Multifractal analysis of geochemical stream sediment data in Bange region, northern Tibet
Multifractal analysis of geochemical stream sediment data in Bange region, northern Tibet
复制标题
DOI：
10.1007/s12583-015-0538-7
复制
发表时间：
2015-06
影响因子：
3.3
通讯作者：
Xianzhong Ke;S. Xie;Youye Zheng;S. F. Awadelseid;Shunbao Gao;L. Tian
中科院分区：
文献类型：
--
作者：
Xianzhong Ke;S. Xie;Youye Zheng;S. F. Awadelseid;Shunbao Gao;L. Tian
本研究的目的是定量分析水系沉积物中地球化学元素的分布模式，进而圈定有利找矿区。在西藏北方班戈地区4个分区共采集水系沉积物样品7270个，采集岩（矿）片样品37个。用矩量法描述了Au、Ag、As、Cu、Mo、Pb、Zn、W、Sn、Bi、Sb、Hg等12种元素的多重分形谱，并用5个定量的多重分形参数表征了它们的多重分形谱。结果表明，贡玛地区Cu、Bi的多重分形特征明显强于其它亚区。该地区Cu和Bi的多重分形谱的不对称指数和方差系数均最高，表明贡玛地区Cu和Bi的分布格局最不均匀。这些多重分形参数表明，贡玛地区是找铜、铋的最有利地区。用矩量法计算的结果与石油化学分析和现场观测结果相吻合。多重分形分析可作为评价该区成矿潜力的有效工具，为化探工作提供新的思路。
The aim of this study is to quantify the geochemical elements distribution patterns analyzed from stream sediment data and then to delineate favorable areas for mineral exploration. A total of 7 270 stream sediment samples were collected from four subareas and 37 rock (ore) chip samples from five different locations in the Bange region, northern Tibet (China). The multifractal spectra of 12 elements including Au, Ag, As, Cu, Mo, Pb, Zn, W, Sn, Bi, Sb and Hg are represented by the method of moments, and characterized by five quantitative multifractal parameters. The results show that the multifractality for Cu and Bi in the Gongma area is much stronger than those in other subareas. Both the asymmetry index of multifractal spectra and the variance coefficients of Cu and Bi in this area are the highest, which imply that the distribution pattern of Cu and Bi in the Gongma area is the most heterogeneous. These multifractal parameters indicate that the Gongma area is the most favorable for prospecting Cu and Bi. The results obtained by the method of moments are in agreement with petrochemical analysis and field observation. It is suggested that multifractal analysis can be used as an effective tool to evaluate the ore-forming potential in the study area and to provide new approaches for geochemical exploration.