曹窑以西煤下铝土矿床伴生轻稀土、锂、镓矿产分布特征及资源潜力.pdf

第 14 卷 第 9 期2023 年 9 月Vol.14 No.9September，2023矿 产 勘 查MINERAL EXPLORATION曹窑以西煤下铝土矿床伴生轻稀土、锂、镓矿产分布特征及资源潜力董化祥1，2，谢祥1，2，3，禹明高1，2，陈勇1，2（1.河南省有色金属地质矿产局第六地质大队，河南 郑州 450016；2.河南省第六地质大队有限公司，河南 郑州 450016；3.河南省自然资源科技创新中心（废弃矿山再利用研究），河南 郑州 450016）摘 要 曹窑以西煤下铝矿床位于豫西陕（县）渑（池）新（安）铝土矿成矿带上，该区铝土矿成矿条件良好，已发现多个大中型铝土矿矿床。但对铝土矿伴生轻稀土、锂、镓等矿产的成矿规律及资源潜力研究略有不足，为进一步研究豫西陕渑新成矿带铝土矿伴生“三稀”矿产的成矿规律及资源潜力，本文在曹窑以西煤下铝矿区普查、详查（五门沟、柴洼、关底沃、扣门山、黄漫、青阳沟矿段）资料的基础上，系统采集矿区钻孔内铝土矿及围岩148件样品进行分析研究等工作，重点研究两者相关性，轻稀土、锂、镓分布规律及与铝土矿厚度关系等。研究结果表明：区内含铝岩系轻稀土、锂、镓等矿化明显；“三稀”元素在垂向上主要在铝土矿中富集，且与铝土矿埋深无明显关系；Al2O3和TiO2、Ga、Li均呈正相关，与REE呈负相关；矿区内初步资源量估算，轻稀土资源量为127512.23 t，镓资源量为12230.61 t，氧化锂资源量为28412.55 t。综合认为陕渑新铝土矿成矿带“三稀”资源潜力较大。关键词 三稀；铝土矿；煤下铝；陕渑新铝土矿带；豫西中图分类号：P67 文献标志码：A 文章编号：1674-7801（2023）09-1641-11The distribution characteristics and resource potential of light rare earth，lithium and gallium minerals associated with the undercoal bauxite deposit west of CaoyaoDONG Huaxiang1，2，XIE Xiang1，2，3，YU Minggao1，2，CHEN Yong1，2（1.The Sixth Geological Brigade of Henan Nonferrous Metals Geology and Mineral Resources Bureau，Zhengzhou 450016，Henan，China；2.Henan Sixth Geological Brigade Co.，Ltd.，Zhengzhou 450016，Henan，China；3.Henan Natural Resources Science and Technology Innovation Center（Research on the Reuse of Abandoned Mines），Zhengzhou 450016，Henan，China）doi：10.20008/j.kckc.202309010收稿日期 2023-05-14；修回日期 2023-07-07基金项目 本文受河南省铝土矿及伴生“三稀”矿产成矿规律研究（JTZDKY202305）资助。第一作者简介 董化祥，男，1987年生，工程师，从事区域地质调查、矿产勘查工作；E-mail：。通讯作者简介 谢祥，男，1988年生，硕士，从事区域地质调查、矿产勘查、地球化学勘查工作；E-mail：。引用格式 董化祥，谢祥，禹明高，陈勇.2023.曹窑以西煤下铝土矿床伴生轻稀土、锂、镓矿产分布特征及资源潜力 J.矿产勘查，14（9）：1641-1651.Dong Huaxiang，Xie Xiang，Yu Minggao，Chen Yong.2023.The distribution characteristics and resource potential of light rare earth，lithium and gallium minerals associated with the undercoal bauxite deposit west of Caoyao J.Mineral Exploration，14（9）：1641-1651.16412023 年矿产勘查Abstract:The undercoal aluminum deposit west of Caoyao is located in the Shaan（xian）-Mian（ci）-Xin（an）bauxite metallogenic belt in western Henan Province.The bauxite metallogenic conditions are good in this area，and several large and medium-sized bauxite deposits have