| 共和盆地黏土矿物与孢粉记录的末次冰消期以来的气候环境相位差 |
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| 引用本文： | 孙庆峰,程波,赵黎.共和盆地黏土矿物与孢粉记录的末次冰消期以来的气候环境相位差[J].中国沙漠,2014,34(5):1237-1247. |
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| 作者姓名： | 孙庆峰 程波 赵黎 |
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| 作者单位： | 1. 西北师范大学 地理与环境科学学院, 甘肃 兰州 730070;2. 华中师范大学 地理过程分析与模拟湖北省重点实验室, 湖北 武汉 430079 |
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| 基金项目： | 国家自然科学基金项目(41061022,41102112)资助 |
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| 摘 要： | 在青藏高原北缘共和盆地达连海钻取了40.92 m沉积柱，其14C年代有10个控制点，底部年龄最大值为14.5 cal ka BP，沉积柱为末次冰消期以来的湖泊沉积物。在沉积柱中按20 cm/70 a分辨率选出200个样品进行了黏土矿物、粒度、碳酸盐、沉积速率等非生物指标与生物指标的孢粉等多项指标的综合分析。结果表明：末次冰消期以来，达连海沉积柱中非生物指标与生物指标反映的气候和环境变化阶段的显著性不同，反映的气候环境的变化阶段也不尽一致，出现气候环境的相位差。冰消期黏土矿物非生物指标与孢粉生物指标有约1.0~1.2 ka的相位差；早、中全新世黏土矿物反映的气候变化时段较孢粉指标指示的时段滞后约1.0 ka；在晚全新世黏土矿物反映的气候变化较孢粉滞后约0.1 ka。造成黏土矿物和孢粉反映气候环境相位差的原因是孢粉和黏土矿物对气候响应的差异性、黏土矿物和孢粉搬运方式的不同、气候条件及其转换、地貌等多因素的综合影响。
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| 关 键 词： | 共和盆地 黏土矿物 孢粉 气候环境相位差 |
| 收稿时间： | 2013-09-23; |
| 修稿时间： | 2013-11-12 |
Climate and Environment Phase Deviation Recorded by Clay Minerals and Pollen since the Late Deglacial in the Gonghe Basin |
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| Sun Qingfeng,Cheng Bo,Zhao Li.Climate and Environment Phase Deviation Recorded by Clay Minerals and Pollen since the Late Deglacial in the Gonghe Basin[J].Journal of Desert Research,2014,34(5):1237-1247. |
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| Authors: | Sun Qingfeng Cheng Bo Zhao Li |
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| Institution: | 1. College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China;2. Hubei Province Laboratory for Geographic Process Analyzing & Modelling, Central China Normal University, Wuhan 430079, China |
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| Abstract: | A 40.92 m long core was drilled in the Dalianhai (DLH) lake of the Gonghe Basin, Northeast Tibet Plateau. The chronology of the column was established by 14C dating methods on 10 plant remains and its maximum age of the column is 14.5 cal ka BP. The column is lake sediments of the Late Deglacial and Holocene. 200 samples with 70 a resolution were analyzed on clay minerals, pollen, grain size, and carbonate content was done by 1 029 samples with resolution of 15 a, as well sedimentary rate was calculated along the column. These proxies synthetically expressed different distinction and phases to environment and climate since the Late Deglacial. Phase deviation or phase shifts reflected by main proxies, clay minerals and pollen, occurred. The phase shifts had 1.0-1.2 ka in the Late Deglacial, 1.0 ka in the Early Holocene, and 0.1 ka in the Late Holocene, respectively. They were formed and influenced together by several factors, such as the differential reflections of clay mineral and pollen to climate and environment, different transportation ways of clay mineral and pollen, climate alteration and geomorphology, etc. Further detail discussions for their formations mechanism need to be done. |
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| Keywords: | Gonghe Basin clay minerals pollen climate and environment phase deviation |
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