| 四川石棉县大水沟碲多金属矿床辉碲铋矿研究 |
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| 引用本文： | 毛景文,杨百川.四川石棉县大水沟碲多金属矿床辉碲铋矿研究[J].地质科学,1995,30(1):47-52. |
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| 作者姓名： | 毛景文 杨百川 |
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| 作者单位： | 1. 中国地质科学院矿床地质研究所 北京 100037;2. 四川稀有、贵金属公司 成都 610072 |
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| 摘 要： | 四川石棉县大水沟碲多金属矿床是一个以碲为主的矿床。在该矿床中,辉碲铋矿作为一种最主要成矿矿物而大量堆积。化学分析和X射线粉晶衍射测试表明其为标准的辉碲铋矿,晶胞参数a=4.1408-4.5225,c=29.5008-29.6170.铋含量为57.65%-58.68%,碲35.20%-36.4%和硫4.5%-5.36%.另外,辉碲铋矿含有较多的杂质元素铁、铅、硒、锑、金和银,其中硒、金和银含量分别达1600-2600g/t,1.4-10.7g/t和2300-3400g/t.辉碲铋矿的δ34S的变化范围示意出硫来源于地幔。其矿床成因可能与岩浆活动有关。
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| 关 键 词： | 辉碲铋矿 碲矿床 四川 |
| 收稿时间： | 1994-06-06 |
| 修稿时间： | 1994-06-06; |
TETRADYMITE FROM THE DASHUIGOU TELLURIUM DEPOSIT, SICHUAN,SOUTHWEST CHINA |
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| Mao Jingwen,Chen Yuchuan, Lei Yunfen and Zhou Jianxiong.TETRADYMITE FROM THE DASHUIGOU TELLURIUM DEPOSIT, SICHUAN,SOUTHWEST CHINA[J].Chinese Journal of Geology,1995,30(1):47-52. |
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| Authors: | Mao Jingwen Chen Yuchuan Lei Yunfen and Zhou Jianxiong |
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| Institution: | Institute of Mineral Deposits, CAGS, Beijing 100037) Yang Baichuan(Sichuan Company of Nonferous, Rare and Noble Metals, Chengdu, 610036 |
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| Abstract: | he Dasliuigou tellurium deposit, Sichuan, southwest China, is the first deposit dominanted by tellurium in the world. Tetradymite is the most important ore-forming mineral in the deposit. It occurs as aggregates of big euhedral crystals with diameters of 0.3 to 6 mm, which form either almost pure tetradymite massive ore or breccia ore which is composed of dolomite breccias, pyrrhtite breccias, and interstitials of tetradymite together with telubisrnuth, wehrlite, native tellurium, native silver, native gold, chalcopyrite, calcite and quartz. All the tetradymite shows perfect cleavages along (0001) plane. In reflected light the tetradymite is creamy white, shows weak reflected pleochroism, and clear optical anistropy. The reflectance given fortetradymite in literature varies over a wide range. The values obtained here are O 59.9% and E 45.5 %. The measurements were made photometrically under oil with Leiz green filter (obsorption peak at 536Hm), using a carborundum standard. The mineral may take a good polish and its polished surface is often planar. The hardness of the tetradymite was measured by flaT——3 type micrometer of hardness as 20-80 kg/mm2, which is equal to 1 to 2 Moss hardness. Its specific gravities of 7.15 to 7.28 g/cm3 were obtained by the method of hydrostastic weighing in carbon tetrachloride. Chemieal composition Ten chemical analyses of tetradymite from the Dashuigou tellurium deposit gave: Bi 57.65 %-58.68 %, Te 35.20 %-36.40 %, and S4.59 %-5.36 %, and trace elements Ag 230-340μg/g, Se 160——280μg/g, Fe 310-2800μg/g, Sb 100-280μg/g, and An 1.4-10.7g/t. It may be noted that the noble elements An and Ag are quite enriched in the tetradymite. In fact, the tetradymites are so rich ill An, Ag and Se elements that they can be recovered as by-product in the mine.X-ray diffraction Five X-ray diffraction patterns for the tetradymite wereobtained with a copper target, 45 kV, and a current 45 mA. The diffraction patterns are similar to those of the tetradymite taken by Pauling (1975). Their unit cell dimentions are a: 4.241-4.252 and c: 29.501-29.612.Sulfur isotopes Ten samples of the tetradymite were chosen to be analysed for sulfur isotopes. The result shows that their gi4S ranges from -0.5‰ to 2. 1‰with an average of 0.5‰. Discussion and conclusion Tetradymite is one of rare minerals. Since its discovery in 1851 (Jackson, 1851), it has ben reported and/or studied in the United States, Japan, the former Soviet Union, Korea, China, India, and so on. Because tellurium is one of fears-scattered elements, tetradymite recognized in the past usually occur as rare mineral in some sulfide metal deposits, gold deposits, and tungsten deposits. It is in the Dashuigou tellurium deposit where tetradymite so greatly accumulates and occurs as massive aggregates of big crystals. The tetradymite in the Dashuigou tellurium deposit is an odinary mineral, but contains a lot of trace elements, such as Fe, Ph, Sb, Se, Ag and An. It should be emphasized that grades of Se, Ag and An in the ores composed predominantely of tetradymite reach economic value. Furthermore, the sulfur isotopes of the tetradymite experienced high homogenization and all the values are distributed near δ34S=0‰. This perhaps indicates that the sulfur was derived from some magmas. |
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| Keywords: | Tetradymite Tellurium deposit Dashuigou Sichuan |
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