老挝南部帕莱通(PhLayThong)铁矿磁异常特征及找矿评价
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摘要
勘查区位于老挝南部占巴色省帕同鹏县,帕莱通铁矿由流纹岩-玄武岩组成的双峰式火山岩组合,底部为流纹岩,上部为玄武岩,铁矿体出露地表,直接覆盖在玄武岩之上.由于老挝热带雨林气候植被茂密,部分地区覆盖严重,加上矿体及地层产状近似水平,且矿体层中见大型致密块状玄武岩角砾,杂堆于矿体中,难于分辨,导致地表地质填图对矿体及玄武岩界线不好厘定,为了准确划分地质界线、圈定矿体规模及储量分析,我们在该区开展了1∶25000地面高精度磁法测量,控制了玄武岩及赤铁矿体的范围、延伸、规模,后期勘探阶段开展2.5D磁异常人机交互正反演控制矿体深部延展情况.结果表明,在老挝南部地质勘查程度低、覆盖严重的帕莱通地区开展高精度磁法是控制该地区赤铁矿及玄武岩分布的有效地球物理方法.
The exploration area is located in Champasak province,the south Laos,The PhLayThong iron deposit is consist of bimodal volcanic rock association of rhyolitic and basalt,The bottom is rhyolite,and the upper part is basalt,the iron ore body outcrops to the surface,directly covered with basalt. Because of the tropical rain forests and dense vegetation in laos, some areas are seriously covered,and attitude of stratum and ore body are nearly horizontal,moreover,there ara some large dense and massive basalt breccia in the ore body,difficult to distinguish,it is difficult to determine the boundary between ore bodies and basalt by surface geological mapping,the size and reserves of ore bodies are not well calculated.Therefor,we have adopted the 1 ∶25000 high precision magnetic method to understand the scope,extension and scale of basalt and hematite ore bodies,In the later stage of exploration,2. 5 D interactive positive inversion work is carried out to understand the deep extension of the orebody. The results show that high precision magnetic scanning work was a effective method to control the area of hematite and basalt distribution of low degree of geological exploration in southern Laos.
The exploration area is located in Champasak province,the south Laos,The PhLayThong iron deposit is consist of bimodal volcanic rock association of rhyolitic and basalt,The bottom is rhyolite,and the upper part is basalt,the iron ore body outcrops to the surface,directly covered with basalt. Because of the tropical rain forests and dense vegetation in laos, some areas are seriously covered,and attitude of stratum and ore body are nearly horizontal,moreover,there ara some large dense and massive basalt breccia in the ore body,difficult to distinguish,it is difficult to determine the boundary between ore bodies and basalt by surface geological mapping,the size and reserves of ore bodies are not well calculated.Therefor,we have adopted the 1 ∶25000 high precision magnetic method to understand the scope,extension and scale of basalt and hematite ore bodies,In the later stage of exploration,2. 5 D interactive positive inversion work is carried out to understand the deep extension of the orebody. The results show that high precision magnetic scanning work was a effective method to control the area of hematite and basalt distribution of low degree of geological exploration in southern Laos.
引文
Chen H,Deng J Z,Lu Q T,et al.2015.Three-dimension inversion of gravity and magnetic data at Jiujiang-Ruichang distrct and metallogenic indication[J].Chinese Journal of Geophysics,58(12):4778-4489,doi:10.6038/cjg20151212.
Chen Y Q,Huang J N,Lu Y X,et al.2009.Geochemistry of Elements,Sulphur-Lead Isotopes and Fluid Inclusions from Jinla Pb-Zn-Ag Poly-Metallic Ore Field at the Joint Area across China and Myanmar Border[J].Earth Science-Journal of China University of Geosciences(in Chinese),34(4):585-594.
Chen Z L,Zuo Q H,Wang J F.2013.Magnetic prospecting on magnet mining exploration area of Laos bokeo province[J].Progress in Geophys(in Chinese),28(3):1447-1452,doi:10.6038/pg20130339.
Deng Y H,Huang F.2007.High magnetic hill in Chuzhou concealedrock ecliptic application[J].Mine(in Chinese with English abstract),(05):78-79.
