201和361铀矿床中绿泥石的特征及其形成环境研究_张展适

收稿日期:2006-05-10基金项目:国家自然科学基金项目(批准号:40642010;40472147);文章编号:1000-4734(2007)02-0161-12201和361铀矿床中绿泥石的特征及其形成环境研究张展适1,2,华仁民2,季峻峰2,张彦春3,郭国林1,尹征平3(1.核资源与环境教育部重点实验室(东华理工学院),地球科学系,江西南昌,330013;2.南京大学地球科学系成矿作用研究国家重点实验室江苏南京210093;3.核工业华南地质局二九o 研究所广东韶关512026)摘要:绿泥石化是201和361铀矿床最重要的蚀变类型之一。

本文在岩石薄片观察的基础上,采用电子探针分析技术研究了绿泥石的共生组合与形貌特征,测定了87个代表性绿泥石的化学成分,并据此划分了绿泥石的化学类型,计算了绿泥石的形成温度、n (Al)/n (Al+Mg+Fe)值等相关指数,讨论了绿泥石的形成机制及其与铀成矿的关系。

研究表明:¹岩石中绿泥石主要呈脉状、黑云母假象或团块状等产出,具有蠕虫状、叶片状等形貌特征;º绿泥石的Fe/Si 图解显示201和361铀矿床中绿泥石主要为铁镁绿泥石和蠕绿泥石,少数属密绿泥石;»根据Battaglia 提出的经验方程式计算了201和361铀矿床绿泥石的形成温度变化于179~276e 之间,且主要介于230~260e 之间;¼绿泥石主要形成于还原环境,其主要的形成机制是溶解-沉淀和溶解-迁移-沉淀。

关键词:绿泥石;形成温度;溶解-沉淀;溶解-迁移-沉淀;201铀矿床;361铀矿床中图分类号:P594;P619 文献标识码:A作者简介:张展适,女,1965年生,博士,教授,主要从事矿床学、地球化学方面的教学与研究工作.绿泥石是热液蚀变、中-低温变质作用、成岩作用和铜、金、铀等矿床成矿热液蚀变过程中的常见矿物[1-2],绿泥石作为中低温、中低压环境中稳定存在的矿物,由于其结构有很大的可变性,成分上具有非计量性,因此众多学者十分重视绿泥石化学成分及其与形成的物理化学条件、共生矿物组合、主岩成分及绿泥石的结构等方面的关系的研究,并建立了一系列的定量研究模型[3-10],如Mac Dowell 和Elders [3],Jahren 和Aagaard [4]发现随着成岩和地热系统的深度增加,绿泥石中的Si (Ô)减少且Al(Ô)增加;Cathelineau 和Nieva [5],Ca thelineau [6]通过研究墨西哥Los Azufres 和Salton Sea 地热系统绿泥石的成分-温度之间的关系,发现绿泥石中的(Al Ô)和温度之间存在正相关关系,并提出了绿泥石固溶体地质温度计;Kranidio -tis 和MacLean [7]及Bevins 等[8]的研究表明绿泥石和其主岩的FeO/(FeO+MgO)含量之间存在线性正相关关系;Bryndzia 和Steven [9]通过实验研究得出了绿泥石的化学成分与其形成的氧逸度和硫逸度之间的关系;Battaglia [10]应用XRD 结果计算了绿泥石形成时的温度。

绿泥石的形成温度与绿泥石的结构、化学组成及多型等之间的关系已得到较为深入的研究,正在得到越来越广泛的认同。

国内对于矿床热液蚀变过程中粘土矿物的形成条件的研究刚处于起步阶段,仅华仁民等[11]和李晓峰等[12]对金山金矿和银山多金属矿床的热液蚀变矿物绿泥石和伊利石进行过专门的研究。

绿泥石化是铀成矿作用前和成矿作用过程中的一种重要的蚀变类型[13-15]。

201和361两个铀矿床同属百顺矿田,是分布在诸广岩体南部的我国最富的花岗岩型铀矿床,前人研究表明矿区范围内的花岗质岩石均广泛发育了各种类型的蚀变作用,主要有微斜长石化、钠长石化、白云母化和绿泥石化等,其中绿泥石化既可产在由微斜长石化、钠长石化及白云母化构成的碱交代岩内,同时还在碱交代岩旁侧形成独立且宽广(在201矿床达百米以上)的绿泥石化带,矿体就产在碱交代与绿泥石化岩石的过渡带部位偏绿泥石化带中[16-18]。

