The application of projection pursuit model combined with RAGA to identifying stream sediment geochemical anomalies: A case study of a Zn-Pb deposit in Hunan Province
The anomalies composed of ore-forming elements may not correspond with the known deposits. Some trace elements are accumulated during the mineralization process whereas some elements are depleted. The combination of the ore-forming elements and other trace elements influenced by mineralization may enhance the effect of geochemical exploration. In this study, high-dimensional data were converted into one-dimensional data for analysis by projection pursuit model based on RAGA. The projection values and the weights of elements can be calculated by this method. Moreover, important information will not be lost and the noise data will be deleted. In addition, this method is very robust. By the case study of a Pb-Zn deposit, it is found that some deposits are not in anomaly areas or some deposits do not have corresponding anomalies. However, the ranges of anomalies obtained by this method correspond with the known deposits better. The results of PPC highlights the anomalies associated with the known deposits and, moreover, the anomaly information has not been lost. The projection pursuit model combined with RAGA by using multiple elements performs better on high dimensional data and identifies stream sediment geochemical anomalies effectively and accurately.
郝立波, 田密, 赵新运, 赵昕, 张瑞森, 谷雪. 基于实码加速遗传算法的投影寻踪模型在圈定水系沉积物地球化学异常中的应用——以湖南某铅锌矿床为例[J]. 物探与化探, 2016, 40(6): 1151-1156.
HAO Li-Bo, TIAN Mi, ZHAO Xin-Yun, ZHAO Xin, ZHANG Rui-Sen, GU Xue. The application of projection pursuit model combined with RAGA to identifying stream sediment geochemical anomalies: A case study of a Zn-Pb deposit in Hunan Province. Geophysical and Geochemical Exploration, 2016, 40(6): 1151-1156.
[1] 季克俭,王立本,吕凤翔,等.热液矿床的负晕和地球化学场系[J].地质学报,1992,66(4):350-361.
[2] 马生明,朱立新,刘海良,等.甘肃北山辉铜山铜矿地球化学异常结构研究[J].地球学报,2011,32(4):405-412.
[3] 朴寿成,刘树田,姜寒冰,等.地球化学负异常及其找矿意义[J].地质与勘探,1996,32(2):46-50.
[4] 孙承辕,张干.漠滨金矿区外围地层及矿区围岩中金的负异常及其地球化学意义[J].地质与勘探,1993,29(3):47-52.
[5] Goldberg I S,Abramson G Y,Los V L.Depletion andenrichment of Primary haloes:their importance in the genesisof and exploration for mineral deposits[J].Geochemistry:Exploration,Environment,Analysis,2003,3(3):281-293.
[6] Robertson I D M,Taylor G F.Depletion haloes infresh rocks surrounding the Cobarorebodies,N.S.W.,Australia:implications for exploration and ore genesis[J].Journal of Geochemical Exploration,1987,27(1-2):77-101.
[7] Shi C Y,Wang C F.Regional geochemical secondary negative anomalies and their significance[J].Journal of Geochemical Exploration,1995,55(1-3):11-23.
[8] 马生明,朱立新,唐世新,等.甘肃北山白山堂铜矿外围找矿靶区地球化学评价方法示范[J].地球学报,2013,34(3):338-346.
[9] 马生明,朱立新,刘海良,等.甘肃北山辉铜山铜矿地球化学异常结构研究[J].地球学报,2011,32(4):405-412.
[10] Friedman J H,Turkey J W.A projection pursuit algorithm forexploratory data analysis[J].IEEE Trans.On Computer,1974,23(9):881-890.
[11] 付强,赵小勇.投影寻踪模型原理及其应用[M].北京:科学出版社,2006,21-49.
[12] 肖凡.基于RAGA的PPC模型在个旧化探资料处理中的应用研究[D].武汉:中国地质大学,2008.
[13] 金菊良,张欣莉,丁晶.评估洪水灾情等级的投影寻踪模型[J].系统工程理论与实践,2002,22(2):140-144.
[14] 张军,梁川,赵燮京.基于RAGA的PPC模型在节水灌溉多方案择优中的应用[J].中国农村水利水电,2006(12):141.
[15] Liu C H.The application of PPC model using RAGA in soil quality evaluation[J].Journal of Heilongjiang Hydraulic Engineering College,2005,32(1):7.
[16] 郝立波,李巍,陆继龙,等.确定岩性复杂区的地球化学背景与异常的方法[J].地质通报,2007,26(12):1531.
[17] 赵禹,赵玉岩,郝立波,等.利用快速聚类分析分区确定化探背景上限的方法[J].物探化探计算技术,2014,36(4):487-491.
[18] 焦保权,白荣杰,孙淑梅,等.地球化学分区标准化方法在区域化探信息提取中的应用[J].物探与化探,2009,33(2):165-169.
[19] 金菊良,杨晓华,丁晶.基于实数编码的加速遗传算法[J].四川大学学报:工程科学版,2000,32(4):1-5.
[20] 刘慧卿,张先起,杨会娟.基于RAGA的投影寻踪模型在土壤重金属污染评价中的应用[J].河南农业科学,2005,34(10):60-63.