末次间冰期以来渭南黄土剖面高分辨率古气候时间标尺

王文远; 刘嘉麒; 潘懋; 刘东生

末次间冰期以来渭南黄土剖面高分辨率古气候时间标尺

1.
北京大学地质系, 北京 100871
2.
中国科学院地质研究所, 北京 100029

基金项目:

国家自然科学基金重大资助项目 4929110001

详细信息

作者简介:
王文远, 男, 博士后, 1969年生, 主要从事第四纪地质学研究

中图分类号: P534.63;P532
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- 文章访问数: 3931
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- 被引次数: 0
出版历程
- 收稿日期: 1999-08-31
- 刊出日期: 2000-01-25

RECONSTRUCTION OF THE HIGH RESOLUTION TIMESCALE IN THE WEINAN LOESS SECTION OF THE LATE QUATERNARY

1.
Department of Geology, Peking University, Beijing 100871, China
2.
Institute of Geology, Chinese Academy of Sciences, Beijing 100029, China

摘要

摘要: 利用细颗粒热释光技术对渭南剖面重要地层界线处的7个样品进行了年龄测定, 并在此基础上, 结合已发表数据利用多项式回归方法建立了渭南剖面高分辨率的古气候时间标尺, 其中S0/ L1-1, L1-1/ L1-2, L1-4/ L1-5, L1-5/S1, S1/ L2的界线年龄分别为1.1, 2.5, 5.1, 7.6, 12.8 ka, 除了L1-4/ L1-5的界线年龄与氧同位素3阶段的起始年龄差距较大之外, 它们与SPECMAP深海氧同位素5以上各阶段的界线年龄可进行较好的对比, 而L1 -4/ L1-5的界线年龄与北太平洋风尘记录的氧同位素年龄却有很好的一致性.关键词: 黄土; 热释光; 高分辨率; 时间标尺.
- 黄土 /
- 热释光 /
- 高分辨率 /
- 时间标尺
Abstract: Seven samples of loess and paleosol collected from the major stratigraphic boundaries of the Weinan section, Shaanxi Province, have been dated using the fine-grain TL technique. Based on the TL results and previously ages-published from this section, the polynomial regression methods are applied to developing the high resolution timescale for the Weinan loess section in the Late Quaternary. According to this timescale, the ages of S0/L1-1, L1-1/L1-2, L1-4/L1-5, L1-5/S1 and S1/L2 stratigraphic boundary of Weinan section are 1.1, 2.5, 5.1, 7.6 and 12.8 ka. With exception of the maximum difference between the ages of L1-4/ L1-5 and the ages of 3/4 stage boundary of the deep-sea oxygen isotopes, they are generally consistentwith the ages of 1/2, 2/3, 4/5 and 5/6 stage boundary of the deep-sea oxygen isotopes in the SPECMAP curve.
- loess /
- thermoluminescence dating /
- high resolution /
- timescale

HTML全文

图 1 渭南剖面地层、已发表年龄数据^[1]及其样品采集位置

1.耕作土; 2.古土壤; 3.黄土

Fig. 1. Stratigraphy, ages-published and locations of sampling points of Weinan loess section

下载: 全尺寸图片幻灯片

图 2 第四纪沉积物热释光测年模型^[7]

图中I_o为残留热释光; I_n=I_o+I_d

Fig. 2. Model of thermoluminescence dating of Quaternary sediments

下载: 全尺寸图片幻灯片

图 3 渭南黄土剖面样品WT2热释光实验

a.热释光增光曲线; b.等效剂量的确定; c.“坪法试验”图

Fig. 3. Drawings for TL experiment from the sample WT2 of Weinan loess section

下载: 全尺寸图片幻灯片

图 4 末次间冰期以来渭南黄土剖面年代-深度时间模式

Fig. 4. Depth-age model of the Weinan loess section of Late Quaternary

下载: 全尺寸图片幻灯片

表 1 渭南热释光测年及放射性分析结果

Table 1. Thermoluminescence result from the fine grain and radioactivity data of Weinan loess section

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