前人对本区蚀变岩石的研究主第27卷 第2期2007年6月矿 物 学 报ACTA MINERALOGICA SINIC AVol.27,No 12Jun 1,2007的分带上[16,18],而对热液蚀变作用中生成的绿泥石的化学成分及其形成条件等未做研究,本文系统采集了201和361两个铀矿床中不同产状和成因的绿泥石化岩石样品,在岩石薄片观察的基础上,采用电子探针分析技术研究了绿泥石化花岗质岩石和矿石中绿泥石的化学成分和结构特征,计算了绿泥石形成的温度等,最后根据绿泥石的产状、化学成分特点、形成的物理化学条件及裂变径迹特征等讨论了绿泥石在铀成矿作用过程中的作用。

1样品采集和分析方法本文采集了201矿床和361矿床中不同产状和成因的代表性绿泥石化花岗质岩石和矿山样品17件,样品的性质及采集位置见表1。

表1201和361铀矿床绿泥石样品的采集位置与性质Table1.Locali ties and characters of chlorite samples from Nos.201and360uraniu m deposi ts样号采样位置岩石性质及描述样号采样位置岩石性质及描述ZG05361铀矿床沥青铀矿矿脉ZG13-1201铀矿床团块状绿泥石化花岗岩ZG06单脉带绿泥石花岗岩ZG13-2近构造绿泥石化碎裂岩ZG07星点状绿泥石化花岗岩ZG14绿泥石化花岗岩ZG08角砾岩中绿泥石化花岗岩ZG15绿泥石化花岗岩ZG09绿泥石化粗粒花岗岩ZG16绿泥石矿脉ZG10绿泥石化细粒花岗岩ZG17矿脉上方绿泥石化花岗岩ZG11-1细粒花岗岩ZG18绿泥石化花岗岩ZG11-2被辉绿岩切穿的细粒花岗岩ZG11-3辉绿岩中花岗岩残留体ZG12伊利石化岩石绿泥石的化学成分分析在东华理工学院核资源与环境教育部重点实验室进行,采用日本JEOX JXA-8100型电子探针仪测定,测试条件为:加速电压15kV,电流1@10-8A。

所使用的标样为国家标准局(GB/T15617-95)的矿物标样,其中Na 选用硬玉,K为透长石,Mg选方镁石,Al选斜长石,Si选石英,Ti选金红石,Fe采用赤铁矿,Mn选用蔷薇辉石,Cr采用氧化铬,Ca为萤石。

所有绿泥石颗粒的电子探针分析结果以28个氧原子为标准计算绿泥石的结构式,由于电子探针不能检测Fe3+,因此在绿泥石的结构计算中,把铁离子当作Fe2+来看待。

由于矿物的衬里、包裹体、混层结构和复杂的共生关系都能使标准的电子探针技术分析绿泥石成分时产生误差,因此对于绿泥石的电子探针成分结果,采用w(Na2O+K2O+ Ca O)<015%作为标准来判断是否合乎需要,如果w(Na2O+K2O+Ca O)>0.5%,则表明绿泥石的成分有混染[19-20]。

2研究结果与讨论2.1岩石中绿泥石的分布对采集的样品磨制了岩石薄片和电子探针片,详细的显微观察结果表明岩石中绿泥石主要有四种产状:(1)与沥青铀矿紧密共生的绿泥石,这种产状的绿泥石既可产在各种矿脉中,如在石英-沥青铀矿脉中,绿泥石与沥青铀矿、黄铁矿、闪锌矿及长石和石英等共生(图1A),也可在碎裂花岗岩中以绿泥石与沥青铀矿、铀石、锆石、磷灰石及含稀土矿物共生的方式产出。

(2)呈脉状分布的绿泥石,脉中的绿泥石有蠕虫状和叶片状两种形态,甚至在同一视域内能见到两种产状的绿泥石(图1B),其中蠕虫状绿泥石常与萤石相伴生。

(3)由长石蚀变而来的绿泥石,与长石紧密相关,一般颗粒较小和破碎(见图1C)。

(4)由黑云母蚀变而成的绿泥石,在岩石中分布最广,常部分或全部交代了黑云母,并保持黑云母的假象(见图1D),有些由黑云母蚀变而来的绿泥石在后期的流体作用过程中还产生了一些微小的流动变形现象。

