青海湖第四纪晚期沉积地震地层特征分析
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摘要
青海湖是我国最大的内陆湖泊,目前的水域面积约4400 km2,流域面积约29660 km2。通过在湖内进行高分辨率浅层剖面探测(GeoPulse),发现不同发育阶段的沉积特征在地震剖面上得到很好的反映。Geopulse高分辨率浅层剖面穿透深度约60 m(分辨率为0.5 m),沉积层序在湖盆中央近水平展布,揭示沉积环境相对稳定,但也有局部的扰动或错断。尤其在南部近岸部位,上表层沉积出现弯曲,说明第四纪的晚近期,青海湖有过新的构造运动。
Qinghai Lake is the largest inland closed-basin lake in China,with an water area of 4 400 km2 and a drainage area of about 29 660 km2.Based on the geopulse high resolution sub-bottom profile survey,the later quaternary sediment characteristics in the lake are revealed on the sub-bottom profiles clearly.The penetration and resolution of the sub-bottom profiles are 60 m and 0.5 m respectively.The profiles in the basin center present a near level sediment stratum that reveals a stable sedimentary environment of the lake.However,there are also some disturbed sediment layer or small faults in basin boundary,especially,in the south nearshore area of the lake.It suggests that there was neo-tectonic movement in later quaternary in Qinghai lake.
Qinghai Lake is the largest inland closed-basin lake in China,with an water area of 4 400 km2 and a drainage area of about 29 660 km2.Based on the geopulse high resolution sub-bottom profile survey,the later quaternary sediment characteristics in the lake are revealed on the sub-bottom profiles clearly.The penetration and resolution of the sub-bottom profiles are 60 m and 0.5 m respectively.The profiles in the basin center present a near level sediment stratum that reveals a stable sedimentary environment of the lake.However,there are also some disturbed sediment layer or small faults in basin boundary,especially,in the south nearshore area of the lake.It suggests that there was neo-tectonic movement in later quaternary in Qinghai lake.
引文
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[9]中国1∶1000000地貌图编辑委员会西宁幅地貌制图研究组.祁连山区域地貌与制图研究[M].北京:科学出版社,1992.
[2]黄麒,青海湖沉积物的沉积速率及古气候演变的初步研究[J].科学通报,1988(22):1740-1744.
[3]沈吉,刘兴起,Matsumoto R,等.晚冰期以来青海湖沉积物多指标高分辨率的古气候演化[J].中国科学D辑,2004,34(6):582-589.
[4]袁宝印,陈克造,Bowle J M,等.青海湖的形成与演化趋势.第四纪研究,1990(3):233-243.
[5]Li J J.The environmental effects of the uplift of the Qinghai-Xizang Plateau.Quaternary Science Reviews,1991,10(6):479-483.
[6]潘保田.贵德盆地地貌演化与黄河上游发育研究[J].干旱区地理,1994,17(3):43-50.
[7]赵振明,刘百篪.青海共和至甘肃兰州黄河河谷地貌的形成与青藏高原东北部隆升的关系[J].西北地质,2003,36(2):1-12.
[8]中国科学院兰州地质研究所,等.青海湖综合考察报告[M].北京:科学出版社,1979:1-23.
[9]中国1∶1000000地貌图编辑委员会西宁幅地貌制图研究组.祁连山区域地貌与制图研究[M].北京:科学出版社,1992.
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