滇东南地区中三叠统沉积型锰矿的热释光特征  

Thermoluminescence(TL) Characteristic of Sedimentary Manganese Ores from Southeastern Yunnan Area

作　　者：达雪娟[1] 伊海生[2] 陈兰[1] 

机构地区：[1]重庆科技学院石油与天然气工程学院,重庆401331 [2]成都理工大学沉积地质研究院,成都610059

出　　处：《地质论评》2010年第5期739-744,共6页Geological Review

基　　金："十一五"国家科技支撑计划项目(编号2006BAB01A12-5)的成果

摘　　要：矿物和岩石的热释光是矿物晶体特征中研究程度较低的领域。将采自滇东南地区中三叠统的锰矿样品分类后进行热释光实验研究。实验发现:上矿段褐红色锰碳酸盐集合体的热释光谱线多两峰型,前特征峰位于250～350℃之间,后特征峰位于350～430℃之间,且前峰的峰值明显低于后峰,热释光强度最大值均出现在最高温度——450℃处,前峰均存在,后峰偶有缺失;下矿段黑色锰氧化物集合体的热释光特征是在280～340℃处为第一峰,而在390±10℃范围内为一拐点,420±10℃处为另一拐点,使热释光谱线呈现阶梯状,但部分样品第一峰缺失。将上、下矿段同类矿样的热释光谱线对比发现:上、下矿段内部的同类型矿石的热释光特征具相似性,上、下矿段之间的同类型矿石的热释光特征几乎无可比性,说明矿石形成时所处环境对热释光谱线的影响大于矿物成分对矿石热释光谱线的影响。Research degree on the thermoluminescence of minerals and rocks is low in the study of microscopic characteristics of mineral crystals. The samples of manganese ore were divided three types. Measures of the maroon manganese Carbonate ore in upper ore block,the experimental results indicate that temperature—thermo luminescence curves are the special double-peak curves. The temperature of prepeak range from 250℃ to 350℃,and the temperature of postpeak range from350℃ to 430℃. The average value of postpeaks is higher than prepeak. The temperature of maximum thermoluminescence intensity is the highest temperature——450℃（such as Lm3）。The prepeaks are all exited,but some of the postpeaks are missing. Measures of the oxidized manganese ore in lower ore block,the experimental results indicate that temperature—thermo luminescence curves present stepladder curves. the temperature of prepeak range from280℃ to 340℃,the temperature of the first inflection point range from380℃ to 400℃,the temperature of the second inflection point range from410℃ to 430℃. But the postpeaks of curves are missing for some samples. By contrast,the features thermoluminescence curves is comparable in the internal of ore beds,but is incomparable between the upper ore bed and the lower ore bed. This fully explains that the effect of temperature—thermo luminescence curves on genetic environment is much large than mineral composition.

关 键 词：热释光 锰矿石 中三叠统 法郎组 滇东南地区 

分 类 号：P618.32[天文地球—矿床学]