been found.However，the metallogenic regularity and resource potential of light rare earth，lithium，gallium and other minerals associated with bauxite are not well studied.In order to further study the metallogenic regularity and resource potential of the rare earth，rare metal and rare-scattered minerals associated with bauxite in the new metallogenic belt of Shanxi Province，this paper，based on the general survey and detailed investigation of the subcoal aluminum mining area west of Caoyao（Wumengou，Chaiwa，Guadiwo，Koumenshan，Huangman，Qingyanggou ore section），148 samples of bauxite and surrounding rock in the borehole of the mining area were systematically collected for analysis and research，focusing on the correlation between the two，the distribution of light rare earth，lithium and gallium and the relationship between the thickness of bauxite.The results show that the mineralization of light rare earth，lithium and gallium in aluminium-bearing rock series is obvious.The rare earth，rare metal and rare-scattered elements are mainly enriched in the vertical bauxite，and there is no obvious relationship with the buried depth of bauxite.Al2O3 was positively correlated with TiO2，Ga and Li，and negatively correlated with REE.The preliminary resources in the mining area are estimated to be 127512.23 t of light rare earth resources，12230.61 t of gallium resources and 28412.55 t of lithium oxide resources.It is concluded that Shaan（xian）-Mian（ci）-Xin（an）bauxite metallogenic belt has great potential of three rare resources.Keywords:rare earth，rare metal and rare-scattered；bauxite；aluminum under coal；Shaan（xian）-Mian（ci）-Xin（an）bauxite belt0引言铝土矿是中国重要矿产资源，在经济和社会发展中起着重要支撑作用（罗小南，2011；董运如等，2019；唐波等，2021）。在铝土矿的形成过程中，同时富集一些稀有和稀土元素（孙凤余，2019）。“三稀”矿产是新一代尖端武器、信息技术、节能环保、医药和医疗设备、高端装备制造、新材料、新能源汽车等所需要的功能材料、结构材料和关键性原料（王登红等，2016），随着国际上“三稀”金属的热度持续走高，对沉积性铝土矿伴生“三稀”矿产研究稍有欠缺（温静静等，2015）。豫西陕（县）渑（池）新（安）铝土矿成矿带是河南省重要的铝土矿成矿区带，资源潜力巨大。中国铝土矿矿床可分为古风化壳型（也可称为沉积型）和红土型（廖士范，1994；马玉见等，2012；刘海鹏等，2022；徐伟等，2022），沉积型矿床占中国铝土矿总储量的98%（朱东晖等，2009）。本文以河南省渑池县曹窑以西铝土矿床（11121411114320，344114345234）为载体，对其伴生“三稀”矿产进行系统的研究，并探讨该区铝土矿伴生“三稀”资源潜力。