Palaeomagnetic record from RH lacustrine core in Zoige Basin of Tibetan Plateau

摘要

RH core, located in the Zoige Basin of Eastern Tibetan Plateau, is a quite good lacustrine core. It is 120,40m long. Nine geomagnetic excursions or events were recorded in the core during Brunhes normal epoch based on measurement results of the remnant magnetization of small interval core samples (10 cm interval) under series AF demagnetization, and organic carbon-14 and AMS dates. The excursions recorded by the core can be correlated with those found in other regions in the world. They are the mostdetailed record in lacustrine deposit in China. B/M boundary in the core is at the depth of 108.0m. It can be calculated from the depositional rate of 0.13 mm/a that the bottom age of the core is 825 ka B.P. The excursion ages in Brunhes and their correlation with those found in other regions are discussed.