五河地区朱顶—石门山断裂带构造地球化学研究
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摘要
运用构造地球化学方法对五河地区朱顶—石门山韧性剪切带及两盘岩石进行主微量元素研究,结果表明:自断裂带两侧围岩向内带SiO_2、TiO_2含量渐次递增,Al_2O_3、Fe_2O_3、MgO、K_2O含量渐次递减,CaO、Na_2O、灼失量呈现双峰折线状,表明主量元素受控于该剪切带的构造作用;微量元素中Au与Cu、Pb、Mo、Ag、Zn则呈良好的变化关系,相关系数分别为0. 99、0. 97、0. 96、0. 96、0. 81,可作为该区良好的找金标志。根据断裂带微量元素的聚类分析,表明Au、Ag、Pb、Zn、Cu、Bi为同一元素组合,暗示了金矿与铜矿、方铅矿、闪锌矿、银矿为伴生矿物。而Au与Pb、Mo元素的相关性研究表明,该区金矿属于中—高温热液成矿,充分证实断裂构造不仅对断裂带各类岩石元素有明显的控制作用,而且制约金矿的形成。
This paper emphasizes on the study of the major and minor elements by the tectono-geochemical methods on Zhuding-Shimenshan fault zone's ductile shear zone of Wuhe region. As the results illustrate,the contents of SiO_2,TiO_2 gradually increase along both sides of the wall rock to the inside of the fault zone,the contents of Al_2 O_3,Fe_2 O_3,MgO and K_2 O decrease and the ignition loss of CaO and Na_2 O curved as bimodal pattern. These above-mentioned phenomena indicate that the major elements are influenced by the tectonism within the fault zone. Moreover,the correlation index between minor elements Au and Cu,Pb,Mo,Ag,Zn in the ductile shear fault and both hanging wall and footwall are 0. 99,0. 97,0. 96,0. 96 and 0. 81 respectively,which shows that the peaks of the above-mentioned elements are good prospecting criteria for gold ore. The cluster analysis on minor elements in the fault zone indicates that the Au,Ag,Pb,Zn,Cu and Bi belong to the same elements composition and that proves gold ore is associated with copper,galena,sphalerite and silver ore. The correlation index between Au and Pb,Mo suggests that the gold ore in the resea area is medium-hypothermal mineralization. As a result,fault structure affects the chemistry elements of various rock and controls the gold ore significantly in the study area.
This paper emphasizes on the study of the major and minor elements by the tectono-geochemical methods on Zhuding-Shimenshan fault zone's ductile shear zone of Wuhe region. As the results illustrate,the contents of SiO_2,TiO_2 gradually increase along both sides of the wall rock to the inside of the fault zone,the contents of Al_2 O_3,Fe_2 O_3,MgO and K_2 O decrease and the ignition loss of CaO and Na_2 O curved as bimodal pattern. These above-mentioned phenomena indicate that the major elements are influenced by the tectonism within the fault zone. Moreover,the correlation index between minor elements Au and Cu,Pb,Mo,Ag,Zn in the ductile shear fault and both hanging wall and footwall are 0. 99,0. 97,0. 96,0. 96 and 0. 81 respectively,which shows that the peaks of the above-mentioned elements are good prospecting criteria for gold ore. The cluster analysis on minor elements in the fault zone indicates that the Au,Ag,Pb,Zn,Cu and Bi belong to the same elements composition and that proves gold ore is associated with copper,galena,sphalerite and silver ore. The correlation index between Au and Pb,Mo suggests that the gold ore in the resea area is medium-hypothermal mineralization. As a result,fault structure affects the chemistry elements of various rock and controls the gold ore significantly in the study area.
引文
[1]翟东兴.断裂构造微量元素地球化学特征初步研究[J].中国科技信息,2013(10):33-34.
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[3] L. Weiss,I. E.,Wenk,H. R.. Experimentally produced pseudotachylitelike vein in gabbro[J]. Tectonophysics,1983,96(3/4):299-310.
