不同释光方法测试冰川沉积物等效剂量的尝试

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...

Full description

Saved in:
Bibliographic Details
Published in核技术 Vol. 36; no. 2; pp. 36 - 41
Main Author 欧先交 赖忠平 曾兰华
Format Journal Article
LanguageChinese
Published 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 兰州730000%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 兰州730000%嘉应学院地理科学与旅游学院 梅州514015 2013
嘉应学院地理科学与旅游学院 梅州514015
Subjects
Online AccessGet full text
ISSN0253-3219

Cover

More Information
Summary: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。
Bibliography:OU Xianjiao1'2 LAI Zhongping2 ZENG Lanhua1 1 (School of Geography and Tourism, Jiaying University, Meizhou 514015, China) 2 (State Key Laboratory of Cryosphere Sciences, Cold andArid Regions Environment and Engineering Research Institute Chinese Academy of Sciences, Lanzhou 730000, China)
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 modem glacial sediments, three from moraines and glacial terrace attributed to Neoglacial and one from a moraine attributed to the last glaciation). Methods: The De
ISSN:0253-3219