贵州荔波董歌洞较老石笋ICP-MS230Th测年研究及古气候应用RESEARCH ON OLD STALAGMITES BY ICP-MS 230Th DATING AND PALEOCLIMATE RECONSTRUCTION IN DONGGE CAVE,LIBO,GUIZHOU
杨琰,袁道先,程海,覃嘉铭,林玉石,张美良,朱晓燕
摘要(Abstract)：
石笋记录研究的进展与测年技术的发展密不可分,测年新技术的突破不断推动利用石笋重建古气候研究的飞速前进。在利用石笋进行古气候重建过程中,建立精确的时标是首要条件。通过对较老(>250ka)石笋的ICP-MS230Th测年研究,发现贵州荔波董歌洞D6、D7、D9石笋具有比较连续的高分辨记录,最老年龄超过400ka,通过230Th测年数据的分析为建立我国西南地区500ka以来标准剖面打下基础;对董歌洞3根大型石笋135个230Th年龄数据及生长速率的分析研究,发现石笋生长速率在大尺度的变化上与海洋沉积SPECMAP曲线δ18O记录有很好的负相关关系,并与北纬25°夏季太阳辐射能量变化曲线呈一定的正相关关系,石笋生长速率的变化在间冰期处于高值,而在冰期时为低值,在间冰期和冰期转化阶段生长速率呈跳跃式变化。通过生长速率变化分析表明,石笋生长速率记录了过去突变冷暖事件的变化,因此可以作为一个有意义的环境记录替代指标来研究古降水及古气候变化。
关键词(KeyWords)： 石笋;ICP-MS~(230)Th测年;生长速率;古气候;第四纪;董歌洞;荔波;贵州
基金项目(Foundation): 国家自然科学基金项目“我国典型地区地质作用及碳循环”(No40231008);; “中国西南2万年来高分辨率的石笋记录与全球变化的响应”(No90511004);; 中国博士后科学基金;; 西南大学自然地理学重点学科基金的联合资助
作者(Author): 杨琰,袁道先,程海,覃嘉铭,林玉石,张美良,朱晓燕
参考文献(References)：
- 程海.2002.铀系年代学新进展——ICP-MS230Th测年.第四纪研究,22(3):292
- 刘嘉麒,倪云燕,储国强.2001.第四纪的主要气候事件.第四纪研究,21(3):239—248
- 覃嘉铭,袁道先,程海,林玉石,张美良,王福星,王华.2004a.新仙女木及全新世早中期气候突变事件:贵州茂兰石笋氧同位素记录.中国科学(D辑),34(1):69—74
- 覃嘉铭,袁道先,程海,林玉石,张美良,章程,王福星,王华,冯玉梅,涂林玲,张会领.2004b.过去25万年黔桂地区千年尺度东亚季风气候的变化.中国岩溶,23(4):261—266
- 业渝光.2003.地质年代学理论与实践.北京:地质出版社.1—200
- 袁道先,刘再华,蒋忠诚,覃嘉铭,林玉石,张美良,曹建华,何师意,章程,谢运球.2003.碳循环与岩溶地质环境.北京:科学出版社.95—177
- Barefoot R R.2004.Determination of platinumgroup elements andgoldin geological materials:a review of recent magnetic sectorand laser ablation applications.Analytica Chi mica Acta,509:119—125
- Dykoskia C A,Edwards R L,Cheng Hai,Yuan Dao-xian,Cai Yan-jun,Zhang Mei-liang,Lin Yu-shi,Qin Jia-ming&An Zhi-sheng.2005.A high-resolution,absolute-dated Holocene anddeglacial Asian monsoon record from Dongge Cave,China.Earth and Planetary Science Letters,233:71—86
- Edwards R L,Chen J H&Wasserburg G J.1986.238U-234U-230Th-232Th systematics and the precise measurement of ti me o-ver the past500,000years.Earth and Planetary Science Let-ters,81:175—192
- Edwards R L,Chen J H,Ku T-L&Wasserburg GJ.1987.Preciseti ming of the last interglacial period from mass spectrometric a-nalysis of230Thin corals.Science,236:1547—1553
- Gabler H E.2002.Applications of magnetic sector ICP-MS in geo-chemistry.Journal of Geochemical Exploration,75:1—15
- Goldstein S J&Stirling C H.2003.Technique for measuring Urani-um-series nuclides:1992—2002.In:Bourdon B,Henderson GM,Lundstrom C Cet al.eds.Reviewin mineralogy and geo-chemistry(Volume52):Uranium-series geochemistry.Wash-ington:Mineralogical Society of America.50—51
- Hinrichs J&Schnetger B.1999.Afast method for the si multane-ous determination of230Th,234Uand235U with isotope dilutionsector field ICP-MS.Analyst,124:927—932
- I mbrie J,Hays J D&Martinson D G.1984.The orbital theory ofPleistocene cli mate:support from a revised chronology of ma-rineδ18Orecord.In:Berger A,I mbrie J&Hays J Deds.Mi-lankovich and cli mate.New York:Reidel Publication Compa-ny.269—305
- Kelly MJ,Edwards R L,Cheng Hai,Yuan Dao-xian,Cai Yan-jun,Zhang Mei-liang,Lin Yu-shi&An Zhi-sheng.2006.High res-olution characterization of the Asian Monsoon between146,000and99,000years B.P.from Dongge Cave,China and globalcorrelation of events surrounding Termination II.Palaeogeog-raphy,Palaeocli matology,Palaeoecology,236:20—38
- Luo Xiao-zhong,Rehkamper M,Lee D C&Halliday A N.1997.High precision230Th/232Th and234U/238U measurements usingenergy-filtered ICP magnetic sector multiple collector massspectrometry.International Journal Mass Spectrometry andIon Processess,171:105—117
- Martinson D G,Pisias NJ&Hays J D.1987.Age dating and theorbital theory of ice ages:development of a high-resolution1to300000years chronostratigraphy.Quaternary Research,27(1):1—29
- Shen Chuan-chu,Edwards R L,Cheng H,Dorale J A,Thomas RB,Moran S B,Weinstein S E&Edmonds H N.2002.Urani-um and thorium isotopic and concentration measurements bymagnetic sector inductively coupled plasma mass spectrometry.ChemGeol,185:165—178
- Stirling C H,Lee D-C,Christensen J N&Halliday A N.2000.High precisionin situ238U-234U-230Thisotopic analysis usingla-ser ablation multiple-collector ICP-MS.Geochi mica et Cosmo-chi mica Acta,64(21):3737—3750
- Wang Yong-jin,Cheng Hai,Edwards R L,He Yao-qi,Kong Xing-gong,An Zhi-sheng,Wu Jiang-ying,Kelly MJ,Dykoskia C A&Li Xiang-dong.2005.The Holocene Asian Monsoon:linksto solar changes and North Atlantic Cli mate.Science,308:854—857
- Yuan Dao-xian,Cheng Hai,Edwards R.Lawrence,Dykoskia C A,Kelly MJ,Zhang Mei-liang,Lin Yu-shi,Qin Jia-ming,WangYong-jin,Dorale J A,An Zhi-sheng&Cai Yan-jun.2004.Ti ming,duration and translations of the last interglacial AsianMonsoon.Science,304:575—578
- Zhang Mei-liang,Yuan Dao-xian,Lin Yu-shi,Cheng Hai&Qin Jia-ming.2004.The record of paleocli matic change from stalag-mites and the determination of termination II in the south ofGuizhou Province,China.Sciencein China(Series D),47(1):1—12