COSMOGENIC ISOTOPE 10Be DATING FOR KUZHAORI MORAINE IN DAOCHENG ICE CAP
-
摘要: 沙鲁里山南端的稻城冰帽在第四纪曾发生过大规模的冰川作用,然而,关于冰川作用的年代数据相对较少。选择稻城冰帽南缘库照日附近的3套冰碛垄进行宇生核素10Be的暴露年代测定,研究结果表明:(1)库照日最老冰碛垄(E)的暴露年代为(714±8.0)~(529±8.0) kaBP,D垄的暴露年代为(121±2.9)~(114±2.9) kaBP,DC垄的暴露年代为(47±1.3)~(43±1.3) kaBP。由于宇生核素暴露年代所反映的是冰川消退时的年代,因此,我们结合深海氧同位素的气候特征以及其他测年数据推断,E垄、D垄、DC垄可能是MIS16、MIS6以及MIS3b阶段冰川作用的产物;(2)冰川退却是一种逐步退却的模式。样品E的两次测验结果比较吻合,表明宇生核素10Be暴露测年方法对冰碛垄形成年代的测定是可靠的,该方法在地貌学和第四纪年代学研究中有着巨大的潜力。Abstract: The Daocheng Ice Cap which is on the southeast of Shaluli Moutain had appeared as a large-scale glacier in Quaternary. Howevrer, there are few dating data available in the study area. In this article, we chosed three samples form the Kuzhaori moraine in the southern margin of Daocheng Ice Cap and used Cosmogenic Isotope 10Be exposure dating methord to date the exposure age of the moraines. It is found that:(1) the exposure time of the oldest moraine at Kuzhaori is 714±8.0~529±8.0 kaBP. The exposure age of D moraine is 121±2.9~114±2.9 kaBP. and the exposure age of DC moraine is 47±1.3~43±1.3 kaBP. Exposure ages give an estimate of the timing of initial glacier retreat, so we can deduce that E moraine, D moraine and DC moraine are the results of glacier advance in MIS 16、MIS 6 and MIS 3b, according to the climate changes deduced from deep-sea oxygen isotope isotopic records and other dating data. (2) The retreat of glacier is a gradual process. We double-Checked the dating data of sample E. It shows that the cosmogenic isotopes dating technique is an effective method in dating moraine samples.
-
Key words:
- cosmogenic radionuclide /
- QuarternaryQuaternary /
- moraine /
- 10Be /
- Daocheng Ice Cap
-
-
[1] Ruddiman W F,F, Kutsbach J E. E. Forceing of the late cenozoic Northern Hemisphere climate by plateau uplift in the southern Asia and American west[J]. Geophysical ReaearchResearch, 1989, 94:18409-18427.
[2] 赵志中, 乔彦松, Shafer Joerg, 等. 青藏高原中东部第四纪冰碛物暴露年龄的测定及意义[J]. 地学前缘, 2006, 13(5):316-320.
[ZHAO Zhizhong, QIAO Yansong, Schfer Joerg, et al. Exposure ages of moraines in the eastern and central Qinghai Tibet plateau and their significance[J]. Earth Science Frontiers, 2006, 13(5):316-320]
[3] 周尚哲, 许刘兵, 崔建新, 等. 沙鲁里山第四纪地貌发育与环境演变[J]. 科学通报, 2004, 49(23):2480-2484.
[ZHOU Shangzhe, XU Liubing, CUI Jianxin, et al. Geomorphologic evolution and environmental changes in the Shaluli Mountain region during the Quaternary[Quaternary[J]. China Science Bulletin, 2004, 49(23):2480-2484.]
[4] 施雅风. 中国第四纪冰川与环境变化[M]. 河北:河北科学技术出版社, 2006:426.[SHI Yafeng. The Quaternary Glaciations and Environmental Variations in China[China[M]. Hebei:Hebei Science and Technology Publishing House, 2006:426.]
