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科学通报  2011 

我国东北地区黄土堆积的磁性地层年代与古气候变化

DOI: 10.1360/972011-311, PP. 2267-2275

Keywords: 中国东北,科尔沁沙地,黄土,磁性地层,古气候

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Abstract:

我国东北地区有较广泛的黄土分布,是环境变化的重要地质记录.长期以来,由于缺乏可靠的年代学证据,对这里黄土沉积及其记录的古气候变化了解不多.在广泛野外踏勘的基础上,对具有代表性的科尔沁沙地南缘牛样子沟和平安村黄土剖面进行了磁性地层与光释光年代等测试,结果表明,牛样子沟剖面的B/M界限位于深度27m处,平安村剖面处于布容正极性期.基于光释光年龄和磁性地层年代计算的黄土沉积速率外推,科尔沁沙地南缘的黄土堆积应早于1.0Ma.黄土是半干旱环境下的粉尘堆积,指示东北地区的半干旱气候至少在早更新世晚期已经开始.这里黄土开始堆积的年代对应于中更新世全球气候转型,可能为全球气候变冷驱动了亚洲内陆干旱化和较快粉尘堆积的假说提供了证据.

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