成矿预测单元的基本概念及其划分方法

BASIC CONCEPT OF GEOSTATISTICAL CELLS OF MINEROGENIC PROGNOSIS AND ITS DIVISION METHOD

本文提出了依据于地质体的地质统计单元的基本特征及地质意义,同时给出了单元定义域和边界条件的概念和研究方法。根据各种矿产预测具体实践,作者探讨了成矿预测单元划分的一般方法,并在金属及非金属矿的成矿预测中加以运用,取得了明显的效果。

The division of geostatistical cells has become more and more important with the wide application of the quantitative study in minerogenic prognosis because it directly influences the results of minerogenic prognosis.This paper deals with the general attribute of geostatistical cells and points out some deficiencies of the network cells. First, the geological meaning of network cells is not so clear. Second, regular network cells are not suited to random distri bution of geological bodies and deposits, therefore they are bound to cause distortion of the statisticel law of geostatistical cells. Third, the indeterminateness of the size of network cells will certainly influence the stability of the results of minerogenic prognosis.The basic characteristic and geological meaning of geostatistical cells based on geological bodies are expounded in this paper. Also the concept and research method of the domain of definition and boundary conditions of the cells were developed. The domain of definition of geostatistical cells refers to synthetical information conditions, including geological, geophysical, geochemical and remote sensing conditions which control mineralization and distributions of ore deposits. The boundary of geostatistical cells refers to the minimum threshold value of mineralization. Any such value below it will not give rise to a mineral deposit.According to the concrete practice of prediction of various mineral deposits, the author approaches the general division principle and method of geostatistical cells based on geological bodies. The method of cell division has been applied to minerogenic prediction of gold, fluorite and skarn deposits. As a result, four small to middle-sized gold deposits, a silver deposit and seven large-sized fluorite deposits have been discovered.