Fu Q H,Li L T,Kuang Q G,Zhao Z X.2008.Gravity and magnetic abnormity and resource potential prediction in the JinShanDian Fe mine,eastern HuBei province[J].Geology and Prospecting(in Chinese with English abstract),44(3):60-64.
Guo Z H,Zhang B L,Qi M,et al.2011.The application of high precision ground magnetic prospecting for geological mapping in the 13451mining area in Mongolia[J].Progress in Geophysics(in Chinese),26(5):1802-1811,doi:10.3969/j.issn.1004-2903.2011.05.036.
LI S P,MA H Z,CHEN Y S,et al.2010.Geochemistry and genesis of trace elements from potash deposit in Vientiane basin,Laos[J].Geological Bulletin of China(in Chinese),29(5):760-770.
Liu J X,Hu H J,Liu C M,Han S L,Xie W.2006.Application of synthetical geophysical method on exploration of deep-seated resource[J].Geology and Prospecting(in Chinese),42(4):71-74.
Liu S B,Chen C,Hu Z W.The application and characteristic of vertical first-order derivative of the total magnitude magnetic anomaly[J].Progress in Geophysics(in Chinese),26(2):647-653,doi:10.3969/j.issn.1004-2903.2011.02.033.
Lou D B,Song G X,Li N,et al.2008.The application of magnetic method in national mineral prediction[J].Progress in Geophysics(in Chinese),23(1):249-256.
Lu Y X,Liu H G,Huang J N,et al.2009.Preliminary division of the metallogenetic belts in the Central South Peninsula of Southeast Asia and their regional ore-forming characteristics[J].Geological Bulletin of China(in Chinese),28(2/3):314-325.
Meng X H,Liu G F,Chen Z X,et al.2012.3D gravity and magnetic inversion for physical properties based on residual anomaly correlation[J].Chinese J.Geophys(in Chinese),55(1):304-309doi:10.6038/j.issn.0001-5733.2012.01.030.
Shen F L,Gong Y L.2008.Ground magnetic survey in eighthigh-precision River iron ore prospecting application[J].Nanhua University(Natural Science)(in Chinese with English abstract),(1)44-47.
Shi M F,Lin F C,Liu C J,et al.2013.Classification and metallogenesis of metallogenic belts in Southest Asia and the neighbouring southwestern part of China[J].Sedimentary Geology and Tethyan Geology(in Chinese),33(2):103-111.
Sun Y,Liu J M,et al.2010.Application of comprehensive geophysical methods in ore prospecting in one Au polymetallic mineralizing area[J].Progress in Geophysics(in Chinese),25(6):131-137,doi:10.3969/j.issn.1004-2903.2010.06.028.
Tian W F,Hao J J,Yan J Y,et al.2010.Application of synthetic geophysical methods to deep exploration of Hanxing-type iron deposit[J].Progress in Geophysics(in Chinese),25(4):1442-1452,doi:10.3969/j.issn.1004-2903.2010.04.036.
Xiong G C.1964.The Interpretation and Inference Based on Magnetic Anomaly in Magnetic Deposit[M].Beijing:China Industry Press(in chinese).
XUE D J,Jiang M,Wu L S,et al.2006.East-west division of regional gravity and magnetic anomalies on the Qinghai-Tibet Plateau and its tectonic features[J].Geology in China(in Chinese),33(4):912-919.
Zeng Q Q.Liu T Y.2011.EMD of gravity and magnetic anomalies and its application for iron deposit exploration in Zhangfushan,Eastern Hubei[J].Progress in Geophys(in Chinese),26(4):1409-1414,doi:10.3969/j.issn.1004-2903.2011.04.036.
Zhang H L,Hu X Y,Liu T Y.2012.Fast inversion of magnetic source boundary and top depth via second order derivative[J].Chinese J.Geophys(in Chinese),55(11):3839-3847,doi:10.6038/j.issn.0001-5733.2012.11.031.
Zhu H P,Fan W Y,Mao H J,et al.2014.Geological characteristics and metallogenesis of the PHa Lek iron deposit in vientiane province,Laos[J].Journal of Jilin University:Earth Science Edition(in Chinese),44(5):1492-1501.
陈辉,邓居智,吕庆田,等.2015.九瑞矿集区重磁三维约束反演及深部找矿意义[J].地球物理学报,58(12):4478-4489,doi:10.6038/cjg20151212.
