Records of Paleoclimate Changes Based on the Dawan-Zhangjiagou Travertine Deposition Profile in Huanglong, Sichuan
四川黄龙大湾-张家沟钙华沉积剖面的古气候记录研究

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.