兰州东盆地的枣树沟黄河第四级阶地(T4),砾石层顶高出黄河河面84m,其上堆积厚约64m的风成黄土,黄土地层中包括八层古土壤,最底部发育了古土壤S8。光释光(OSL)测年结果显示古土壤S1上部的年龄为70.4±7.6ka。黄土古土壤对比以及磁性地层学研究表明,枣树沟T4上覆风成黄土的年龄为865ka,T4至少形成于865kaB.P.。
The research on Yellow River terrace is the fourth terrace of Zaoshugou section in Eastern Lanzhou Basin,and the altitude of gravel stratum is 84m higher than the river level. The top of the gravel stratum is covered by at least 64m eolian loess,and the paleosol S8 is at the bottom of the eolian loess. The optically stimulated luminescence (OSL) dating result indicates that the age of the upper part of paleosol S1 is 70.4?7.6ka. Paleosol-loess matching and research on magnetostratigraphy show that the bottom age of eolian loess on the fourth terrace is 865ka, therefore this article holds that the fourth terrace of Zaoshugou section develops no later than 865kaB.P.
[1] 孙鸿烈,郑度.青藏高原形成演化与发展[M].广州:广东科技出版社,1998.95~98.
[2] Pisias N G, Moore T C. The evolution of Pleistocene climate:a time series approach[J]. Earth and Planetary Science Letter,1981,52:450-458.
[3] Ruddiman W F, Raymo M E, Martinson D G et al. Pleistocene evolution:northern hemisphere ice sheets and North Atlantic Ocean[J]. Paleoceanpgraphy, 1989, 4:353-421.
[4] Demenocal P B. Plio-Pleistocene African climate. Science, 1995, 270:53-59.
[5] Bolton E W, Maasch K A, Lilly J M. A wavelet analysis of Plio-pleistocene climate indicators:a new view of periodicity evolution[J]. Geophysical Research Letters, 1995, 22:2753-2756.
[6] Shackleton N J. The 100,000 year ice-age cycle identified and found to lag temperature, carbon dioxide, and orbital eccentricity[J]. Science,2000, 289:1897-1902.
[7] Hooghiemstra H, Melice J L, Berg A et al. Frequency spectra and paleoclimatic variability of the high-resolution 30ka~145ka Funza-I pollen record (Eastern Cordillera, Colombia)[J]. Quaternary Science Review, 1993, 12:141-156.
[8] Ding Z L, Yu Z, Rutter N W et al. Towards on orbital time scale for Chinese loess deposits[J]. Quaternary Science Review, 1994,13:39-70.
[9] Berger A, Loutre M F.Insolation value for the climate of the last 10 million years[J]. QuaternaryScience Research, 1991, 10: 297-317.
[10] 崔之久,伍永秋,刘耕年.昆仑-黄河运动的发现及其性质[J]. 科学通报,1997,42(18):1986~1989.
[11] 施雅风.第四纪中期青藏高原冰冻圈的演化及其与全球变化的联系[J]. 冰川冻土,1998,20(3):197~208.
[12] 沈玉昌,龚国元.河流地貌学概论[M]. 北京:科学出版社,1987.56~71.
[13] 杨景春,谭利华,李有利,等.祁连山北麓河流阶地与新构造演化[J]. 第四纪研究,1998,(3):229~237.
[14] Li Jijun, Xie Shiyou, Kuang Mingsheng. Geomorphic evolution of the Yangtze Gorges and the time of their formation[J]. Geomorphology,2001,41 (2-3):125-135.
[15] 向 芳,朱利东,王成善,等. 长江三峡阶地的年代对比法及其意义[J]. 成都理工大学学报(自然科学版),2005, 32(2):162~166.
[16] 陈 云,童国榜,曹家栋,等.渭河宝鸡段河谷地貌的构造气候响应[J]. 地质力学学报,1999,5(4):49~56.
[17] 岳乐平,雷祥义,屈红军.黄河中游水系的阶地发育时代[J]. 地质论评,1997,43(2):186~192.
[18] 潘保田,邬光剑,王义祥,等.祁连山东段沙沟河阶地的年代与成因[J]. 科学通报,2000,45(24):2669~2675.
[19] Maddy D, Bridgland D, Westaway R. Uplift-driven valley incision and climate-controlled river terrace development in the Thames Valley, UK[J]. Quaternary international, 2001,79:23-36.
[20] Li Jijun. The environmental effects of the uplift of the Qinghai-Xizang plateau[J]. Quaternary Science Reviews,1991,10:479-483.
[21] Ding Z L, Derbyshire E, Yang S L et al. Stacked 2.6Ma grain size record from the Chinese loess based on five sections and correlation with the deep-sea δ18o record[J]. Paleoceanography, 2002,17(3):501-521.
[22] Cande S C, Kent D V. Revised calibration of the geomagnetic polarity timescale for the late Cretaceous and Cenozoic[J]. Journal of Geophysical Research,1995,100:603-609.
[23] 岳乐平,薛祥煦.中国黄土古地磁学[M]. 北京:地质出版社,1996.79~81.
[24] 刘东生.黄土与环境[M]. 北京:科学出版社,1985.62~81.
[25] 张宗祜,张之一,王芸生.中国黄土[M]. 北京:地质出版社,1989.157~166.
[26] Zheng H B, An Z S, John S et al. A detailed terrestrial geomagnetic record for the interval 0-5 Ma. In: Liu T S eds. Loess, Environment and Global Change[M]. Beijing: Science Press, 1991.147-156.
[27] Li Jijun, Zhang Bao, Zhu Junjie et al. Magneto-and pedo-stratigraphy of paleosol-loess sequences in the Lanzhou Basin:evidence for evolution of Huang He[J]. Chinese Science Bulletin, 1999, 44(supplement):119-128.
[28] 赵志军,方小敏,李吉均,等.祁连山北缘酒东盆地晚新生代磁性地层[J]. 中国科学(D辑),2001,31:195~201.
[29] 史正涛,业渝光,赵志军,等.酒泉盆地晚新生代地层的ESR年代[J]. 中国科学(D辑),2001,31:163~168.
[30] 潘保田,李吉均,曹继秀,等.化隆盆地地貌演化与黄河水系发展研究[J]. 山地研究,1996,14(3):153~159.
[31] 李吉均,方小敏,马海洲,等.晚新生代黄河上游地貌演化与青藏高原隆升[J]. 中国科学(D辑),1996,26(4):316~322.
[32] 李吉均.青藏高原的地貌演化与亚洲季风.海洋地质与第四纪地质,1999,19(1):1~11.
[33] 邬光剑.祁连山东段0.8Ma以来的构造隆升与气候变化[M]. 兰州:兰州大学出版社,2001.
[34] 郭进京,杜东菊,韩文峰,等.青藏高原东北缘黄河黑山峡出口段阶地特征与断层活动[J]. 工程地质学报,2004,12(4):367~372.
