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内蒙古额济纳盆地戈壁10Be暴露年龄与洪积作用的演化 被引量:10
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作者 吕延武 顾兆炎 +3 位作者 aldahan ala 张虎才 POSSNERT Goran 雷国良 《科学通报》 EI CAS CSCD 北大核心 2010年第27期2719-2727,共9页
重建干旱地区洪积成因戈壁的形成历史能够揭示控制洪积作用时空演化的构造、气候变化.对额济纳盆地不同地貌单元的戈壁石英砾石宇宙成因核素10Be浓度的测量和暴露年龄的估算表明,盆地北缘戈壁阿尔泰洪积平原上的戈壁至少在420ka前就已出... 重建干旱地区洪积成因戈壁的形成历史能够揭示控制洪积作用时空演化的构造、气候变化.对额济纳盆地不同地貌单元的戈壁石英砾石宇宙成因核素10Be浓度的测量和暴露年龄的估算表明,盆地北缘戈壁阿尔泰洪积平原上的戈壁至少在420ka前就已出现;而盆地内黑河流域洪积平原上的戈壁则形成于约190ka以来,并逐步向北和向东现代低海拔、尾闾湖方向发展,这种演化趋势可能是在青藏高原隆升和盆地内构造活动的影响下洪积作用和洪积扇发育空间变化的结果;420ka以来气候冰期/间冰期的冷暖旋回造成的周边高山地区冰川的前进与后退,可能主导了盆地洪积作用的强弱变化和水体的大小,大规模、高能量的洪水主要发生在高山冰雪消融时期(冰消期),可能也是盆地水体最大时期. 展开更多
关键词 10Be 戈壁沙漠 洪积扇 额济纳盆地 构造 气候
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^(10)Be in quartz gravel from the Gobi Desert and evolutionary history of alluvial sedimentation in the Ejina Basin,Inner Mongolia,China 被引量:7
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作者 LU YanWu GU ZhaoYan +3 位作者 aldahan ala ZHANG HuCai POSSNERT Goran LEI GuoLiang 《Chinese Science Bulletin》 SCIE EI CAS 2010年第33期3802-3809,共8页
Reconstructing the evolutionary history of the Gobi deserts developed from alluvial sediments in arid regions has great significance in unraveling changes in both tectonic activity and climate.However,such work is lim... Reconstructing the evolutionary history of the Gobi deserts developed from alluvial sediments in arid regions has great significance in unraveling changes in both tectonic activity and climate.However,such work is limited by a lack of suitable dating material preserved in the Gobi Desert,but cosmogenic 10Be has great potential to date the Gobi deserts.In the present study,10Be in quartz gravel from the Gobi deserts of the Ejina Basin in Inner Mongolia of China has been measured to assess exposure ages.Results show that the Gobi Desert in the northern margin of the basin developed 420 ka ago,whereas the Gobi Desert that developed from alluvial plains in the Heihe River drainage basin came about during the last 190 ka.The latter developed gradually northward and eastward to modern terminal lakes of the river.These temporal and spatial variations in the Gobi deserts are a consequence of alluvial processes influenced by Tibetan Plateau uplift and tectonic activities within the Ejina Basin.Possible episodes of Gobi Desert development within the last 420 ka indicate that the advance/retreat of alpine glaciers during glacial/interglacial cycles might have been the dominant factor to influencing the alluvial intensity and water volume in the basin.Intense floods and large water volumes would mainly occur during the short deglacial periods. 展开更多
关键词 额济纳盆地 戈壁沙漠 冲积物 内蒙古 石英 中国 演化史 沉积
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