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第一作者:吕川,男,1984年生,高级工程师,主要从事铀矿地质找矿勘查与研究。E-mail:lvc270@163.com |
收稿日期: 2025-02-04
修回日期: 2025-03-26
网络出版日期: 2025-10-24
基金资助
国家自然科学基金(42062006)
国家自然科学基金(42273028)
核资源与环境国家重点实验室开放基金(2020NRE08)
中国核工业地质局地勘项目(202231)
Petrography and geochemical characteristics of uranium-bearing granite in the east section of QFⅤ belt,Lujing uranium ore-field
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First author:LYU Chuan,male,born in 1984,senior engineer,focusing on uranium geological prospecting exploration and research. E-mail:lvc270@163.com |
Received date: 2025-02-04
Revised date: 2025-03-26
Online published: 2025-10-24
Supported by
National Natural Science Foundation(42062006)
National Natural Science Foundation(42273028)
Open Fund for State Key Laboratory of Nuclear Resources and Environment(2020NRE08)
Geological Exploration Project of China Nuclear Geology(202231)
鹿井铀矿田QFⅤ号矿带东段下古选地区产出硅质脉型铀矿化,赋矿围岩为中粗粒斑状黑云母花岗岩,近矿热液蚀变以赤铁矿化、硅化、绿泥石化和碳酸盐化为主。锆石U-Pb年代学、岩相学和岩石地球化学分析表明,该赋矿围岩锆石U-Pb谐和年龄为228.3 Ma和加权平均年龄为228.9 Ma,形成于印支期第2阶段(晚三叠世);主量元素具有高钾钙碱性系列弱过铝质花岗岩的特征,硅钛高、镁铁低、略低铝和富碱富钾低钠;微量元素中亏损Ba、Sr和Ti,富集Rb、Th、Pb和Nd,且稀土配分曲线为右倾的轻稀土富集型,轻重稀土分馏明显,Eu负异常明显,与S型花岗岩地球化学特征一致。分析认为,下古选地区赋矿花岗岩可能是上地壳富铝的浅变质岩系在晚三叠世挤压向伸展转换的背景下,因减压增温导致其部分熔融所形成的产物。与正常花岗岩相比较,蚀变(含矿)花岗碎裂岩具有更高的SiO2含量、成倍数增加的CaO和P2O5含量以及Fe2O3/FeO和HREE/LREE比值、高的U和P含量等,这些都指示研究区U的聚集沉淀与P、LREE和HREE的化学活动密切相关。总结的这些化学指标是寻找花岗岩岩体内带硅质脉型铀矿化的有益指示。
吕川 , 陈昌 , 聂斌 . 鹿井铀矿田QFⅤ号矿带东段赋矿花岗岩的岩石学、地球化学特征[J]. 世界核地质科学, 2025 , 42(2) : 277 -290 . DOI: 10.3969/j.issn.1672-0636.2025.02.005
In the Xiaguxuan area of the eastern QFⅤ ore belt in the Lujing uranium ore-field,siliceous vein type uranium mineralization occurs. The ore-bearing rock is medium-coarse-grained porphyritic biotite granite. The hydrothermal alteration near the ore mainly includes hematitization,silicification,chloritization and carbonatization. Zircon U-Pb chronology,petrography and petrogeochemical analysis show that the zircon U-Pb concordant age of the uranium-bearing fresh granite is 228.3 Ma and the weighted average age is 228.9 Ma,which was formed in the second stage of the Indosinian period (Late Triassic). The major elements are characterized by high potassium calc-alkaline series and weakly peraluminous granite,with high contents of silicon and titanium,low contents of magnesium and iron,slightly low aluminum,rich in alkalis and potassium and low in sodium. Among the trace elements,Ba,Sr and Ti are depleted, while Rb,Th,Pb and Nd are enriched. The rare earth distribution curve is of light rare earth enrichment type with right inclination,and there is obvious fractionation between light and heavy rare earth elements,with obvious negative Eu anomaly,which is consistent with the geochemical characteristics of S-type granite. It is considered through analysis that the ore-hosting granite in the Xiaguxuan area may be the product formed by the partial melting of the aluminous shallow metamorphic rock series in the upper crust due to decompression and temperature increase under the background of the transition from compression to extension in the Late Triassic. Compared with normal granite,the ore-bearing granite has a higher SiO2 content, a multiple increase in the contents of CaO and P2O5,as well as the ratios of Fe2O3/FeO and HREE/LREE,and high contents of U and P,etc. All these indicate that the aggregation and precipitation of U in the study area are closely related to the chemical activities of P,LREE and HREE. These summarized chemical indexes are useful indicators for searching for siliceous vein type uranium mineralization in the inner zone of the granite body.
