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Paleomagnetic measurements were performed on sediments drilled from ICDP Site5011-1 in Lake El'gygytgyn (67°30' N, 172°05' E) locatedin Far East Russian Arctic. The lake partly fills a crater formed by ameteorite impact 3.58 ± 0.04 Ma ago. Sediments from three parallelcores (5011-1A, 5011-1B and 5011-1C), recovered from the middle part of thelake, yield a total of 355 m of sediment. Sediments are characterized by avariable lithology, where intervals of homogenous and laminated sedimentsalternate, and mass movement deposits occur frequently along the sedimentprofile. Mineral magnetic investigation made on sediments enclosed in corecatchers suggests that magnetic carrier in these sediments is partlymaghemitized Ti-rich pseudo-single domain magnetite. Its detrital origin canbe shown by mineral magnetic measurements and SEM-EDS analyses performed onmini-sized cylindrical rock samples, polished rock sections and creeksediments. The intensity of the natural remanent magnetization in thesediments is high with a range from about 1 to 1000 mA m<sup>−1</sup>. Most ofthe sediments carry a stable magnetization interpreted as primarydepositional remanent magnetization. Characteristic inclination data showalternating intervals of steep positive and negative inclinations that areused to assign magnetic polarity to the lake sediment profile. This is arather straightforward procedure owing to the mainly high quality of data.The Matuyama/Gauss (M/G) (2.608 Ma) and Brunhes/Matuyama (B/M) (0.780 Ma)reversals were recognized in the sediments. The Mammoth and Kaena reversedsubchrons were identified during the Gauss chron, and the Olduvai andJaramillo normal subchrons as well as the Réunion and Cobb Mountaincryptochrons were identified during the Matuyama chron. Sediments alsoprovide a record of the Olduvai precursor and Intra-Jaramillo geomagneticexcursions. Sediment deposition rate is highest at the base of the sequencelaid down in the early Gauss chron, when the deposition rate is approximately44 cm kyr<sup>−1</sup>. Sediment deposition decelerates upcore and it is an orderof magnitude lower during the Brunhes chron in comparison with the earlyGauss chron. Decrease in sediment deposition in the late Pliocene probablyrelates to atmospheric and oceanic reorganization heralding the onset ofQuaternary climate change. The high-quality magnetostratigraphy reconstructedfrom Lake El'gygytgyn sediments provides 12 first-order tie points to pindown the age of the longest paleoclimate record from the continentalArctic

climate of the past

Magnetostratigraphy of sediments from Lake El'gygytgyn ICDP Site 5011-1: paleomagnetic age constraints for the longest paleoclimate record from the continental Arctic