摘要
汉中天坑群是在我国32°N湿润热带-亚热带岩溶地貌区北界首次发现的岩溶地质景观,该区域的洞穴石笋对于研究亚洲季风区古气候变化具有重要科学价值.利用陕西汉中天坑群地洞河溶洞的DDH-B15石笋开展高精度的U/Th定年和XRF微量元素扫描分析,重建该区域过去35000-13000yr BP的水文气候变化.XRF扫描获取的Ba/Ca、Sr/Ca、U/Ca等元素比值和V、Mn、Cr、Cu等元素离子计数记录趋势较为一致,并且与葫芦洞石笋δ18O记录的亚洲季风变化具有很强的可对比性,大致标定了H1、H2、H3三次Heinrich事件,反应汉中天坑群区域水文气候变化可能受到北半球高纬度地区的影响.
Hanzhong Tiankeng Group is the first karst geological landscape found in the northern boundary of Chinese 32°N humid tropical-subtropical karst geomorphic region.Cave stalagmites in this region have important scientific value for studying the paleoclimate change in Asian monsoon region.DDH-B15 stalagmite from Didonghe cave in Hanzhong,Shaanxi province is used to carry out high-precision U/Th dating and XRF trace element scanning analysis to reconstruct the past 35,000-13,000 yr BP regional hydrological and climatic changes.The ratios of Ba/Ca,Sr/Ca,U/Ca obtained by XRF scanning are consistent with the recording trends of ion counts of V,Mn,Cr,Cu,and have strong comparability with the Asian monsoon changes recorded by stalagmiteδ18 O from Hulu Cave.There are three Heinrich events of H1,H2 and H3 roughly calibrated,reflecting that the regional hydrological and climatic changes of Hanzhong tiankeng group may be affected by high latitudes in the northern hemisphere.
作者
陈清敏
洪增林
罗乾周
唐力
王鹏
胡义
王研
崔娜
CHEN Qing-min;HONG Zeng-lin;LUO Qian-zhou;TANG Li;WANG Peng;HU Yi;WAG Yan;CUI Na(Shaanxi Geological Survey Experimental Center,Shaanxi Institute of Geological Survey,Xi’an 710054,China;Shaanxi Institute of Geological Survey,Xi’an 710054,China;Shaanxi Mineral Resources and Geological Survey,Shaanxi Institute of Geological Survey,Xi’an 710068,China;Post-Doctoral Scientific research workstation of Shaanxi Institute of Geological Survey,Xi’an 710054,China;International Research BaseofHanzhongTiankeng Group,Xi’an 710068,China;Shaanxi Geological Science and Technology Center,Xi’an 710054,China)
出处
《西安文理学院学报（自然科学版）》
2020年第3期92-97,102,共7页
Journal of Xi’an University(Natural Science Edition)
基金
陕西省重点研发计划项目(2018ZDXM-SF-100)
陕西省公益性地勘专项项目(201916)
陕西省科协企业创新争先青年人才托举计划项目(20180316)共同资助。