绿泥石在电子探针下常可呈现两种不同的光性和形貌,其中的一种表面粗糙,光性稍暗,常被另一种表面干净,形貌完整的叶片状绿泥石交代和切穿。

162矿物学报2007年A.ZG-05号样品沥青铀矿矿脉中绿泥石与沥青铀矿、黄铁矿、闪锌矿、石英、长石等共生B.ZG-17号样品中发育有叶片状和蠕虫状两种形貌的绿泥石,其中蠕虫状绿泥石产在萤石脉中,与萤石共生;叶片状绿泥石主要由黑云母蚀变而成C.ZG-16号样品中与伊利石、斜长石共生的绿泥石D.ZG-07号样品由黑云母蚀变形成的绿泥石,保持了黑云母的假象,包含磷灰石及含稀土矿物,绿泥石可呈现不同的光性,其中的一种(Ch-l1)表面粗糙,光性稍暗,常被另一种(Ch-l2)表面干净,形貌完整的叶片状绿泥石交代和切穿,说明前者形成较早,后者由于铁的含量略高而呈现光性上的区别,但其化学分类均属铁镁绿泥石图1201和361铀矿床中绿泥石的形貌特征及共生组合Fig. 1.Configuration and paragenetic association of chlori te from Nos.201and361uranium deposits.2.2绿泥石的化学成分及其分类对上述不同产状的绿泥石进行了电子探针化学成分分析(表2),结果显示,w(SiO2)变化于28.81~22.2%之间,平均为25.27%;w(Al2O3)变化于22.38%~15.79%之间,平均为19179%;w(FeO)变化于39.74%~26.18%之间,平均为33.71%;w(MgO)变化于15.45%~ 3147%,平均为7.58%。

总体看镁和铁的含量变化最大。

绿泥石的Fe/Si图解常被用来作绿泥石的分类和命名[1],图2A是361铀矿床不同产状绿泥石的分类图解,该图表明361铀矿床中绿泥石不论其成因和产状,主要为蠕绿泥石和铁镁绿泥石,仅个别受辉绿岩脉切割的花岗岩中脉状绿泥石属密绿泥石(其原因可能是较花岗岩更富镁的辉绿岩中有部分镁质进入了绿泥石结构的缘故);图2B 是201铀矿床不同产状绿泥石的分类图解,与361铀矿床一样,201铀矿床中的绿泥石只有蠕绿泥石和铁镁绿泥石两类。

