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姜春晖,男,1988年生,助理工程师,主要从事铀矿勘查与科研工作。E-mail:1697301603@qq.com |
收稿日期: 2025-03-27
修回日期: 2025-05-07
网络出版日期: 2025-11-06
基金资助
中国核工业地质局铀矿地质项目(202238)
Discussion on the elevation change pattern and metallogenic environment of ore bodies in southern zone 9 of Mianhuakeng deposit
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JIANG Chunhui,male,born in 1988,assistant engineer,focusing on uranium exploration and scientific research. E-mail:1697301603@qq.com |
Received date: 2025-03-27
Revised date: 2025-05-07
Online published: 2025-11-06
Supported by
The Central Financial Fund Project under the planning and jurisdiction of the China Nuclear Industry Geological Bureau(202238)
姜春晖 , 周堂波 , 郭新文 , 周航兵 , 王志 . 棉花坑矿床9号带南段不同标高矿体变化规律及成矿环境探讨[J]. 世界核地质科学, 2025 , 42(3) : 515 -526 . DOI: 10.3969/j.issn.1672-0636.2025.03.004
The southern section of Zone No. 9 in Mianhuakeng deposit is located in the middle of the Zhuguang pluton,which is a rich in uranium. The fault zone has undergone multiple tectonic and hydrothermal action ,forming the favorable space for uranium mineralization and storage. Through secondary development and utilization of data from previous exploration projects,this paper analyzes the change patterns of the ore bodies at different elevations in the southern section of Zone 9 by the statistics on grade and thickness. The results indicate that the ore body trend to be rich in the depth but remain stable in thickness on the whole with local widening. The occurring frequency of moderate and high-grade ore segments are increasing in the deep, which may be caused by the reduction environment in the deep. This understanding provides clues and basis for the next uranium predicting and prospecting.
图3 近矿围岩蚀变特征a—红褐色微晶石英和烟灰色微晶石英;b—紫黑色萤石与晚期白色梳状石英穿插;c—多种蚀变胶结;d—团块状黄铁矿。 Fig. 3 Alteration characteristics of closing ore wall rocks a-Reddish-brown microcrystalline quartz and smoky-gray microcrystalline quartz;b-Purple black fluorite interspersed with late white comb quartz;c-Various alteration cementation;d Massive uranium ore |
图4 棉花坑矿床9号带南段钻孔分布位置图Fig. 4 Borehole distribution of data acquisition in south section of zone 9 of Mianhuakeng deposit |
表1 棉花坑矿床9号带南段品位垂向分布统计表Table 1 Statistics of vertical distribution of the grade in south section of zone 9 of Mianhuakeng deposit |
| 序号 | 标高/m | 样品数/个 | 最低品位/% | 最高品位/% | 加权平均品位/% | 中间品位/% | 标准偏差/% |
|---|---|---|---|---|---|---|---|
| 1 | 400~300 | 44 | 0.050 | 0.240 | 0.083 | 0.074 | 0.044 |
| 2 | 300~200 | 31 | 0.052 | 0.252 | 0.106 | 0.076 | 0.061 |
| 3 | 200~100 | 24 | 0.060 | 0.292 | 0.108 | 0.090 | 0.058 |
| 4 | 100~0 | 35 | 0.050 | 0.600 | 0.115 | 0.083 | 0.105 |
| 5 | 0~-100 | 38 | 0.051 | 0.350 | 0.117 | 0.095 | 0.070 |
| 6 | -100~-200 | 25 | 0.052 | 0.333 | 0.120 | 0.109 | 0.076 |
| 7 | -200~-300 | 37 | 0.055 | 0.628 | 0.143 | 0.104 | 0.106 |
| 8 | -300~-400 | 16 | 0.050 | 0.463 | 0.209 | 0.109 | 0.120 |
表2 棉花坑矿床9号带南段厚度垂向分布统计表Table 2 Statistics of vertical distribution of thickness in south section of zone 9 of Mianhuakeng deposit |
| 序号 | 标高/m | 样品个数/个 | 最小厚度/m | 最大厚度/m | 平均厚度/m | 中间厚度/m | 标准偏/差m |
|---|---|---|---|---|---|---|---|
| 1 | 400~300 | 44 | 0.50 | 8.07 | 2.11 | 1.68 | 1.437 |
| 2 | 300~200 | 31 | 0.38 | 19.81 | 2.77 | 1.93 | 3.462 |
| 3 | 200~100 | 24 | 0.63 | 9.49 | 2.79 | 2.35 | 2.041 |
| 4 | 100~0 | 35 | 0.41 | 18.28 | 2.92 | 1.75 | 3.370 |
| 5 | 0~-100 | 38 | 0.52 | 12.68 | 3.18 | 2.10 | 2.997 |
| 6 | -100~-200 | 25 | 0.50 | 11.54 | 3.08 | 1.60 | 3.130 |
| 7 | -200~-300 | 37 | 0.40 | 11.64 | 2.95 | 1.71 | 3.032 |
| 8 | -300~-400 | 16 | 0.77 | 7.90 | 2.94 | 2.10 | 2.129 |
表3 棉花坑矿床9号带南段不同级别品位垂向分布统计表Table 3 Statistics of vertical distribution of ore with different grades in south section of zone 9 of Mianhuakeng deposit |
| 序号 | 标高/m | 样品数/个 | 0.05~0.1/% | 0.1~0.3/% | 0.3及以上/% |
|---|---|---|---|---|---|
| 1 | 400~300 | 44 | 34 | 10 | 0 |
| 2 | 300~200 | 31 | 20 | 11 | 0 |
| 3 | 200~100 | 24 | 18 | 6 | 0 |
| 4 | 100~0 | 35 | 25 | 8 | 2 |
| 5 | 0~-100 | 38 | 21 | 16 | 1 |
| 6 | -100~-200 | 25 | 10 | 13 | 2 |
| 7 | -200~-300 | 37 | 16 | 18 | 3 |
| 8 | -300~-400 | 16 | 5 | 8 | 3 |
图8 棉花坑矿床9号带浅部蚀变组合a~c、深部蚀变组合d~fFl—萤石;Hy—水云母;Hm—赤铁矿;Si—红色微晶石英;Cal—碳酸盐;Kl—高岭土;Ser—绢云母;Qtz—灰白色石英;Py—黄铁矿;Pit—沥青铀矿;Chl—绿泥石。 Fig. 8 The shallow alteration combination( a-c) and deep alteration combination ( d-f )in zone No. 9 of Mianhuakeng deposit Fl-Fluorite;Hy-hydromicite;Hm-Hematite;Si-Red microcrystalline quartz;Cal-Carbonation;Kl-Kaolin;Ser-Sericite;Qtz-Quartz;Py-Pyrite;Pit-Pitchblende;Chl-Chlorite. |
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