CAJ | 학술논문

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。
유우니석류침적물기록적시간신식대당지역사시기적강수량화기후변화등구유중요적지시의의，선후유일계렬적측년방법재니석류침적물측년중응용，재차기출상상시이용열석광（TL）단편재생제량법（SAR）대운남동천지구체타고니석류퇴적태진행측년。득도해부면상12개양품적등효제량치，채용중자활화분석기술측정각양품U、Th、K함량，산득년제량솔，획득체타태지발육적시간범위위44．4～27．1 ka BP。해태지재형성시기다차수도소강류수적개조작용，치사고금함수솔차이교대、방사성원소U、Th、K적함량수심도변화적상대표준편차야교대（의차위17％、12％화11％），시년제량솔재동일태지내파동교대적중요원인，대년제량솔취산술평균치후소득도적수정년령수심도변화적내부일치성교호。초보연구결과표명열석광단편재생제량법재니석류침적물측년방면구유일정적잠력。
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 correc-tion 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 de -brris flow deposits.