163第2期张展适等:201和361铀矿床中绿泥石的特征及其形成环境研究图2 361和201铀矿床绿泥石的分类图解(底图据Deer 等[1])Fig. 2.Classi fication of chlori te in Nos.361and 201uranium deposits.表2 201和361铀矿床中绿泥石的电子探针分析结果和特征值T able 2.Electron microprobe analyses of chlorite in Nos.201and 361uranium deposits产状类型样品w B /%Si O 2TiO 2Al 2O 3CrO FeO MnO MgO CaO Na 2O K 2O ÑZ G -05-124.670.0217.300.1039.79 1.08 2.510.020.060.04Z G -05-224.290.0916.970.0139.110.86 2.590.010.000.16Z G -05-324.480.0417.740.0839.19 1.08 2.670.070.010.10ÒZG06-1-123.630.1621.000.0036.570.61 5.310.080.060.02ZG06-1-223.510.0621.190.0036.270.59 5.400.070.080.00ZG06-1-323.350.1121.220.0036.420.54 5.240.050.060.01ZG06-1-423.040.1019.290.0039.180.48 4.630.050.000.01ZG06-3-124.220.2321.350.0034.740.50 5.160.070.020.54ZG06-3-224.770.1820.470.0032.700.54 4.650.050.10 1.35ZG06-3-325.190.1320.380.0033.970.52 4.920.010.070.52Ó-1ZG06-2-124.460.0819.000.0037.710.44 4.110.820.360.19ZG06-2-223.470.0219.960.0039.740.48 4.390.160.030.07ZG06-2-322.610.0318.390.0038.290.41 4.280.780.300.14ZG06-2-423.670.0019.450.0038.210.31 4.200.640.220.06ÔZG07-1-124.280.1018.990.0039.470.80 4.030.070.000.02ZG07-1-222.200.0422.380.0035.87 1.00 4.700.050.040.00ZG07-1-323.920.1120.670.0035.960.84 4.680.060.000.01ZG07-1-424.210.0620.930.0036.990.90 4.220.030.010.03ZG07-1-523.770.0720.920.0036.130.84 4.860.080.010.03ÒZG07-2-125.370.0021.340.0035.830.91 5.030.040.010.03ZG07-2-1023.940.0520.660.0036.370.87 4.850.040.070.00ZG07-2-1123.610.0221.480.0036.570.99 5.160.020.000.01ZG07-2-1222.600.0721.460.0036.800.88 4.830.040.010.00ZG07-2-223.600.0220.960.0036.450.87 4.830.070.030.00ZG07-2-323.760.0521.350.0036.140.96 4.960.080.000.10ZG07-2-425.280.0221.790.0035.830.93 4.440.030.000.37ZG07-2-523.650.0220.780.0036.790.94 4.580.040.000.02ZG07-2-624.580.0021.860.0034.340.78 4.700.010.040.41ZG07-2-724.270.0921.310.0036.180.79 4.680.060.000.02ZG07-2-824.550.2020.840.0038.020.92 5.120.020.060.05ZG07-2-924.140.0721.220.0036.370.914.830.040.020.09164矿 物 学 报 2007年续表2产状类型样品w B/%Si O 2TiO 2Al 2O 3CrO FeO MnO MgO CaO Na 2O K 2O ÓZG -08-1-124.750.0217.770.1137.31 2.84 3.470.070.050.05ZG -08-1-224.480.0017.050.1437.15 3.03 3.730.050.010.01ZG -08-1-324.290.0018.260.0237.71 3.15 3.470.000.000.04ZG -08-1-424.780.0018.430.1337.61 3.06 3.840.060.010.02ÒZG -10-1-123.890.1121.420.0335.000.81 4.550.000.010.14ZG -10-1-225.310.0220.250.1234.910.76 5.270.010.020.05ZG -10-1-326.400.0720.490.0934.380.72 5.660.040.040.05ZG -10-2-124.990.1220.600.1133.940.85 5.700.020.080.04ZG -10-2-224.850.0220.450.1433.970.83 4.830.150.270.08Ó-2ZG -11-1-126.040.0419.810.0332.690.479.410.000.070.01ZG -11-1-225.150.0318.400.0432.790.398.830.090.120.03ZG -11-1-324.780.0419.400.0632.510.469.180.030.050.00ZG -11-1-426.630.0018.400.0932.810.369.290.040.100.07ZG -11-1-526.240.1317.500.1135.860.448.600.010.000.01ZG -11-1-626.890.0515.790.0935.370.457.880.010.060.03ZG -11-1-727.510.0017.190.1533.870.339.210.050.090.03ÓZG -11-1-825.240.0219.620.0932.390.438.790.050.070.03ÔZG -11-3-128.810.0317.340.1026.180.2315.450.130.050.06ÒZG -13-1-126.860.0819.260.0330.630.3210.140.060.010.00ZG -13-1-227.060.5219.500.1531.560.418.870.180.050.05ZG -13-1-327.050.1218.640.0031.960.349.740.060.040.02ZG -13-1-2-127.070.1518.830.0132.030.299.170.150.020.05ZG -13-1-2-226.770.0918.820.0631.790.299.610.070.000.02Ó-2ZG -13-2-1-126.290.0018.810.0231.610.309.460.040.000.03ZG -13-2-1-226.620.0519.490.0330.430.3510.640.040.000.00ZG -13-2-1-326.410.0219.110.0131.260.4110.170.030.020.00ÒZG -13-2-2-126.030.2319.360.0930.420.3410.310.100.000.06ZG -13-2-2-226.420.0419.420.0530.420.3510.040.080.070.06ZG -13-2-2-326.690.0519.660.0130.710.3110.680.040.000.02ZG -14-1-127.080.1318.900.1231.020.2210.610.050.000.09ZG -14-1-225.830.1419.470.0731.090.3610.810.050.040.12ZG -14-1-326.680.1019.750.0231.540.3410.390.020.090.00ZG -14-1-426.860.0819.420.0730.860.3010.650.090.030.05Ó-2ZG -14-2-126.600.0318.930.0231.690.2610.380.040.060.02ZG -14-2-227.100.0019.630.0231.710.329.640.030.040.13ZG -14-2-325.940.0118.550.0731.930.329.770.030.070.04Ó-2ZG -15-1-125.040.0220.870.1830.400.369.920.510.020.00ZG -15-1-226.010.0320.310.0832.060.459.890.040.040.00ZG -15-1-326.350.1020.240.1031.790.419.620.040.020.01ÔZG -15-2-124.570.0419.930.0331.440.429.470.040.020.02ZG -15-2-226.230.0719.740.0332.050.4410.750.000.010.02ÔZG -16-1-125.800.0919.700.0930.370.559.070.040.000.12ZG -16-1-225.510.0019.110.1232.260.377.710.050.000.06ZG -16-1-327.170.0021.660.0831.000.458.400.050.000.24ÒZG -16-2-125.220.0620.350.0732.500.509.160.000.000.00ZG -16-2-225.440.0020.580.0532.670.608.180.040.000.00ÔZG -17-1-125.010.0019.770.0931.920.439.850.000.080.05Ó-1ZG -17-1-225.370.0219.340.0932.100.559.370.100.100.07ZG -17-1-325.330.1019.880.0731.830.5310.090.020.120.11ZG -17-1-524.780.0519.980.0432.690.499.470.040.010.03Ó-2ZG -17-1-424.830.0520.830.0532.250.518.930.040.050.02Ò-1Z G -18-124.430.0520.130.0031.580.459.750.010.030.00Z G -18-226.500.0420.090.0932.120.5410.230.070.060.01Z G -18-326.650.0018.600.1531.700.569.830.050.170.03Z G -18-426.200.3519.120.0631.120.449.940.070.150.09165第2期张展适等:201和361铀矿床中绿泥石的特征及其形成环境研究166矿物学报2007年续表2n B产状类型样品Si AlÔAlÖTi FeÒCr Mn Mg Ca Na K ÑZG-05-1 5.85 2.15 2.680.007.890.020.220.890.010.030.01 ZG-05-2 5.86 2.14 2.670.027.890.000.180.930.000.000.05ZG-05-3 5.80 2.21 2.740.017.760.020.220.940.020.010.03ÒZG06-1-1 5.35 2.66 2.940.03 6.920.000.12 1.790.020.020.01 ZG06-1-2 5.33 2.68 2.980.01 6.870.000.11 1.820.020.030.00 ZG06-1-3 5.31 2.69 