Timing on Cave Deposit (Stalagmites) by High-Precision Thermal Ionization Mass Spectrometry (TIMS)

WANG Zhao rong; PENG Zi cheng; SUN Wei dong; JI Shoubin

Cave calcium has turned out to be a very important data-bank of paleoclimatic evolution.Stalagmite,flow stone and calcite veins in caves,like tree rings,ice cores,loess and lacustrine deposits,contain precise records of past environmental variation.Deciphering of these "codes" would contribute significantly to a better understanding of environmental changes on a global scale and would thereby enable us to make a better prediction of the future trend of climatic and environmental evolution. Highly precise dating is one of the problems in global change study and is recently considered as a hot point in the Quaternary geology.With high-sensitive and high-precision U-Th disequilibrium method,Quaternary geology age by thermal ionization mass spectrolmetry (TIMS) has been determined.This has obtained significant achievements in palaeoclimate,palaeoenvironment,palaeo-ocean,archaeology and modern volcanism-magmatism studies.In this paper,we have determined Chinese standard sample stalagmite (GBW4412,GBW4413) and international standare sample Cpra;s(RKM-4) By MAT-262 mass spectrometer.The measured U content,isotopic ration and age value comply with that of the standard sample very well,indicating that an ideal tool for precise timing,which is the TIMS method is analysis also of advantages such as rapid,high precision and low sample comsuption.

1. University of Science and Technology of China,Hefei 230026;

2. Advanced Centre for Earth Science and Astronomy,USTC.Third world Academy of Sciencs Hefei 230026

Received Date: 1998-05-04

Rev Recd Date: 1999-01-02

Publish Date: 2000-03-10

Key words:

Thermal-ionization mass spectrometry(TIMS) /
U-Th disequilibrium age determination /
stalagmites

Abstract: Cave calcium has turned out to be a very important data-bank of paleoclimatic evolution.Stalagmite,flow stone and calcite veins in caves,like tree rings,ice cores,loess and lacustrine deposits,contain precise records of past environmental variation.Deciphering of these "codes" would contribute significantly to a better understanding of environmental changes on a global scale and would thereby enable us to make a better prediction of the future trend of climatic and environmental evolution. Highly precise dating is one of the problems in global change study and is recently considered as a hot point in the Quaternary geology.With high-sensitive and high-precision U-Th disequilibrium method,Quaternary geology age by thermal ionization mass spectrolmetry (TIMS) has been determined.This has obtained significant achievements in palaeoclimate,palaeoenvironment,palaeo-ocean,archaeology and modern volcanism-magmatism studies.In this paper,we have determined Chinese standard sample stalagmite (GBW4412,GBW4413) and international standare sample Cpra;s(RKM-4) By MAT-262 mass spectrometer.The measured U content,isotopic ration and age value comply with that of the standard sample very well,indicating that an ideal tool for precise timing,which is the TIMS method is analysis also of advantages such as rapid,high precision and low sample comsuption.

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Reference (7)

[1]	谭明，刘东生.洞穴碳酸钙沉积的古气候记录研究[J].地球科学进展，1996，11(4)：383～395
[2]	袁道先.岩溶与全球变化研究[J].地球科学进展.1995，10(5)：471～474
[3]	Edwards R L,Chen J H.Ku T L,et al.Precise timing of the last interglacial petiod from mass spectrometric determination of Thoninm230 in Corals[J].Science,1997,236：1 547～1 553
[4]	夏明，张承惠，马志邦.铀系国内对比计划的结果和讨论[J〗.中国科学，B辑，1986，(4)：417
[5]	彭子成，王兆荣，孙卫东等.高精度热电离质谱(TISM)铀系法对第四纪标样年龄测定的研究[J].科学通报，1997，42(19)：2 090～2 093
[6]	Holmgren K,and Karlen W,et al.Paleoclimate significance of the stable isotopic complsition and petrology of late Pleistocene stalagmite from Botswans[J].Qustermary Research,1995,43：320～328
[7]	彭子成.第四纪年龄测定的新技术—热电离质谱铀系法的发展近况[J].第四纪研究，1997，3：258～264

[1]	谭明，刘东生.洞穴碳酸钙沉积的古气候记录研究[J].地球科学进展，1996，11(4)：383～395
[2]	袁道先.岩溶与全球变化研究[J].地球科学进展.1995，10(5)：471～474
[3]	Edwards R L,Chen J H.Ku T L,et al.Precise timing of the last interglacial petiod from mass spectrometric determination of Thoninm230 in Corals[J].Science,1997,236：1 547～1 553
[4]	夏明，张承惠，马志邦.铀系国内对比计划的结果和讨论[J〗.中国科学，B辑，1986，(4)：417
[5]	彭子成，王兆荣，孙卫东等.高精度热电离质谱(TISM)铀系法对第四纪标样年龄测定的研究[J].科学通报，1997，42(19)：2 090～2 093
[6]	Holmgren K,and Karlen W,et al.Paleoclimate significance of the stable isotopic complsition and petrology of late Pleistocene stalagmite from Botswans[J].Qustermary Research,1995,43：320～328
[7]	彭子成.第四纪年龄测定的新技术—热电离质谱铀系法的发展近况[J].第四纪研究，1997，3：258～264

Timing on Cave Deposit (Stalagmites) by High-Precision Thermal Ionization Mass Spectrometry (TIMS)

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