摘要
昆仑-阿尔金成矿带西段具备寻找岩浆型铜镍硫化物矿床的有利地质条件,但地形条件复杂、覆盖层发育,传统地质调查难以有效圈定隐伏矿体,制约了找矿突破。为查明控矿岩体分布及硫化物矿化空间,在阿克陶县克拉克尔地区开展了以高精度磁法和激发极化法为主的综合物探勘查。采用1∶5000高精度磁测圈定基性-超基性岩体范围,同步布设激电中梯剖面和测深点探测硫化物富集部位,并结合岩矿石物性测定结果进行异常解译。物探结果显示,测区西部发现一处近东西向展布的高磁异常区,ΔT值介于-392~+593nT之间,规模约500m×600m,地表对应基性岩体露头;激电中梯剖面在P10、P20、P30线上均揭示出高视极化率异常,峰值大于5%,最高达9.8%,与高磁异常空间上高度重叠。物性测定表明,含矿辉石岩和褐铁矿化岩石极化率平均值分别为3.8%和4.12%,显著高于围岩,为异常解释提供了直接依据。综合研究表明,高磁与高极化异常重叠区是寻找铜镍硫化物矿床的有利靶区,其中P20线50~200号点、P30线80~150号点等区段兼具“高磁-高极化-低阻”组合特征,成矿潜力较大。研究结果为该区下一步深部工程验证提供了明确方向,所建立的“磁法圈岩体、激电找矿化”综合勘查模式对类似地质背景区的铜镍矿勘查具有参考价值。
The western Kunlun-Altun metallogenic belt hosts favorable geological conditions for magmatic Cu-Ni sulfide deposits.Nevertheless,complex topography and extensive surficial cover have constrained conventional geological surveys in effectively delineating concealed ore bodies,thereby limiting exploration success.To ascertain the distribution of ore-controlling mafic-ultramafic intrusions and associated sulfide mineralization,an integrated geophysical investigation was undertaken in the Kelakeer area of Akto County,Xinjiang,employing high-precision magnetic surveying and induced polarization(IP)methods.A 1:5,000-scale high-precision magnetic survey was conducted to delineate intrusion boundaries,while dipole-dipole IP gradient arrays and vertical electrical soundings were deployed concurrently to identify zones of sulfide enrichment,with interpretation constrained by petrophysical measurements.The geophysical survey revealed an approximately east-west-trending high-amplitude magnetic anomaly in the western study area,characterized by total field(ΔT')values ranging from-392 nT to+593 nT and dimensions of approximately 500 m×600 m,coincident with surface exposures of mafic lithologies.IP gradient profiles along lines P10,P20,and P30 exhibited high apparent chargeability anomalies,with peak values exceeding 5%and maxima reaching 9.8%,demonstrating strong spatial correlation with the magnetic high.Petrophysical analysis indicated that ore-bearing pyroxenite and limonitized rocks yielded mean chargeability values of 3.8%and 4.12%,respectively——significantly elevated relative to host rocks—thus furnishing direct evidence for anomaly interpretation.Integrated analysis indicates that areas with coincident high magnetic and high chargeability anomalies constitute favorable exploration targets for Cu-Ni sulfide mineralization.Notably,segments along line P20(stations 50-200)and line P30(stations 80-150)exhibit diagnostic'high magnetism-high chargeability-low resistivity'signatures,suggesting significant mineralization potential.These results provide definitive targets for subsequent deep drilling programs and establish an integrated exploration protocol—'magnetic delineation of intrusions,IP targeting of mineralization'—that is transferable to analogous geological settings regionally.
作者
张文杰
冀新臣
杨申勇
刘牧星
张旭东
ZHANG Wenjie;JI Xinchen;YANG Shenyong;LIU Muxing;ZHANG Xudong(China Non-ferrous Metals Resource Geological Survey,Beijing 100012)
出处
《中国锰业》
2025年第5期50-56,63,共8页
China Manganese Industry
关键词
新疆阿克陶
铜镍矿
高精度磁法
激发极化法
综合物探
Akto,Xinjiang
Cu-Ni deposit
high-precision magnetic survey
induced polarization
integrated geophysics
