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青藏高原洞穴次生方解石的裂变径迹年代及地貌学意义
引用本文:高全洲,崔之久,刘耕年,洪云,伍永秋,张叶春,陈怀录.青藏高原洞穴次生方解石的裂变径迹年代及地貌学意义[J].海洋地质与第四纪地质,2000,20(3):61-65.
作者姓名:高全洲  崔之久  刘耕年  洪云  伍永秋  张叶春  陈怀录
作者单位:1. 中山大学,城市与资源规划系,广州,510275;北京大学,城市与环境学系,北京,100871
2. 北京大学,城市与环境学系,北京,100871
3. 兰州大学,地理科学系,兰州,730000
基金项目:中国科学院资助项目,49371011;49901002,
摘    要:古岩溶洞穴中残留的次生方解石晶体可以作为裂变径迹测年的材料。通过测定遍及青藏高原的20组洞穴次生方解石晶体的裂变径迹年代,结果表明,晚第三纪青藏高原的古岩溶过程和缓慢构造抬升过程相伴进行,其间大约10MaB.P.、12MaB.P.和19MaB.P.时溶穴次生化学沉积较为发育。由于地表切割程度的差异,晚第三纪岩溶过程在高原南部较为强烈,相对于第四纪期间的强烈抬升来说,高原晚第三纪的抬升速率较为缓慢,

关 键 词:裂变径迹  次生方解石  洞穴  青藏高原  年代
修稿时间:2000-02-18

THE FISSION TRACK AGES OF THE CAVERNOUS RECRYSTALLINE CALCITES IN TIBET PLATEAU AND THEIR GEOMORPHOLOGIC SIGNIFICANCE
GAO Quan-zhou,CUI Zhi-jiu,LIU Geng-nian,HONG Yun,WU Yong-qiu,ZHANG Ye-chun,CHEN Huai-lu.THE FISSION TRACK AGES OF THE CAVERNOUS RECRYSTALLINE CALCITES IN TIBET PLATEAU AND THEIR GEOMORPHOLOGIC SIGNIFICANCE[J].Marine Geology & Quaternary Geology,2000,20(3):61-65.
Authors:GAO Quan-zhou  CUI Zhi-jiu  LIU Geng-nian  HONG Yun  WU Yong-qiu  ZHANG Ye-chun  CHEN Huai-lu
Abstract:The recrystalline calcites in paleokarst caves may be used as fission trace dating material.We got 20 dates of recrystalline calcites in Tibet Plateau paleokarst caves with the method mentioned above,which indicated that the paleokarst process and the uplift process of the plateau happened at the same time in Neogene Period,and that the speleothems developed plentifully during three periods,i.e.around 10 0 MaB.P.,12 0MaB.P.,and 19 0 MaB.P.respectively.The Neogene paleokarst process was more intense in the southern part of the plateau than in the northern part,which was reflected by the difference of the degrees of landscape denudation.The uplift rate of the plateau was much slower in Neogene Period than in Quaternary Period,and the difference between them can be up to two orders of magnitude.
Keywords:fission  tracks  recrystalline  calcites  paleokarst  caves  Tibet  Plateau
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