APPLICATION OF LOW-ALTITUDE HIGH-PRECISION MAGNETIC SURVEY FOR IRON DEPOSITS IN UNPROVEN AREAS: A Case Study of Rovieng Cheung Dome in Cambodia
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摘要:
罗文真穹隆构造区属柬埔寨北部暹粒-上丁成矿带，主要矿种为铁.已发现铁矿床主要有表生残坡积矿和原生矿两种形式，矿体呈层状、似层状、囊状、透镜状，矿物组合为赤铁矿-磁铁矿-褐铁矿.已发现主要铁矿床有格高铁矿、石山铁矿、诺东山铁矿.穹隆内大范围未知区与已知矿床具有类似的成矿地质背景.为快速评价未知区内铁成矿背景，利用动力三角翼低空高精度磁测技术，综合地质-遥感信息进行找矿预测，并结合地面磁测进行验证.共圈定12个找矿预测区，其中4个为一级找矿靶区，为下一步的主要工作方向.
Abstract:The Rovieng Cheung dome structure is located in the Siem Reap-Stung Treng metallogenic belt with the main mineral of iron in northern Cambodia. The discovered iron deposits, including Gygoye iron deposit, Rock Mountain iron deposit and Nuodongan iron deposit, mainly consist of supergene residual deluvial ores and primary ores, with orebodies occurred in layered, stratoid, cystic and lenticular forms, and mineral assemblages of hematite-magnetite-limonite. The deposits in large unproven areas within the dome share similar metallogenic geological setting with the known deposits. To rapidly evaluate the iron metallogenic background in the unproven areas, the low-altitude high-precision magnetic survey by trike is conducted on the basis of geological and remote sensing information, combined with the ground magnetic survey for verification. A total of 12 prediction areas are delineated, among which 4 are first-level prospecting targets as the main direction of next step.
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Key words:
- iron deposit /
- low altitude magnetic survey /
- prospecting prediction /
- dome structure /
- Cambodia
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表 1 罗文真穹隆地区各铁矿区地质特征表
Table 1. Geological characteristics of iron orefields in Rovieng Cheung dome area
矿区 地层 构造 侵入岩 矿化特征 格高 石炭系—二叠系杂砂岩、含砾粉砂质泥岩、灰岩 总体构造线走向NW向，另有NE向断裂错段NW向 闪长玢岩、闪长岩、花岗闪长岩 发育表生残坡积矿和原生矿，以原生磁铁矿为主；矿体呈层状、似层状、囊状、透镜状分布，主要位于侵入岩体与上石炭统—二叠系地层的接触带上；矿物组合为赤铁矿－磁铁矿－褐铁矿；蚀变和矿化从岩体—矿体—围岩均具有分带性 石山 石炭系—二叠系杂砂岩、安山岩 总体构造线走向NW向，NE向次之 闪长玢岩、闪长岩、花岗闪长岩 发育表生残坡积矿和原生矿，以表生残坡积矿为主；矿体以露头为中心呈面状分布，与地貌关系密切，呈平卧状、囊状、透镜体状；矿体露头从中心向外为块状磁铁矿（少量赤铁矿、褐铁矿）→小块状夹颗粒状磁铁矿（大量褐铁矿化）→细粒状及颗粒状磁铁矿 诺东山 石炭系—二叠系凝灰岩、安山岩 区内断裂依据走向及先后切割关系分为三组：NW向最早，其次为NE向，EW向最晚 闪长岩、花岗闪长岩、二长花岗岩 见少量残坡积型铁矿化露头；矿体呈透镜体状、囊状 基来 石炭系—二叠系安山岩、千枚岩 总体构造线走向NW向，NE向次之 闪长岩、花岗闪长岩 见少量残坡积型铁矿化露头；矿体呈透镜体状、囊状 
