of metallogenic province and deduce the minimum crustal abundance form the crustal abundance geostatistics of Argterberg and Divi(1978).We may use this simple method to determine the lower boundary of metal crustal abundance in metallogenic province if the cut off grade and metal tonnage are known in a specific amount of the crust.An example of the south_China antimony metallogenic province is taken;the resultant is correspondent to the observed crustal abundance in the region,when the circulation of underground water is supposed to have a depth of 5～10 kilometers.In this deep circulation of underground water,the possible maximum temperature of about 85～310℃ at the exit as the pipe model indicates,complies with the homogeneous temperature in the inclusion of vein in the antimony deposits such as the superlarge antimony deposit.
基金
国家自然科学基金
关键词
地壳
平均丰度
最小值
成矿
背景值
成矿元素
crustal abundance geostatistics minimun crustal abundance south_China antimony metallogenic province
