The Analyses of Cenozoic Sandstone Component in Hongsanhan No.1 Area and Its Tectonic Implications
The Analyses of Cenozoic Sandstone Component in Hongsanhan No.1 Area and Its Tectonic Implications
复制标题
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Guo Xin-zhuan
中科院分区：
文献类型：
--
作者：
Guo Xin-zhuan
高精度的磁性年代学研究表明，红三罕一区下干柴沟组和上干柴沟组的年龄在40 ~ 26.5Ma之间，下干柴沟组和上干柴沟组的分界年龄为35.5Ma。结果表明，砂岩组分对物源构造变化敏感，砂岩组分分析表明，下干柴沟期沉积环境相对稳定，揭示当时阿尔金山脉并未迅速隆升，但上干柴沟期沉积环境变得不稳定，结合区域热年代学资料，这表明阿尔金山脉在渐新世曾强烈隆升，这可能是阿尔金断裂沿着快速走滑运动的结果。
The highly precise magnetochronologic study indicates that the age of Xiaganchaigou and Shangganchaigou Formations in Hongsanhan No.1 area is in the range of 40-26.5 Ma.The dividing age between Xiaganchaigou and Shangganchaigou Formations is 35.5 Ma.According to the relativity of the sediment area and source provenance,Cenozoic sandstone samples,collected from Hongsanhan No.1 section in Qaidam Basin,have been analyzed by using Dickinson-Gazzi method.The results suggest that the sandstone components are sensitive to the provenance tectonic changes.The analyses of the sandstone components suggest that the sedimentary environment was relatively stable during Xiaganchaigou period,and reveal that the Altyn Mountains had not uplifted rapidly at that time.But during Shangganchaigou period the sedimentary environment became unstable,combining with regional thermochronologic data,it indicates that the Altyn Mountains were uplifted strongly in Oligocene,which may be caused by the fast strike-slip movement along the Altyn fault.