Palaeoclimatic changes over the past 1 million years derived from lacustrine sediments of Heqing basin (Yunnan, China)

Magnetic response to atmospheric heavy metal pollution recorded by dust-loaded leaves in Shougang industrial area, western Beijing

“…Temperature-dependent susceptibilities of sample 314 rapidly decreased between 100 200 during heating, revealing significant paramagnetic contribution [19] . It then gradually decreased above 200 , and abruptly dropped at about 550 , and reached the baseline at around 580 , again clearly indicating the presence of magnetite [20] . During the cooling cycle, the susceptibility dramatically increased at about 580 , obviously much higher than that in heating cycles, showing that new magnetite with high susceptibility was formed during the cooling cycle.…”

Fine-tuning of age integrating magnetostratigraphy, radiocarbon dating, and carbonate cyclicity: Example of lacustrine sediments from Heqing basin (Yunnan, China) covering the past 1Myr

“…Magnetic parameters (susceptibility and laboratory remanences) have been measured all along the core for palaeoenvironmental interpretation (Hu et al, 2005). In this paper we present magnetic results which are important for polarity stratigraphy.…”

“…The record of magnetic parameters, carbonate, pollen and spores, total organic carbon, and grain size distribution was interpreted by in terms of palaeoclimatic variations. The carbonate is most likely of detrital origin (Hu et al, 2005). Pollen data indicate alternations between temperate-arid and cold-humid conditions (Yang et al, 2000;Hu et al, 2005).…”

“…The carbonate is most likely of detrital origin (Hu et al, 2005). Pollen data indicate alternations between temperate-arid and cold-humid conditions (Yang et al, 2000;Hu et al, 2005). Highs (maghemite and magnetite) and lows (maghemite only) of magnetic susceptibility was related to warm and cold periods, respectively (Hu et al, 2005).…”

“…Pollen data indicate alternations between temperate-arid and cold-humid conditions (Yang et al, 2000;Hu et al, 2005). Highs (maghemite and magnetite) and lows (maghemite only) of magnetic susceptibility was related to warm and cold periods, respectively (Hu et al, 2005). Magnetic and non-magnetic data show a clear change at 65 m (corresponding to $410 ka) indicating a change in the depositional system related to a climatic and/or tectonic event (Hu et al, 2005).…”