2.980.02 6.920.000.11 1.780.010.030.00 ZG06-1-4 5.35 2.65 2.630.027.620.000.10 1.610.010.000.00 ZG06-3-1 5.61 2.39 2.750.017.240.000.09 1.410.200.160.06 ZG06-3-2 5.36 2.64 2.720.007.590.000.09 1.490.040.010.02 ZG06-3-3 5.38 2.62 2.530.017.620.000.08 1.520.200.140.04Ó-1ZG06-2-1 5.47 2.53 2.770.007.390.000.06 1.450.160.100.02 ZG06-2-2 5.46 2.54 3.130.04 6.550.000.10 1.740.020.010.16 ZG06-2-3 5.70 2.30 3.240.03 6.290.000.11 1.590.010.040.40 ZG06-2-4 5.72 2.28 3.180.02 6.460.000.10 1.670.000.030.15ÔZG07-1-1 5.57 2.43 2.700.027.570.000.16 1.380.020.000.01 ZG07-1-2 5.10 2.90 3.150.01 6.890.000.19 1.610.010.020.00 ZG07-1-3 5.47 2.53 3.040.02 6.880.000.16 1.600.020.000.00 ZG07-1-4 5.49 2.51 3.070.017.010.000.17 1.430.010.000.01 ZG07-1-5 5.41 2.59 3.030.01 6.880.000.16 1.650.020.010.01ÒZG07-2-1 5.60 2.40 3.160.00 6.620.000.17 1.660.010.000.01 ZG07-2-10 5.45 2.55 2.990.01 6.930.000.17 1.650.010.030.00 ZG07-2-11 5.32 2.69 3.010.00 6.890.000.19 1.730.000.000.00 ZG07-2-12 5.19 2.81 2.990.017.060.000.17 1.650.010.010.00 ZG07-2-2 5.38 2.62 3.010.00 6.950.000.17 1.640.020.020.00 ZG07-2-3 5.37 2.63 3.050.01 6.830.000.18 1.670.020.000.03 ZG07-2-4 5.58 2.42 3.250.00 6.620.000.18 1.460.010.000.11 ZG07-2-5 5.41 2.59 3.000.007.030.000.18 1.560.010.000.01 ZG07-2-6 5.53 2.47 3.320.00 6.460.000.15 1.580.000.020.12 ZG07-2-7 5.47 2.54 3.120.02 6.810.000.15 1.570.020.000.01 ZG07-2-8 5.43 2.57 2.860.037.030.000.17 1.690.010.030.01 ZG07-2-9 5.48 2.52 2.960.03 6.940.000.20 1.600.010.000.01ÓZG-08-1-1 5.77 2.23 2.660.007.280.020.56 1.210.020.020.02 ZG-08-1-2 5.78 2.22 2.530.007.340.030.61 1.310.010.010.00 ZG-08-1-3 5.65 2.35 2.660.007.340.000.62 1.200.000.000.01 ZG-08-1-4 5.68 2.32 2.650.007.210.020.59 1.310.020.010.01ÒZG-10-1-1 5.45 2.55 3.210.02 6.680.010.16 1.550.000.000.04 ZG-10-1-2 5.70 2.30 3.070.00 6.570.020.14 1.770.000.010.02 ZG-10-1-3 5.81 2.19 3.130.01 6.330.020.13 1.860.010.020.01 ZG-10-2-1 5.62 2.38 3.080.02 6.390.020.16 1.910.000.040.01 ZG-10-2-2 5.66 2.34 3.150.00 6.480.030.16 1.640.040.120.02Ó-2ZG-11-1-1 5.65 2.35 2.710.01 5.930.010.09 3.040.000.030.00 ZG-11-1-2 5.68 2.32 2.570.01 6.190.010.07 2.970.020.050.01 ZG-11-1-3 5.54 2.47 2.640.01 6.080.010.09 3.060.010.020.00 ZG-11-1-4 5.84 2.16 2.590.00 6.020.020.07 3.040.010.040.02 ZG-11-1-5 5.79 2.21 2.330.02 6.620.020.08 2.830.000.000.00 ZG-11-1-6 6.09 1.91 2.300.01 6.700.020.09 2.660.000.030.01 ZG-11-1-7 6.01 1.99 2.440.00 6.190.030.06 3.000.010.040.01ÓZG-11-1-8 5.61 2.39 2.740.00 6.020.020.08 2.910.010.030.01ÔZG-11-3-1 6.03 1.97 2.300.00 4.580.020.04 4.820.030.020.02ÒZG-13-1-1 5.83 2.17 2.750.01 5.560.010.06 3.280.010.010.00 ZG-13-1-2 5.84 2.16 2.790.08 5.690.030.08 2.850.040.020.02 ZG-13-1-3 5.88 2.12 2.650.02 5.810.000.06 