粒度统计分析方法在青藏高原隆升研究中的运用及效果——以昌马洪积扇为例

Effect of the size statistics in studying the uplift of the Tibetan plateau

摘要: 通过运用粒度统计方法对昌马洪积扇沉积物进行研究,结果显现自早更新世晚期以来存在7次沉积物粒度变粗事件,说明青藏高原东北缘自早更新世晚期以来发生了7次隆升,其间为稳定期。该结论与通过青藏高原东北缘盆地沉积分析、活动断裂及河流阶地活动时代对比而厘定的青藏高原东北缘构造活动时段基本一致,同时与整个青藏高原自早更新世晚期以来的隆升具有很好的耦合。由此为山前洪积扇研究提供了新的方法和线索。

Abstract: After being studied by size statistics in Changma diluvial fan, the conclusion that sediments sizes were largened 7 times from Early Pleistocence was drawn. That is to say, the north-eastern margin of the Tibetan plateau has uplifted 7 times. The same conclusion also had been drawn by analysising the sediments of basin and active fault and the river terraces. They have the same active times with the Tibetan plateau uplift in sera. So, the size statistics given a new methed to study the diluvial.