[5] 李吉均, 冯兆东, 周尚哲. 横断山第四纪冰川作用遗迹[C]//横断山冰川. 北京:科学出版社, 1996:157-173.[LI Jijun, FENG Zhaodong, ZHOU Shangzhe. The Vestiges of Quaternary Glaciationglaciations in the Hengduan Mountains Region[C]//Glacier in the Hengduan Mountains Region. Beijing:Science Press, 1996:157
-173.]
[6] Wang J, Raisbeck G,Xu X B, et al. In Situ Cosmogenic 10Be dating of the Quaternary glaciations in the southern Mountain Shaluli on the Southeastern Tibetan Plateau[J]. Science in China Series D:Earth Science, 2006, 49(12):1291-1298.
[7] 许刘兵, 周尚哲, 崔建新, 等.稻城冰帽区更新世冰川测年研究[J]. 冰川冻土, 2004, 26(5):528-534.
[XU Liubing, ZHOU Shangzhe, CUI Jianxing, et al. Dating of the Pleistocene Glaciations around the Daocheng Ice Cap[J]. Journal of Glaciology and Geocryology, 2004, 26(5):528-534.]
[8] 郑本兴, 马秋华. 川西稻城古冰帽的地貌特征与冰期探讨[J]. 冰川冻土, 1995, 17(1):23-32.
[ZHEN Benxing, MA Qiuhua. A study on the Geomorphological characteristics and Glaciations in Paleo-Daocheng Ice Cap, Western Sichuan[J]. Journal of Glaciology and Geocryology,1995, 17(1):23-32.]
[9] 李吉均, 姚檀栋, 冯兆东. 稻城古冰帽发育模式[C]//青藏高原研究横断山考察专集(二).北京:北京科学技术出版社, 1986:271.[LI Jijun, YAO Tandong, FENG Zhaodong. The development model of the Daocheng Former Ice Cap[C]//Studies in Qinhai-Xizang(Tibet) Plateau Special Issue of Hengduan Mountains Scientific Expedition(2). Beijing:Beijing Science and Technology Press, 1986:271.
]
[10] [11] Lal D. Cosmic ray labeling of erosion surfaces:in situ nuclide production rates and erosion models[J]. Earth and Planetary Science Letters, 1991, 104:4242439.
[12] Brown E T, Edmond J M, Raisbeck G M, et al. Examination of surface exposure ages of Antarctic moraines using in situ produced 10Be and 26Al[J]. Geochimica et Cosmochimica Acta, 1991,55:2269-2283.
[13] Dunai T J. Scaling factors for production rates of in situ produced cosmogenic nuclides:a critical reevaluation[J]. Earth and Planetary Science Letter, 2000, 176:157-169.
[14] Nishiixumi K, Kohl C P, Arnold J R, et al. Middleton. Cosmic ray produced 10Be and 26Al in Antarctic rocks:exposure and erosion history[J]. Earth and Planetary Science Letter, 1991, 104:440-454.
[15] 徐孝彬, 王建, 陈世涛. 陆面岩石中形成的同位素10Be与26Al的试验室提取方法[J]. 南京师范大学学报, 2003, 26(1):111-115.
[XU Xiaobin, WANG Jian, CHEN Shitao. Samples selection in terrestrial cos-mogenic isotopes dating and extraction of 10Be and 26Al[J]. Journal of Nanjing Normal University (Natural Science), 2003, 26(1):111-115.]
[16] Nishiizumi K. 10Be, 26Al, 36Cl, and 41Ca AMS standards:abstract O16-1[C]//9th Conference on Accelerator Mass Spectrometry, 2002:130.
[17] 王建, Yiou F, Raisbeck G, et al. 利用陆面岩石中生成的宇生同位素重建冰川漂砾运动历史的尝试[J]. 地质学报, 2003, 77(3):407-413.
[WANG Jian, Yiou F, Raisbeck G, et al. Reconstructing the history of drift boulder's movement by using in situ cosmogenic isotopes[J]. Acta Geologica Sinica, 2003, 77(3):407-413.]
[18] [19] Dunne J, Elmore D, Muzikar P. Scaling factors for the rates of production of cosmogenic nuclides for geometric shielding and attenuation at depth on sloped surface[J]. Geomorphology, 1999, 27:3-11.
