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Discovery of Borax-bearing Mirabilite Beds in Dong Co, Northern Tibet, and Its Palaeoclimatic Significance
作者姓名:WEI Lejun  ZHENG Mianping  LIU Xifang  CAI Keqin and NIE Zhen Institute of Mineral Resources  Chinese Academy of Geological Sciences  Beijing China University of Geosciences  Beijing Open Laboratory of Saline Lake Resources & Environment  Chinese Academy of Geological Sciences  Beijing Fei Zhenbi
作者单位:WEI Lejun,ZHENG Mianping,LIU Xifang,CAI Keqin and NIE Zhen Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037 China University of Geosciences,Beijing 100083 Open Laboratory of Saline Lake Resources & Environment,Chinese Academy of Geological Sciences,Beijing 100037 Fei Zhenbi
摘    要:The authors investigated lacustrine chemical sediments on terrace-I of Dong Co-a salt lake in the interior of the northern Tibetan Plateau and firstly discovered borax and a complete sedimentary section with five pure mirabilite beds. According to the sedimentary characteristics of rhythmic layering, palaeotemperatures for the formation of the cold-phase mineral-mirabilite-at the profiles and 14C dating, the authors applied the theory and method of comparative salinology in the study of the history of the palaeoclimate and palaeoenvironment of Dong Co in the early and middle Holocene and drew the conclusion that the salt lake had experienced the following climatic evolution: the warm and moist stage (>8470 a BP and possibly to 10500 a BP)→cold and dry stage (8470-8170 a BP)→warm and moist stage (8170-7590 a BP)→stage of repeated climatic oscillations (7590-7400 a BP, alternation of three dry oscillations and three moist oscillations in a generally cold climatic background)→cold and dry stage (7400-6


Discovery of Borax-bearing Mirabilite Beds in Dong Co, Northern Tibet, and Its Palaeoclimatic Significance
Authors:WEI Lejun  ZHENG Mianping  LIU Xifang  CAI Keqin and NIE Zhen Institute of Mineral Resources  Chinese Academy of Geological Sciences  Beijing China University of Geosciences  Beijing Open Laboratory of Saline Lake Resources & Environment  Chinese Academy of Geological Sciences  Beijing Fei Zhenbi
Abstract:The authors investigated lacustrine chemical sediments on terrace‐I of Dong Co—a salt lake in the interior of the northern Tibetan Plateau and firstly discovered borax and a complete sedimentary section with five pure mirabilite beds. According to the sedimentary characteristics of rhythmic layering, palaeotemperatures for the formation of the cold‐phase mineral—mirabilite—at the profiles and 14C dating, the authors applied the theory and method of comparative salinology in the study of the history of the palaeoclimate and palaeoenvironment of Dong Co in the early and middle Holocene and drew the conclusion that the salt lake had experienced the following climatic evolution: the warm and moist stage (>8470 a BP and possibly to 10500 a BP)→ cold and dry stage (8470–8170 a BP)→ warm and moist stage (8170–7590 a BP)→stage of repeated climatic oscillations (7590–7400 a BP, alternation of three dry oscillations and three moist oscillations in a generally cold climatic background)→cold and dry stage (7400–6940 a BP)→warm and moist stage (6940–6620 a BP)→cold and dry stage (6620–6410 a BP)→warm and moist stage (after 6410 a BP).
Keywords:Dong Co  Tibet  borax-mirabilite layer  Holocene  climatic change
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