Progress in Tracing Provenance of Eolian Deposits in Chinese Loess Plateau
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摘要: 黄土高原风尘堆积是开展古环境变化研究的重要沉积物,其源区的具体位置和变化程度对于揭示东亚大气环流演化具有关键意义,而且一直被学术界广泛关注,存在较大争议.前人通过地球化学(Sr-Nd-Pb同位素、元素地球化学、碎屑锆石U-Pb年龄)、矿物学(白云石、重矿物)、物理学(释光灵敏度、电子自旋共振信号和环境磁学)、气象观测与模拟、地貌学等方法对黄土高原风尘堆积及其潜在源区(北方荒漠和戈壁以及青藏高原东北部)开展了大量示踪研究.研究表明青藏高原东北部、阿拉善高原、塔里木盆地和蒙古戈壁可能是非常重要的源区.目前存在的问题:(1)源区的具体区位;(2)源区物质供给系统是否存在时空变化;(3)第四纪以来的黄土研究居多,而更老时间尺度上风尘堆积的物源研究较少.因此,今后开展更多粉尘物源示踪方法学的研究,并加强第四纪以前黄土高原风尘堆积的物源研究,是风尘堆积物源研究的重要内容.Abstract: Eolian deposits accumulated in the Chinese Loess Plateau (CLP) are valuable archive for reconstruction of paleoenvironmental change in East Asia. The source area of the eolian deposits in the CLP is correlated with the evolution of past atmospheric circulation of East Asia, so it is highly focused by researchers. However, the controversies are still being debated. During the past, methods of geochemistry (isotope geochemistry, element geochemistry, and detrital zircon U-Pb age), mineralogy (dolomite, heavy mineral composition), optically stimulated luminescence (OSL) sensitivity, electronic spine resonance (ESR) signal intensity, environmental magnetism, meteorological observation and modeling, and geomorphic methods were applied to track the source area of the eolian deposits by comparative study of the sediments in the CLP and the potential source areas (e.g., gobi and deserts in north China and the northeast Qinghai-Tibet Plateau) surrounding the CLP. The results show that the source area of eolian deposits in the CLP lies in the north and northwest of the CLP, and northeast Qinghai-Tibet Plateau, the Alashan Plateau (Badan Jaran desert, Tengger desert), Tarim basin and Mongolia would be the most important source areas. The controversies mostly focus on which detail area can be the source area of the eolian deposits in the CLP and whether the source area changed temporarily and spatially. Recent provenance studies of the eolian deposits in the CLP are mainly concentrated on the Quaternary loess deposits, but the studies of older deposits are relatively few. Thus, more methodologies of tracing the source area of eolian deposits and more studies for provenance of eolian deposits which accumulated before Quaternary would be the main task in the future.
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Key words:
- Chinese Loess Plateau /
- eolian deposit /
- provenance /
- desert /
- Qinghai-Tibet Plateau /
- geochemistry
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图 1 黄土高原与北方戈壁、荒漠(据Sun,2002和Chen et al., 2007修改)
Fig. 1. Chinese Loess Plateau, gobi and deserts in North China
图 2 黄土高原风尘堆积与潜在源区的Sr-Nd同位素组成
潜在源区阿拉善高原、鄂尔多斯高原、塔里木盆地、柴达木盆地、准噶尔盆地和东北沙地的数据来自Chen et al., 2007;青藏高原东北部的数据来自Yang et al., 2009和Li et al., 2011
Fig. 2. Sr-Nd isotope composition of the eolian deposits in northern China and their possible source areas
图 3 泾川、灵台剖面风尘堆积Sr、Nd和Pb同位素比值的演化
a和b.数据来自Sun,2005和Wang et al., 2007;c.数据来自Sun and Zhu, 2010
Fig. 3. Sr, Nd and Pb isotopic ratios of eolian deposits in the Jingchuan and Lingtai sections
图 4 风尘物质中不同粒级组分中Sr、Nd和Pb同位素比值
样品L10、L33、L1、S5和红粘土数据依据Rao et al., 2006;样品LT-25、ZT-2和WJ-1数据依据Feng et al., 2009;样品LH1-3的Pb同位素比值据Feng et al., 2010
Fig. 4. Sr, Nd and Pb isotopic compositions of eolian deposits in different grain-size components
图 6 西峰和渭南晚第四纪黄土与潜在源区石英颗粒(<16 μm)的ESR信号强度(据Sun et al., 2007, 2008)
Fig. 6. Electronic spin resonance (ESR) signal intensity of quartz grain (< 16 μm) in sediments at Xifeng and Weinan sections and possible source areas of the eolian deposit
表 1 黄土高原风尘堆积主要源区研究结果
Table 1. The source areas of the eolian deposits in Chinese Loess Plateau
阿拉善高原a 青藏高原 鄂尔多斯高原b 塔里木盆地 柴达木盆地 准噶尔盆地 参考文献 √ Bowler et al., 1987 √ Liu et al., 1994 √ √ × Sun et al., 2001 √ √ × × × Sun,2002 √ √ Zhang et al., 2003 √ Fang et al., 2004 √ Honda et al., 2004 √ √ √ Rao et al., 2006 √ × √ Chen et al., 2007 √ √ √ Li et al., 2007 × √ 李锋,2007 √ √ 杨杰东等,2007 √ Rao et al., 2008 √ √ × Sun et al., 2008 √ Yang and Ding, 2008 √ √ √ Yang et al., 2009 √ √ Jeong and Lee, 2010 √ √ Stevens et al., 2010 √ Ferrat et al., 2011 √ Kapp et al., 2011 √ √ Pullen et al., 2011 √:是风尘堆积的主要源区;×:不是风尘堆积的主要源区; a.阿拉善高原:包括巴丹吉林沙漠、腾格里沙漠和乌兰布和沙漠; b.鄂尔多斯高原:包括库布齐沙漠和毛乌素沙漠. -
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