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查格勒布鲁剖面CGS3a层段主元素记录的巴丹吉林沙漠35 000~25 000 a B. P.季风环境变化
引用本文:郭亿华,李保生,牛东风,杨艺,温小浩,司月君.查格勒布鲁剖面CGS3a层段主元素记录的巴丹吉林沙漠35 000~25 000 a B. P.季风环境变化[J].地理科学,2016,36(6):926-934.
作者姓名:郭亿华  李保生  牛东风  杨艺  温小浩  司月君
作者单位:1.广州地理研究所/广东省地理空间信息技术与应用公共实验室,广东 广州 510070
2.华南师范大学地理科学学院,广东 广州 510631
3.中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西 西安 710061
4.地质出版社,北京 100083
5.广西师范学院地理科学与规划学院,广西 南宁530001
基金项目:国家自然科学基金重大项目(41290250)国家自然科学基金 (41471159)资助
摘    要:对巴丹吉林沙漠东南缘查格勒布鲁剖面该层段的CGS3a层段(Chagelebulu Section 3a)139个样品的主元素——SiO2、Al2O3、TOFE(Fe2O3+FeO)进行分析,划分出与地层旋回对应的5.5个化学元素旋回。研究认为:沙丘砂和黄土中SiO2呈现的峰和Al2O3、TOFE、(TOFE+Al2O3)/SiO2和CIA呈现的谷是类似于现代干冷的冬季风在过去多次作用的结果,而嗣后的湖相SiO2呈现的谷和Al2O3、TOFE、(TOFE+Al2O3)/SiO2和CIA的呈现的峰是类似于现代暖湿的夏季风在过去多次作用的结果。即35 000~25 000 a B. P.该沙漠经历了5次冬季风和6次夏季风交替的气候波动,这些气候事件与GRIP冰芯氧同位素记录的D/O(Dansgaard/Oeschger)事件相对应,Heinrich事件也在其中有很好体现。CGS3a层段所记录的千年尺度的气候波动可能是受到了北大西洋气候突变的影响。

关 键 词:巴丹吉林沙漠  查格勒布鲁剖面  CGS3a层段  主元素  季风环境变化  
收稿时间:2015-03-15
修稿时间:2015-12-10

East Asian Monsoon Variations from Records of Primary Chemical Elements on Millennium Scale in Badain Jaran Desert of China During 35 000-25 000 a B.P.
Yihua Guo,Baosheng Li,Dongfeng Niu,Yi Yang,Xiaohao Wen,Yuejun Si.East Asian Monsoon Variations from Records of Primary Chemical Elements on Millennium Scale in Badain Jaran Desert of China During 35 000-25 000 a B.P.[J].Scientia Geographica Sinica,2016,36(6):926-934.
Authors:Yihua Guo  Baosheng Li  Dongfeng Niu  Yi Yang  Xiaohao Wen  Yuejun Si
Abstract:The CGS3a segment of the Chagelebulu section in the southeastern of Badain Jaran Desert, records five and a half sedimentary cycles consisting of alternations between dune sands or loess and overlying fluviolacustrine during 35 000-25 000 a B.P. Based on the analysis of primary chemical elements (139 samples)—SiO2, Al2O3, TOFE(Fe2O3+FeO), we found that:1) The variation of the primary chemical element content shows five and a half chemical element cycles, which are approximately consistent with the sedimentary cycles. 2) Among SiO2, Al2O3, TOFE, (TOFE+Al2O3)/SiO2 and CIA, SiO2 has the highest content in the CGS3a (range: 44.98%-90.02%, average: 65.96%), followed by Al2O3 (range: 5.17%-15.37%, average: 11.87%), and then TOFE (range: 1.40%-6.90%, average: 4.19%), (TOFE+Al2O3)/SiO2(range: 0.07 -0.47, average:0.27) and CIA(range: 39.66-68.26, average: 58.97). 3) The contents of SiO2, Al2O3, and TOFE significantly differ among the different sedimentary facies. The average SiO2 content is higher in the dune sands than in the fluviolacustrine and loess, whereas the average Al2O3, TOFE, (TOFE+Al2O3)/SiO2 and CIA contents are higher in the fluviolacustrine and loess than in the dune sands. This study suggests that the peaks of SiO2 contents and the valleys of Al2O3, TOFE, (TOFE+Al2O3)/SiO2, and CIA contents in the dune sands and loess represent the dominant periods of East Asian winter monsoon, the valleys of SiO2 contents and the peaks of Al2O3, TOFE, (TOFE+Al2O3)/SiO2, and CIA contents in the fluviolacustrine reflect the dominant periods of East Asian summer monsoon. Therefore, we suggest that the CGS3a segment experienced at least five cold-dry climates and six warm-humid climates during 35 000-25 000 a B.P. Of these, the warm climate fluctuations (23LS, 25LS, 27LS, 29LS, 31LS, 33LS) correspond well to the Dansgaard-Oeschger events (D/O3-D/O8, ie, 25 000 a B.P., 26 000 a B.P., 29 000 a B.P., 31 000 a B.P., 32 000 a B.P., 35 000 a B.P.) recorded in the Greenland Ice Core Project (GRIP). Moreover, the cold period (28D, 30 600 a B.P. ± 2 900 a B.P.) correlates well with the Heinrich Event H3 (approximately between 29 000 a B.P. and 31 000 a B.P.). The abrupt changes of East Asian monsoon recorded in the CGS3a segment correspond well to Dansgaard-Oeschger climate fluctuations and Heinrich events, whicha indicate that the East Asian monsoon was probably affected by the climate changes in the North Atlantic. This study offers significant geological evidence to support the East Asian monsoonal millennial scale climatic fluctuations, which is the regional response to the millennial scale climate changes from the North Hemisphere in China’s deserts during 35 000-25 000 a B.P.
Keywords:Badain Jaran Desert  Chagelebulu section  CGS3a segment  primary chemical elements  East Asian monsoon variations on millennium scale  
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