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表 2 罗文真地区岩、矿石磁性参数表
Table 2. Magnetic parameters of rocks and ores
岩石名称 标本数 K/10-6SI 总数 无磁性 有磁性 极大值 极小值 平均值 砾岩（铁质胶结） 7 5 2 32 0 17 砾岩（泥质胶结） 5 5 0 0 0 0 安山岩 3 3 0 0 0 0 安山玢岩 3 3 0 0 0 0 石英岩 3 3 0 0 0 0 灰岩 2 2 0 0 0 0 闪长玢岩 5 0 5 55 30 50 砂岩 3 3 0 0 0 0 花岗（斑）岩 7 3 4 33 0 25 闪长岩 6 2 4 56 0 41 磁铁矿 15 0 15 8756 6521 7789 赤铁矿 6 0 6 1356 165 549
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表 3 靶区磁异常特征及地质验证情况
Table 3. Characteristics of magnetic anomaly and geological verification in target areas
预测靶区 磁异常描述 地质验证情况 A-1 异常范围1200 m × 1800 m，正负异常对称展布，正异常最高值>3000 nT，负异常最低值＜-2000 nT；梯度较大，ΔT曲线跳跃较大；推测磁性体总体走向为65°，倾向SE 断裂构造带从异常东边穿过，经槽探工程验证异常为磁铁矿体引起；磁铁矿脉厚度2.8 m，走向60°，TFe平均品位32%；地表见少量磁铁矿露头，矿体位于在负高异常一侧；推测异常中心和深部存在原生磁铁矿体，可作为下一步钻探施工主要区域 A-2 异常范围800 m × 1200 m，正负异常相互伴生，正异常最高值>1000 nT，负异常最低值＜-2000 nT；梯度变化较缓；推测磁性体走向E-W，倾向SE 断裂构造带从异常中心穿过，经槽探工程验证异常为磁铁矿体引起；矿脉厚度1.5 m，TFe品位38%，在深边部具有良好的找矿前景；围岩以硅化安山岩为主，矿石呈角砾状、细脉状；推测本区的磁异常主要与断裂有关 A-3 异常范围800 m × 1300 m，负异常，分为南北两块，呈近长条状展布，负异常最低值＜-3000 nT；ΔT曲线跳跃较大；推测磁性体近直立，总体走向为70° 为闪长玢岩与上覆安山岩的接触带，由于工作程度较低，仅在地表见数块铁矿转石，没有开展相应的钻探和槽探工程；推断为铁矿体导致的异常 A-4 异常范围1000 m × 1300 m，负异常，最低值＜-3000 nT；呈串珠状展布，磁异常未封闭；推测磁性体走向为80°，倾向SE 异常区域发育有灰岩、大理岩；推测主要为侵入闪长岩引起的异常，异常中心和深部可能存在夕卡岩型磁铁矿体
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[1] 刘群, 张伟, 成伟, 等. 辽宁鞍山-本溪地区深部铁矿发育模式与铁矿远景[J]. 地质与资源, 2013, 22(4): 304-307. doi: 10.3969/j.issn.1671-1947.2013.04.009 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/abstract/abstract8967.shtml
Liu Q, Zhang W, Cheng W, et al. Developing model and prospect of the deep iron deposits in Anshan-Benxi area, Liaoning Province[J]. Geology and Resources, 2013, 22(4): 304-307. doi: 10.3969/j.issn.1671-1947.2013.04.009 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/abstract/abstract8967.shtml
[2] 隋真龙, 张琦, 冯啸宇, 等. 辽宁宽甸县爱林铁矿地质特征及控矿因素分析[J]. 地质与资源, 2020, 29(2): 120-125. doi: 10.3969/j.issn.1671-1947.2020.02.002 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/abstract/abstract10182.shtml