陈永清,黄静宁,卢映祥,等.2009.中缅毗邻区金腊Pb-Zn-Ag多金属矿田元素、稳定同位素和流体包裹体地球化学[J].地球科学-中国地质大学学报,34(4):585-594.
陈载林,左琼华,王建飞.2013.老挝波乔省某磁铁矿区磁法勘探[J].地球物理学进展,28(3):1447-1452,doi:10.6038/pg20130339.
邓月红,黄甫.2007.高精度磁法在滁州黄道山隐伏岩体的应用[J].矿业快报,(05):78-79.
傅群和,李朗田,匡清国,等.2008.鄂东地区金山店铁矿重磁异常特征及资源潜力预测[J].地质与勘探,44(3):60-64.
郭志华,张宝林,祁民,等.2011.地面高精度磁测在蒙古13451矿区地质填图中的应用[J].地球物理学进展,26(5):1802-1811,doi:10.3969/j.issn.1004-2903.2011.05.036.
李善平,马海洲,陈有顺,等.2010.老挝万象盆地钾盐矿床微量元素地球化学特征及矿床的成因[J].地质通报,29(5):760-770.
柳建新,胡厚继,刘春明,等.2006.综合物探方法在深部接替资源勘探中的应用[J].地质与勘探,42(4):71-74.
刘圣博,陈超,胡正旺.2011.磁异常模量垂向一阶导数的特征及应用.地球物理学进展[J].26(2):647-653,doi:10.3969/j.issn.1004-2903.2011.02.033.
娄德波,宋国玺,李楠,等.2008.磁法在我国矿产预测中的应用.地球物理学进展[J].23(1):249-256.
卢映祥,刘洪光,黄静宁,等.2009.东南亚中南半岛成矿带初步划分与区域成矿特征[J]..地质通报,28(2/3):314-325.
孟小红,刘国峰,陈召曦,等.2012.基于剩余异常相关成像的重磁物性反演方法[J].地球物理学报,55(1):304-309,doi:10.6038/j.issn.0001-5733.2012.01.030.
沈方铝,龚育龄.2008.地面高精度磁测在八河铁矿区找矿中的应用[J].南华大学学报(自然科学版),(01):44-47.
施美凤,林方成,刘朝基,等.2014.东南亚缅泰老越柬五国与中国邻区成矿带划分及成矿特征[J].沉积与特提斯地质,33(2):103-111.
孙燕,刘建明,曾庆栋,等.2010.综合地球物理方法在某金多金属矿区找矿中的应用[J].地球物理学进展,25(6):131-137,doi:10.3969/j.issn.1004-2903.2010.06.028.
田文法,郝俊杰,严加永,等.2010.综合地球物理方法在邯邢式铁矿深部找矿中的应用[J].地球物理学进展,25(4):1442-1452,doi:10.3969/j.issn.1004-2903.2010.04.036.
熊光楚.1964.磁铁矿床上磁异常的解释推断[M].北京:中国工业出版社.
薛典军,姜枚,吴良士,等.2006.青藏高原区域重磁异常的东西向分区及其构造地质特征[J].中国地质,33(4):912-919.
曾琴琴,刘天佑.2011.重、磁异常的经验模态分解及其在鄂东张福山铁矿勘探中的应用[J].地球物理学进展,26(4):1409-1414,doi:10.3969/j.issn.1004-2903.2011.04.036.
张恒磊,胡祥云,刘天佑.2012.基于二阶导数的磁源边界与顶部深度快速反演[J].地球物理学报,55(11):3839-3847,doi:10.6038/j.issn.0001-5733.2012.11.031.
朱华平,范文玉,毛洪江,等.2014.老挝万象省爬立山铁矿床地质特征及成矿作用分析[J].吉林大学学报:地球科学版,44(5):1492-1501.
Chen Y Q,Huang J N,Lu Y X,et al.2009.Geochemistry of Elements,Sulphur-Lead Isotopes and Fluid Inclusions from Jinla Pb-Zn-Ag Poly-Metallic Ore Field at the Joint Area across China and Myanmar Border[J].Earth Science-Journal of China University of Geosciences(in Chinese),34(4):585-594.
