晚更新世云南蒋家沟流域泥石流发育的热释光证据
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摘要
由于泥石流沉积物记录的时间信息对当地历史时期的降水量和气候变化等具有重要的指示意义,先后有一系列的测年方法在泥石流沉积物测年中应用,在此基础上尝试利用热释光(TL)单片再生剂量法(SAR)对云南东川地区达朵古泥石流堆积台进行测年。得到该剖面上12个样品的等效剂量值,采用中子活化分析技术测定各样品U、Th、K含量,算得年剂量率,获得达朵台地发育的时间范围为44.4~27.1 ka BP。该台地在形成时期多次受到小江流水的改造作用,致使古今含水率差异较大、放射性元素U、Th、K的含量随深度变化的相对标准偏差也较大(依次为17%、12%和11%),是年剂量率在同一台地内波动较大的重要原因,对年剂量率取算术平均值后所得到的修正年龄随深度变化的内部一致性较好。初步研究结果表明热释光单片再生剂量法在泥石流沉积物测年方面具有一定的潜力。
The debris flow sediments record the chronology in precipitation and climate change of local historical period has important implications.A serious of dating methods were applied to debris flow deposits chronology.Attempted to utilize thermoluminescence(TL) single aliquot regenerative dose(SAR) of ancient debris flow deposits dating at Daduo in Dongchuan,Yunnan Province,achieved the equivalent dose values of 12 samples of the section,measured U,Th,K content of each sample by neutron activation technique,calculated the annual dose,obtained the range of development time is 44.4-27.1 Ka BP.It indicated that the debris flow was still developed in the late Pleistocene:the physical weathering of rocks in glacial was stronger which made minerals more broken and the precipitation in interglacial was more abuandant.The annual dose was ranther changeable which can be mainly attributed to the large scatter of water content between ancient and modern and the content of U,Th and K with depth.Standard deviation of U was 17%,Th was 12%and K was 11%.Ages of correction which was divided by arithmetic average annual dose rate had good internal consistency.The preliminary research results show that the SAR protocol of TL is a potential dating method in obtaining the chronology of debrris flow deposits.
The debris flow sediments record the chronology in precipitation and climate change of local historical period has important implications.A serious of dating methods were applied to debris flow deposits chronology.Attempted to utilize thermoluminescence(TL) single aliquot regenerative dose(SAR) of ancient debris flow deposits dating at Daduo in Dongchuan,Yunnan Province,achieved the equivalent dose values of 12 samples of the section,measured U,Th,K content of each sample by neutron activation technique,calculated the annual dose,obtained the range of development time is 44.4-27.1 Ka BP.It indicated that the debris flow was still developed in the late Pleistocene:the physical weathering of rocks in glacial was stronger which made minerals more broken and the precipitation in interglacial was more abuandant.The annual dose was ranther changeable which can be mainly attributed to the large scatter of water content between ancient and modern and the content of U,Th and K with depth.Standard deviation of U was 17%,Th was 12%and K was 11%.Ages of correction which was divided by arithmetic average annual dose rate had good internal consistency.The preliminary research results show that the SAR protocol of TL is a potential dating method in obtaining the chronology of debrris flow deposits.
引文
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[21]Winter A G,Przegietka K R.TL dating of young Aeolian deposits from kepa kujawska[J].Radiation Measurements,1998,29(3):435-439.
[22]Wallinga,J..Optically stimulated luminescenc e dating of fluvial deposits:a review[J].Boreas,2002,31(4):303-322.
[23]刘英俊,曹励明,李兆麟,等.元素地球化学[M].北京:科学出版社,1984:47-48,223-224.
[2]李永化,张小咏,崔之久.陇南山地泥石流期、气候期与构造期的耦合[J].水土保持学报,2003,10,(2):96-100.
[3]王建力,王勇,师玉娥.白龙江流域全新世泥石流与环境演变的初步研究[J].西南师范大学学报,2000.25(4):452-456.
[4]Wintle A G,Huntley D J.Thennoluminescence dating of a deep-sea sediment core[J].Nature,1979,279:710-712.
[5]Wintle A G,Huntley D J.Thennoluminescence dating of sediments[J].Quaternary Science Reviews,1982,1(1):31-53.
[6]卢演俦,张景昭,赵华.第四纪沉积物热释光测年中古剂量的测定方法[J].核技术,1991,14(2):109-113.
[7]Sanda Balescu,Michel Lamothe.Comparison of TL and IRSL age estimates of feldspar coarse grains from waterlain sediments[J].Quaternary Science Reviews,1994,13(5-7):437-444.
[8]David M.Price.TL dating of fluvial quartz sands:a comparison of ages obtained at 325℃and 375℃[J].Ancient TL,1994,12(2):20-23.
[9]孙继敏,尹功明,陈杰,等.榆林剖面的热释光测年及其对这一地区干旱事件的讨论[J].中国沙漠,1997,17(1):1-8.
[10]Oczkowski H L,Pizegietka K R.TL dating of young Aeolian deposits from kepa kujawska[J].Radiation Measurements,1998,29:435-439.
[11]何友兵,魏明建,刘超,等.释光技术在泥石流标样制作中的应用[J].原子能科学技术,2010,44(增刊):486-491.
[12]Pawel Zielinski,Robert J,Sokolowski,et al.Stratigraphic position of fluvial and aeolian deposits in the Zabinko site(W Poland)based on TL dating[R].2011,38:64-71.
[13]Ye Yuguang,Diao Shaobo,He Jie,et al.ESR dating studies of palaeo-debris-flow deposits in Dong-chuan,Yunnan province,China[J].Quaternary Geochronology,1998,17:1073-1076.
[14]况明生,张远瞩,谢世友,等.云南小江流域第四纪洪积—泥石流沉积的年代与地层划分[J].西南师范大学学报:自然科学版,2002,27(6):974-980.
[15]Chen Jian,Dai Fuchu,Yao Xin.Holocene debrisflow deposits and their implications on the climate in the upper Jinsha River valley,China[J].Geomorphology,2008,93(3-4):493-500.
[16]魏明建,葛永刚,刘兆文,等.泥石流堆积物质释光退火机制研究进展[J].山地学报,2008,26(4):433-438.
[17]赵秋月,魏明建,周锐,等.云南东川地区达朵台地泥石流释光测年研究[J].核电子学与探测技术,2012,32(9):1108-1111.
[18]Adamiec,G.,M.J.Aitken.Dose-rate conversion factors:update[J].Ancient TL,1998,16(2):37-50.
[19]崔之久,冯金良.东川蒋家沟泥石流沉积亚相组合特征[J].水土保持研究,2001,8(2):2-6.
[20]王维达.中国热释光与电子自旋共振测定年代研究[M].北京:中国计量出版社,1997:156-157.
[21]Winter A G,Przegietka K R.TL dating of young Aeolian deposits from kepa kujawska[J].Radiation Measurements,1998,29(3):435-439.
[22]Wallinga,J..Optically stimulated luminescenc e dating of fluvial deposits:a review[J].Boreas,2002,31(4):303-322.
[23]刘英俊,曹励明,李兆麟,等.元素地球化学[M].北京:科学出版社,1984:47-48,223-224.
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