Diatom response to climatic and tectonic forcing of a palaeolake at the southeastern margin of the Tibetan Plateau during the late Pleistocene, between 140 and 35 ka BP

摘要: Abstract The Heqing Basin is located in Yunnan Province, south-western China, near the southeastern edge of Tibetan Plateau, a region that strongly influenced by Asian monsoon. Its long sedimentary record represents an archive global importance for palaeoclimate research. This study presents results diatom analysis last 140–35 ka record, dated using AMS 14 C and magnetostratigraphy. Diatoms are generally well preserved apart at top sequence (after 35 ka BP) which diatoms were too few to be counted. data provide detailed history palaeoenvironmental changes during late Pleistocene demonstrate sensitivity climate hydrology. In particular, they proxy evidence water depth indirect temperature characterized glacial-interglacial shifts between planktonic benthic variations percentage warm-water eutrophic species Aulacoseira granulata , respectively. sequence, remarkably, high proportions coincide with warm wet conditions suggesting this site signal mediated climate-catchment-vegetation processes, such as concentration nutrient runoff from catchment. From ~ 132 ka BP however, tectonic uplift basin caused change hydrological setting lake. Pollen geochemical then used help interpreting disentangle direct effects those on catchment influence glacier melt-water.