金属活动态测量在冲积平原覆盖区隐伏矿的试验研究——以安徽无为龙潭头硫铁矿为例
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摘要
随着出露区矿产资源的日益枯竭,覆盖区已逐渐成为矿产勘查的重点。传统化探方法难以在覆盖区发挥作用,而金属活动态测量法可以提取与深部隐伏矿体有关的矿化信息。该方法在冲积平原覆盖区还缺乏相关研究。以安徽无为龙潭头隐伏硫铁矿为例,开展土壤全量和金属活动态测量的试验研究。结果显示:土壤全量测量在隐伏矿体上方无异常显示。金属活动态测量中,Cu和S元素的水溶态,Fe元素的铁锰氧化物态和吸附态均呈现出高异常值,异常衬度达到2及以上。其中S元素的水溶态异常最明显,含量峰值达14.8×10~(-9),背景值为4.81×10~(-9),异常衬度3.08。其次,Cu元素的有机态和S元素的铁锰氧化物态呈现较高异常,异常衬度1.5以上。金属活动态测量提取的异常均位于隐伏矿体上方,且与赋矿主断裂空间关系密切。本次试验研究表明,金属活动态测量可以有效提取与龙潭头隐伏矿床有关的地球化学异常,该方法在冲积平原覆盖区应当有着较好的应用前景,但仍需要更进一步地研究,以建立相应的方法技术流程与标准。
With the depletion of mineral resources in outcropping areas, covered areas have gradually become the focus of mineral exploration. But traditional exploration of geochemical method can not be used in the covered areas. selective leaching of mobile metals in overburden(MOMEO) can extract geochemical information related to deep concealed orebodies. However, there is a lack of application of this method in alluvial plain terrain. Taking the Longtantou concealed pyrite in Anhui province as an example, soil geochemical survey was carried out by comparing the results from total digestion and the MOMEO. The results showed that there are no geochemical abnormal of elements in the total digestion. On the contrary, selective leach delivered satisfactory result. The water soluble state of Cu and S, the ferromanganese oxidized Fe showed high anomalies, and the abnormal contrast was over 2. The water soluble state of S is the most obvious one. The peak value is 14.8×10-9, the background value is 4.81×10-9, and the abnormal contrast is 3.08. The organic state of Cu and S, the ferromanganese oxidized of S showed high abnormality, and the anomaly contrast was about 1.5.The anomalies occur right above the ore body and/or the concealed fault which cut off the ore bodies. The above results show that the MOMEO can obtain geochemical anomalies over the hidden pyrite deposit of Longtantou. This method should have a good application prospect in alluvial plain terrain, but further research is still needed to establish the technical procedures and standards.
With the depletion of mineral resources in outcropping areas, covered areas have gradually become the focus of mineral exploration. But traditional exploration of geochemical method can not be used in the covered areas. selective leaching of mobile metals in overburden(MOMEO) can extract geochemical information related to deep concealed orebodies. However, there is a lack of application of this method in alluvial plain terrain. Taking the Longtantou concealed pyrite in Anhui province as an example, soil geochemical survey was carried out by comparing the results from total digestion and the MOMEO. The results showed that there are no geochemical abnormal of elements in the total digestion. On the contrary, selective leach delivered satisfactory result. The water soluble state of Cu and S, the ferromanganese oxidized Fe showed high anomalies, and the abnormal contrast was over 2. The water soluble state of S is the most obvious one. The peak value is 14.8×10-9, the background value is 4.81×10-9, and the abnormal contrast is 3.08. The organic state of Cu and S, the ferromanganese oxidized of S showed high abnormality, and the anomaly contrast was about 1.5.The anomalies occur right above the ore body and/or the concealed fault which cut off the ore bodies. The above results show that the MOMEO can obtain geochemical anomalies over the hidden pyrite deposit of Longtantou. This method should have a good application prospect in alluvial plain terrain, but further research is still needed to establish the technical procedures and standards.
