第七届青年地学论坛

4.2 ka event (4.2-3.9 ka BP), as an abrupt event happened in the Holocene, is considered to be related to the collapses of Neolithic cultural in many sites in East Asia. However, the precisely dated and high resolution paleoclimatic records during the 4.2 ka event in the monsoonal China are still not too many, especially in southeastern China, which constrains our understanding of the spatiotemporal variation of hydroclimate in East Asia. In this study, high-resolution monsoon precipitation variations during the Holocene were reconstructed by speleothem δ¹⁸O and δ¹³C records from Shennong cave, Jiangxi Province, Southeast China. The coherent variations in Shennong δ¹⁸O and δ¹³C records reveal that the climate in our study area was wet between 5.3 and 4.5 ka BP and dry between 4.5 and 3.6 ka BP with an anomalously wet interval of 4.3-4.0 ka BP on centennial timescales. By comparing with other well-dated records in monsoonal China, we suggest that the monsoon precipitation was decreased in northern China but increased it in southern China during the 4.2 ka event, which is consistent with previous conclusion.

石笋；铀系年代；4.2 ka事件；年代学