石膏裂变径迹测年研究及其存在的问题  

GYPSUM FISSION TRACK DATING AND SOME RELEVANT PROBLEMS

作　　者：宋友桂[1] 

机构地区：[1]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室

出　　处：《海洋地质与第四纪地质》2003年第2期79-84,共6页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金资助项目(40202019);国家重点基础研究专项 (G1 9980 40 80 9;G 1 9990 43 40 1 );中科院引进国外杰出人才计划 ;中科院知识创新重要方向性项目 (KZCX2 SW 1 1 8);中国博士后科学基金 (2 0 0 2 0 3 1 2 3 4)

摘　　要：对石膏裂变径迹测年的可行性及研究方法进行了探讨,研究表明,无论矿物结构特征还是铀含量与年龄关系均说明石膏可用于裂变径迹测年,其测定的年龄能较好地与古地磁、地层学、古生物学上的证据吻合,裂变径迹年龄与自发径迹密度和诱发径迹密度比值(ρs/ρi)相关分析进一步证明石膏测定的裂变径迹年龄是可信的。同时发现在中子通量相同的情况下,石膏裂变径迹年龄与铀含量并不存在特定的相关关系。为了进一步提高石膏裂变径迹测年数据的可靠性、精确度和可比性,今后研究中应加强最佳蚀刻条件、退火机制的研究和标准年龄对比法的应用。The feasibility of gypsum fission track dating is discussed and some relevant problems pointed out. The results indicate that gypsum is a feasible mineral for fission track dating either from the mineral structure or from the relation between the uranium content and age. The given age is well correlated with other results from paleomagnetism, stratigraphy and paleobiology. Regression analyses from the fission track age and the ratio of spontaneous track density to induced track density (ρs/ρi) also prove the reliability of gypsum fission track dating, but the age is not linear to uranium content under the same neutron flux. In order to obtain the reliable, accurate and universally contrastive data of gypsum fission track dating, we should put stress on the studies of the best appropriate etching conditions and on the annealing kinetics of fission track and improve the application of zeta (ζ) calibration method in the future.

关 键 词：石膏 裂变径迹 年代学 测年 

分 类 号：P619.1[天文地球—矿床学]