图1 华东南大地构造分区及鹿井铀矿田地质简图(据参考文献[14]修改)1—赣州组;2—跳马涧组;3—下黄坑组;4—茶园头组;5—香楠组;6—坝里组;7—燕山早期第三阶段中细粒二云母花岗岩;8—燕山早期第2阶段中细粒黑云母花岗岩;9—印支期第2阶段中粗粒斑状黑云母花岗岩;10—加里东晚期中粒黑云母花岗岩;11—燕山晚期辉绿岩脉;12—碱交代(岩);13—断裂及产状;14—不整合接触界线;15—地质界线;16—大型、中型铀矿床;17—小型铀矿床、铀矿点;18—研究区。 Fig. 1 Tectonic division map of Southeast China and geological sketch of the Lujing uranium ore field (modified after Reference[14]) 1-Ganzhou formation;2-Tiaomajian formation;3-Xiahuangkeng formation;4-Chayuantou formation;5-Xiangnan formation;6-Bali formation;7-Medium-fine grained two-mica granite in the third stage of the Early Yanshanian period;8-Medium-fine grained biotite granite in the second stage of the early Yanshanian period;9-Medium-coarse grained porphyritic biotite granite in the second stage of the Indosinian period;10-Medium grained biotite granite in the late Caledonian period;11-Diabase dike in the late Yanshanian period;12-Alkali metasomatite;13-Fault and its occurrence;14-Unconformity contact boundary;15-Geological boundary;16-Large and medium-sized uranium deposits;17-Small uranium deposits and uranium ore occurrences;18-Study area. |
图6 下古选地区蚀变(含矿)花岗碎裂岩锆石U-Pb谐和图、加权平均206Pb/238U年龄图Fig. 6 Concordia diagrams of the zircon U-Pb dating and weighted mean diagrams of 206Pb/238U apparent ages for the altered granitic cataclastic rock in Xiaguxuan area |
表1 下古选地区正常花岗岩锆石LA-ICP-MS U-Pb定年分析结果Table 1 Analytical results of zircon LA-ICP-MS U-Pb dating of normal granite in the Xiaguxuan area |
| 测点号 | 含量/×10-6 | 同位素比值 | 年龄/Ma | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pb | Th | U | 207Pb/206Pb | 1σ | 207Pb/235U | 1σ | 206Pb/238U | 1σ | 207Pb/235U | 1σ | 206Pb/238U | 1σ | |
| X20-7-1 | 57.0 | 59.9 | 451 | 0.069 9 | 0.001 3 | 1.044 7 | 0.025 2 | 0.108 4 | 0.001 9 | 726 | 13 | 664 | 11 |
| X20-7-2 | 231 | 375 | 5 740 | 0.051 6 | 0.000 7 | 0.261 6 | 0.004 1 | 0.036 8 | 0.000 4 | 236 | 3 | 233 | 2 |
| X20-7-3 | 35.1 | 156 | 820 | 0.052 7 | 0.001 1 | 0.266 8 | 0.006 1 | 0.036 7 | 0.000 6 | 240 | 5 | 232 | 4 |
| X20-7-4 | 74.1 | 352 | 1 794 | 0.052 1 | 0.001 0 | 0.257 4 | 0.005 6 | 0.035 8 | 0.000 5 | 233 | 5 | 227 | 3 |
