| 引用本文: | 薛滨,王苏民,吴艳宏,夏威岚,吴敬禄,钱君龙,胡守云,王云飞.若尔盖盆地RM孔揭示的过去14万年古环境.湖泊科学,1999,11(3):206-212. DOI:10.18307/1999.0303 |
| XUE Bin,WANG Su-min,WU Yan-hong,XIA Wei-lan,WU Jin-lu,QIAN Jun-long,HU Shou-yun,WANG Yun-fei.Palaeoenvironmental Reconstruction of Zoige Basin of Eastern Tibetan Plateau During the Past 140 ka. J. Lake Sci.1999,11(3):206-212. DOI:10.18307/1999.0303 |
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| 若尔盖盆地RM孔揭示的过去14万年古环境 |
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薛滨, 王苏民, 吴艳宏, 夏威岚, 吴敬禄, 钱君龙, 胡守云, 王云飞
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中国科学院南京地理与湖泊研究所, 南京 210008
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| 摘要: |
| 根据青藏高原东部若尔盖盆地RM孔湖泊沉积物自生碳酸盐碳氧同位素,碳酸盐含量,木本花粉含量以及有机质含量分析,重建了14万年以来的古气候与古环境过程,结果表明,14万年来有5个气候环境显著变化时期,对应于深海氧同位素5个阶段5阶段对应于未次间期,又可分为5个次级阶段(5a-5e),其中5e又可进一步分为(5e1-5e5),4阶段以来记录了一系列冷事件,文章对RM孔记录与邻区及全球的相关记录进行了对比研究表明,3阶段同样是一个引人注目的时期,气候条件改善明显. |
| 关键词: 若尔盖盆地 湖泊沉积 古气候环境 140kaBP |
| DOI：10.18307/1999.0303 |
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| 基金项目:“八五”国家攀登计划,(KJ－85－07－2);国家科委资助项目 |
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| Palaeoenvironmental Reconstruction of Zoige Basin of Eastern Tibetan Plateau During the Past 140 ka |
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XUE Bin, WANG Su-min, WU Yan-hong, XIA Wei-lan, WU Jin-lu, QIAN Jun-long, HU Shou-yun, WANG Yun-fei
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Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008
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| Abstract: |
| The Tibetan Plateau plays a major role on modern atmospheric circulation of Northern Hemisphere, especially with respect to the Tropical Easterly Jet and monsoon circulation.Understanding the past climate in the plateau, especially during the late Pleistocene when the Tibetan Plateau uplifting accelerated, will be very important.A 310m core(RM) (33°57'N, 102°21'E) collected from the central part of Zoige Basin, east Tibetan Plateau was analyzed.The upper 31m provide a continuous palaeoclimate information in the past 140ka, which is reconstructed on the basis of stable isotope analyses (δl8O and δ13 of authigenic carbonate), content of carbonate, organic matter and pollen, etc.The results reveal significant changes of palaeoenvironmental condition, induced by climate changes and/or local hydrological factors.Five stages are identified.Stage 5(140-82kaBP) equivalent to Last Interglaciation was warm and wet.The primary productivity was high due to the optimum associaton of heat and moisture.5 substages (5a-5e) can be divided, moreover, 5e can be further divided into 5 subordinate substages (5e1-5e5).In the record, 5e is the warmest substage among them, while 5a is the optimum, and 5c is a weakly warm period.A series of cooling events have been recorded since stage 4 (82-l0kaBP).i.e.66, 51.5, 33, 28, 21 kaBP, equivalent to H6, H5, H4, H3, H2 event reported in deep-sea sediment.Comparison study has been done for the RM core record with the other records adjacent and in the world.The result also shows that the stage 3 was a conspiciouvs period, when the climate was very optimum.The basin Was cut off by the Yellow River ca 30kaBP, correspondingly the lacustrine deposits were replaced by fluvial and swamp deposits. |
| Key words: Zoige Basin palaeoenvironment 140 ka |
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