甘肃金边寺铀矿床中疑似羟水钙钛铀石的矿物学特征  

Mineralogical Characteristics of Suspected Holfertite in the Jinbiansi Uranium Deposit,Gansu Province

作　　者：吕荣平 王生云 赵剑波 张建云 黄冉笑 陈金勇[2] 李万华 LYU Rongping;WANG Shengyun;ZHAO Jianbo;ZHANG Jianyun;HUANG Ranxiao;CHEN Jinyong;LI Wanhua(CNNC Resources Development Co.,Ltd.,Beijing 100013,China;Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]中核资源发展有限公司,北京100013 [2]核工业北京地质研究院,北京100029

出　　处：《东华理工大学学报（自然科学版）》2023年第2期125-131,共7页Journal of East China University of Technology(Natural Science)

基　　金：中国铀业有限公司-东华理工大学联合创新基金(NRE2021-04);中核集团集中研发项目(41772082);国家自然科学基金项目(41602080)。

摘　　要：金边寺矿床位于甘肃龙首山铀成矿带东段。通过岩相学观察、电子探针和拉曼光谱分析,对金边寺矿床中产出的次生铀矿物进行了矿物学特征研究。结果显示,该次生铀矿物在矿物学特征、化学成分和激光拉曼光谱特征等方面均与美国犹他州托马斯山脉西部Starvation峡谷发现的羟水钙钛铀石相似。金边寺矿床羟水钙钛铀石矿物颗粒极为细小(长度小于3μm),呈长柱状、针状集合体,主要存在于矿物间或矿物裂隙、孔洞之中。矿物成分主要由UO_(3)、TiO_(2)、CaO和SiO_(2)组成,其含量分别为50.98%~65.58%(平均值为59.60%)、12.85%~19.18%(平均值为15.10%)、3.33%~9.67%(平均值为5.46%)和3.04%~8.78%(平均值为4.21%),其化学成分与典型羟水钙钛铀石化学成分较接近。金边寺羟水钙钛铀石激光拉曼光谱谱图与典型羟水钙钛铀石几乎一致,拉曼谱带峰是由于UO_(2)^(2+)和TiO的伸缩和弯曲振动以及U—OH和OTiO的弯曲振动而产生的。在分子水平上,可能是因为金边寺矿床羟水钙钛铀石颗粒细小或者形成时间短,并没有观察到明显的蜕晶质化作用影响。The Jinbiansi deposit is located in the eastern part of the Longshoushan uranium metallogenic belt in Gansu province.The uranium mineralogical characteristics of the Jinbiansi uranium deposit are studied by petrographic observation,electron probe analysis and laser Raman spectroscopy.In terms of mineralogical characteristics,chemical composition and laser Raman spectrum characteristics,the secondary uranium minerals occured in the Jinbiansi are completely analogous to the holfertite found in the Starvation Canyon in the west of the Thomas Range in Utah.The holfertite mineral particles are extremely small(length<3μm),and exist in the form of long columnar and needle-like aggregates,mainly existed among minerals or in mineral cracks and holes.Holfertite is mainly composed of UO_(3),TiO_(2),CaO and SiO_(2),with contents of 50.98%~65.58%(average 59.60%),12.85%~19.18%(average 15.10%),3.33%~9.67%(average 5.46%)and 3.04%~8.78%(average 4.21%)respectively,and its chemical composition is relatively close to the typical holfertite.The laser Raman spectrum of holfertite is almost the same as that of typical holfertite.Observed Raman bands are attributed to the UO_(2)^(2+)and TiO stretching and bending vibrations,U—OH and OTiO bending vibrations.However,at the molecular level,the effect of metamictization is not observed.The Raman spectra of holfertite does not appear to show the effects of metamictization.No decrease in intensity of bands associated with UO 2+2units is observed.

关 键 词：羟水钙钛铀石 电子探针 激光拉曼光谱 金边寺铀矿床 龙首山成矿带 

分 类 号：P619.14[天文地球—矿床学]