| 藏北申扎羊湖河谷140ka B.P.以来古环境的初步研究 |
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| 引用本文： | 刘爱民, 喻建新, 贺永忠, 卢定彪, 牟世勇, 岳龙, 杨家禄. 藏北申扎羊湖河谷140ka B.P.以来古环境的初步研究[J]. 第四纪研究, 2003, 23(1): 83-91. |
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| 作者姓名： | 刘爱民 喻建新 贺永忠 卢定彪 牟世勇 岳龙 杨家禄 |
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| 作者单位： | ①贵州省地质调查院,贵阳,550005;; ②中国地质大学,武汉,430074 |
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| 基金项目： | 中国地质调查局大调查项目 (批准号 :J4 5C0 0 4 0 0 1和I4 5C0 0 10 0 1的 1∶2 50 0 0 0区域地质调查 )资助 |
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| 摘 要： | 通过对藏北羊湖河谷第四纪沉积成分、地貌、年龄值、孢粉和氧化物等的测试、研究,确定了本区140kaB.P.以来沉积序列和1个河流阶地、3个河湖积台地的地貌状况,并得到140kaB.P.以来本区至少经历了4个半干-湿气候旋回,目前正处于干旱期.同时通过不同时期的阶地、台地的不同高程使我们得以了解地壳相对抬升趋势,从98.5kaB.P.以来地壳抬升速率为2.21mm/a,总体显示抬升速率低的特征.
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| 关 键 词： | 羊湖 140ka B.P.以来 沉积 古环境演变 地壳抬升 |
| 收稿时间： | 2002-09-30 |
| 修稿时间： | 2002-09-30 |
ENVIRONMENTAL CHANGES IN THE YANG LAKE AREA OF SHENGZHA COUNTY, NORTH TIBET SINCE 140ka B.P. |
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| Liu Aimin, Yu Jianxin He Yongzhong, Lu Dingbiao, Mu Shiyong, Yue Long, Yang Jialu, . ENVIRONMENTAL CHANGES IN THE YANG LAKE AREA OF SHENGZHA COUNTY, NORTH TIBET SINCE 140ka B.P.[J]. Quaternary Sciences, 2003, 23(1): 83-91. |
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| Authors: | Liu Aimin Yu Jianxin He Yongzhong Lu Dingbiao Mu Shiyong Yue Long Yang Jialu |
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| Affiliation: | ①Faculty of Regional Geological Survey, Guizhou 550005;; ②Faculty of Earth Science, China University of Geosciences, Wuhan 430074 |
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| Abstract: | In the Yang Lake area of North Tibet, a sedimentary sequence since 140ka B.P. was established on the basis of sediment components, geomorphic features, ages, sporapollen, and oxides, and at the same time 1 terrace and 3 fluviolacustrine platforms were recognized. This area at last had 4.5 climate cycles, shifted from arid to humid and is now in an arid period. The crust uplift rate there was 2.21 mm/a since 98.5ka B.P., a relatively low rate. |
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| Keywords: | Yang Lake area 140ka B.P. sedimentary sequence paleoenvironmental change crust uplift |
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