Sui Z L, Zhang Q, Feng X Y, et al. Analysis on the geology and ore- controlling factors of Ailin iron deposit in Liaoning Province[J]. Geology and Resources, 2020, 29(2): 120-125. doi: 10.3969/j.issn.1671-1947.2020.02.002 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/abstract/abstract10182.shtml
[3] 武国忠, 肖光铭, 杨大欢. 广东省铁矿成矿规律研究[J]. 地质与资源, 2019, 28(3): 272-279. doi: 10.3969/j.issn.1671-1947.2019.03.009 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/abstract/abstract8407.shtml
Wu G Z, Xiao G M, Yang D H. Study on the metallogenic regularity of iron deposits in Guangdong Province[J]. Geology and Resources, 2019, 28(3): 272-279. doi: 10.3969/j.issn.1671-1947.2019.03.009 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/abstract/abstract8407.shtml
[4] 乔春贵, 周坚鑫, 刘伟, 等. 新疆塔什库尔干地区铁矿航磁异常特征及找矿潜力[J]. 物探与化探, 2012, 36(3): 350-355. https://www.cnki.com.cn/Article/CJFDTOTAL-WTYH201203006.htm
Qiao C G, Zhou J X, Liu W, et al. Areomagnetic characteristics of iron ore deposits and ore-prospecting potential in Taxkorgen area of Xinjiang[J]. Geophysical and Geochemical Exploration, 2012, 36(3): 350-355. https://www.cnki.com.cn/Article/CJFDTOTAL-WTYH201203006.htm
[5] 白银增, 赵涌涛, 王泽蛟, 等. 辽宁查马屯铁矿三维地质建模及深部预测[J]. 地质与资源, 2019, 28(4): 321-325. doi: 10.3969/j.issn.1671-1947.2019.04.002 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/abstract/abstract8354.shtml
Bai Y Z, Zhao Y T, Wang Z J, et al. 3D geological modeling and deep prospecting prediction in Chamatun iron deposit, Liaoning Province[J]. Geology and Resources, 2019, 28(4): 321-325. doi: 10.3969/j.issn.1671-1947.2019.04.002 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/abstract/abstract8354.shtml
[6] 任雨, 朱谷昌, 张建国, 等. 遥感图像三维可视化在低空磁测飞行辅助设计中的应用[J]. 遥感信息, 2014, 29(3): 78-81. doi: 10.3969/j.issn.1000-3177.2014.03.014
Ren Y, Zhu G C, Zhang J G, et al. Remote sensing image visualization for low-altitude magnetic survey flight aided design[J]. Remote Sensing Information, 2014, 29(3): 78-81. doi: 10.3969/j.issn.1000-3177.2014.03.014
[7] 张亚东, 龚红蕾, 刘俊长, 等. 依据航磁异常寻找中关铁矿的效果[J]. 物探与化探, 2014, 38(4): 629-634.
Zhang Y D, Gong H L, Liu J C, et al. The ore-prospecting effect of aeromagnetic anomalies in the Zhongguan iron deposit, Hebei Province[J]. Geophysical and Geochemical Exploration, 2014, 38(4): 629- 634.