Chen Z L,Zuo Q H,Wang J F.2013.Magnetic prospecting on magnet mining exploration area of Laos bokeo province[J].Progress in Geophys(in Chinese),28(3):1447-1452,doi:10.6038/pg20130339.
Deng Y H,Huang F.2007.High magnetic hill in Chuzhou concealedrock ecliptic application[J].Mine(in Chinese with English abstract),(05):78-79.
Fu Q H,Li L T,Kuang Q G,Zhao Z X.2008.Gravity and magnetic abnormity and resource potential prediction in the JinShanDian Fe mine,eastern HuBei province[J].Geology and Prospecting(in Chinese with English abstract),44(3):60-64.
Guo Z H,Zhang B L,Qi M,et al.2011.The application of high precision ground magnetic prospecting for geological mapping in the 13451mining area in Mongolia[J].Progress in Geophysics(in Chinese),26(5):1802-1811,doi:10.3969/j.issn.1004-2903.2011.05.036.
LI S P,MA H Z,CHEN Y S,et al.2010.Geochemistry and genesis of trace elements from potash deposit in Vientiane basin,Laos[J].Geological Bulletin of China(in Chinese),29(5):760-770.
Liu J X,Hu H J,Liu C M,Han S L,Xie W.2006.Application of synthetical geophysical method on exploration of deep-seated resource[J].Geology and Prospecting(in Chinese),42(4):71-74.
Liu S B,Chen C,Hu Z W.The application and characteristic of vertical first-order derivative of the total magnitude magnetic anomaly[J].Progress in Geophysics(in Chinese),26(2):647-653,doi:10.3969/j.issn.1004-2903.2011.02.033.
Lou D B,Song G X,Li N,et al.2008.The application of magnetic method in national mineral prediction[J].Progress in Geophysics(in Chinese),23(1):249-256.
Lu Y X,Liu H G,Huang J N,et al.2009.Preliminary division of the metallogenetic belts in the Central South Peninsula of Southeast Asia and their regional ore-forming characteristics[J].Geological Bulletin of China(in Chinese),28(2/3):314-325.
Meng X H,Liu G F,Chen Z X,et al.2012.3D gravity and magnetic inversion for physical properties based on residual anomaly correlation[J].Chinese J.Geophys(in Chinese),55(1):304-309doi:10.6038/j.issn.0001-5733.2012.01.030.
Shen F L,Gong Y L.2008.Ground magnetic survey in eighthigh-precision River iron ore prospecting application[J].Nanhua University(Natural Science)(in Chinese with English abstract),(1)44-47.
Shi M F,Lin F C,Liu C J,et al.2013.Classification and metallogenesis of metallogenic belts in Southest Asia and the neighbouring southwestern part of China[J].Sedimentary Geology and Tethyan Geology(in Chinese),33(2):103-111.
Sun Y,Liu J M,et al.2010.Application of comprehensive geophysical methods in ore prospecting in one Au polymetallic mineralizing area[J].Progress in Geophysics(in Chinese),25(6):131-137,doi:10.3969/j.issn.1004-2903.2010.06.028.
Tian W F,Hao J J,Yan J Y,et al.2010.Application of synthetic geophysical methods to deep exploration of Hanxing-type iron deposit[J].Progress in Geophysics(in Chinese),25(4):1442-1452,doi:10.3969/j.issn.1004-2903.2010.04.036.
Xiong G C.1964.The Interpretation and Inference Based on Magnetic Anomaly in Magnetic Deposit[M].Beijing:China Industry Press(in chinese).
XUE D J,Jiang M,Wu L S,et al.2006.East-west division of regional gravity and magnetic anomalies on the Qinghai-Tibet Plateau and its tectonic features[J].Geology in China(in Chinese),33(4):912-919.
Zeng Q Q.Liu T Y.2011.EMD of gravity and magnetic anomalies and its application for iron deposit exploration in Zhangfushan,Eastern Hubei[J].Progress in Geophys(in Chinese),26(4):1409-1414,doi:10.3969/j.issn.1004-2903.2011.04.036.
Zhang H L,Hu X Y,Liu T Y.2012.Fast inversion of magnetic source boundary and top depth via second order derivative[J].Chinese J.Geophys(in Chinese),55(11):3839-3847,doi:10.6038/j.issn.0001-5733.2012.11.031.
