Paleosecular Variations During the Last Glacial Period From Tengchong Qinghai Lake, Yunnan Province, China

In recent years, the evolution of magnetic flux lobes in terms location and intensity has been attributed to paleosecular variation geomagnetic field, reflecting outer-core fluid convection close core-mantle boundary. However, most results were based on observational data for past 400 years supplemented by sparse archeomagnetic studies with approximately 3 kyr. this paper, we construct a relative paleointensity (RPI) record an inclination spanning ?90 kyr two cores from Tengchong Qinghai Lake (Yunnan Province, China), closed crater lake that formed late Pleistocene. The non-dipole field can be assessed much longer time scale. Although concentration domain state grains vary significantly, RPI is still representative features region Yunnan China. contrasting trends records eastern China since Holocene indicate southeastward migration Siberian lobe. During last glacial period, North Atlantic Ocean show opposite trends, denoting diverse strong influence lobe systems. reverse strengthened while weak normal weakened field.