1地质特征1.1区域地质特征研究区大地构造位置处于华北地台南缘，华熊台缘坳陷之渑池确山陷褶断束的西北部（闫石，2013；唐华东，2018）。区域上位于豫西陕（县）渑（池）新（安）铝土矿带。区域地层从老到新依次为中元古界熊耳群、汝阳群，新元古界洛峪群、震旦系、寒武系、奥陶系、石炭系、二叠系、三叠系、侏罗系、白垩系，新生界新近系和第四系（李国平和张瑜麟，2013）（图1）。本区处于渑池向斜北翼，断裂发育，岩浆岩活动弱，花岗斑岩零星出露。1.2矿区地质特征该区铝土矿成矿地质条件良好，具较大找矿潜力，20世纪60年代以来，在该地区发现贾家洼、曹窑、小阳河、水泉洼、曹窑煤矿深部铝土矿等多个大中型铝土矿床，使该区成为河南省最重要的富铝土矿带。矿区出露地层有奥陶系寒武系灰岩、白云岩等；石炭系为该区含铝岩系；二叠系为矿区含煤岩系；新近系为砾岩及第四系黄土组成（图1）。构造、岩浆活动不发育（唐华东等，2020）。1642第 14 卷 第 9 期 董化祥等：曹窑以西煤下铝土矿整装勘项目伴生轻稀土、锂、镓矿产分布特征及资源潜力1.3 矿体地质特征矿区内共圈出铝土矿矿体 22 个，矿体走向北东，全区铝土矿矿体赋存标高是 568.76-424.77 m，埋深2.601025.02 m。矿石的矿物成分主要为一水硬铝石，次为高岭石等。铝土矿主要有碎屑状、砂（粒）状、蜂窝状、豆鲕状、致密状结构。2样品采集及测试结果2.1样品采集河南省渑池县曹窑以西煤下铝普、详查工作时已完成部分“三稀”元素的组合分析工作，在已有的工作基础上按一定网度抽取22个钻孔在铝土矿副样中按照地层进行组合化验分析。另外对青阳沟详查钻孔 HZK3250、HZK4456 中 P1x、C2b 地层分段取样，分析“三稀”元素的分布规律。分样严格按不同矿种、不同矿石类型、不同结构构造、不同孔径进行。地质人员分样后，经专人进行检查后采取，无混采漏采现象，采样质量可靠，矿区采样质量符合要求。2.2样品测试本研究共对24个钻孔取样148件，测试元素为Li、Rb、Re、Sr、Ga、Zr、Nb、V、Th、La、Ce、Pr、Nd、Sm、图1曹窑以西煤下铝土矿区域地质图1第四系；2古近系新近系；3三叠系；4二叠系；5石炭系；6奥陶系；7寒武系；8震旦系；9闪长斑岩；10石英斑岩；11断层；12地质界线；13研究区范围16432023 年矿产勘查Eu。样品测试由河南省有色金属地质勘查总院检测中心承担，外检由河南省地质矿产勘查开发局第一地质矿产调查院实验室承担。微量元素Li、Ga、Zr、Nb和LREE元素使用等离子体质谱法（ICP-MS）分析测试，仪器型号为Thermo Fisher X series2。样品采集、分析过程严格依据国家标准执行，质量控制参数均合格。曹窑煤下铝土矿伴生“三稀”含量分析结果见表1。表1曹窑煤下铝土矿伴生“三稀”含量分析结果12345678ZK0728ZK0734ZK1536ZK2326ZK2730ZK4320ZK5120ZK5518123412345123456123457812123456123456781炭质页岩铁矾土铝土矿菱铁页岩铁矾土铝土矿菱铁页岩铁矾土菱铁页岩黏土页岩黏土矿铝土矿菱铁页岩菱铁矿菱铁页岩黏土页岩铝土矿菱铁页岩菱铁矿铁矾土菱铁矿菱铁页岩铁矾土铝土矿黏土矿铝土矿菱铁页岩菱铁矿菱铁页岩菱铁矿黏土页岩铝土矿黏土矿铝土矿铁矾土赤铁矿菱铁矿菱铁页岩黏土矿239.41626.01703.0478.42268.0242.1208.7328.8364.4184.6373.6344.9207.736.541.71289.0557.7376.2297.3683.5256.4664.41326.0116.6569.5126.3224.2174.2577.1745.8616.71475793.9588.3584.4232.9232.8344.1660.322.0819.2014.7423.3517.1013.2313.7721.7820.5424.1823.0916.7515.9114.7010.9823.6717.6515.8812.0022.9512.0524.0923.3111.9730.6615.5213.9013.9819.2220.3421.3912.0618.5914.5714.8410.0311.3428.0722.2898.309.3615.0484.616.2719.2629.8250.7184.93121.2090.9839.8463.16119.1085.0019.6529.4155.5345.57166.6086.41169.40261.2056.6834.2343.4264.9479.06123.20113.6012.5717.4357.27116.90165.7087.96147.50284.0042.71218.9124.3345.6543.9230.2918.1327.7639.2624.3238.6576.5721.3225.167.3117.2119.4584.1409.3296.2561.1538.7446.3184.1734.5195.4479.4357.7471.2748.61154.095.