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Pollen-inferred vegetation and environmental changes since 16.7 ka BP at Balikun Lake, Xinjiang

ISSN号：1001-6538
期刊名称：科学通报(英文版)
时间：0
页码：2449-2457
语言：中文
分类：P532[天文地球—古生物学与地层学;天文地球—地质学]
作者机构：[1]MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, China, [2]Texas Archeological Research Laboratory, University of Texas, Austin, TX 78712, USA, [3]Geology Department, Kansas State University, Manhattan, KS 66506, USA, [4]Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
相关基金：Supported by the NSFC Innovative Research Team Project （Grant No. 40421101 ） and the International Cooperation Project （Grant No. 2002CB714004）. Laboratory analyses are supported by the NSFC Key Project （Grant No. 90502008） and the NSFC （Grant No. 40502016）
相关项目：青藏高原和中东亚干旱区环境变化与地表过程研究

关键词：中国, 晚第四纪, 干旱地区, 古气候学, Megalake Jilantai-Hetao, shorelines, lacustrine sediments, late Quaternary, high lake levels

中文摘要：

我们识别了 geomorphological，在通过地调查并且通过地区性的遥感的分析的当前的 Jilantai 盐湖附近的高湖层次的沉积、生物的证据想象。在约 1060， 1050， 1044 和 1035 m a.s.l 的举起有四组海岸线，是在当前的盐湖上面的 37， 27， 21 和 12 m 分别地出现。沙和石子的沿岸的存款在在 1070 和 1080 m a.s.l 之间的举起被发现，比水流高的 47 ～ 57 m 腌湖表面，尽管 palaeoshoreline 地形仅仅在几个地点被保存。在 Herimuxini，在 Ulan Buh 荒芜的、典型湖的沉积和沙石子的北边缘上，沿岸的存款也发生在 1080 m a.s.l 并且在下面的举起。典型吐痰扩大的 A 11-km-long 从逐渐地在它的大拐弯上沿着黄河的南部的银行在一些沙石子石场从 1050 ～ 1035 m a.s.l 在举起减少的这条海岸线东方海岸线特征例如在水文学计量器车站和 Shilazhao 镇附近定位的那些，被识别。沿岸的存款 overlying 冲积的洪水的层在 Hangjin 在 Balagong 附近发生在沙石场县。也有沙滩岩石和沿岸的存款，沿着 Langshan-Yinshan 山的南部的山麓在几个地点在 cut-and-built 平台上保存。另外，揭示水下的三角洲沉积的侧面在 Wuhai 附近被识别，在黄河进入盆的地方。典型的湖沉积也在 Hetao 平原的东方结束在 Togtoh 站台存在。水的软体动物壳在沿岸的存款是普通的，包括 Corbicula 的几种，根值 lagotis， R。xauricularia 和 Gyraulus convexiusculus。Ostracode 壳能也在更好的沉积被识别。典型垂直 prograding 序列在湖的沉积很好被保存的露头是明显的。滚动波浪的卵石和沙滩岩石很通常在更高的举起在堤在侧面的顶上被保存。所有这些证据建议曾经有一个巨大的palaeo湖，用到达我们指的 ∼1080 m a.s.l 的最高的湖水平盖住 Jilantai 区域和 Hetao 平原的大多数部分巨大的 paleolake ，比现代的湖贝加尔湖大，作为“ Megalake Jilantai-Hetao ”. OSL 标?

英文摘要：

We identified geomorphological, sedimentary and biological evidence of high lake levels around the current Jilantai Salt Lake through field investigations and through analyses of regional remote sensing images. There are four groups of shorelines at elevations of around 1060, 1050, 1044 and 1035 m a.s.l., being 37, 27, 21 and 12 m above the current salt lake surface, respectively. Littoral deposits of sand and gravels are found at elevations between 1070 and 1080 m a.s.l., 47 to 57 m higher than the current salt lake surface, although palaeoshoreline landforms are only preserved at several sites. At Herimuxini, on the northern margin of the Ulan Buh Desert, typical lacustrine sediments and sand-gravel littoral deposits also occur at elevations of 1080 m a.s.I, and below. A 11-km-long typical spit extends eastward from this shoreline gradually reducing in elevation from 1050 to 1035 m a.s.I. In some sand-gravel quarries along the southern bank of the Yellow River on its Great Bend, such as those located near the Hydrological Gauge Station and Shilazhao Town, shoreline features were identified. Littoral deposits overlying the alluvial-diluvial layers occur in a sand quarry near Balagong in Hangjin County. There are also beachrock and littoral deposits preserved on the cut-and-built terraces at several sites along the southern piedmont of Langshan-Yinshan Mountains. In addition, a profile revealing subaqueous delta sediments was identified near Wuhai, where the Yellow River enters the basin. Typical lake sediments also exist at the Togtoh Platform on the eastern end of the Hetao Plain. Aquatic Mollusk shells are common in the littoral deposits, including several species of Corbicula, Radix lagotis, R. xauricularia and Gyraulus convexiusculus. Ostracode shells can also be identified in finer sediments. Typical ver- tical prograding sequences are evident in outcrops where lacustrine sediments were well preserved. Wave-rolled cobbles and beachrock are very commonly preserved on the top of profiles in the embankments at

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