| X20-7-5 | 113 | 646 | 2 599 | 0.059 4 | 0.000 9 | 0.290 3 | 0.004 9 | 0.035 5 | 0.000 4 | 259 | 4 | 225 | 3 |
| X20-7-6 | 140 | 67.5 | 3 564 | 0.051 2 | 0.000 8 | 0.255 2 | 0.003 8 | 0.036 2 | 0.000 3 | 231 | 3 | 229 | 2 |
| X20-7-7 | 277 | 172 | 7 158 | 0.052 7 | 0.001 4 | 0.256 9 | 0.006 5 | 0.035 3 | 0.000 6 | 232 | 5 | 224 | 4 |
| X20-7-8 | 37.9 | 157 | 888 | 0.052 1 | 0.001 0 | 0.261 9 | 0.005 3 | 0.036 4 | 0.000 4 | 236 | 4 | 231 | 2 |
| X20-7-9 | 11.8 | 44.7 | 94.0 | 0.061 8 | 0.002 1 | 0.799 7 | 0.028 4 | 0.093 8 | 0.002 1 | 597 | 16 | 578 | 12 |
| X20-7-10 | 57.5 | 285 | 1 320 | 0.053 4 | 0.001 6 | 0.267 2 | 0.009 0 | 0.036 3 | 0.000 6 | 240 | 7 | 230 | 4 |
| X20-7-11 | 26.7 | 218 | 560 | 0.052 1 | 0.001 2 | 0.262 8 | 0.007 1 | 0.036 6 | 0.000 7 | 237 | 6 | 232 | 4 |
| X20-7-12 | 93.2 | 236 | 2 339 | 0.051 2 | 0.001 0 | 0.247 3 | 0.005 4 | 0.035 0 | 0.000 4 | 224 | 4 | 222 | 2 |
| X20-7-13 | 25.1 | 201 | 562 | 0.054 4 | 0.003 6 | 0.268 3 | 0.020 7 | 0.035 8 | 0.001 0 | 241 | 17 | 227 | 6 |
| X20-7-14 | 52.7 | 168 | 1 271 | 0.050 5 | 0.001 0 | 0.251 0 | 0.005 6 | 0.036 0 | 0.000 4 | 227 | 5 | 228 | 3 |
| X20-7-15 | 69.4 | 373 | 792 | 0.0584 | 0.001 0 | 0.533 3 | 0.018 4 | 0.066 2 | 0.001 9 | 434 | 12 | 413 | 12 |
| X20-7-16 | 49.7 | 261 | 1 140 | 0.052 3 | 0.001 1 | 0.262 1 | 0.006 6 | 0.036 4 | 0.000 6 | 236 | 5 | 230 | 4 |
| X20-7-17 | 36.8 | 535 | 746 | 0.053 1 | 0.001 7 | 0.260 3 | 0.008 5 | 0.035 5 | 0.000 4 | 235 | 7 | 225 | 2 |
| X20-7-18 | 98.2 | 334 | 2 344 | 0.051 8 | 0.000 8 | 0.261 9 | 0.005 0 | 0.036 6 | 0.000 5 | 236 | 4 | 232 | 3 |
| X20-7-19 | 38.8 | 113 | 930 | 0.054 3 | 0.001 1 | 0.272 4 | 0.006 6 | 0.036 4 | 0.000 6 | 245 | 5 | 230 | 4 |
| X20-7-20 | 51.6 | 154 | 1 231 | 0.051 7 | 0.001 1 | 0.263 1 | 0.005 2 | 0.036 9 | 0.000 4 | 237 | 4 | 234 | 3 |
| X20-7-21 | 60.8 | 642 | 1 313 | 0.052 6 | 0.001 2 | 0.261 0 | 0.006 2 | 0.036 0 | 0.000 4 | 235 | 5 | 228 | 2 |
| X20-7-22 | 190 | 489 | 5 313 | 0.051 7 | 0.001 9 | 0.232 5 | 0.012 3 | 0.032 6 | 0.000 7 | 212 | 10 | 207 | 4 |
| X20-7-23 | 197 | 487 | 5 889 | 0.055 2 | 0.000 9 | 0.230 5 | 0.003 9 | 0.030 3 | 0.000 5 | 211 | 3 | 192 | 3 |
