华北地台北界划分新证据及其找矿意义
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摘要
通过对华北地台北缘翁牛特旗大朝阳沟地区2014年获得的1∶1万高精度时间域航空电磁、航磁资料的分析,重新厘定了华北地台北界的位置及产状,总结了不同矿种的航空电、磁特征。华北地台北界沿西南沟-小朝阳沟-上东三家一线呈向北凸出的弧形展布,界面总体外倾、倾角50°～70°,呈扭动弯曲的曲面向下延伸。相比于多金属矿和铅锌矿,金矿、铜金矿、铜金银矿等航空感应激发极化(AIIP)效应较强且与线性磁异常套合,具有明显的航空电、磁特征。据此,结合化探资料,圈定了金及多金属找矿靶区3片,对其中的2片利用Cole-Cole模型设计了建议钻孔2个。
A helicopter-borne VTEM time-domain airborne electromagnetic and magnetic survey with scale 1∶10 000 was flown over the Dachaoyanggou area which is located in the south of Wengniute County, north margin of North China Platform. Geophysical signature characteristics of different tectonic units and mineralization were observed in the electromagnetic and magnetic data. The boundary was redefined, which extends along the line from east to west, displaying as a north protruding arc in the plane, and its interface overall leans outward with angle 50 ° to 70 °, showing S shape twisting down. Compared with polymetals and lead-zinc deposit, the characteristics show strong airborne inductively induced polarization(AIIP) over the gold, copper-gold and copper-gold-silver deposit while aeromagnetic is simultaneous linear magnetic anomaly. Integration with geochemistry data helped to identify 3 new potential targets for the following exploration. Two of the targets were designed for the following-up two drills by Cole-Cole model.
A helicopter-borne VTEM time-domain airborne electromagnetic and magnetic survey with scale 1∶10 000 was flown over the Dachaoyanggou area which is located in the south of Wengniute County, north margin of North China Platform. Geophysical signature characteristics of different tectonic units and mineralization were observed in the electromagnetic and magnetic data. The boundary was redefined, which extends along the line from east to west, displaying as a north protruding arc in the plane, and its interface overall leans outward with angle 50 ° to 70 °, showing S shape twisting down. Compared with polymetals and lead-zinc deposit, the characteristics show strong airborne inductively induced polarization(AIIP) over the gold, copper-gold and copper-gold-silver deposit while aeromagnetic is simultaneous linear magnetic anomaly. Integration with geochemistry data helped to identify 3 new potential targets for the following exploration. Two of the targets were designed for the following-up two drills by Cole-Cole model.
引文
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[23] Cole K,Cole R.Dispersion and absorption in dielectrics:Part I.Alternating current characteristics[J].Journal of Chemical Physics,1941,9:341-351.
[2] Zhang Shuanhong,Zhao Yue,Song Biao,et al.Petrogenesis of the middle devonian Gushan diorite pluton on the northern margin of the North China block and its tectonic implications[J].Geological Magazine,2007,144(3):553-568.
[3] 张振法,牛颖智,常忠耀,等.中华地台与兴蒙古生代地槽褶皱区界线的重新厘定[J].物探与化探,2002,26(2):83-90.
[4] Li Yingkang,Gao Rui,Yao Yutao,et al.Crustal velocity structure from the northern margin of the North China Craton to the southern margin of the Siberian Plate[J].Chinese Journal of Geophysics,2014,57(1):48-63
[5] Legault J M,Orta M,Kumar H,et al.ZTEM and VTEM airborne EM survey results over PGM-Cu-Ni targets at East Bull Lake anorthositic complex,Massey,Ontario[C]//SEG Expanded Abstracts,2011,30:629-634.
[6] Bournas N,Abdoul-Wahab D M,Kwan K.Integrating airborne geophysics with landsat TM imagery and geology for assessing the mineral potential of Iullemmeden Basin,Niger[C].SEG Technical Program Expanded,Abstracts.2014:1725-1729.
[7] 殷长春,张博,刘云鹤,等.航空电磁勘查技术发展现状及展望[J].地球物理学报,2015,58(8):2637-2653.
[8] 孙栋华,李怀渊,江民忠,等.时间域航空电磁、航磁在五龙沟金矿整装勘查区中的应用研究[J].地球物理学进展,2017,32(6):2533-2544.
[9] Witherly K,Irvine R.The VTEM airborne electromagnetic system-benchmarking continuous improvement via repeat surveys over time[C]//SEG Expanded Abstracts.2006,25:1273-1277.
[10] 殷长春,任秀艳,刘云鹤,等.航空瞬变电磁法对地下典型目标体的探测能力研究[J].地球物理学报,2015,58(9):3370-3379.
[11] Meju M A.A simple method of transient electromagnetic data analysis[J].Geophysics,1998,63:405-410.
[12] 范正国,黄旭钊,熊盛青,等.磁测资料应用技术要求[M].北京:地质出版社,2010:1-141.
[13] 刘登.大兴安岭中南段翁牛特旗地区构造演化与成矿系列[D].北京:中国矿业大学,2013:29-40.
[14] 聂凤军,张可,刘翼飞,等.华北克拉通北缘及邻区印支期岩浆活动与钼和金成矿作用[J].吉林大学学报:地球科学版,2011,41(6):1651-1666.
[15] 陈志国,辛建伟,郭鹏志,等.华北地台北缘中段金矿控矿因素探讨[J].矿产与地质,2015,29(3):322-327.
[16] Kratzer T,Macnae J C.Induced polarization in airborne EM[J].Geophysics,2012,77:317-327.
[17] Kwan K,Prikhodko A,Legault J M,et al.Airborne inductive induced polarization chargeability mapping of VTEM data[C]//ASEG-PESA.2015.
[18] Morrison H F,Phillips R J,O'brien D P.Quantitative interpretation of transient electromagnetic fields over a layered half space[J].Geophysical Prospecting,1969,17(1):82-101.
[19] H?nig M,Tezkan B.1D and 2D Cole-Cole-inversion of time-domain induced-polarization data[J].Geophysical Prospecting,2007,55(1):117-133.
[20] Ghorbani A,Camerlynck C,Florsch N,et al.Bayesian inference of the Cole-Cole parameters from time-and frequency-domain induced polarization[J].Geophysical Prospecting,2007,55(4):589-605
[21] Okay G,Cosenza P,Ghorbani A,et al.Localization and characterization of cracks in clay-rocks using frequency and time-domain induced polarization[J].Geophysical Prospecting,2012,61(1):134-152.
[22] Sultan S A,Mansour S A,Santos F M,et al.Geophysical exploration for gold and associated minerals,case study:Wadi El Beida area,South Eastern Desert,Egypt[J].Journal of Geophysics and Engineering,2009,6(4):345-356.
[23] Cole K,Cole R.Dispersion and absorption in dielectrics:Part I.Alternating current characteristics[J].Journal of Chemical Physics,1941,9:341-351.