Details

Autor(en) / Beteiligte

• Yu, Xiangjiang
• Fu, Suotang
• Guan, Shuwei
• Huang, Baochun
• Cheng, Feng
• Cheng, Xiang
• Zhang, Tuo
• Guo, Zhaojie

Titel

Paleomagnetism of Eocene and Miocene sediments from the Qaidam basin: Implication for no integral rotation since the Eocene and a rigid Qaidam block

Ist Teil von

• Geochemistry, geophysics, geosystems : G3, 2014-06, Vol.15 (6), p.2109-2127

Ort / Verlag

Washington: Blackwell Publishing Ltd

Erscheinungsjahr

2014

Quelle

Wiley-Blackwell Full Collection

Beschreibungen/Notizen

• The Qaidam basin is the largest topographic depression inside the Tibetan Plateau and it is a key factor to understanding the Cenozoic evolution of the northern Tibetan Plateau. Paleomagnetic data was obtained from the middle to late Eocene Xiaganchaigou Formation and the early to middle Miocene Xiayoushashan Formation from seven localities. The paleomagnetic results indicate that the Qaidam basin has not undergone obvious basin‐scale vertical axis rotation with respect to the Eurasia Plate since the Eocene. Local clockwise rotation took place only at a few special locations along the northern margin of the Qaidam basin. The uniform paleomagnetic results at different localities support that the Qaidam basin is a relatively rigid block. Regional paleomagnetic and geodetic observations also suggest that crust south of the Kunlun fault moves eastward faster than crust north of the Kunlun fault. Key Points The Qaidam basin experienced no obvious basin‐scale rotation since Eocene The uniform paleomagnetic results support a relatively rigid Qaidam block The south side of the Kunlun Fault is the active side