7277.6334.4465.91055303.6230.0238.6162.116.6023.9361.6937.8435.7659.4243.5543.5834.8520.2947.5951.8926.5113.4414.2035.3054.4432.7325.6630.6318.4036.7745.3661.5464.1878.5053.6137.3536.9631.8243.2637.4555.6459.3646.2318.7720.5643.7944.690.040.020.020.030.010.020.020.020.030.010.030.020.010.010.010.010.020.010.010.030.010.010.010.010.010.010.010.020.020.020.010.010.020.030.040.020.010.010.01244.87265.39492.731006.15420.63804.15766.391135.67652.41238.631042.14855.47312.09172.67188.36246.54909.30684.13492.32515.64480.71619.52410.63521.0469.41480.66600.68727.49712.12661.10203.35230.651359.21768.44861.85412.99357.96674.72401.1295.70109.77131.36354.58136.09147.99172.88178.59336.82104.23457.93284.13124.8181.2960.18126.45188.45175.61137.81309.59117.44158.09111.29124.4678.48117.61140.07233.56194.58202.4889.33104.73334.61353.28572.69258.67177.97153.7880.28序号工程号样号岩性名称检测结果/(g/g)LiGaRbSrNbReLREEHREE1644第 14 卷 第 9 期 董化祥等：曹窑以西煤下铝土矿整装勘项目伴生轻稀土、锂、镓矿产分布特征及资源潜力9101112131415ZK5516ZK7112ZK7120ZK7912ZK7916ZK0780ZK15002345612345123123451234561234567812345612456铝土矿黏土矿菱铁页岩菱铁矿赤铁矿黏土矿铝土矿铁矾土菱铁矿菱铁页岩黏土矿铝土矿菱铁页岩黏土矿铝土矿菱铁矿赤铁矿铁质页岩菱铁页岩菱铁矿黏土矿铝土矿铁矾土菱铁矿黏土矿铝土矿黏土矿铝土矿黏土矿赤铁矿页岩页岩黏土矿铁矾土铝土矿页岩铁矾土页岩黏土岩铝土矿铁矾土铝土矿页岩583.7672.6616.4441.5137.5630.1695.8716.4428.9512.7644.2107.5489.3405.0553.9145.7241.9293.9392.1178.7749.8714.1358.7127.9426.2477.5654.9466.1516.7239.8411.6276.0877.31296.0931.7743.1226.388.3341.3154.02212.02228.01733.015.7826.0520.0217.4611.0922.9920.7825.9912.8022.4430.5318.9424.7329.9916.1910.0014.7123.2325.9113.9431.9417.7027.7719.7324.7716.3318.4518.7317.9313.8023.0322.2328.9126.1914.8426.2828.2630.5615.5910.4518.6412.9515.3881.3455.8373.1949.60106.8020.1797.6941.3948.25258.6059.1648.04272.2068.9044.21110.90114.60233.80103.3098.9943.06137.60342.60185.7029.3634.0742.6792.37158.50199.10325.90314.2065.6056.7019.2538.78153.10258.6063.72134.60119.7092.54127.00418.8427.6594.0531.2179.281.5326.8740.8260.4313.197.2393.71188.092.5279.1236.6632.7421.0251.7391.6267.8763.5543.7469.295.1401.3383.6418.3502.0269.5740.1318.487.1117.1520.5242.0110.6108.0136.0239.71630.0901.4463.355.6952.8241.9027.7716.6940.5564.0750.1928.7435.8653.7275.0142.3042.0759.7820.9321.8933