引文
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[13] 董树文,马立成,刘刚,等.论长江中下游成矿动力学[J].地质学报,2011,85(5):612-625.DONG S W,MA L C,LIU G,et al.On dynamics of the metallogenic belt of middle-lowerreaches of Yangtze river,eastern China [J].Acta Geologica Sinica,2011,85(5):612-625.(In Chinese)
[14] 胡彦强.无为县龙潭头地区铜金铁矿普查阶段性地质报告[R].合肥:华东冶金八一五地质队,2015.HU Y Q.Geological Report on the Census of Copper-Gold-Iron Ores in Longtantou Area,Wuwei County [R].Hefei:East China Metallurgical 815 Geological Team,2015.(In Chinese)
[15] 程志中,王学求,刘大文.冲积物覆盖区活动态金属在土壤中的分配规律[J].地质地球化学,2002,30(2):46-48.CHENG Z Z,WANG X Q,LIU D W.Distribution of mobile forms of metals in alluvium terrains [J].Geology Geochemistry,2002,30(2):46-48.(In Chinese)
[16] 涂光炽.低温地球化学[M].北京:科学出版社,1998.TU G C.Low Temperature geochemistry[M].Beijing:Science Press,1998.(In Chinese)
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[18] 赵波,龚敏,熊燃,等.湿润中低山景观下土壤金属活动态找矿试验[J].物探与化探,2012,36(6):902-906.ZHAO B,GONG M,XIONG R,et al.Soil metallic active state prospecting test under the condition of humid low-mountain landscape [J].Geophysical and Geochemical Exploration,2012,36(6):902-906.(In Chinese)
[19] WANG X,WEN X,RONG Y,et al.Vertical variations and dispersion of elements in arid desertregolith:a case study from the Jinwozi gold deposit,northwestern China[J].Geochemistry Exploration Environment Analysis,2007,7(2):163-171.
[20] ANAND R R,ASPANDIAR M F,NOBLE R R P.A review of metal transfer mechanisms through transported cover with emphasis on the vadose zone within the Australian regolith[J].Ore Geology Reviews,2016,73:394-416.
[21] 程志中,王学求,喻劲松.深穿透地球化学方法在黄土覆盖区的应用[J].矿床地质,2002,21:1124-1127.CHENG Z Z,WANG X Q,YU J S.Application of deep-penetration geochemistry in Loess Terrain:A case of Zhangquanzhuang gold deposit[J].Mineral Deposits,2002,21:1124-1127.(In Chinese)
[2] 王学求,刘占元,白金峰,等.深穿透地球化学对比研究两例[J].物探化探计算技术,2005,27(3):250-255.WANG X Q,LIU Z Y,BAI J F,et al.Deep-penetration geochemistry-comparison studies of two concealed deposits [J].Computing Techniques for Geophysical and Geochemical Exploration,2005,27(3):250-255.(In Chinese)
[3] 王学求,谢学锦,卢荫麻.地气动态提取技术的研制及在寻找隐伏矿上的初步试验[J].物探与化探,1995,19(3):161-171.WANG X Q,XIE X J,LU Y M.Dynamic collection of geogas and its preliminary application in search for concealed deposits [J].Geophysical and Geochemical Exploration,1995,19(3):161-171.(In Chinese)
[4] WANG XUEQIU.Leaching of mobile forms of metals in overburden development and applications[J].Geochem.Explor,1998,67:39-55.
[5] 刘占元.电地球化学勘查的理论与方法[A].谢学锦,邵跃,王学求.走向21世纪矿产勘查地球化学[C].北京:地质出版社,1999.LIU Z Y.Theory and method of Electrogeochemical exploration[A].XIE X J,SHAO Y,WANG X Q.Mineral exploration geochemistry in 21 Century[C].Beijing:Geological Publishing House,1999.(In Chinese)
[6] 伦知颍,程志中,严光生,等.中国不同景观区水系沉积物中39种元素的背景值[J].地学前缘,2015,22(5):226-230.LUN Z Y,ZHENG Z Z,YAN G S,et al.Concentrations of 39 elements in stream sediment in different landscape zones of China[J].Earth Science Frontiers,2015,22(5):226-230.(In Chinese)
[7] 叶荣,王学求,赵伦山,等.戈壁覆盖区金窝子矿带深穿透地球化学方法研究[J].地质与勘探,2004,40(6):65-70.YE R,WANG X Q,ZHAO L S,et al.Deep penetration geochemistry methods in gobi--overburden terrain of the jinwozi metallogenic belt [J].Geology and Exploration,2004,40(6):65-70.(In Chinese)
