中性盐溶液提取土壤中金属活动态及其对隐伏矿的指示:以甲基卡稀有金属矿区为例
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摘要
以甲基卡稀有金属矿区X03号超大型稀有金属矿体以及804号脉等两个典型隐伏矿体作为研究对象,采用硫酸钾(K_2SO_4)中性盐溶液作为金属活动态提取剂,进行了土壤中Li元素活动态的提取试验。结果表明,Li元素活动态的地球化学异常很好地对应了隐伏矿体的位置,能够有效地指示隐伏矿体的存在。在甲基卡土壤中目标元素内生组分/外生组分比值很高的稀有金属矿区,采用中性盐溶液这类弱提取剂,才能最大程度地排除土壤内生组分的干扰,有效识别隐伏矿体。通过提取条件优化实验,在甲基卡地区采用硫酸钾(K_2SO_4)溶液提取土壤中Li元素活动态的最佳技术参数为:提取剂浓度0.2 mol/L,粒级200目,pH为6.82,固液比为1:5,提取时间为48 h。
In the present study, potassium sulfate(K_2SO_4) solution was used to selectively extract the mobile forms of lithium(Li)element from two soil samples collected from Jiajika, a rare metal mining area(No.X03 super-large rare metal orebody and No. 804 vein). The results show that the geochemical anomaly of Li mobile form is well corresponded to the position of concealed orebody, which can effectively indicate the existence of a concealed orebody. For soils containing high content of endogenous component/exogenous component of target elements in Jiajika area, weak extracts such as neutral salt solution are the best choice to maximally eliminate the disturbance of endogenous components. The best extraction procedure of the mobile forms of Li element in the soil samples is as follows.2 g soil(200 mesh) is extracted by 10 mL 0.2 mol/LK_2SO_4 solution(pH = 6.82) for 48 h.
In the present study, potassium sulfate(K_2SO_4) solution was used to selectively extract the mobile forms of lithium(Li)element from two soil samples collected from Jiajika, a rare metal mining area(No.X03 super-large rare metal orebody and No. 804 vein). The results show that the geochemical anomaly of Li mobile form is well corresponded to the position of concealed orebody, which can effectively indicate the existence of a concealed orebody. For soils containing high content of endogenous component/exogenous component of target elements in Jiajika area, weak extracts such as neutral salt solution are the best choice to maximally eliminate the disturbance of endogenous components. The best extraction procedure of the mobile forms of Li element in the soil samples is as follows.2 g soil(200 mesh) is extracted by 10 mL 0.2 mol/LK_2SO_4 solution(pH = 6.82) for 48 h.
引文
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张必敏.2011.戈壁覆盖区深穿透地球化学异常形成机理与找矿方法[D].中国地质科学院.
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Wang X Q.1998.Leaching of mobile forms of metals in overburden:development and application[J].Joumal of Geochemical Exploration,61(1-3):39-55.
付小方,侯立玮,王登红,等.2014.四川甘孜甲基卡锂辉石矿矿产调查评价成果[J].中国地质调查,1(3):37-43.
付小方,袁蔺平,王登红,等.2015.四川甲基卡矿田新三号稀有金属矿脉的成矿特征与勘查模型[J].矿床地质,34(6):1172-1186.
付小方,侯立伟,梁斌,等.2017.甲基卡式花岗伟晶岩型锂矿床成矿模式与三维勘查找矿模型[M].北京:科学出版社.
侯立玮,付小方.2002.松潘-甘孜造山带东缘穹窿状变质地质体[M].成都:四川大学出版社.
刘红艳,王学求.2006.金属活动态提取技术在十红滩铀矿的应用[J].吉林大学学报(地球科学版),36(2):183-186.
聂兰仕,程志中,王学求,等.2007.深穿透地球化学方法对比研究--以内蒙古花敖包特铅锌矿为例[J].地质通报,26(12):1574-1578.
