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Red thermal luminescence dating of terrace deposits using a single quartz grain

使用单个石英颗粒对阶地沉积物进行红色热释光测年

基本信息

批准号：
18540448
负责人：
GANZAWA Yoshihiro
金额：
$ 2.37万
依托单位：
Hokkaido University of Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18540448/
关键词：
Red thermoluminescence single gain division method terrace deposits quartz OIS5e OIS7 single aliquot regenerative doses (SAR)赤色熱蛍光年代測定石英段丘堆積層

项目摘要

Red thermoluminescence (RTL) dating of terrace deposits in northern Japan was evaluated from a single quartz grain. Because of the strong RTL resistance property of quartzes to daylight bleaching, previous methods determined the apparent equivalent dose (Ap-De) and the residual level (Rl) independently using two multigrain aliquots. We devised a new method, a single gain division method, to obtain the Ap-De and RI from divided fragments of a single grain, which were formed by using a hammer and nail. The newly developed RTL equipment enabled us successfully to detect minimum RTL signals (about 20Gy) from a 400μm size single quartz grain. Two samples of terrace deposits were used to evaluate the practicability of the new method. The RTL ages of 241±20ka and 113ka±17ka, which were determined by minimum equivalent doses (De) deduced from the single aliquot regenerative doses (SAR) Ap-De and SAR RI-De agreed well with the eras of OIS7 and OIS5e, respectively, estimated by geological evidence.

对日本北方阶地沉积物的单个石英颗粒进行了红色热释光（RTL）测年。由于石英对日光漂白的强RTL抗性，先前的方法使用两个多颗粒等分试样独立地确定表观等效剂量（Ap-De）和残留水平（RI）。我们设计了一种新的方法，一个单一的增益划分方法，获得的Ap-De和RI从一个单一的颗粒，这是通过使用锤子和钉子形成的分割碎片。新研制的RTL装置使我们能够成功地从400μm大小的单个石英颗粒中检测到最小的RTL信号（约20 Gy）。以两个阶地沉积物样品为例，对新方法的实用性进行了评价。由单等分再生剂量（SAR）Ap-De和SAR RI-De推算的最小等效剂量（De）分别得到241± 20 ka和113 ka ± 17 ka的RTL年龄，与地质证据估算的OIS 7和OIS 5e年龄吻合较好。