1:25万宣城幅(安徽境内)水系沉积物元素地球化学特征及其在侵入岩体判别上的应用
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摘要
水系沉积物地球化学测量获得的数据在基础地质研究中可发挥重要作用。通过对1:25万宣城幅(安徽境内)水系沉积物元素地球化学特征进行研究,获得了宣城幅元素平均值、背景值、标准离差、变异系数等地球化学参数以及区域上的富集特征。花岗岩类水系沉积物继承了其母岩富高场强元素贫相容元素的地球化学特征,以此为基础构建了推断花岗岩类侵入体的地球化学模型,利用该模型绘制的地球化学图中的高值区界线与宣城幅内花岗岩类侵入体的地表出露范围十分吻合,从而验证了地球化学推断花岗岩类侵入体模型的可行性,并进一步预测了可能存在花岗岩类侵入体的地区及分布范围。
The data obtained from geochemical measurements of sediments can play an important role in basic geological research. By studying the geochemical characteristics of sediment elements in the 1 :250000 xuan-cheng Sheet( Anhui province), geochemical parameters such as mean value, background value, standard deviation, coefficient of variation and regional enrichment were obtained. Based on the geochemical characteristics of the rich high field strength and poor compatible elements of the granitic intrusions,the geochemical inferred model of the intrusive granite is constructed. The boundary of high value area in geochemical map drawn by this model is in good agreement with the surface exposure range of the granite invader in Xuan-cheng sheet, which verifies the feasibility of geochemical inference of the granite invader model. The area and distribution range of granite invader were predicted.
The data obtained from geochemical measurements of sediments can play an important role in basic geological research. By studying the geochemical characteristics of sediment elements in the 1 :250000 xuan-cheng Sheet( Anhui province), geochemical parameters such as mean value, background value, standard deviation, coefficient of variation and regional enrichment were obtained. Based on the geochemical characteristics of the rich high field strength and poor compatible elements of the granitic intrusions,the geochemical inferred model of the intrusive granite is constructed. The boundary of high value area in geochemical map drawn by this model is in good agreement with the surface exposure range of the granite invader in Xuan-cheng sheet, which verifies the feasibility of geochemical inference of the granite invader model. The area and distribution range of granite invader were predicted.
引文
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郝立波,李巍,陆继龙.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):1531-1535.
蒋敬业,程建萍,祁士华,等.应用地球化学[M].武汉:中国地质大学出版社,2006.
向运川,龚庆杰,刘荣梅,杨万志.区域地球化学推断地质体模型与应用一以花岗岩类侵人体为例.岩石学报,2014,30(9):2609-2618.
刘海鹏,鹿志忠.埃塞俄比亚北部阿斯格德地区地球化学异常特征与找矿意义.[J].矿产勘查,2017,8(4):682-690.
张景,陈国光,张明,等.宁芜盆地白象山矿区物化探异常特征及找矿意义[J].华东地质,2016,37(2):147-151.
杨少平,刘华忠,孔牧,等.羌塘高原典型矿区水系沉积物地球化学特征与区域化探扫面方法[J].地球学报,2015,36(3):367-376.
Cheng HX,Li M,Zhao CD,Li K,Peng M,Qin AH and Cheng XM. 2014.Overview of trace metals in the urban soil of 31 metropolises in China. Journal of Geochemical Exploration, 139:31-52.
Deng J,Wang QF, Yang LQ,Wang YR,Gong QJ and Liu H. 2010.Delineation and explanation of geochemical anomalies using fractal models in the Heqing area, Yunnan Province,China. Journal of Geochemical Exploration, 105(3):95-105.
陈富荣,史春鸿,梁红霞.中国南部湿润半湿润丘陵山区不同粒级水系沉积物地球化学特征对比研究[J].岩矿测试,2017,36(2):136-145.
向运川,任天祥,牟绪赞,等.化探资料应用技术要求.北京:地质出版社,2010.8.
史长义,任院生.区域化探资料研究基础地质问题.地质与勘探[J],2005,41(3):53-58.
王会锋,叶柱才.1:20万区域地球化学资料在基础地质研究中的应用.地质与勘探[J],2007,31(5):473-476.
吴新民,金洋,翁志华.南京及周边地区土壤地球化学特征及基础地质应用探讨.江苏地质[J],2007,31(3):180-186.
戴圣潜,周存亭,储东如,等.1:25万宣城市幅区域地质调查报告[R].安徽:安徽省地质调查院,2005.