The Wutou section, hereinafter referred to as “WTS”, lies in Jiangping, Guangxi Province, China (21°32′8.25″ N, 108°06′59.9″ E; thickness of 246 cm) and consists of fluvial-lacustrine facies and dune sands of the Late Holocene. This study reconstructed the evolution of storm surges along the coast of the Beibu Gulf, Guangxi over the Little Ice Age, based on three accelerator mass spectrometry (AMS)-14C, optically stimulated luminescence (OSL) dating ages, and the analyses of grain size and heavy minerals. The analysis results indicated that the storm sediments interspersed among aeolian sands, lagoon facies, and weak soil display a coarse mean grain size and poor sorting. The storm sediments also show high maturity of heavy minerals and low stability resulting from rapid accumulation due to storm surges originating from the land-facing side of the coastal dunes. Records of seven peak storm surge periods were recorded in the WTS over the past millennium and mainly occurred after 1400 AD, i.e., during the Little Ice Age. The peaks in storm surges, including the 14Paleostrom deposit (hereinafter referred to as “Pd”) (1425–1470AD), 10Pd (1655–1690AD), 6Pd (1790–1820AD), and 4Pd (1850–1885AD) approximately corresponded with the periods of minimum sunspot activity, suggesting that the periods of storm surge peaks revealed by the WTS were probably regulated to a great extent by solar activity.
The MGS2 segment of the Milangguowan stratigraphical section in the Salawusu River Valley,southeast of China’s Mu Us Desert,records 5.5 sedimentary cycles consisting of dune sands alternating with fluvial or lacustrine facieses.Based on the grain-size and CaCO3 analysis,it was found that Mz and σ appear peaks and valleys in different sedimentary facieses.CaCO3 contents range from 0 to 2.94%(average 0.39%) in the dune sands,0.14% to 2.68%(average 1.43%) in the fluvial facieses and 0.39% to 15.57%(average 8.82%) in the lacustrine,and appear 5.5 grain-size and CaCO3 cycles similar to the sedimentary facieses changes.And the CaCO3 contents have a significant correlation with Mz.The result show that the dune sands accumulate and CaCO3 moved greatly during the periods with a strong cold-dry winter monsoon.Whereas,the fluvial or lacustrine facieses developed,silt and clay increased and CaCO3 gathered largely when the warm-humid summer monsoon strengthened.The observed climate fluctuations on millennium-scale during the Pleniglacial to the alternations attributed the strength of the East Asian winter and summer monsoons.
'/%3e%3cuse xlink:href='%23a' transform='rotate(23.036 .093 25.536)'/%3e%3cuse xlink:href='%23a' transform='rotate(45.87 1.273 16.18)'/%3e%3cuse xlink:href='%23a' transform='rotate(69.945 .996 12.078)'/%3e%3cuse xlink:href='%23a' transform='rotate(20.66 -19.689 31.932)'/%3e%3c/svg%3e)