3.150.010.020.01 ZG-13-1-2-1 5.90 2.10 2.720.03 5.830.000.05 2.980.040.010.01续表2n B 产状类型样品Si Al ÔAl ÖTi Fe ÒCr Mn Mg Ca Na K Ó-2ZG -13-2-1-1 5.81 2.19 2.700.00 5.840.000.06 3.120.010.000.01ZG -13-2-1-2 5.76 2.24 2.720.01 5.500.010.06 3.430.010.000.00ZG -13-2-1-35.76 2.24 2.670.00 5.700.000.08 3.310.010.010.00ÒZG -13-2-2-1 5.70 2.31 2.680.04 5.570.020.06 3.360.020.000.02ZG -13-2-2-2 5.77 2.23 2.770.01 5.560.010.06 3.270.020.030.02ZG -13-2-2-3 5.74 2.26 2.720.01 5.530.000.06 3.430.010.000.00ZG -14-1-1 5.83 2.17 2.630.02 5.590.020.04 3.410.010.000.03ZG -14-1-2 5.61 2.39 2.580.02 5.650.010.07 3.500.010.020.03ZG -14-1-3 5.72 2.29 2.700.02 5.650.000.06 3.320.010.040.00ZG -14-1-45.77 2.23 2.680.01 5.540.010.06 3.410.020.010.01Ó-2ZG -14-2-1 5.77 2.23 2.610.01 5.750.000.05 3.360.010.030.01ZG -14-2-2 5.832.17 2.800.00 5.700.000.063.090.010.020.04ZG -14-2-35.75 2.26 2.580.00 5.910.010.06 3.230.010.030.01Ó-2ZG -15-1-1 5.47 2.54 2.830.00 5.550.030.07 3.230.120.010.00ZG -15-1-2 5.60 2.40 2.750.01 5.770.010.08 3.170.010.020.00ZG -15-1-35.67 2.33 2.800.02 5.720.020.07 3.090.010.010.00ÔZG -15-2-1 5.49 2.51 2.730.01 5.880.010.08 3.150.010.010.01ZG -15-2-2 5.62 2.38 2.600.01 5.740.000.08 3.430.000.000.01ÔZG -16-1-1 5.73 2.27 2.880.01 5.640.020.10 3.000.010.000.03ZG -16-1-2 5.77 2.23 2.860.00 6.100.020.07 2.600.010.000.02ZG -16-1-35.77 2.23 3.200.00 5.510.010.08 2.660.010.000.06ÒZG -16-2-1 5.52 2.48 2.770.01 5.950.010.09 2.990.000.000.00ZG -16-2-2 5.59 2.41 2.920.006.010.010.11 2.680.010.000.00ÔZG -17-1-1 5.52 2.48 2.650.00 5.890.020.08 3.240.000.030.01Ó-1ZG -17-1-2 5.61 2.39 2.650.00 5.940.020.10 3.090.020.040.02ZG -17-1-3 5.53 2.47 2.630.02 5.810.010.10 3.280.010.050.03ZG -17-1-55.46 2.54 2.850.01 5.930.010.10 2.920.010.020.01Ó-2ZG -17-1-4 5.47 2.54 2.660.01 6.030.010.09 3.110.010.000.01Ò-1ZG -18-1 5.43 2.57 2.710.01 5.870.000.09 3.230.000.010.00ZG -18-2 5.65 2.35 2.690.01 5.720.010.10 3.250.020.020.00ZG -18-3 5.82 2.18 2.600.00 5.790.030.10 3.200.010.070.01ZG -18-45.722.28 2.630.06 5.680.010.08 3.230.020.060.03产状类型样品n (Fe)/n (Fe+Mg)n (Mg)/n (Fe+Mg)R 2+n (Al)/n (Al+Mg+Fe)d 001/nm t /e ÑZ G -05-10.900.109.000.35 1.414243Z G -05-20.890.118.990.35 1.414243Z G -05-30.890.118.930.36 1.413245ÒZG06-1-10.790.218.840.39 1.412262ZG06-1-20.790.218.820.39 1.412263ZG06-1-30.800.208.810.40 1.411264ZG06-1-40.830.179.330.36 1.411269ZG06-3-10.840.168.930.37 1.413250ZG06-3-20.840.169.210.37 1.411268ZG06-3-30.830.179.410.36 1.411267Ó-1ZG06-2-10.840.169.050.37 1.412260ZG06-2-20.790.218.400.41 1.413252ZG06-2-30.800.208.000.41 1.414236ZG06-2-40.790.218.220.40 1.414236ÔZG07-1-10.850.159.120.36 1.412256ZG07-1-20.810.198.700.42 1.410276ZG07-1-30.810.198.660.40 1.412255ZG07-1-40.830.178.610.40 