[4] J. Chester,F. M.,Logan,J. M.. Composite planar fabric of gouge from the Punchbowl fault,California[J]. Journal of Structural Geology. 1987,9(5/6):621-634.
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[8]孙岩,舒良树,郭继春,等.赣北变质核杂岩剪切带中断层岩的构造地球化学分析[J].自然科学进展,2002,12(12):1274-1279.
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[11]李建设,吴礼彬,金世恒.蚌埠隆起区金矿控矿条件及找矿信息标志研究[J].安徽地质,2002,12(1):49-55.
[12]万仁虎.大巩山金矿床构造控矿作用分析[J].地质与资源,2004,13(3):143-147.
[13]董法先,李中坚,陈柏林,等.安徽省五河县大巩山—荣渡地区金矿控矿构造和找矿方向[M].北京:地质出版社,1995:1-176.
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[15]陈皓龙,刘国生.郯庐断裂带(五河段)演化特征与矿化关系研究[J].合肥工业大学学报(自然科学版),2014,37(11):1353-1360.
[16] Zhao G C,Zhai M G. Lithotectonic elements of Precambrian basement in the North China Craton:Review and tectonic implications[J].Gondwana Res,2013,23(4):1207-1240.
[17] Liu Y C,Wang A D,Li S G,et al. Composition and geochronology of the deep-seated xenoliths from the southeastern margin of the North China Craton[J]. Gondwana Res,2013,23(3):1021-1039.
[18]王娟,盛勇,卜香萍,等.五河杂岩的变质岩石学及P-T条件分析:来自蒙城南ZK02钻孔的研究[J].地质科学,2014(2):556-575.
[19]聂峰,石永红,张忠宝,等.安徽北部郯庐断裂两侧基底岩石年龄及对郯庐断裂初始开启时间的限定[J].科学通报,2015,60(24):2315-2326.
[20]安徽省地质矿产勘查局.安徽省区域地质志[M].北京:地质出版社,1987:262-468.
[21]冉崇珍,涂荫玖.五河地区紫苏麻粒岩岩石学特征初探[J].安徽地质,1993,3(3):26-28.
[22]刘国生,宋传中,王道轩,等.郯庐断裂(K2-E)的伸展活动及其对合肥盆地的控制[J].合肥工业大学学报(自然科学版),2002,25(5):672-677.
[23]戴绪丁.火试金富集—电感耦合等离子体质谱法测定地质样品中痕量铂、钯、金[J].江西科学,2013,31(6):734-736.
[24]魏轶,窦向丽,巨力佩,等.四酸溶解—电感耦合等离子体发射光谱法测定金锑矿和锑矿石中的锑[J].岩矿测试,2013,32(5):715-718.
[25]孔芹.熔融法x射线荧光光谱测定岩石主成分含量[J].化学分析计量,2012,21(2):49-51.
[26]刘昌实,牟惟熹,辛克礼.岩石化学与多元统计[M].北京:地质出版社,1987:20-33.
[27]王嘉荫.应力矿物[M].北京:地质出版社,1978:10-45.
[28]王小风,李中坚,陈柏林,等.郯庐断裂带[M].北京:地质出版社,2000:269-321.
[29]刘英俊,曹励明.元素地球化学导论[M].北京:地质出版社,1985:22-85.
[30]韩吟文,马振东,张宏飞,等.地球化学[M].北京:地质出版社,2002:45-89.
[2] Kekulawala,K. R. S. S.. Hydrolytic Weeking in Quartz[J]. Tectonophysics,1978,46(1/2):1-6.
[3] L. Weiss,I. E.,Wenk,H. R.. Experimentally produced pseudotachylitelike vein in gabbro[J]. Tectonophysics,1983,96(3/4):299-310.
[4] J. Chester,F. M.,Logan,J. M.. Composite planar fabric of gouge from the Punchbowl fault,California[J]. Journal of Structural Geology. 1987,9(5/6):621-634.
[5]陈国达,黄瑞华.关于构造地球化学的几个问题[J].大地构造与成矿学,1984,8(1):7-18.