[8] 李通国,朱有新,李文胜,等.深穿透地球化学方法找金—以甘南草甸覆盖区为例[J].地质与勘探,2005,41(1):51-55.LI T G,ZHU Y X,LI W S,et al.The geochemical prospecting method of deep penetration in the southern gansu area [J].Geology and Exploration,2005,41(1):51-55.(In Chinese)
[9] 陈希泉,罗先熔,文雪琴.内蒙古额尔古纳虎拉林金矿区金属元素活动态测量法找矿试验[J].矿产与地质,2006,20(4/5):475-478.CHEN X Q,LUO X R,WEN X Q.Analysis on the test results of MOMEO of Haruleaobao mining area Xinbaerhu Right Banner,Inner Mongolia [J].Mineral Resources and Geology,2006,20(4/5):475-478.(In Chinese)
[10] 文雪琴.金属活动态提取法及其在黑龙江大兴安岭森林覆盖区的应用[J].地球科学与环境学报,2006,28(4):43- 48.WEN X Q.Metal dynamic extraction method and its application in forest cover area of Heilongjiang Greater Khingan Range[J].Journal of Earth Sciences and Environment,2006,28(4):43-48.(In Chinese)
[11] 毛景文,邵拥军,谢桂青,等.长江中下游成矿带铜陵矿集区铜多金属矿床模型[J].矿床地质,2009,28(2):109-119.MAO J W,SHAO Y J,XIE G Q,et al.Mineral deposit model for porphyry-skarn polymetallic copper deposits in Tongling ore dense district of Middle-Lower Yangtze Valley metallogenic belt[J].Mineral Deposits,2009,28(2):109-119.(In Chinese)
[12] 周涛发,王世伟,袁峰,等.长江中下游成矿带陆内斑岩型矿床的成岩成矿作用[J].岩石学报,2016,32(2):271-288.ZHOU T F,WANG S W,YUAN F,et al.Magmatism and related mineralization of the intracontinental porphyry deposits in the middle-lower yangtze river valley metallogenic belt[J].Acta Petrologica Sinica,2016,32(2):271-288.(In Chinese)
[13] 董树文,马立成,刘刚,等.论长江中下游成矿动力学[J].地质学报,2011,85(5):612-625.DONG S W,MA L C,LIU G,et al.On dynamics of the metallogenic belt of middle-lowerreaches of Yangtze river,eastern China [J].Acta Geologica Sinica,2011,85(5):612-625.(In Chinese)
[14] 胡彦强.无为县龙潭头地区铜金铁矿普查阶段性地质报告[R].合肥:华东冶金八一五地质队,2015.HU Y Q.Geological Report on the Census of Copper-Gold-Iron Ores in Longtantou Area,Wuwei County [R].Hefei:East China Metallurgical 815 Geological Team,2015.(In Chinese)
[15] 程志中,王学求,刘大文.冲积物覆盖区活动态金属在土壤中的分配规律[J].地质地球化学,2002,30(2):46-48.CHENG Z Z,WANG X Q,LIU D W.Distribution of mobile forms of metals in alluvium terrains [J].Geology Geochemistry,2002,30(2):46-48.(In Chinese)
[16] 涂光炽.低温地球化学[M].北京:科学出版社,1998.TU G C.Low Temperature geochemistry[M].Beijing:Science Press,1998.(In Chinese)
[17] 王学求,谢学锦.颗粒金的分布及其变化规律的研究[J].地球物理地球化学研究所所刊,1994(6):17-21.WANG X Q,XIE X J.Study on the distribution and variation of particle gold[J].Journal of Geophysical and Geochemical Institute,1994(6):17-21.(In Chinese)
[18] 赵波,龚敏,熊燃,等.湿润中低山景观下土壤金属活动态找矿试验[J].物探与化探,2012,36(6):902-906.ZHAO B,GONG M,XIONG R,et al.Soil metallic active state prospecting test under the condition of humid low-mountain landscape [J].Geophysical and Geochemical Exploration,2012,36(6):902-906.(In Chinese)
[19] WANG X,WEN X,RONG Y,et al.Vertical variations and dispersion of elements in arid desertregolith:a case study from the Jinwozi gold deposit,northwestern China[J].Geochemistry Exploration Environment Analysis,2007,7(2):163-171.
[20] ANAND R R,ASPANDIAR M F,NOBLE R R P.A review of metal transfer mechanisms through transported cover with emphasis on the vadose zone within the Australian regolith[J].Ore Geology Reviews,2016,73:394-416.
[21] 程志中,王学求,喻劲松.深穿透地球化学方法在黄土覆盖区的应用[J].矿床地质,2002,21:1124-1127.CHENG Z Z,WANG X Q,YU J S.Application of deep-penetration geochemistry in Loess Terrain:A case of Zhangquanzhuang gold deposit[J].Mineral Deposits,2002,21:1124-1127.(In Chinese)