1.412255ZG07-1-50.810.198.710.40 1.412258ÒZG07-2-10.800.208.450.40 1.413244167第2期张展适等:201和361铀矿床中绿泥石的特征及其形成环境研究168矿物学报2007年续表2产状类型样品n(Fe)/n(Fe+Mg)n(Mg)/n(Fe+Mg)R2+n(Al)/n(Al+Mg+Fe)d001/nm t/e ÒZG07-2-110.800.208.810.40 1.412264 ZG07-2-120.810.198.890.40 1.411273ZG07-2-20.810.198.780.40 1.412260ZG07-2-30.800.208.700.40 1.412260ZG07-2-40.820.188.260.41 1.413245ZG07-2-50.820.188.780.39 1.412260ZG07-2-60.800.208.190.42 1.413247ZG07-2-70.810.198.550.40 1.412254ZG07-2-80.810.198.900.38 1.412258ZG07-2-90.810.198.750.39 1.412254ÓZG-08-1-10.860.149.070.37 1.415233 ZG-08-1-20.850.159.270.35 1.414238ZG-08-1-30.860.149.170.37 1.416220ZG-08-1-40.850.159.130.37 1.415230ÒZG-10-1-10.810.198.380.41 1.419186 ZG-10-1-20.790.218.490.39 1.415225ZG-10-1-30.770.238.330.39 1.413245ZG-10-2-10.770.238.470.40 1.414240ZG-10-2-20.800.208.310.40 1.416223Ó-2ZG-11-1-10.660.349.060.36 1.414241 ZG-11-1-20.680.329.260.35 1.414241Ó-2ZG-11-1-30.670.339.230.36 1.414243 ZG-11-1-40.660.349.130.34 1.414243ZG-11-1-50.700.309.530.32 1.421169ZG-11-1-60.720.289.440.31 1.416218ZG-11-1-70.670.339.270.32 1.421169ÓZG-11-1-80.670.339.030.36 1.419187ÔZG-11-3-10.490.519.470.31 1.42176ÒZG-13-1-10.630.378.910.36 1.42179 ZG-13-1-20.670.338.660.37 1.413247ZG-13-1-30.650.359.040.35 1.412262ZG-13-1-2-10.660.348.900.35 1.411264ZG-13-1-2-20.650.359.000.35 1.419187Ó-2ZG-13-2-1-10.650.359.020.35 1.413250 ZG-13-2-1-20.620.389.010.36 1.411268ZG-13-2-1-30.630.379.090.35 1.411267ÒZG-13-2-2-10.620.389.020.36 1.412260 ZG-13-2-2-20.630.378.910.36 1.413252ZG-13-2-2-30.620.389.020.36 1.414236ÒZG-14-1-10.620.389.050.35 1.414236 ZG-14-1-20.620.389.220.35 1.414241ZG-14-1-30.630.379.030.36 1.414241ZG-14-1-40.620.389.030.35 1.413249Ó-2ZG-14-2-10.630.379.160.35 1.413246 ZG-14-2-20.650.358.850.36 1.413254ZG-14-2-30.650.359.210.35 1.414238Ó-2ZG-15-1-10.630.378.960.38 1.415229 ZG-15-1-20.650.359.040.37 1.414241ZG-15-1-30.650.358.890.37 1.414239ÔZG-15-2-10.650.359.120.37 1.414235 ZG-15-2-20.630.379.260.35 1.414236ÔZG-16-1-10.650.358.750.37 1.414243 ZG-16-1-20.700.308.780.37 1.415225ZG-16-1-30.670.338.260.40 1.415234续表2产状类型样品n(Fe)/n(Fe+Mg)n(Mg)/n(Fe+Mg)R2+n(Al)/n(Al+Mg+Fe)d001/nm t/e ÒZG-16-2-20.690.318.810.38 1.416216ÔZG-17-1-10.650.359.210.36 1.414238Ó-1ZG-17-1-20.660.349.150.36 1.418199 ZG-17-1-30.640.369.190.36 1.416221ZG-17-1-50.670.338.950.38 1.416221Ó-2ZG-17-1-40.660.349.240.36 1.416220Ò-1Z G-18-10.650.359.190.37 1.416222 Z G-18-20.640.369.090.36 1.416220Z G-18-30.640.369.100.35 1.415225Z G-18-40.640.369.010.36 1.415224注:绿泥石产状类型Ñ-产于沥青铀矿脉中绿泥石;Ò-黑云母或金云母(Ò-1)蚀变成绿泥石,前者常保持黑云母假象;Ó-脉状产出的绿泥石,Ó-1为蠕虫状,Ó-2为叶片状绿泥石;Ô-长石蚀变成绿泥石.2.3绿泥石的n(Mg)/n(Fe+Mg)与n(Al)/n(Al+Mg+Fe)值Laird[21]提出的n(Mg)/n(Fe+Mg)-n(Al)/ n(Al+Mg+Fe)关系图解被广泛地用于判断绿泥石与其母岩的关系。