| 金伯利岩型金刚石找矿准则和找矿判别模型 |
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| 引用本文： | 张文宽,杨本锦.金伯利岩型金刚石找矿准则和找矿判别模型[J].矿床地质,1988,7(3):71-78. |
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| 作者姓名： | 张文宽 杨本锦 |
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| 作者单位： | 四川省地矿局403地质队，四川省地矿局403地质队 |
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| 摘 要： | 本文在深入研究金伯利岩型金刚石矿床成矿规律的基础上,总结了此类矿床的找矿准则并建立了找矿判别模型。模型共包含16个变量,其中地质因素3个,特征矿物5个,岩石化学8个。模型临界值为24.1—65.5。得分大于65.5的岩体为寻找金刚石的重要对象;得分小于24.1的岩体据目前认识水平为不含金刚石岩体;介于两者之间者为可疑岩体。此判别模型综合吸收了前人寻找此类矿床的经验,并将其抽象为定量预测。我们已将此方法用 BASIC 语言编成计算机程序,这将有助于在较大范围内,较迅速、较准确地寻找金刚石矿床。
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| 关 键 词： | 金伯利岩 金刚石 找矿准则 判别模型 |
Ore-prospecting criteria and discriminant model for kimberlite type diamonds |
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| Abstract: | Based on extensive investigation into the geologic settings, typomorphic minerals and petrochemical characters of kimberlites containing or not containing diamonds as well as similar rocks both from China and abroad, the present paper summarizes ore-prospecting criteria for kimberlite-type diamond deposits and, by utilizing the computer on the principle of mathematical geology, sets up an ore-prospec ting discriminant model for this type of deposits. The model includes 16 variables, which are composed of 3 geologic factors, 5 characteristic minerals and 8 petrochemical variables. The results obtained by applying the model back to the training samples show that the lowest score of the diamond-bearing kimberlites is 65.5 and, in the prognostic area, the rock bodies having values larger than 65.5 are important targets in search for diamonds; the highest score of kimberlites containing no diamonds is 24.1; Rock bodies having scores in the range of 24.1-65.5 are regarded as suspicious ones, for which some more geologic work should be done. The correctness of this performance reaches 100 percent. This discriminant model has absorbed integratedly experience gained by drevious workers prospecting for kimberlites, and, through abstracting the data mathematically, raised the level to the quantitative prognosis, thus avoiding one-sidedness whic h arises from looking at the problem from one angle and using one method. The authors have prepared a computer program for this method by using Basic Language, which makes it possible to find the diamond target rapidly and correctly in a fairly large area, and therefore speeds up the diamond-prospecting work. |
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