An attempt at determining D<sub>e</sub>s of glacial sediments using different luminescence methods

OU Xianjiao1; 2 LAI Zhongping2 ZENG Lanhua1 1

doi:10.11889/j.0253-3219.2013.hjs.36.020207

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An attempt at determining D_es of glacial sediments using different luminescence methods

更新时间：2021-06-03

- An attempt at determining D_es of glacial sediments using different luminescence methods
- NUCLEAR TECHNIQUES Vol. 36, Issue 2, Article number: 020207(2013)
- 作者机构：
  
  1. 嘉应学院地理科学与旅游学院
  2. 中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2013.hjs.36.020207
  CLC： P343.6
- Published：2013
- 稿件说明：
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[1]欧先交,赖忠平,曾兰华.不同释光方法测试冰川沉积物等效剂量的尝试[J].核技术,2013,36(02):38-43.

OU Xianjiao1, 2 LAI Zhongping2 ZENG Lanhua1 1. An attempt at determining D_es of glacial sediments using different luminescence methods[J]. Nuclear techniques, 2013, 36(2): 020207
[1]欧先交,赖忠平,曾兰华.不同释光方法测试冰川沉积物等效剂量的尝试[J].核技术,2013,36(02):38-43. DOI： 10.11889/j.0253-3219.2013.hjs.36.020207.

OU Xianjiao1, 2 LAI Zhongping2 ZENG Lanhua1 1. An attempt at determining D_es of glacial sediments using different luminescence methods[J]. Nuclear techniques, 2013, 36(2): 020207 DOI： 10.11889/j.0253-3219.2013.hjs.36.020207.

摘要

在青藏高原东部硬普沟采集6个冰川沉积光释光测年样品（2个现代样、3个新冰期和1个末次冰期样品）

运用SAR结合SGC技术

采用石英大测片、小测片BSL以及多矿物IRSL等3种方法进行了等效剂量（De）的测试

SAR和SGC技术测得的De值相近。3种方法的测试结果表明

De值IRSL>大测片BSL>小测片BSL。多矿物IRSL测得的De值比石英BSL偏高

表明长石比石英较难晒退

不适于该地冰川沉积测年。石英大测片适于晒退较好的样品。该地石英的释光敏感性较低

小测片的测试情况不理想

且不能完全区分不同晒退程度的颗粒。对于年代较老的、较明亮的冰川沉积样品

石英小测片甚至单颗粒技术可能是可行的。今后需要更多研究如何应对释光敏感性低的样品的测试问题。

Abstract

Background: Absolute dating is the key technical issue of Quaternary glacial research.Optically stimulated luminescence（OSL） has been increasingly applied to Quaternary glacial dating in recent years.However

problems such as insufficient bleaching

low luminescence sensitivity

high thermal transfer effect

etc

still remain.Purpose: In order to investigate the applicability of equivalent dose（De） determination of glacial sediments by different OSL methods

six samples were collected from the Yingpu Valley of eastern Qinghai-Tibetan Plateau（two samples from modern glacial sediments

three from moraines and glacial terrace attributed to Neoglacial and one from a moraine attributed to the last glaciation）.Methods: The Des were determined by SAR combined SGC technique

using three methods: quartz large aliquot（6 mm） BSL

small aliquot（2/3 mm） BSL and polymineral IRSL.Results: Des determined by SGC are consistent with Des determined by SAR protocol.Comparison of three methods shows that IRSL De>large aliquot BSL De>small aliquot BSL De.Des of polymineral IRSL are obviously higher than quartz BSL.Conclusions: It is obviously that feldspar is more difficult to reset than quartz

thus is not suitable for dating glacial sediments in this region.Quartz large aliquot method is suitable for well bleached glacial samples.Due to the low luminescence sensitivity of quartz

small aliquot method showed poor luminescence characteristics.Moreover

this method cannot distinguish the poor bleached grains in this measurement.However

it is possible that quartz small aliquot

even single grain method could be used to date older or brighter glacial samples.More works are required to solve the problems we have encountered in dating low sensitivity glacial sediments.

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An attempt at determining Des of glacial sediments using different luminescence methods

DOI：10.11889/j.0253-3219.2013.hjs.36.020207

摘要

Abstract

关键词

Keywords

references

An attempt at determining D_es of glacial sediments using different luminescence methods