[20] Balco G, Stone J O, Lifton N A, Dunai T J. A complete and easily accessible means of calculating surface exposure ages or erosion rates from Be-10 and Al-26 measurements[J]. Quaternary Geochronol, 2008, 3:174-195.
[21] 施雅风,李吉均,李炳元,等. 晚新生代青藏高原的隆升与东亚环境变化[J]. 地理学报, 1999, 54(1):12-20.
[SHI Yafeng, LI Jijun, LI Bingyuan, et al. Uplift of the Qinhai-Xizang(Tibetan) Plateau and East Asia Environmental change during Late Cenozoic[J]. Acta Geographica Sinica, 1999, 54(1):12-20.]
[22] 吴锡浩,王富葆,安芷生,等. 晚新生代青藏高原隆升的阶段和高度[C]//黄土、第四纪地质、全球变化(第3集), 北京:科学出版社, 1992:1-13.[WU Xihao, WANG Fubao, AN Zhisheng, et al. Episodic uplifts of Qinhai-Xizang Plateau and its corresponding altitude during the Late Cenozoic[C]//Loess, Quaternary Geology and Global Chang Part Ⅲ. Beijing:Science Press, 1992:1
-13.]
[23] 周尚哲, 李吉均. 冰期之青藏高原新研究[J]. 地学前缘, 2001, 8(1):67-75.
[ZHOU Shangzhe, LI Jijun. A new study of Qinghai Tibet Plateau in ice ages[J]. Earth Science Frontiers, 2001, 8(1):67-75.]
[24] 许刘兵, 周尚哲, 王杰. 沙鲁里山更新世冰川作用及西南季风波动对末次冰期冰川作用的影响[J]. 第四纪研究, 2005, 25(5):620-629.
[XU Liubing, ZHOU Shangzhe, WANG Jie. Pleistocene Glaciations in the Shaluli Shan and the influence of Southwest Monsoon on the Glaciations during the Last Glacial Period[J]. Quaternary Sciences, 2005, 25(5):620-629.]
[25] 郑本兴. 云南玉龙雪山第四纪冰期与冰川演化模式[J]. 冰川冻土, 2000, 22(1):53-61.
[ZHENG Benxing. Quaternary glaciation and glacier evolution in theYulongMount, Yunnan[J]. Journal of Glaciology and Geocryology, 2000, 22(1):53-61.]
[26] 姚小峰, 郭正堂, 赵希涛, 等.玉龙山东麓古红壤的发现及其对青藏高原隆升的指示[J]. 科学通报, 2000, 45(15):1671-1676.
[YAO Xiaofeng, GUO Zhengtang, ZHAO Xitao, et al. Discovery of the paleo-laterite in the east piedmont of Yulong Shan and its indication to the uplift of the Tibetan Plateau[J]. Chinese Science Bulletin, 2000, 45(15):1671-1676.]
[27] 张虎才, 史正涛, 戴雪荣. 深海氧同位素第5阶段的气候记录:武都黄土剖面与极地冰心、深海沉积同位素记录的对比[J]. 兰州大学学报(自然科学版), 1997, 33(4
):107-115.[ZHANG Hucai, SHI Zhengtao, DAI Xuerong. The Climate Records of Deep Sea Oxygen Isotope Stage 5:A Detai led Correlation between Wudu Loess, Ice Cores from Polar Glaciers and Deep Sea[J]. JOURNAL OF Lanzhou University(Natural Sciences), 1997, 33(4):107-115.]
[28] 施雅风, 姚檀栋. 中低纬度MIS3b(54-44ka BP)冷期与冰川前进[J]. 冰川冻土, 2002, 24(1):1-9.
[SHI Yafeng, YAO Tandong. MIS 3b(54~44 kaBP) cold period and glacial advance in middle and latitudes[J]. Journey of Glaciology and Geocryology, 2002, 24(1):1-9.]
-
计量
- 文章访问数: 1011
- PDF下载数: 1
- 施引文献: 0
下载: