摘要
压实作用可能会对地层的真实厚度和沉积速率造成影响,因而需要进行矫正,但在实际研究中很少考虑这些影响。通过对柴达木盆地东北缘大红沟剖面新生代地层古厚度的恢复,原始沉积速率的详细研究及盆地内其它剖面研究资料的对比,发现该区52～13Ma间至少存在3次大规模的构造隆升事件,时间分别在约49.5Ma、45.5～33Ma、25～16Ma,揭示了柴达木盆地北缘沉积演化和南祁连山隆起的过程,发现经矫正后的沉积速率峰值与前人所总结的新生代青藏高原隆升期可以较好地对比,为探讨青藏高原构造隆升过程及沉积速率对其发展的响应提供重要的信息。
The influence of compaction has always been ignored in the study of stratigraphic authentic thickness and sedimentation rate. The authors studied in detail the ancient thickness and original deposition rate of Cenozoic strata along Dahonggou section at the northeastern edge of Qaidam Basin. A comparison with other sections in the basin shows that at least three intense tectonic uplift events happened in this region from ca. 52Ma to ca. 13Ma, and the ages of each stage are ca. 49.5Ma,45.5～33Ma,and 25～16Ma,re- spectively. The results reveal the sedimentary evolution of the northeast margin of Qaidam Basin and the uplift of northern South Qil- Jan Mountains, and the corrected sedimentation rate is coupled well with the tectonic uplift stages of the plateau summed up by previ- ous researchers. The results obtained by the authors provide important information for exploring the process of tectonic uplift in the whole Tibetan Plateau and the deposition fate＇s response to that development.
出处
《地质通报》
CAS
CSCD
北大核心
2013年第1期105-110,共6页
Geological Bulletin of China
基金
中国地质调查局项目<青藏高原新近纪隆升过程与地质事件群研究>(编号:1212011121261)
