Geochemistry and Magnetism of Peat Deposits in the Khor–Kiya Interfluve, Sikhote–Alin (Preliminary Results)

This paper presents geochemical, microprobe, paleomagnetic, and rock magnetic data from peat accumulated over the past 10 000 years in the area between the Khor and Kiya rivers (Khabarovsk krai). A horizon ranging in thickness between 75 and 100 cm with elevated concentrations of Ni, Zn, Bi, and Se is identified as a result of comprehensive studies. Magnetite and carbon spherules, as well as native iron found at the bottom of the horizon suggest an impact event that occurred about 5500 years ago. For the first time, peat deposits are a target of paleomagnetic research. Distinct inclination variations of the remanent magnetization vector are established in the horizon at a depth of 50 to 75 cm, which corresponds in time to the “Etrussia” geomagnetic excursion (2500 years ago).