[SIT22-P29] Rock-magnetic properties of single zircon crystals sampled from the Yangtze River and the Mississippi River
Keywords:Zircon, Rock-magnetism, Yangtze river, Mississippi river
In order to evaluate the feasibility of the paleointensity experiment using single zircon crystals, we conducted systematic rock-magnetic measurements for single zircon crystals sampled from the Yangtze River and the Mississippi River. Remanent magnetizations of the single zircon crystals were measured using the superconducting quantum interference device magnetometer. Natural remanent magnetization (NRM) intensity was first measured. Then low-temperature demagnetization (LTD) treatment was further conducted, and the memory (NRM intensity after LTD treatment) was measured. We also carried out alternating field demagnetization (AFD) treatment, and the memory (NRM intensity after AFD treatment) was measured. After the NRM measurements, isothermal remanent magnetization (IRM) was imparted with a field of 1 T using pulse magnetizer, and the resultant IRM intensity was measured. Subsequently, IRM intensity after LTD treatment and AFD treatment were measured. For selected samples, hysteresis loop and low-temperature remanence curves were measured using the alternating gradient magnetometer and the magnetic property measurement system. We will discuss the rock-magnetic properties of single zircon crystal based on the experimental results.