.6538.9220.2298.1563.8239.3120.4138.6056.5170.3166.1960.8325.2335.6226.3934.9734.4468.0134.9827.5226.2117.8731.2928.3041.9831.580.010.010.020.020.050.010.010.010.020.020.010.010.020.010.010.020.020.030.010.020.010.010.020.010.010.010.010.020.020.020.020.020.010.010.010.010.010.010.010.010.010.010.01495.161219.801166.59651.42345.43144.07332.271139.92500.04522.42192.78611.34753.26117.13772.85282.83368.94631.35340.45270.77915.19452.32627.67360.97273.40624.701109.531219.791085.70343.72613.92484.32161.36413.80440.19465.25671.50686.12211.01370.701040.64562.95557.59130.02180.75299.96333.61629.8674.87130.11262.89257.11278.3194.39139.50370.5482.80139.31272.88249.79390.82153.61176.20147.93118.29253.86111.7264.00125.11230.94303.79386.68212.08280.16219.6097.53149.91160.99161.02163.09153.9773.47121.97216.18203.03184.95续表1序号工程号样号岩性名称检测结果/(g/g)LiGaRbSrNbReLREEHREE16452023 年矿产勘查161718192021222324ZK23112ZK2328ZK3104ZK40112ZK55112ZK1600ZK6452ZK4456ZK32508123412312345671231231234123451234567891011121铁矾土铁矾土铝土矿铁矾土页岩铝土矿铁矾土页岩铝土矿铁矾土页岩铁矾土页岩铁矾土页岩铁矾土铝土矿页岩黏土页岩铝土矿页岩黏土页岩铝土矿铁矾土页岩黏土矿铝土矿菱铁页岩铁矾土菱铁页岩石盒子组砂质泥岩石盒子组泥岩石盒子组泥岩石盒子组泥岩石盒子组页岩石盒子组泥岩石盒子组泥岩石盒子组泥岩石盒子组泥岩石盒子组泥岩山西组泥岩铝土矿石盒子组泥岩72.21524.01528.0576.687.62358.01399.0488.02296.01552.0458.0412.5438.0719.774.02263.0197.5305.9224.4767.2208.2180.3706.8564.4396.1952.6649.3665.0471.31001.027.351.957.442.025.527.653.375.679.6155.2127.4257.930.320.6229.2914.4325.2618.7015.7915.2015.6115.6520.9221.2923.8121.2615.8721.0015.0714.9519.5024.9819.5123.2622.2128.5622.4924.6634.2712.7824.5129.2622.2914.5416.9416.8914.6012.7612.2214.4116.7617.5116.9518.7919.8914.22354.8017.898.7932.14208.20112.4091.35116.2047.9495.01183.20273.90223.20194.30324.8034.4637.20137.80117.1017.36212.20104.809.8819.9372.4141.5741.55104.30174.20152.1072.8159.7357.5129.4060.6072.6628.8073.71160.8143.00124.20123.0084.87169.4125.6378.1183.31480.0204.6229.3139.2323.0218.0223.6383.2299.3333.5524.2126.8600.1825.4119.2172.2234.974.5158.9189.9336.972.2478.2278.1488.8413.362.050.051.437.158.966.851.756.1103.673.486.084.750.220.2554.2458.4449.4224.5343.1224.6920.8550.2741.7331.5734.4832.8938.7026.1523.5086.0047.4029.4650.7032.6723.8571.7757.5240.3