汉江上游郧县庹家湾剖面光释光测年及意义

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

摘要/Abstract

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

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

中图分类号:

P531

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.

Zhang Wentong, Pang Jiangli, Huang Chunchang, Zhou Yali, Zha Xiaochun, Cui Tianyu, Wang Haiyan, Yang Dan. OSL Dating of TJW Section in the Upper Hanjiang River Valley and Its Environmental Significance[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(5): 885-892.

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