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地质科学  1999, Vol. Issue (1): 116-122    DOI:
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Barbados岛珊瑚礁高精度铀系年龄及讨论
马志邦1, 夏明1, 张承蕙1, 王兆荣2, 彭子成2, 孙卫东2
1. 中国科学院地质研究所, 北京 100029;
2. 中国科学技术大学地球和空间科学系, 合肥 230026
HIGH PRECISION DATING AND DISCUSSION OF CORAL REEFS FROM BARBADOS WITH U-SERIES METHOD
Ma Zhibang1, Xia Ming1, Zhang Chenghui1, Wang Zhaorong2, Peng Zicheng2, Sun Weidong2
1. Institute of Geology, Chinese Academy of Science, Beijing 100029;
2. Department of Earth and Space Science, USTC, Hefei 230026
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摘要 应用同位素稀释法热电离质谱(TIMS)技术测定珊瑚礁的高精度铀系年龄。通过对BarbadosⅢ、Ⅳ阶地等样品分析,RendezvousHil和Curacao+6m的TIMS年龄分别为129.2±1.2kaB.P.和125.4±1.1kaB.P.,对应深海沉积物氧同位素第5期5e段的高海面;Kendal山阶地为208.1±1.9kaB.P.,可能代表7c间冰期高海平面的时代。该结果与Edwards等测定同一阶地的年龄一致,与α谱法数据在误差范围内吻合。另外,探讨了初始铀同位素比值的变化,并对TIMS年龄的可靠性做了评价。
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马志邦
夏明
张承蕙
王兆荣
彭子成
孙卫东
关键词热电离质谱技术   Barbados珊瑚   高精度铀系年龄   古气候意义     
Abstract: We have developed newly technique to measure 230Th abundance in corals by isotope dilution thermal ionization mass spectrometry(TIMS).This has alowed us to reduce significantly the counting statistics for U and Th isotopes and greatly reduce the sample size.So it is suggested that with high precision TIMS technique,the ages of coral from Barbados might be given.Five samples of coral have been analyzed with TIMS. The results of TIMS dating show that the ages of B-1,B-2 and B-3 are 129.2±1.2ka(Rendezvous Hill),125.4±1.1ka(Curacao+6m)and 208.1±1.9ka B.P.(Kendal Hill),respectively,which corresponding to a high sea level of substage 5e and 7c of the oxygen isotope records from deep sea cores.The Rendezvous Hill and Curacao ages are the same as those reported by Edwards et al.For five samples,the agreement between the ages determined by TIMS and the previously ages determined by α counting is generally good within the error limits.The error in age,based on analytical errors,for the TIMS measurement is about ten times smaller than the error in age for the α spectrometric measurement. The results of this study suggest that the change in isotopic compositions for the high precise analysis is probably from post depositional alteration.It would not be detected by thin section or x ray diffraction examination,because higher initial uranium isotope ratios were obtained from samples that met criteria for reliable ages as discussed previously.However,improvement the identify and tests level of the minerals are adequate for obtained reliable ages of TIMS.
Key wordsTIMS technique   Coral reefs   High precision U-series ages   Palaeoclimatic implication   Barbados   
收稿日期: 1998-02-18;
基金资助:国家自然科学基金
引用本文:   
马志邦,夏明,张承蕙等. 1999, Barbados岛珊瑚礁高精度铀系年龄及讨论. 地质科学, (1): 116-122.
Ma Zhibang,Xia Ming,Zhang Chenghui et al. HIGH PRECISION DATING AND DISCUSSION OF CORAL REEFS FROM BARBADOS WITH U-SERIES METHOD[J]. Chinese Journal of Geology, 1999, (1): 116-122.
 
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