| 察尔汗钻孔介形类记录及其对察尔汗古湖晚更新世高湖面的指示 |
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| 引用本文： | 宋博文,柯学,宋泰忠,张克信,杨文军,张金明,张小瑾.察尔汗钻孔介形类记录及其对察尔汗古湖晚更新世高湖面的指示[J].地质学报,2023,97(10):3168-3179. |
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| 作者姓名： | 宋博文 柯学 宋泰忠 张克信 杨文军 张金明 张小瑾 |
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| 作者单位： | 1. 中国地质大学(武汉)地质调查研究院;2. 中国地质大学(武汉)生物地质与环境地质国家重点实验室;3. 青海省地质调查院;4. 青海省青藏高原北部地质过程与矿产资源重点实验室 |
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| 基金项目： | 中国地质调查局项目（编号DD20221645）；;国家自然科学基金项目（编号42072141）联合资助的成果； |
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| 摘 要： | 察尔汗盐湖作为柴达木盆地第四纪的沉积中心，沉积了巨厚的第四系湖相沉积，其演化历史研究对于揭示柴达木盆地及青藏高原北部第四纪古气候、古环境演变历史具有重要意义。本文在AMS 14C测年的基础上，以察尔汗盐湖晚更新世钻孔(ZK53630-1)岩芯中介形类微体化石为研究对象，通过系统的采样和室内分析，共识别出7属10种。基于分类学研究，识别出2个介形类组合(自下而上):Ilyocypris biplicata-Limnocythere inopinata和Ilyocypris bradyi-Ilyocypris sebeiensis。介形类及其伴生化石均显示察尔汗古湖在距今34～28 ka期间的晚更新世晚期(MIS 3a)主体为淡水—微咸水湖泊，气候温暖湿润，与现今极端干旱的盐湖环境截然不同。
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| 关 键 词： | 介形类群落 察尔汗古湖 柴达木盆地 MIS 3阶段 古环境 |
| 收稿时间： | 2023/3/15 0:00:00 |
| 修稿时间： | 2023/4/10 0:00:00 |
Ostracod records from a drill core in the Qarhan and its implications for Late Pleistocene high lake level in paleo- lake Qarhan |
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| SONG Bowen,KE Xue,SONG Taizhong,ZHANG Kexin,YANG Wenjun,ZHANG Jinming,ZHANG Xiaojin.Ostracod records from a drill core in the Qarhan and its implications for Late Pleistocene high lake level in paleo- lake Qarhan[J].Acta Geologica Sinica,2023,97(10):3168-3179. |
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| Authors: | SONG Bowen KE Xue SONG Taizhong ZHANG Kexin YANG Wenjun ZHANG Jinming ZHANG Xiaojin |
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| Abstract: | The Qarhan salt lake is the depocentre of the Qaidam basin during the Quaternary, with a very thick sequence of lacustrine sediments. Continuous lacustrine sediments provide excellent archives of detailed paleo- environmental data regarding climatic change in the Qaidam basin and northern Tibetan Plateau. In this study, fossil ostracods from the drill core (ZK53630- 1) sediment were analyzed in conjunction with AMS 14C dating. A totalof 10 ostracod species belonging to 7 genera are identified. The ostracod fauna can be subdivided into two assemblages from bottom to top: Ilyocypris biplicata- Limnocythere inopinata and Ilyocypris bradyi- Ilyocypris sebeiensis. The ostracod fauna and associated micro- fossils suggest the existence of a large freshwater to oligohaline lake in the Qarhan area during the Late Pleistocene (MIS 3a, 34~28 ka), coevaled with a warm and humid climate, which was completely different from the present- day hyper- arid salt lake environment. |
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| Keywords: | ostracod fauna paleo- lake Qarhan Qaidam basin MIS 3 paleoenvironment |
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