| X20-7-24 | 249 | 255 | 7 543 | 0.056 9 | 0.001 3 | 0.235 3 | 0.004 2 | 0.030 0 | 0.000 4 | 215 | 3 | 191 | 3 |
| X20-7-25 | 21.0 | 184 | 468 | 0.050 9 | 0.001 4 | 0.254 7 | 0.007 2 | 0.036 3 | 0.000 5 | 230 | 6 | 230 | 3 |
| X20-7-26 | 154 | 353 | 4 072 | 0.057 3 | 0.001 3 | 0.269 2 | 0.005 7 | 0.034 1 | 0.000 4 | 242 | 5 | 216 | 3 |
| X20-7-27 | 122 | 1207 | 3 829 | 0.079 4 | 0.002 6 | 0.259 3 | 0.008 8 | 0.023 7 | 0.000 3 | 234 | 7 | 151 | 2 |
| X20-7-28 | 38.5 | 307 | 899 | 0.052 8 | 0.001 4 | 0.257 9 | 0.007 7 | 0.035 4 | 0.000 6 | 233 | 6 | 224 | 4 |
| X20-7-29 | 295 | 193 | 7 528 | 0.056 8 | 0.001 0 | 0.284 7 | 0.005 7 | 0.036 3 | 0.000 4 | 254 | 5 | 230 | 2 |
| X20-7-30 | 22.5 | 395 | 401 | 0.073 6 | 0.002 6 | 0.371 2 | 0.013 3 | 0.036 6 | 0.000 6 | 321 | 10 | 231 | 4 |
表2 下古选地区正常花岗岩、碎裂花岗岩及蚀变(含矿)花岗碎裂岩主量元素组成//%Table 2 Compositions of major elements of normal granite, cataclastic granite and altered granitic cataclastic rock in the Xiaguxuan area/10-6 |
| 样号 | X20-1 | X20-2 | X20-3 | X20-4 | X20-5 | X20-6 | X20-7 | X20-8 |
|---|---|---|---|---|---|---|---|---|
| 样品描述 | 碎裂花岗岩 | 蚀变(含矿)花岗碎裂岩 | 中粗粒斑状黑云母花岗岩 | |||||
| 铀矿化情况 | 异常 | 工业 | 无矿 | |||||
| SiO2 | 74.37 | 76.12 | 64.72 | 72.15 | 80.62 | 68.52 | 75.41 | 74.04 |
| Fe2O3 | 1.04 | 1.10 | 0.95 | 1.00 | 1.94 | 0.84 | 1.58 | 0.97 |
| FeO | 1.67 | 1.37 | 2.63 | 0.23 | 0.14 | 1.65 | 0.54 | 0.93 |
| Al2O3 | 11.74 | 11.04 | 16.03 | 2.19 | 4.50 | 14.75 | 10.88 | 11.88 |
| CaO | 0.64 | 0.52 | 1.81 | 12.61 | 5.29 | 1.28 | 0.89 | 1.07 |
| MgO | 0.69 | 0.65 | 0.89 | 0.11 | 0.12 | 0.57 | 0.54 | 0.43 |
| K2O | 4.85 | 4.44 | 7.02 | 0.34 | 0.40 | 6.58 | 4.88 | 5.15 |
| Na2O | 2.57 | 2.40 | 3.32 | 0.15 | 0.13 | 2.89 | 2.11 | 2.66 |
| MnO | 0.08 | 0.09 | 0.08 | 0.10 | 0.09 | 0.06 | 0.10 | 0.09 |
| TiO2 | 0.39 | 0.31 | 0.56 | 0.06 | 0.15 | 0.35 | 0.24 | 0.23 |
| P2O5 | 0.19 | 0.16 | 0.61 | 9.03 | 3.79 | 0.31 | 0.24 | 0.16 |
| 微量 | 0.18 | 0.15 | 0.26 | 0.07 | 0.08 | 0.23 | 0.16 | 0.14 |
| 烧失量 | 1.03 | 1.67 | 1.49 | 1.38 | 2.26 | 1.53 | 1.73 | 1.79 |
