山东大尹格庄金矿蚀变岩中矿体分布稳定性的动力学控制参量探讨

Discussion on the kinetic controlling parameter of the stability of orebody distribution in altered rocks in the Dayingezhuang gold deposit,Shandong

元素品位分布的相依性指标——赫斯特指数(Hurst指数)是矿体分布稳定性的动力学控制参量,重标极差(R/S)分析是相依性分析的有效方法。利用R/S分析对胶东大尹格庄金矿黄铁绢英岩内不同勘探线金元素品位系列的Hurst指数计算发现,Hurst指数主要介于0.59至0.89之间,均值为0.75,标准差为0.09,均大于随机行走经验Hurst指数的均值与标准差;计算结果说明元素品位分布存在正相关性,但由于受多种因素影响,其空间分布的相依性具有一定波动。元素品位分布的正相依性显示在特定的地质背景内,矿体连续分布或者间断出现,发育相对稳定,其与大尹格庄金矿的地质事实相吻合。

Persistence exponent （Hurst exponent） of element grade distribution is the important controlling parameter for the stability of orebody distribution, and R/S analysis is a valid calculating method for Hurst exponent. The calculations of Hurst exponent of the series of Au grades in different exploration lines in the Dayingezhuang gold deposit via R/S analysis show the Hurst exponents range between 0.64 and 0.83, their mean value and variance are 0.75 and 0.09 respectively, which are both bigger than those of the empirical Hurst exponents of random walk. The results show the element distribution belongs to biased random walk and is positive persistence; yet the distribution fluctuates much in space affected by many geological factors. The positive persistence of element distribution in the beresitization altered rock suggests the development of orebodies is relatively stable and they appear continually or repeatedly in this specific geologic background, which corresponds to the geological facts in the Dayingezhuang gold deposit.