844.2349.3343.6351.9049.7714.9817.7517.5115.9015.6614.6920.4019.5719.9613.9722.5520.0614.920.010.010.010.010.020.010.010.010.010.010.010.010.010.010.010.010.020.030.010.010.020.030.020.020.040.010.010.020.040.020.010.010.010.020.010.010.010.120.020.010.010.010.01661.14172.9158.15538.62616.78189.82471.39397.35352.17506.68583.81580.05497.97401.82558.41430.751432.611274.34149.63182.13845.36262.80480.92920.99944.37122.30859.31855.071135.361143.58466.60113.47107.88113.79267.73552.68206.38117.64280.84370.04351.99342.46213.26192.3982.5178.29145.63290.43174.23127.46141.29140.09189.15205.99188.64186.46128.45212.01118.79228.50370.5189.88117.26159.5785.74104.76131.96449.7676.30187.13183.92585.59276.3562.0516.8015.0917.4526.5772.8432.8627.3933.7435.7334.4036.9627.19续表1序号工程号样号岩性名称检测结果/(g/g)LiGaRbSrNbReLREEHREE1646第 14 卷 第 9 期 董化祥等：曹窑以西煤下铝土矿整装勘项目伴生轻稀土、锂、镓矿产分布特征及资源潜力23456789101112131415161718192021222324石盒子组泥岩石盒子组页岩石盒子组泥岩石盒子组泥岩石盒子组砂质泥岩石盒子组泥岩石盒子组泥岩石盒子组泥岩石盒子组泥岩石盒子组泥岩石盒子组泥岩石盒子组泥岩石盒子组泥岩石盒子组泥岩石盒子组泥岩石盒子组砂质泥岩石盒子组砂质页岩石盒子组砂质泥岩石盒子组砂质泥岩石盒子组泥岩石盒子组砂质泥岩石盒子组炭质泥岩铝土矿30.630.726.370.563.358.152.733.757.6157.9104.164.249.351.044.785.5120.065.4213.7150.3114.0110.1122.916.4117.1815.9116.6418.9517.4716.2516.6516.5325.7023.4317.7816.1117.1815.4017.6821.0718.1218.7119.0218.1720.9019.8544.2558.8760.1253.9585.4184.3977.93115.4066.0611.2622.1681.60103.0089.24118.00112.00152.20145.40107.60157.40140.10200.70160.8044.660.551.541.576.6101.183.9121.5133.588.398.5271.8144.2173.7133.9125.2148.7135.7189.4192.0158.3183.3197.215.6715.6516.0614.9120.3820.2216.6615.8117.2736.9421.1619.6519.9218.8018.9119.8720.8820.5412.8921.4918.6621.7119.340.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.01113.14259.61168.6652.87271.81332.4654.2280.19268.7854.17144.41685.03302.12429.56343.89323.14295.45393.67415.26195.19258.84259.74296.4016.5228.2619.628.9634.5435.8610.9010.5626.8614.5911.8780.1335.0048.1353.5433.2534.6340.4544.6821.3428.5730.4139.49续表1序号工程号样号岩性名称检测结果/(g/g)LiGaRbSrNbReLREEHREE3讨论3.1“三稀”元素赋存状态研究镓（Ga）为铝土矿的伴生元素，主要以类质同象形式赋存于铝土矿中，与矿石中硬水铝石，特别是结晶柱状一水硬铝石的含量有一定关系。锂（Li）在表生条件下有较大的活动性，一部分易形成易溶盐被流水带走，另有相当部分滞留于风化壳中的黏土矿物。其中锂（Li）含量普遍较高，这与风化母岩中含有蒸发盐有关。