| 总量 | 99.46 | 100.02 | 100.35 | 99.43 | 99.52 | 99.34 | 99.30 | 99.54 |
表3 下古选地区正常花岗岩、碎裂花岗岩及蚀变(含矿)花岗碎裂岩微量元素组成/10-6Table 3 Compositions of trace elements of normal granite, cataclastic granite and altered granitic cataclastic rock in the Xiaguxuan area /10-6 |
| 样号 | X20-1 | X20-2 | X20-3 | X20-4 | X20-5 | X20-6 | X20-7 | X20-8 |
|---|---|---|---|---|---|---|---|---|
| 样品描述 | 碎裂花岗岩 | 蚀变(含矿)花岗碎裂岩 | 中粗粒斑状黑云母花岗岩 | |||||
| 铀矿化情况 | 异常 | 工业 | 无矿 | |||||
| U | 130 | 89.8 | 129 | 1 211 | 532 | 33.3 | 22.5 | 47.3 |
| Li | 31.80 | 31.72 | 48.02 | 110.63 | 119.49 | 37.64 | 27.65 | 19.29 |
| Be | 2.77 | 4.73 | 5.79 | 6.58 | 8.30 | 5.42 | 2.62 | 7.72 |
| Sc | 5.24 | 4.62 | 8.64 | 1.57 | 2.52 | 6.08 | 3.88 | 5.20 |
| V | 34.83 | 23.79 | 39.68 | 13.81 | 18.16 | 25.98 | 18.58 | 16.14 |
| Cr | 43.96 | 50.17 | 32.42 | 29.78 | 33.61 | 30.45 | 37.21 | 33.88 |
| Co | 4.72 | 3.60 | 5.75 | 1.06 | 1.84 | 3.67 | 2.65 | 2.67 |
| Ni | 6.93 | 6.52 | 9.04 | 1.97 | 3.43 | 3.51 | 4.65 | 3.49 |
| Cu | 10.46 | 9.28 | 16.16 | 9.04 | 12.31 | 6.14 | 6.24 | 5.70 |
| Zn | 143.64 | 128.74 | 117.73 | 41.19 | 56.38 | 67.57 | 79.80 | 49.95 |
| Ga | 16.71 | 17.32 | 27.85 | 5.56 | 8.44 | 21.87 | 14.26 | 15.40 |
| Rb | 273.05 | 254.53 | 403.45 | 51.49 | 62.62 | 396.65 | 256.36 | 330.00 |
| Sr | 115.01 | 74.41 | 144.59 | 61.59 | 36.51 | 141.04 | 99.41 | 80.53 |
| Y | 27.6 | 21.1 | 53.1 | 36.3 | 26.6 | 23.7 | 18.2 | 23.8 |
| Nb | 15.40 | 20.16 | 33.60 | 6.18 | 8.36 | 20.56 | 12.23 | 13.99 |
| Mo | 1.90 | 3.18 | 12.57 | 3.03 | 1.69 | 2.33 | 1.49 | 1.40 |
| Cd | 0.27 | 0.37 | 0.20 | 3.60 | 1.36 | 0.17 | 0.25 | 0.02 |
| In | 0.05 | 0.05 | 0.07 | 0.01 | 0.02 | 0.05 | 0.03 | 0.02 |
| Sn | 8.10 | 8.36 | 18.19 | 2.45 | 3.62 | 10.31 | 6.85 | 8.03 |
| Cs | 7.56 | 8.76 | 9.43 | 10.50 | 13.03 | 11.01 | 8.64 | 8.57 |
| Ba | 633.1 | 443.8 | 1025.0 | 171.8 | 165.4 | 1011.3 | 642.6 | 431.3 |
| La | 46.8 | 46.3 | 83.2 | 12.5 | 22.0 | 55.4 | 39.7 | 50.2 |
| Ta | 0.50 | 1.04 | 2.22 | 0.13 | 0.63 | 1.05 | 0.97 | 1.40 |
| W | 2.25 | 1.97 | 5.19 | 10.90 | 13.36 | 3.71 | 2.23 | 2.39 |
| Tl | 1.72 | 1.59 | 2.45 | 0.29 | 0.36 | 2.30 | 1.65 | 1.95 |
