| 四川黄龙大湾-张家沟钙华沉积剖面的古气候记录研究 |
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| 引用本文：王华,杨更,覃嘉铭,郭建强,曹俊.2007.四川黄龙大湾-张家沟钙华沉积剖面的古气候记录研究[J].地球学报,28(5):469-474. |
| DOI：10.3975/cagsb.2007.05.08 |
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| 基金项目:四川省地矿局区调队生态所科研项目 |
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| 中文摘要:本文通过对黄龙景区大湾张家沟钙华剖面的系统研究,确认大湾张家沟14.0～85.0 ka B.P.钙华剖面的沉积层序,该剖面不是自下而上由老到新的正常层序,而可能是多期次(最少两期)沉积形成的.通过钙华氧碳同位素分析重建了钙华沉积过程中环境的变化:在钙华剖面形成的早期,夏季风强盛,气温较高,夏半年降水较多;在钙华形成的中晚期,气候干冷且变化较大.最后,依据钙华的沉积特征和年代学数据,初步探讨了该区钙华的沉积模式. |
| 中文关键词:钙华 年代学 碳氧同位素 古气候 黄龙 |
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| Records of Paleoclimate Changes Based on the Dawan-Zhangjiagou Travertine Deposition Profile in Huanglong, Sichuan |
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| Abstract:The 14.0~85.0 ka B.P.deposition sequence along the Dawan-Zhangjiagou travertine profile in Huanglong was confirmed by a systematic investigation there.Not assuming the natural order that changes from bottom to top and from old to new,the travertine profile results probably from multi-stage deposition(at least two stages).Based on an oxygen-carbon stable isotope analysis,the authors reconstructed the palaeoclimate changes in the process of deposition.At the early stage of the travertine profile formation,the summer monsoon was powerful,the temperature was relatively high,and the precipitation was abundant in the summer season;at the middle stage and the last stage,the climate was dry,cold,and liable to change.According to deposition characteristics and chronological data of the travertine,a model for travertine deposition in this area was tentatively constructed. |
| keywords:travertine chronology oxygen-carbon isotope paleo-climate Huanglong |
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