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地质学报  2005 

西藏台错古湖沉积物中的硅藻及其古环境

, PP. 295-302

Keywords: 第四纪,硅藻,古生态,古气候

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Abstract:

根据硅藻组成、丰度及其生态特征的研究,可以恢复西藏台错古湖地区的古气候演变:在17.8~16.0kaBP经历了气候严寒期;16.0~13.9kaBP为回暖期;在11.5~10.7kaBP气候发生波动性变化,从较暖湿期到寒冷干旱的新仙女木期;在10.4~9.0kaBP气候略有变化,但总体上仍处于寒冷干旱期;在9.0~8.2kaBP转为为凉干期;6.3~5.4kaBP变为暖湿期;在5.4~4.5kaBP变为温暖、干旱期。由此可以看出,该区古气候演变除有仟年级的变化周期外,还可能存在有百年的气候期。自晚更新世晚期以来台错古湖随着古气候的演变,经历了缓慢扩张,湖水变深,而后又缓慢萎缩,湖水变浅,直至强烈的持续干旱,导致湖泊水位的聚降,使湖泊干枯消失。

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