[6]涂光炽.构造与地球化学[J].大地构造与成矿学,1984,8(1):1-5.
[7]孙岩,徐十进,刘德良.断裂构造地球化学导论[M].北京:科学出版社,1998:1-45.
[8]孙岩,舒良树,郭继春,等.赣北变质核杂岩剪切带中断层岩的构造地球化学分析[J].自然科学进展,2002,12(12):1274-1279.
[9]杨为民,黄文辉.安徽淮南煤田南北缘断裂带构造地球化学特征[J].现代地质,2002,16(3):251-256.
[10]章邦桐,凌洪飞,陈培荣.多体系微量元素地球化学对比中存在的问题及解决途径[J].地质地球化学,2003,31(4):102-106.
[11]李建设,吴礼彬,金世恒.蚌埠隆起区金矿控矿条件及找矿信息标志研究[J].安徽地质,2002,12(1):49-55.
[12]万仁虎.大巩山金矿床构造控矿作用分析[J].地质与资源,2004,13(3):143-147.
[13]董法先,李中坚,陈柏林,等.安徽省五河县大巩山—荣渡地区金矿控矿构造和找矿方向[M].北京:地质出版社,1995:1-176.
[14]刘建民,陈柏林,孟宪刚,等.安徽五河大巩山金矿地质地球化学特征与矿床成因[J].矿床地质,1998,17(增刊):303-306.
[15]陈皓龙,刘国生.郯庐断裂带(五河段)演化特征与矿化关系研究[J].合肥工业大学学报(自然科学版),2014,37(11):1353-1360.
[16] Zhao G C,Zhai M G. Lithotectonic elements of Precambrian basement in the North China Craton:Review and tectonic implications[J].Gondwana Res,2013,23(4):1207-1240.
[17] Liu Y C,Wang A D,Li S G,et al. Composition and geochronology of the deep-seated xenoliths from the southeastern margin of the North China Craton[J]. Gondwana Res,2013,23(3):1021-1039.
[18]王娟,盛勇,卜香萍,等.五河杂岩的变质岩石学及P-T条件分析:来自蒙城南ZK02钻孔的研究[J].地质科学,2014(2):556-575.
[19]聂峰,石永红,张忠宝,等.安徽北部郯庐断裂两侧基底岩石年龄及对郯庐断裂初始开启时间的限定[J].科学通报,2015,60(24):2315-2326.
[20]安徽省地质矿产勘查局.安徽省区域地质志[M].北京:地质出版社,1987:262-468.
[21]冉崇珍,涂荫玖.五河地区紫苏麻粒岩岩石学特征初探[J].安徽地质,1993,3(3):26-28.
[22]刘国生,宋传中,王道轩,等.郯庐断裂(K2-E)的伸展活动及其对合肥盆地的控制[J].合肥工业大学学报(自然科学版),2002,25(5):672-677.
[23]戴绪丁.火试金富集—电感耦合等离子体质谱法测定地质样品中痕量铂、钯、金[J].江西科学,2013,31(6):734-736.
[24]魏轶,窦向丽,巨力佩,等.四酸溶解—电感耦合等离子体发射光谱法测定金锑矿和锑矿石中的锑[J].岩矿测试,2013,32(5):715-718.
[25]孔芹.熔融法x射线荧光光谱测定岩石主成分含量[J].化学分析计量,2012,21(2):49-51.
[26]刘昌实,牟惟熹,辛克礼.岩石化学与多元统计[M].北京:地质出版社,1987:20-33.
[27]王嘉荫.应力矿物[M].北京:地质出版社,1978:10-45.
[28]王小风,李中坚,陈柏林,等.郯庐断裂带[M].北京:地质出版社,2000:269-321.
[29]刘英俊,曹励明.元素地球化学导论[M].北京:地质出版社,1985:22-85.
[30]韩吟文,马振东,张宏飞,等.地球化学[M].北京:地质出版社,2002:45-89.