汉江上游郧县庹家湾剖面光释光测年及意义

张文桐; 庞奖励; 黄春长; 周亚利; 查小春; 崔天宇; 王海燕; 杨丹

doi:10.7522/j.issn.1000-694X.2016.00100

中国沙漠 >

2017 , Vol. 37 >Issue 5: 885 - 892

DOI: https://doi.org/10.7522/j.issn.1000-694X.2016.00100

古气候与环境演变

汉江上游郧县庹家湾剖面光释光测年及意义

张文桐 ,
庞奖励 ,
黄春长 ,
周亚利 ,
查小春 ,
崔天宇 ,
王海燕 ,
杨丹

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陕西师范大学旅游与环境学院, 陕西西安 710062

张文桐(1991-),男,山东淄博人,硕士研究生,研究方向为土地利用和气候变化。E-mail:978696657@qq.com

收稿日期: 2016-06-13

修回日期: 2016-07-22

网络出版日期: 2017-09-20

基金资助

国家自然科学基金项目（41271108，41371029）；国家社会科学基金项目（14BZS070）；中央高校基本科研业务费专项资金项目（201601006）

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OSL Dating of TJW Section in the Upper Hanjiang River Valley and Its Environmental Significance

Zhang Wentong ,
Pang Jiangli ,
Huang Chunchang ,
Zhou Yali ,
Zha Xiaochun ,
Cui Tianyu ,
Wang Haiyan ,
Yang Dan

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College of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China

Received date: 2016-06-13

Revised date: 2016-07-22

Online published: 2017-09-20

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摘要

在野外考察基础上选择湖北郧县庹家湾剖面为研究对象。在对磁化率和粒度进行分析的同时，用单片再生剂量法进行了光释光测年（OSL）地层断代。OSL测年数据显示：剖面样品年龄处在55.11~13.57 ka BP，且与地层深度呈现出良好的对应关系，此剖面为黄土风化堆积形成。黏粒含量、黏粒/粉砂值以及磁化率值等气候替代性指标数值在马兰黄土层228~260 cm和294~370 cm深度明显高于典型马兰黄土（L₁），具有明显的成壤特征，通过OSL测年数据判断时间为27.26~21.59 ka BP，说明在晚更新世时期气候并非持续稳定的寒冷干旱，而是具有一定的波动，在此期间气候相对温暖湿润，而且此次气候事件在黄土高原地区其他沉积记录中也有良好记录。

关键词： 汉江; 光释光测年; 气候变暖; 弱古土壤

本文引用格式

张文桐 , 庞奖励 , 黄春长 , 周亚利 , 查小春 , 崔天宇 , 王海燕 , 杨丹 . 汉江上游郧县庹家湾剖面光释光测年及意义[J]. 中国沙漠, 2017 , 37(5) : 885 -892 . DOI: 10.7522/j.issn.1000-694X.2016.00100

Abstract

On the basis of field investigations along the upper Hangjiang River valley, a typical loess-soil section was found at the Tuojiawan (TJW). Magnetic susceptibility and particle-size distribution were measured in laboratory. OSL ages were measured by using the quartz single aliquot regenerative-dose protocol. The OSL results show that the optical ages of these samples ranged in 55.11-13.57 ka BP, showing a good relation with the depth in the TJW profile. It indicated that the profile was formed by loess weathering and accumulation. The content of clay, clay/coarse silt ratio, magnetic susceptibility in 228-260 cm and 294-370 cm were higher than those in Malan loess. The weathering intensity of this depth was obviously higher than that of Malan loess, close to the palaeosol (S₀), belongs to the weak palaeosol (L₁-S₁ and L₁-S₂). The age range of L₁-S₁ and L₁-S₂ was 27.26-21.59 ka BP. The change of the indexes showed the climate and pedogenic environment changed since Pleistocene. It indicated there was a short time of warm and wet in the cold and arid glacial period (27.5-21.5 ka BP), and the southeast monsoon gradually intensified during the early Holocene periods with the strongest monsoon in the mid-Holocene.

Key words： Hanjiang River; OSL dating; climate change; weak palaeosol

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