| Pb | 60.84 | 46.57 | 61.28 | 38.16 | 44.91 | 62.07 | 49.32 | 45.27 |
| Bi | 2.40 | 0.72 | 0.53 | 0.63 | 0.77 | 0.34 | 0.55 | 0.57 |
| Zr | 130.10 | 113.50 | 158.77 | 25.58 | 56.62 | 110.31 | 83.97 | 84.90 |
| Th | 35.74 | 33.86 | 53.23 | 6.30 | 13.32 | 35.84 | 34.10 | |
| Hf | 2.09 | 1.86 | 2.66 | 0.40 | 0.82 | 1.70 | 1.38 | 1.40 |
表4 下古选地区正常花岗岩、碎裂花岗岩及蚀变(含矿)花岗碎裂岩稀土元素/10-6Table 4 Compositions of rare-earth elements of normal granite, cataclastic granite and altered granitic cataclastic rock in the Xiaguxuan area /10-6 |
| 样号 | X20-1 | X20-2 | X20-3 | X20-4 | X20-5 | X20-6 | X20-7 | X20-8 | |
|---|---|---|---|---|---|---|---|---|---|
| 样品描述 | 弱蚀变碎裂花岗岩 | 蚀变(含矿)花岗碎裂岩 | 中粗粒斑状黑云母花岗岩 | ||||||
| 铀矿化情况 | 异常 | 工业 | 无矿 | ||||||
| La | 46.86 | 46.33 | 83.25 | 12.54 | 22.08 | 55.45 | 39.73 | 50.27 | |
| Ce | 97.62 | 94.90 | 174.35 | 29.60 | 43.56 | 114.33 | 80.49 | 103.90 | |
| Pr | 11.04 | 10.85 | 19.46 | 2.90 | 5.32 | 13.13 | 8.92 | 11.69 | |
| Nd | 41.55 | 41.06 | 73.74 | 11.06 | 20.40 | 49.23 | 34.10 | 43.51 | |
| Sm | 7.39 | 7.06 | 13.96 | 2.56 | 4.07 | 8.81 | 6.08 | 7.67 | |
| Eu | 0.96 | 0.78 | 1.48 | 0.38 | 0.54 | 1.36 | 0.89 | 0.81 | |
| Gd | 6.80 | 6.04 | 12.88 | 2.95 | 4.09 | 7.12 | 5.29 | 6.52 | |
| Tb | 0.99 | 0.85 | 1.95 | 0.53 | 0.68 | 1.03 | 0.78 | 0.97 | |
| Dy | 4.98 | 4.11 | 9.53 | 3.46 | 3.55 | 4.78 | 3.63 | 4.56 | |
| Ho | 1.02 | 0.76 | 1.88 | 0.80 | 0.73 | 0.87 | 0.67 | 0.85 | |
| Er | 3.11 | 2.22 | 5.60 | 2.72 | 2.22 | 2.41 | 2.00 | 2.57 | |
| Tm | 0.47 | 0.35 | 0.91 | 0.50 | 0.37 | 0.38 | 0.31 | 0.41 | |
| Yb | 2.42 | 1.77 | 4.54 | 2.81 | 2.15 | 1.95 | 1.59 | 2.18 | |
| Lu | 0.40 | 0.28 | 0.76 | 0.45 | 0.33 | 0.33 | 0.26 | 0.35 | |
| Y | 27.68 | 21.11 | 53.14 | 36.30 | 26.65 | 23.74 | 18.24 | 23.87 | |
| ∑REE | 253.29 | 238.47 | 457.43 | 109.56 | 136.74 | 284.92 | 202.98 | 260.13 | |
| LREE | 205.42 | 200.98 | 366.24 | 59.04 | 95.97 | 242.31 | 170.21 | 217.85 | |
| HREE | 20.19 | 16.38 | 38.05 | 14.22 | 14.12 | 18.87 | 14.53 | 18.41 | |
| LREE/HREE | 10.17 | 12.27 | 9.63 | 4.15 | 6.80 | 12.84 | 11.71 | 11.83 | |
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