[8] 董杰, 李卫东, 肖金平, 等. 河北省八道河航磁低背景场区铁矿地面磁测勘查实例[J]. 物探与化探, 2010, 34(5): 557-563. https://www.cnki.com.cn/Article/CJFDTOTAL-WTYH201005000.htm
Dong J, Li W D, Xiao J P, et al. Ground iron ore magnetic survey in the Badaohe aeromagnetic low background area of Hebei Province[J]. Geophysical and Geochemical Exploration, 2010, 34(5): 557-563. https://www.cnki.com.cn/Article/CJFDTOTAL-WTYH201005000.htm
[9] 高飞. 运用定量解释方法剖析磁异常——以大板金矿区C6磁异常为例[J]. 地质与资源, 2004, 13(1): 43-46. doi: 10.3969/j.issn.1671-1947.2004.01.009 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/abstract/abstract9629.shtml
Gao F. The application of quantitative interpretation in magnetic anomaly analysis: A case study of the C6 magnetic anomaly in Daban gold field[J]. Geology and Resources, 2004, 13(1): 43-46. doi: 10.3969/j.issn.1671-1947.2004.01.009 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/abstract/abstract9629.shtml
[10] 李世超, 路来君, 刘光胜, 等. 基于航磁解译构造法的哀牢山地区金多金属远景预测[J]. 中国地质, 2009, 36(3): 728-735. doi: 10.3969/j.issn.1000-3657.2009.03.019
Li S C, Lu L J, Liu G S, et al. Perspective prognosis of gold- polymetallic ore deposits in Ailao Mountain areabased on aeromagnetic structural interpretation[J]. Geology in China, 2009, 36(3): 728- 735. doi: 10.3969/j.issn.1000-3657.2009.03.019
[11] 肖振宙. 柬埔寨柏威夏省棕榈山矿区金矿找矿前景分析[J]. 黄金, 2013, 34(7): 19-21. https://www.cnki.com.cn/Article/CJFDTOTAL-HJZZ201307007.htm
Xiao Z Z. Analysis on prospecting direction of Zonglushan gold deposit in Preah Vihear, Cambodia[J]. Gold, 2013, 34(7): 19-21. https://www.cnki.com.cn/Article/CJFDTOTAL-HJZZ201307007.htm
[12] 牛聪聪, 张雪亮, 赵俊宏, 等. 柬埔寨罗文真地区铁矿成矿规律及找矿方法集成[J]. 地质论评, 2016, 62(S1): 173-174.
Niu C C, Zhang X L, Zhao J H, et al. Metallogenic regularity and prospecting methods of Luowenzhen vault iron deposit of Cambodia[J]. Geological Review, 2016, 62(S1): 173-174.
[13] 张雪亮, 牛聪聪, 赵俊宏, 等. 柬埔寨KW铜金矿床地质特征及控矿条件[J]. 矿产与地质, 2014, 28(2): 191-195. doi: 10.3969/j.issn.1001-5663.2014.02.011
Zhang X L, Niu C C, Zhao J H, et al. Geological characteristics and ore controlling conditions of KW copper-gold deposit in Cambodia[J]. Mineral Resources and Geology, 2014, 28(2): 191-195. doi: 10.3969/j.issn.1001-5663.2014.02.011
[14] 邱成贵. 柬埔寨柏威夏罗文德邦铜矿地质特征及找矿标志[J]. 山东国土资源, 2017, 33(6): 18-22. doi: 10.3969/j.issn.1672-6979.2017.06.004
Qiu C G. Geological characteristics and prospecting signs of copper deposit in Roman Tam County of Preah Vihear Province in Cambodia[J]. Shandong Land and Resources, 2017, 33(6): 18-22. doi: 10.3969/j.issn.1672-6979.2017.06.004
[15] 戴开明. 柬埔寨柏威夏省龙山金矿地质特征及其成矿分析[J]. 中国矿业, 2017, 26(7): 151-154.
Dai K M. Analysis of Longshan gold mine geological characteristic and its origin in Preah-Vihear, the Kingdom of Cambodia[J]. China Mining Magazine, 2017, 26(7): 151-154.
[16] 黄敦杰, 彭振安, 刘元春, 等. 柬埔寨柏威夏省罗文铁矿床地质特征及成因浅析[J]. 西北地质, 2014, 47(1): 197-207. doi: 10.3969/j.issn.1009-6248.2014.01.018
Huang D J, Peng Z A, Liu Y C, et al. Geological characteristics and genesis of Luowen iron deposit in Preah Vihear of Cambodia[J]. Northwestern Geology, 2014, 47(1): 197-207. doi: 10.3969/j.issn.1009-6248.2014.01.018
[17] 黄为俊, 张楠, 贾嵩, 等. 动力三角翼低空磁测在多宝山地区的应用效果[J]. 世界地质, 2017, 36(1): 241-245. doi: 10.3969/j.issn.1004-5589.2017.01.023
Huang W J, Zhang N, Jia S, et al. Application effect of magnetic survey with dynamic delta wing at low altitude in Duobaoshan area[J]. Global Geology, 2017, 36(1): 241-245. doi: 10.3969/j.issn.1004-5589.2017.01.023
[18] 王庆乙, 行英弟, 蒋彬, 等. MAMSS-1超低空高精度航磁系统的研制[J]. 物探与化探, 2010, 34(6): 712-716.
