Independently dated paleomagnetic secular variation records from the Tibetan Plateau

Friday, 19 December 2014
Torsten Haberzettl1, Karoline Henkel1, Thomas Kasper1, Marieke Ahlborn1, Youliang Su2, Erwin Appel3, Guillaume St-Onge4, Joseph Stephen Stoner5, Gerhard Daut1, Junbo Wang6, Liping Zhu6 and Roland Maeusbacher1, (1)Friedrich Schiller University of Jena, Jena, Germany, (2)IGG Institute of Geology and Geophysics, Chinese Academy of Sciences, Paleomagnetism and Geochronology Laboratory, Beijing, China, (3)University of Tübingen, Tübingen, Germany, (4)University of Quebec at Rimouski UQAR, Rimouski, QC, Canada, (5)Oregon State Univ, Corvallis, OR, United States, (6)ITP Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China
Magnetostratigraphy has been serving as a valuable tool for dating and confirming chronologies of lacustrine sediments in many parts of the world. However, suitable paleomagnetic records on the Tibetan Plateau (TP) and adjacent areas are extremely scarce. Here, independently radiocarbon dated sediments of two lakes on the southern central TP, Tangra Yumco and Taro Co some 250 km further west, were investigated for their potential to record paleomagnetic secular variations. Multiple sediment cores resemble a very similar inclination pattern for the past 4000 years. This demonstrates the high potential of inclination to compare records over the Tibetan Plateau and eventually date other Tibetan records stratigraphically. Comparisons to an existing record from Nam Co, a lake 350 km west of Tangra Yumco, a varve dated record from the Makran Accretionary Wedge, and a stack record from East Asia reveal many similarities. However, model output data of geomagnetic field models for the coordinates of Tangra Yumco do not agree with our findings.