α铀系测年对洞穴碳酸盐沉积物中碎屑岩物质影响的祛除研究  

The Removal of the Disturbance of the Clastic Rock Material from Cave Carbonate Sediments in Alpha U-series Dating Method

作　　者：王华[1,3,4] 殷建军[2,3,4] 俞建国[1,3,4] 黄秋英[1,3,4] 林玉石[1,3,4] 

机构地区：[1]中国地质科学院岩溶地质研究所,广西桂林541004 [2]西南大学地理科学学院,三峡库区生态环境教育部重点实验室,广西桂林541004 [3]国土资源部/广西壮族自治区岩溶动力学重点实验室,广西桂林541004 [4]联合国教科文组织国际岩溶研究中心,重庆400715

出　　处：《地球学报》2012年第6期936-940,共5页Acta Geoscientica Sinica

基　　金：中国地质调查局地质调查项目"高分辨率洞穴石笋记录气候突变及其规律性研究"(编号:1212011087115)资助

摘　　要：洞穴碳酸盐沉积物常因为含有碎屑岩物质,而导致测年精度下降,甚至导致测年失败。通过对干扰物的X射线荧光分析,发现Mg、Ca、P、Si、Al等元素含量尤其高,其矿物组成可能为方解石、磷酸盐、硅酸盐、铝盐、粘土矿物、石英、云母类。通过改进化学流程,在化学处理过程中将含量高的P、Al、Si元素祛除,提高了测量精度,说明此改进有利于含碎屑物质的洞穴碳酸盐沉积物的α铀系年龄研究。As cave carbonate sediments usually contain some clastic rock materials, the accuracy of the alpha U-series dating may decrease, which even leads to the failure of the U-series dating. X ray fluorescence analysis reveals that such elements as Mg, Ca, P, Si and A1 are especially high in the disturbing materials, and the mineral compositions of these elements may be calcite, phosphate, silicate, aluminum salt, clay materials, quartz and mica. The authors changed the chemical process, removed the high level elements like P, A1, Si, and improved the accuracy of the measurements. The results obtained by the authors can improve the research on cave carbonate sediments which contain clastic rock materials.

关 键 词：α铀系测年 碎屑岩物质 干扰祛除 

分 类 号：P578.5[天文地球—矿物学] P579.1[天文地球—地质学]