青藏高原中部色林错湖泊沉积物色度反映末次冰盛期以来区域古气候演化

doi:10.12118/j.issn.1000-6060.2019.03.11

干旱区地理 ›› 2019, Vol. 42 ›› Issue (3): 551-558.doi: 10.12118/j.issn.1000-6060.2019.03.11

青藏高原中部色林错湖泊沉积物色度反映末次冰盛期以来区域古气候演化

杜丁丁¹， Muhammad Saleem Mughal²， Dembele Blaise²，张成君²

（1 东华理工大学地球科学学院，江西南昌 330013；2 兰州大学地质科学与矿产资源学院；甘肃省西部矿产资源重点实验室，甘肃兰州 730000）

收稿日期:2018-10-19 修回日期:2019-02-15 出版日期:2019-05-25 发布日期:2019-05-20
通讯作者: 张成君，男，博导，教授，主要研究方向环境地球化学. E-mail: cjzhang@lzu.edu.cn
作者简介:杜丁丁(1988-)，男，博士，讲师，研究方向古环境地球化学. E-mail: dudd15@lzu.edu.cn
基金资助:
国家自然科学基金项目(41173015, 41571177)；中央高校基本科研业务费专项资金资助(862457, lzujbky-2017-it26)

Paleoclimatic changes reflected by diffuse reflectance spectroscopy since LastGlacial Maximum from Selin Co Lake sediments,central Qinghai-Tibetan Plateau

DU Dingding¹, Muhammad Saleem Mughal², Dembele Blaise², ZHANG Chengjun²

(1 East China University of Technology,Nanchang 330013,Jiangxi,China; 2 School of Earth Sciences & Mineral Resources,Lanzhou University; Key Laboratory of Western China’s Mineral Resources of Gansu Province,Lanzhou 730001,Gansu,China)

Received:2018-10-19 Revised:2019-02-15 Online:2019-05-25 Published:2019-05-20

摘要/Abstract

摘要： 色林错湖位于青藏高原内部，是西藏第一大咸水内陆湖。研究区剖面选自色林错第三湖泊阶地，利用常用气候替代指标色度，结合粒度、碳酸盐含量［CaCO³（%）］、矿物分析和全有机质（TOC）等进行对比分析，同时采用¹⁴C测年方法对剖面进行准确的年代划分，初步探讨了末次冰盛期以来色林错湖泊沉积物色度增强机制的差异性。研究表明： a^*、b^*与中粗粒砂、磁化率具有较好的相关性；亮度L^*与CaCO³（%）具较好相关性；因而沉积物色度变化可反应区域古气候变化。同时对湖泊沉积物矿物分析发现，影响色度变化的制色矿物主要是针铁矿，且以还原环境为主。红度a^*高值与亮度L^*低值对应气候暖湿气候环境，沉积物粒度较粗，碳酸盐含量低，有机质含量高，磁化率较高值；反之，红度a^*低值，L^*高值，粒度较细，碳酸盐含量高，有机质含量低，磁化率低值，对应干冷气候。在17.4～15.5 cal ka BP阶段，对应干冷的气候特点；在15.5～10.4 cal ka BP阶段，对应温暖湿润的气候；在10.4～5.2 cal ka BP阶段，整体属于温暖湿润的气候特点；其中，在9.7～9.4 cal ka BP和8.75～8.5 cal ka BP为两个重要的冷事件，属于干湿的气候特点；在5.2～1.2 cal ka BP阶段，反映了干冷的气候特征；在4.3～4.0 cal ka BP，3.3～3.0 cal ka BP和2.4～1.75 cal ka BP，反映了干旱温暖的气候特点；在1.2 cal ka BP以后，色林错湖湖水迅速下降。

关键词: 色度, 粒度, 古气候环境, 色林错湖泊

Abstract: The Selin Co Lake is located in the central Qinghai Tibetan Plateau,China,which is a sensitive region to climate. Meanwhile,the area is less influenced by human activities.In recent years,the region became a hotspot for the paleoenvironmental research community.In this paper,the profile is selected in the third terrace of the lakeshore and 122 samples were collected there.By using ¹⁴C dating method,we get the exact age of the profile.The combination of many different methods,such as TOC,Xray diffraction (XRD),CaCO³ (%),magnetic susceptibility and grain size,were used to investigate the paleo environment.Three components were considered in this investigation including red (a^*),yellow (b^*) and brightness (L^*).The a^* and b^* are mainly related to the value of goethite and the a^* in sediment is primarily related to wet warm climate,which can be used to monitor paleoclimatic changes in the area.The L^* has a good correlation with TOC and CaCO³(%); and almost has correlation with magnetic susceptibility and grain size.If the grain size of the lake sediment became coarser,magnetic susceptibility was bigger,the organic content went higher,and the CaCO³(%) got decreased,all these indicated the climate was in the warm wet condition which was reflected by a higher a^* value and a lower L^* value; otherwise,the climate was in the cold dry condition which was reflected by a lower a^* value and a higher L^* value.Therefore,the paleoclimatic changes were divided into 5 stages: The cold dry climatic period from 13.33 to 12.23 ka BP,the significant cold dry climatic period from 12.23 to 10.07 ka BP when the Younger Dryas event occurred,the Holocene Megathermal period from 10.68 to 8.70 ka BP when the values of a^* and b^* kept higher and the value of L^* sustained a dropping trend, the warm wet climatic period from 8.70 to 3.93 ka BP and the cold dry climatic period from 3.93 to 0 ka BP. The result was very similar to the monsoon changes in Qinghai Tibetan Plateau.

Key words: Hue, grain size, paleoclimate and paleo environment, Selin Co Lake

杜丁丁, Muhammad Saleem Mughal, Dembele Blaise, 张成君. 青藏高原中部色林错湖泊沉积物色度反映末次冰盛期以来区域古气候演化[J]. 干旱区地理, 2019, 42(3): 551-558.

DU Dingding, Muhammad Saleem Mughal, Dembele Blaise, ZHANG Chengjun. Paleoclimatic changes reflected by diffuse reflectance spectroscopy since LastGlacial Maximum from Selin Co Lake sediments,central Qinghai-Tibetan Plateau[J]. Arid Land Geography, 2019, 42(3): 551-558.

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青藏高原中部色林错湖泊沉积物色度反映末次冰盛期以来区域古气候演化

Paleoclimatic changes reflected by diffuse reflectance spectroscopy since LastGlacial Maximum from Selin Co Lake sediments,central Qinghai-Tibetan Plateau

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