高精度磁法在黑龙江712斑岩型钼矿床勘查评价中的应用
|
摘要
随着找矿难度的增加,地球物理方法是实现覆盖区找矿的重要手段。黑龙江省712斑岩型钼矿床地表植被发育,无基岩露头,找矿难度较大。斑岩型矿床具高成矿温度、大规模蚀变特点,蚀变区受热液活动影响可产生明显退磁。为快速圈定712钼矿床矿化蚀变中心,野外采用高精度磁法开展扫面测量。测量结果表明研究区相对正、负磁异常分布结构清晰,中心地区以负磁为主,四周以正磁为主,负磁异常总体呈NE向展布。根据磁异常布设的19个钻孔查证结果表明,赋矿二长花岗岩普遍具硅化、绢云母化、绿泥石化,各孔多见累计厚度大于100 m钼矿体。
With the difficulty of mineral exploration is increasing,the important function of geophysical exploration is gradually revealed,especially in the covered area. The surface of 712 porphyritic molybdenum deposit in Heilongjiang Province is covered with heavily vegetation.Besides,no bedrock outcrops make it more difficult to conduct amineral exploration activities over there. The porphyry deposits are characterized by high metallogenic temperature and large-scale alteration. The alteration zone is obviously demagnetized because of the hydrothermal activities. To delimit the mineralization and alteration targets with high efficiency,the high precision magnetic surveying is carried out over 712 molybdenum property. The magnetic data show that the distribution structure of the positive and negative magnetic anomalies is clear,and the central area is covered broadly by negative magnetic anomalies,the most of surrounding areas are positive magnetic anomalies,and the strike of negative magnetic anomalies is NW-trending. The results of 19 boreholes arranged according tomagnetic anomalies show that the ore-bearing monzonitic granite is generally metamorphosed by silicification,sericitization and chloritization.More than 100 meters cumulated thickness of molybdenum ore body has been intersected in the boreholes.
With the difficulty of mineral exploration is increasing,the important function of geophysical exploration is gradually revealed,especially in the covered area. The surface of 712 porphyritic molybdenum deposit in Heilongjiang Province is covered with heavily vegetation.Besides,no bedrock outcrops make it more difficult to conduct amineral exploration activities over there. The porphyry deposits are characterized by high metallogenic temperature and large-scale alteration. The alteration zone is obviously demagnetized because of the hydrothermal activities. To delimit the mineralization and alteration targets with high efficiency,the high precision magnetic surveying is carried out over 712 molybdenum property. The magnetic data show that the distribution structure of the positive and negative magnetic anomalies is clear,and the central area is covered broadly by negative magnetic anomalies,the most of surrounding areas are positive magnetic anomalies,and the strike of negative magnetic anomalies is NW-trending. The results of 19 boreholes arranged according tomagnetic anomalies show that the ore-bearing monzonitic granite is generally metamorphosed by silicification,sericitization and chloritization.More than 100 meters cumulated thickness of molybdenum ore body has been intersected in the boreholes.
引文
程国华,王瑞良,曾庆栋,等.2015.黑龙江鹿鸣钼矿区花岗质杂岩锆石U-Pb年龄、Hf同位素、辉钼矿Re-Os年龄及其地质意义[J].岩石学报,31(8):2450-2464.
邓澍令,杨献德,黄勤,等.1987.大黑山斑岩型钼矿床地球物理场特征[J].吉林地质,(2):20-33.
管志宁.1997.我国磁法勘探的研究与进展[J].地球物理学报,40(增刊):299-307.
金露英,秦克章,李光明,等.2015.大兴安岭北段岔路口斑岩Mo-热液脉状Zn-Pb成矿系统硫化物微量元素的分布、起源及其勘探指示[J].岩石学报,31(8):2417-2434.
刘翠,邓晋福,罗照华,等.2014.岩基后成矿作用:来自小兴安岭鹿鸣超大型钼矿的证据[J].岩石学报,30(11):3400-3418.
刘家远,单娜琳,钱建平,等.2006.隐伏矿床预测的理论和方法[M].北京:冶金工业出版社,47-59.
刘建明,张锐,张庆洲.2004.大兴安岭地区的区域成矿特征[J].地学前缘,11(3):269-277.
刘士毅,张明华.1998.中国金属矿地球物理勘查[J].地学前缘,5(1-2):201-207.
牛海威,李名松,汪冰,等.2016.综合物化探方法在铁及多金属矿勘查中的应用——以包恩亨地区为例[J].矿产与地质,30(5):828-832.
