含量-面积分形法与传统统计法确定异常下限的对比研究——以西藏阿翁错地区水系沉积物测量Au元素为例
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摘要
西藏阿翁错地区位于班公湖—怒江成矿带西段,通过对该地区水系沉积物测量Au元素测试数据进行分析,分别运用含量-面积分形法和传统统计法提取异常下限,并圈定异常,结果显示:含量-面积分形法能更好的展现元素分形分布特征,并揭示出研究区Au元素异常的分布是两次不同地质活动的结果,为研究区的找矿工作提供了有益的参考。
Awengcuo area in Tibet is located in the western section of Bangong Lake-Nujiang metallogenic belt.Based on the analysis of Au element measurement data of stream sediments in this area,the content-area fractal method and the traditional statistical method are used to extract the lower limit of anomalies and delineate the anomalies respectively.The results show that the content-area fractal method can better display the elements.The fractal distribution characteristics reveal that the distribution of Au anomaly in the study area is the result of two different geological activities,which provides a useful reference for the prospecting work in the study area.
Awengcuo area in Tibet is located in the western section of Bangong Lake-Nujiang metallogenic belt.Based on the analysis of Au element measurement data of stream sediments in this area,the content-area fractal method and the traditional statistical method are used to extract the lower limit of anomalies and delineate the anomalies respectively.The results show that the content-area fractal method can better display the elements.The fractal distribution characteristics reveal that the distribution of Au anomaly in the study area is the result of two different geological activities,which provides a useful reference for the prospecting work in the study area.
引文
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[2]崔晓亮,刘婷婷,王文恒,等.东昆仑布青山地区水系沉积物测量地球化学特征及找矿方向[J].物探与化探,2011,35(5):573-578.
[3]汤正江,程治民,洪大军.太平沟水系沉积物异常特征及找矿效果[J].物探与化探,2011,35(5):584-587.
[4]李长江,麻土华.矿产勘查中的分形、混沌与ANN[M].北京:地质出版社,1999.
[5] B.BOLVIKEN,STOKKE P R,FEDER J,et al.The fractal nature of geochemical landscapes[J].Journal of Geochemical Exploration,1992,43(2):91-109.
[6] XIE Xuejin,YIN Binchuan.Geochemical patterns from local to global[J].Journal of Geochemical Exploration,1993,47(1):109-129.
[7] ALLEGRE C J,LEWIN E.Scaling laws and geochemical distributions[J].Earth&Planetary Science Letters,1995,132(1/4):1-13.
[8]施俊法.地球化学现象的分形特性及其意义[J].国外地质勘探技术,1996(3):16-20.
[9]成秋明.多维分形理论和地球化学元素分布规律[J].地球科学(中国地质大学学报),2000,25(3):311-318.
[10]谢淑云,鲍征宇.地球化学场的连续多重分形模式[J].地球化学,2002,31(2):191-200.
[11] XIE Shuyun,CHENG Qiuming,XING Xitao,et al.Geochemical multifractal distribution patterns in sediments from ordered streams[J].Geoderma,2010,160(1):36-46.
[12]宋扬,唐菊兴,曲晓明,等.西藏班公湖—怒江成矿带研究进展及一些新认识[J].地球科学进展,2014,29(7):795-809.
[13]曲晓明,王瑞江,代晶晶,等.西藏班公湖—怒江缝合带中段雄梅斑岩铜矿的发现及意义[J].矿床地质,2012,31(1):1-12.
[14]马东,刘波,张智霖,等.西藏商旭金矿地质特征及找矿标志阶段性认识[J].地球,2012(9):12-14.
[15]杜德道,曲晓明,王根厚,等.西藏班公湖—怒江缝合带西段中特提斯洋盆的双向俯冲:来自岛弧型花岗岩锆石U-Pb年龄和元素地球化学的证据[J].岩石学报,2011,27(7):1993-2002.
[16]曲晓明,王瑞江,辛洪波,等.西藏西部与班公湖特提斯洋盆俯冲相关的火成岩年代学和地球化学[J].地球化学,2009,38(6):523-535.
[17] CHENG Q,AGTERBERG F P,BALLANTYNE S B.The separation of geochemical anomalies from background by fractal methods[J].Journal of Geochemical Exploration,1994,51(2):109-130.
[18]邹林,彭省临,杨自安,等.青海阿尔茨托山地区地球化学(异常)场的多重分形研究[J].中国地质,2004,31(4):436-441.
[19]刘世宝,陈鑫,国显正,等.分形(多重分形)在区域化探数据处理中的应用:以柴北缘荒漠戈壁景观区为例[J].物探与化探,2016,40(3):550-556.