王登红,付小方.2013.四川甲基卡外围锂矿找矿取得突破[J].岩矿测试,32(6):987-987.
王登红,王瑞江,李建康,等.2013.中国三稀矿产资源战略调查研究进展综述[J].中国地质,40(2):361-370.
王学求,程志中.1996.元素活动态测量技术的发展及其意义[J].国外地质勘探技术,4(2):17-22.
王学求,谢学锦.1996.非传统金矿化探的理论与方法技术研究[J].地质学报,70(1):84-95.
王学求.2000.巨型矿床与大型矿集区勘查地球化学[J].矿床地质,19(1):76-87.
王学求,程志中,迟清华,等.2002.吐哈盆地砂岩型铀矿战略性地球化学调查与评价[J].地质与勘探,3(10):148-151.
王学求.2005.深穿透地球化学迁移模型[J].地质通报,24(10):892-896.
文雪琴.2006.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,28(4):43-48.
谢学锦.1998.战术性与战略性的深穿透地球化学方法[J].地学前缘,5(2):171-183.
谢学锦,王学求.2003.深穿透地球化学新进展[J].地学前缘,10(1):225-238.
徐志刚,陈毓川,王登红,等.2008.中国成矿区带划分方案山[M].北京:地质出版社.
徐洋.2015.覆盖区隐伏矿地球化学弱信息提取技术研究[D].中国地质大学(北京).
叶荣,王学求,赵伦山,等.2004.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,40(6):65-70.
叶庆森,杨尚海,杨建新.2005.元素活动态测量法在鄂尔多斯盆地砂岩型铀矿勘查中的应用[J].地质通报,24(11):1007-1012.
姚文生.2011.元素活动态提取剂作用机理与实验条件研究[D].中国地质科学院.
张必敏.2011.戈壁覆盖区深穿透地球化学异常形成机理与找矿方法[D].中国地质科学院.
Antropova L V,Goldberg I S,Voroshilov N A,et al.1992.New methods of regional exploration for blind mineralization:application in the USSR[J].Journal of Geochemical Exploration,43(2):157-166.
Cameron E M,Hamilton S M,Leybourne M I,et al.2004.Finding deeply buried deposits using geochemistry[J].Geochemistry Exploration Environment Analysis,4(1):7-32.
Clark R J,Meier A L and Riddle G.1990.Enzyme leaching of surficial geochemical samples for detecting hydromorphic trace-element anomalies associated with precious-metal mineralized bedrock buried beneath glacial overburdeninNorthernMinnesota[J].GOLD90’,189-207.
Dalrymple L J.2007.An approach to the optimisation of partial extractions for geochemicalexploration[D].Sydney:University of New South Wales.
Hall K J.1998.Studies on the mode of action of emulsified oil additives for agrochemicals[J].Surface Engineering&Applied Electrochemistry,51(2):111-117.
Klusman R W.2009.Transport of ultratrace reduced gases and particulate,near-surface oxidation,metal deposition and adsorption[J].Geochemistry Exploration Environment Analysis,9(3):203-213.
Mann A W,Birrell R D,Fedikow M A F,et al.2005.Vertical ionic migration:Mechanisms,soil anomalies,and sampling depth for mineral exploration[J].Geochemistry Exploration Environment Analysis,5(3):201-210.
Nolan A L,Baltpurvins K,Hamilton I C,et al.2003.Chemostat-controlled selective leaches of model soil phases-The hydrous manganese and iron oxides.Part 1[J].Geochemistry Exploration Environment Analysis,3(2):157-168.
Rate A W,Hamon R E,Bettenay L F,et al.2016.Adjustment of weak partial extraction data assuming metal ion adsorption:examples using bulk cyanide leach[J].Geochemistry Exploration Environment Analysis,10(2):199-206.
Wang X Q.1998.Leaching of mobile forms of metals in overburden:development and application[J].Joumal of Geochemical Exploration,61(1-3):39-55.