Wang Q Y, Xing Y D, Jiang B, et al. The design and development of the MAMSS-1 type minimum altitude high-precision aeromagnetic system[J]. Geophysical and Geochemical Exploration, 2010, 34(6): 712-716.
[19] 张楠, 贾嵩, 蒋彬, 等. 高精度低空磁测在火山岩构造区的应用[J]. 矿产勘查, 2017, 8(5): 881-888. doi: 10.3969/j.issn.1674-7801.2017.05.020
Zhang N, Jia S, Jiang B, et al. Application of high-accuracy and low-altitude aeromagnetic survey in the volcanic tectonic area[J]. Mineral Exploration, 2017, 8(5): 881-888. doi: 10.3969/j.issn.1674-7801.2017.05.020
[20] 张津伟, 武力聪, 杨春, 等. 几种低空高精度航空磁测系统及找矿应用分析[J]. 矿产与地质, 2014, 28(1): 124-128. doi: 10.3969/j.issn.1001-5663.2014.01.021
Zhang J W, Wu L C, Yang C, et al. Several high resolution aeromagnetic systems surveyed at very low altitude and mine prospecting application analysis[J]. Mineral Resources and Geology, 2014, 28(1): 124-128. doi: 10.3969/j.issn.1001-5663.2014.01.021
[21] 江志强, 王建飞. 航磁梯度数据解释新方法在迁安铁矿勘探中的应用[J]. 世界地质, 2017, 36(3): 947-953, 963. doi: 10.3969/j.issn.1004-5589.2017.03.028
Jiang Z Q, Wang J F. New interpretation methods of aeromagnetic gradient data in application of iron mine exploration of Qianan area[J]. Global Geology, 2017, 36(3): 947-953, 963. doi: 10.3969/j.issn.1004-5589.2017.03.028
[22] 高小光, 张勇. 低纬度地区磁法勘探工作体会[J]. 资源环境与工程, 2011, 25(3): 269-271. doi: 10.3969/j.issn.1671-1211.2011.03.021
Gao X G, Zhang Y. Work experience of magnetic prospecting in low latitude region[J]. Resources Environment & Engineering, 2011, 25(3): 269-271. doi: 10.3969/j.issn.1671-1211.2011.03.021
[23] 曹军, 敬荣中, 赵毅, 等. 带约束的化极在低纬度、高剩磁地区的应用——以柬埔寨Oyadao金矿为例[J]. 矿产与地质, 2018, 32(2): 334-339. doi: 10.3969/j.issn.1001-5663.2018.02.021
Cao J, Jing R Z, Zhao Y, et al. Application of constrained pole change in low latitude and high residual geomagnetic field area: Results from field application to Oyadao gold deposit, Cambodia[J]. Mineral Resources and Geology, 2018, 32(2): 334-339. doi: 10.3969/j.issn.1001-5663.2018.02.021
[24] 胡庆辉. 低纬度地区磁异常化极技术在铬铁矿勘查中应用——以柬埔寨王国菩萨省布蔑地区为例[J]. 矿产勘查, 2019, 10(7): 1679-1686. doi: 10.3969/j.issn.1674-7801.2019.07.020
Hu Q H. The application of reduction to the pole of magnetic anomalies at low latitude in Chromite deposit survey: The case of Puokmea area, Pursat Province of Cambodia[J]. Mineral Exploration, 2019, 10(7): 1679-1686. doi: 10.3969/j.issn.1674-7801.2019.07.020
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