吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (1): 163-174.doi: 10.13278/j.cnki.jjuese.201601114
裴军令1, 周在征1, 李海兵2, 孙知明1
Pei Junling1, Zhou Zaizheng1, Li Haibing2, Sun Zhiming1
摘要：
通过柴达木盆地南八仙剖面磁性地层学研究,建立了部分上油砂山组磁极性序列,认为该剖面时代为7.5~9.0 Ma。从320块样品的古地磁数据分析,揭示了一组高温特征剩磁分量,在95%置信度下通过倒转检验(B级),说明这组高温分量很可能代表岩石形成时的原生剩磁,其特征剩磁方向为:地理坐标下为Dg=358.5°, Ig=40.5°, k=28.5,α95=4.2,层面坐标下为Ds=1.0°, Is=41.5°, k=34.0,α95=3.8;相应的极位置为λp=75.9°N, φp=270.5°E, dp=2.8°, dm=4.6°。通过与同时代柴达木盆地及邻区的古地磁极对比,说明中中新世以来柴达木地块整体上没有经历明显旋转运动,阿尔金断裂活动致使肃北等毗邻断裂带地区发生了构造旋转。
中图分类号:
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