王琳琳,孙丰月,徐九华,等.2015.黑龙江鹿鸣钼矿床成矿流体及演化[J].岩石学报,31(4):979-990.
杨根生,印修章,付治国.2006.东沟特大型斑岩钼矿床物化探综合找矿信息研究[J].地质找矿论丛,21(2):137-141.
杨言辰,韩世炯,孙德有,等.2012.小兴安岭—张广才岭成矿带斑岩型钼矿床岩石地球化学特征及其年代学研究[J].岩石学报,28(2):379-390.
袁国平,张磊,张玉雪,等.2015.磁法在辽宁查马屯铁矿发现中的作用及意义[J].矿产与地质,29(4):527-530.
张伟庆,张作伦,张鲁新,等.2009.高精度磁法在某铅锌矿体勘查中的应用[J].金属矿山,39(4):394-396.
张作伦,刘建明,褚少雄.2012.内蒙古西拉沐伦成矿带羊场石英脉型钼矿床成矿流体地球化学特征研究[J].岩石学报,28(2):391-400.
张作伦,刘建明,曾庆栋.2011.内蒙古碾子沟钼矿床SHRIMP锆石UPb年龄、硫同位素组成及其地质意义[J].矿床地质,30(6):1122-1128.
张作伦,曾庆栋,于昌明,等.2014.综合地球物理方法在找矿靶区快速评价中的应用[J].矿物岩石地球化学通报,33(5):747-752.
周伶俐,曾庆栋,刘建明,等.2010.吉林大黑山斑岩型钼矿床成矿阶段及含矿裂隙分布规律[J].地质与勘探,46(3):448-454.
邓澍令,杨献德,黄勤,等.1987.大黑山斑岩型钼矿床地球物理场特征[J].吉林地质,(2):20-33.
管志宁.1997.我国磁法勘探的研究与进展[J].地球物理学报,40(增刊):299-307.
金露英,秦克章,李光明,等.2015.大兴安岭北段岔路口斑岩Mo-热液脉状Zn-Pb成矿系统硫化物微量元素的分布、起源及其勘探指示[J].岩石学报,31(8):2417-2434.
刘翠,邓晋福,罗照华,等.2014.岩基后成矿作用:来自小兴安岭鹿鸣超大型钼矿的证据[J].岩石学报,30(11):3400-3418.
刘家远,单娜琳,钱建平,等.2006.隐伏矿床预测的理论和方法[M].北京:冶金工业出版社,47-59.
刘建明,张锐,张庆洲.2004.大兴安岭地区的区域成矿特征[J].地学前缘,11(3):269-277.
刘士毅,张明华.1998.中国金属矿地球物理勘查[J].地学前缘,5(1-2):201-207.
牛海威,李名松,汪冰,等.2016.综合物化探方法在铁及多金属矿勘查中的应用——以包恩亨地区为例[J].矿产与地质,30(5):828-832.
王琳琳,孙丰月,徐九华,等.2015.黑龙江鹿鸣钼矿床成矿流体及演化[J].岩石学报,31(4):979-990.
杨根生,印修章,付治国.2006.东沟特大型斑岩钼矿床物化探综合找矿信息研究[J].地质找矿论丛,21(2):137-141.
杨言辰,韩世炯,孙德有,等.2012.小兴安岭—张广才岭成矿带斑岩型钼矿床岩石地球化学特征及其年代学研究[J].岩石学报,28(2):379-390.
袁国平,张磊,张玉雪,等.2015.磁法在辽宁查马屯铁矿发现中的作用及意义[J].矿产与地质,29(4):527-530.
张伟庆,张作伦,张鲁新,等.2009.高精度磁法在某铅锌矿体勘查中的应用[J].金属矿山,39(4):394-396.
张作伦,刘建明,褚少雄.2012.内蒙古西拉沐伦成矿带羊场石英脉型钼矿床成矿流体地球化学特征研究[J].岩石学报,28(2):391-400.
张作伦,刘建明,曾庆栋.2011.内蒙古碾子沟钼矿床SHRIMP锆石UPb年龄、硫同位素组成及其地质意义[J].矿床地质,30(6):1122-1128.
张作伦,曾庆栋,于昌明,等.2014.综合地球物理方法在找矿靶区快速评价中的应用[J].矿物岩石地球化学通报,33(5):747-752.
周伶俐,曾庆栋,刘建明,等.2010.吉林大黑山斑岩型钼矿床成矿阶段及含矿裂隙分布规律[J].地质与勘探,46(3):448-454.