Zhu H P,Fan W Y,Mao H J,et al.2014.Geological characteristics and metallogenesis of the PHa Lek iron deposit in vientiane province,Laos[J].Journal of Jilin University:Earth Science Edition(in Chinese),44(5):1492-1501.
陈辉,邓居智,吕庆田,等.2015.九瑞矿集区重磁三维约束反演及深部找矿意义[J].地球物理学报,58(12):4478-4489,doi:10.6038/cjg20151212.
陈永清,黄静宁,卢映祥,等.2009.中缅毗邻区金腊Pb-Zn-Ag多金属矿田元素、稳定同位素和流体包裹体地球化学[J].地球科学-中国地质大学学报,34(4):585-594.
陈载林,左琼华,王建飞.2013.老挝波乔省某磁铁矿区磁法勘探[J].地球物理学进展,28(3):1447-1452,doi:10.6038/pg20130339.
邓月红,黄甫.2007.高精度磁法在滁州黄道山隐伏岩体的应用[J].矿业快报,(05):78-79.
傅群和,李朗田,匡清国,等.2008.鄂东地区金山店铁矿重磁异常特征及资源潜力预测[J].地质与勘探,44(3):60-64.
郭志华,张宝林,祁民,等.2011.地面高精度磁测在蒙古13451矿区地质填图中的应用[J].地球物理学进展,26(5):1802-1811,doi:10.3969/j.issn.1004-2903.2011.05.036.
李善平,马海洲,陈有顺,等.2010.老挝万象盆地钾盐矿床微量元素地球化学特征及矿床的成因[J].地质通报,29(5):760-770.
柳建新,胡厚继,刘春明,等.2006.综合物探方法在深部接替资源勘探中的应用[J].地质与勘探,42(4):71-74.
刘圣博,陈超,胡正旺.2011.磁异常模量垂向一阶导数的特征及应用.地球物理学进展[J].26(2):647-653,doi:10.3969/j.issn.1004-2903.2011.02.033.
娄德波,宋国玺,李楠,等.2008.磁法在我国矿产预测中的应用.地球物理学进展[J].23(1):249-256.
卢映祥,刘洪光,黄静宁,等.2009.东南亚中南半岛成矿带初步划分与区域成矿特征[J]..地质通报,28(2/3):314-325.
孟小红,刘国峰,陈召曦,等.2012.基于剩余异常相关成像的重磁物性反演方法[J].地球物理学报,55(1):304-309,doi:10.6038/j.issn.0001-5733.2012.01.030.
沈方铝,龚育龄.2008.地面高精度磁测在八河铁矿区找矿中的应用[J].南华大学学报(自然科学版),(01):44-47.
施美凤,林方成,刘朝基,等.2014.东南亚缅泰老越柬五国与中国邻区成矿带划分及成矿特征[J].沉积与特提斯地质,33(2):103-111.
孙燕,刘建明,曾庆栋,等.2010.综合地球物理方法在某金多金属矿区找矿中的应用[J].地球物理学进展,25(6):131-137,doi:10.3969/j.issn.1004-2903.2010.06.028.
田文法,郝俊杰,严加永,等.2010.综合地球物理方法在邯邢式铁矿深部找矿中的应用[J].地球物理学进展,25(4):1442-1452,doi:10.3969/j.issn.1004-2903.2010.04.036.
熊光楚.1964.磁铁矿床上磁异常的解释推断[M].北京:中国工业出版社.
薛典军,姜枚,吴良士,等.2006.青藏高原区域重磁异常的东西向分区及其构造地质特征[J].中国地质,33(4):912-919.
曾琴琴,刘天佑.2011.重、磁异常的经验模态分解及其在鄂东张福山铁矿勘探中的应用[J].地球物理学进展,26(4):1409-1414,doi:10.3969/j.issn.1004-2903.2011.04.036.
张恒磊,胡祥云,刘天佑.2012.基于二阶导数的磁源边界与顶部深度快速反演[J].地球物理学报,55(11):3839-3847,doi:10.6038/j.issn.0001-5733.2012.11.031.
朱华平,范文玉,毛洪江,等.2014.老挝万象省爬立山铁矿床地质特征及成矿作用分析[J].吉林大学学报:地球科学版,44(5):1492-1501.