前人研究表明铝土矿中锂主要以离子吸附的形式赋存在黏土矿物及铁锰氧化物表面，或以类质同象的形式进入镁铁硅酸岩矿物、黏土矿物及铁锰矿物晶格中（王登红等，2013；范宏鹏等，2021）。一般认为稀土（REE）主要以两种形式存在：以离子状态吸附在硬水铝石、三水铝石、高岭石等黏土矿物表面；以类质同象代换存在于硬水铝石、三水铝石等主要矿物中（金中国等，2019）。3.2“三稀”与铝土矿品位关系曹窑以西煤下铝矿区铝土矿中普遍存在稀土矿化，LREE已达到工业利用指标。需要指出的是，离子吸附型稀土矿床的边界品位均是以稀土元素作为单一矿化元素而设立的，没有考虑到稀土元素作为有益伴生元素的情形，在铝土矿-稀土元素-稀有金属综合回收的工艺流程内，LREE 的边界品位 应 当 低 于 50010-6。REE 品 位 在 Al2O3含 量36.84%72.52%之间较均匀，随Al2O3含量的增高有降低的趋势（图2），指示渑池县曹窑以西铝土矿矿区具有较大的LREE找矿潜力，同时，应对铝土矿伴生LREE综合利用指标进行研究。Ga 元素含量最高 0.0120%，最低 0.0010%，平均含量为0.0041%。其中有146个样品镓的含量大于0.0020%，达到综合利用指标。王莉等（2017）认16472023 年矿产勘查为汝州宝丰鲁山铝土矿成矿区带的铝土矿及铝质黏土岩都具有明显的Ga矿化，且铝质黏土岩中的Ga含量高于铝土矿，曹窑以西煤下铝土矿区Ga也存在相似特征，本区本溪组内普遍存在Ga元素矿化，分布较均匀，且黏土岩、铁矾土中Ga平均含量高于铝土矿中的Ga平均含量（表2），这表明本区黏土岩和铁矾土显示了 Ga 矿化线索。铝土矿样品的Al2O3与Ga元素含量协变关系也有规律可循，呈正相关关系，这说明随着Al2O3含量的上升，Ga含量也呈总体上升趋势（图2）。锂（Li）在铝土矿形成过程中相当大一部分滞留在铝黏土矿物中（贠孟超等，2017），主要残留在铝土岩的含矿岩系中，含炭岩石中含量较高（表 2）。本区锂元素品位最高0.2358%，最低0.0025%，平均品位为 0.0699%，其中 ZK2328、ZK3104 铝土矿中Li2O达到综合利用指标（表1、表2），资源潜力较大。由表1、表2可知：本溪组铝土矿、菱铁矿、黏土矿、铁矾土中镓含量较高；铝土矿、铁矾土中锂、轻稀土含量较高，可为今后勘查工作提供线索。3.3“三稀”与铝土矿厚度关系通过对五门沟矿段铝土矿矿体等厚线图与铝土矿伴生“三稀”元素地球化学图（图3）对比分析，可知Ga沿铝土矿矿体走向呈带状分布，倾向关系不明显，与矿体厚度关系不明显；LREE与铝土矿矿体厚度相关，即铝土矿矿体越厚，轻稀土越富集；锂与铝土矿厚度无明显关系。3.4“三稀”与铝土矿埋深关系通过对五门沟矿段横07勘探线剖面、关底沃横12勘探线剖面、黄漫矿段横44勘探线剖面及Li、Ga、LREE化验结果对比得出：在埋深较浅的铝土矿中和埋深较大的铝土矿中含量变化不大，“三稀”元素富集程度与铝土矿埋深关系不明显（图4）。只在五门沟矿段横07勘探线剖面看出随着埋深的增加锂元素品位有下降的趋势黄漫矿段横44勘探线剖面看出随着埋深的增加LREE有下降的趋势。图2铝土矿伴生LREE、Li、Ga、TiO2与Al2O3相关性图解aLREE与Al2O3相关性图解；bLI与Al2O3相关性图解；cGa与Al2O3相关性图解；dTiO2与Al2O3相关性图解1648第 14 卷 第 9 期 董化祥等：曹窑以西煤下铝土矿整装勘项目伴生轻稀土、锂、镓矿产分布特征及资源潜力3.5“三稀”分布规律对钻孔HZK3250、HZK4456二叠系岩层分段取样（图5）分析可知：“三稀”元素主要与本溪组铝土矿、黏土矿等相关，在本溪组中含量较高，在二叠系含量较低。Li、Ga在本溪组中的含量高于二叠系的含量，LREE除了在本溪组中含量较高以外，在二叠系部分地层中的含量也相对较高。3.6“三稀”前景分析在主矿种铝土矿资源储量估算的基础上，对区内五门沟、柴洼、关底沃扣门山、黄漫4个矿段共12个区域26个矿体伴生“三稀”矿产进行初步资源量估算。其中稀土（离子吸附型）边界品位为：轻稀土0.05%；镓（Ga）0.002%；氧化锂（Li2O）0.05%。因Ga、Li2O、轻稀土在铝土矿中的赋存条件类似，故表2曹窑煤下铝土矿本溪组不同岩性“三稀”平均含量（g/g）本溪组岩性赤铁矿黄铁页岩菱铁矿菱铁页岩铝土矿炭质页岩铁矾土铁质页岩黏土矿黏土矿(上)黏土矿(下)黏土岩黏土页岩Li213.03276.00278.70449.83822.76239.401008.61293.90724.40628.86594.65341.30499.00Ga12.4122.2314.3920.9316.0322.0822.0923.2318.5227.9421.9915.5923.29LREE367.77484.32450.75679.97579.99244.87634.43631.351234.37343.891152.75211.01220.19HREE337.60219.60191.10222.51162.1895.70207.36390.822