| 罗布泊盐湖晚更新世末期芒硝岩沉积及其古气候意义 |
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| 关键词:Lop Nur saline lake Late Pleistocene mirabilite rock paleoclimate |
| 基金项目:地质调查项目(编号:200010300105); 国家科技攻关305项目专题(编号:2001BA609A-07-15) |
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| Late Pleistocene Mirabilite Deposition in the Lop Nur Saline Lake,Xinjiang, and its Paleoclimate Implications |
| The Lop Nur Saline Lake located in eastern Tarim basin of Xinjiang is probably the largest single saline lake in the world.From middle Pleistocene,Lop Nur Lake evolved into a saline lake environment and glauberite crystallized from brine in the lake until the end of Pleistocene.In the Lop Nur Lake,halite crystallized only during Holocene.Drilling shows that thin layers of mirabilite rocks occur at the top of upper Pleistocene strata.A comparison of strata from drilling holes reveals that the mirabilite layers belong to the contemporaneous sediments.14C-dating shows that the ages of mirabilite layers are from 13.72～16.92 ka,basically consistent with the age(14～22 ka)of the last maximum glacier activity.The authors infer that the annual average atmospheric temperature of Lop Nur area was-2～-3 ℃ at that time.The following conclusion has thus been drawn:the global cold event had impacts on chemical sedimentation of the saline lake;with the ending of a short cold period,the Lop Nur Saline Lake changed into a saline water lake in early Hollocene;since middle Holocene,the lake has converted into a salt lake with the deposition of large amounts of halite. |
| LIU Cheng-lin,JIAO Peng-cheng,CHEN Yong-zhi,WANG Mi-er.2008.Late Pleistocene Mirabilite Deposition in the Lop Nur Saline Lake,Xinjiang, and its Paleoclimate Implications[J].Acta Geoscientica Sinica,29(4):397-404. |
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