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。
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.
出处
《西北地质》
CAS
CSCD
2005年第3期16-20,共5页
Northwestern Geology
基金
中国地质调查局1:25万玉门镇幅区调项目(编号200213000022)部分成果
