Response of Magnetic Fabric of Xichagou Section in Late Tertiary to Climate Change,Western Qaidam Basin
- Received Date: 1900-01-01
- Rev Recd Date: 1900-01-01
- Publish Date: 2009-02-10
-
Key words:
- magnetic fabric /
- Qaidam Basin /
- climate change /
- Xichagou
Abstract: Through equidistantly sampling on 2~3 meters and accurate systematic measurement of samples of Xichagou stratotype section, located in southwesern limb of Ganchaigou anticline in western Qaidam Basin(Chaixi area) ,integrated high resolution and high precision magnetostratigraphy and sedimentological study in this section, authors think the changing trends of magnetic fabric parameters of sedimentary rocks may act as proxies of climate change.It was indicated that environmental change between 22.4 to 6.2 Ma may divide into three stages: first stage: humid context between ~22.4 to 13.4 Ma; secondary stage: warmarid environment transformed aridcold one from 13.4 to 8.2 Ma, and third stage from 8.2 to 6.2 Ma, climate lasted drycold, and more complexly. It can be considered that rhythm of climate change or tectonism correlated to formation of modern monsoon since 7.8 Ma. This result provides available evidence for the uplift process of Tibetan Plateau and its environmental effectes.
Citation: | GAO Junping. Response of Magnetic Fabric of Xichagou Section in Late Tertiary to Climate Change,Western Qaidam Basin[J]. Acta Sedimentologica Sinica, 2009, 27(1): 128-136. |