Records of palaeoenvironment and palaeoclimate changes since the MIS 3 in Borehole YQ0902 at Wenrui Plain，Zhejiang Province
Shang Shuai1 Fan Daidu1 Wang Qiang2 Zhang Mengying1
1 State Key Laboratory of Marine Geology，Tongji University，Shanghai 200092 2 Tianjin Institute of Geology and Mineral Resources，China Geological Survey Bureau，Tianjin 300170
Abstract Borehole YQ0902 is located at the Wenrui Plain along the south flank of Oujiang delta in southern Zhejiang Province.Sedimentary facies，grain-size analysis and AMS 14C dating results show that the palaeosol is underlain by the lagoon facies formed during MIS(Marine Isotope Stage)3.It was therefore indicated that the sea level in the early and middle MIS 3 should reach a point at least 30m below the present sea-level(not calibrated by tectonic movement and sediment compaction).The pedogenesis of the palaeosol should have taken place in the MIS 2 and its original strata are lagoon deposits at the lower and floodplain deposits at the top.A transgression-regression sequence overlying the palaeosol was formed in the Holocene and it has similar sedimentary facies assemblages with those at the frontal part of the southern flank of Changjiang delta.The initial flooding surface was formed at about 9 cal ka BP in Borehole YQ0902，suggesting that the sea level at the time was approximately 25m below the present sea-level.In the middle Holocene，the strengthening East Asia Monsoon (EAM)increased sediment input to the study area by the river or through the longshore currents，consequently resulting in high accumulation rate.The sedimentation rate was low in the Mid-Late Holocene(5～2 cal ka BP)with stable or a little fall in sea level and the weakened EAM.High resolution X-ray fluoroscopy(XRF) core scanning data of relative element ratios were considered as important proxy of palaeoenvironment and palaeoclimate research.For example，Cl/Ti and Fe/Ti are good indices of mariness (the degree connected to sea) and EAM strength，respectively.
Corresponding Authors:
Fan Daidu，born in 1972，is a professor of sedimentology at Tognji University. E-mail: ddfan@tongji.edu.cn
About author: Shang Shuai，born in 1989，is a Ph.D.candidate of sedimentology at Tongji University. email: shangshuai777@163.com
Cite this article:
Shang Shuai,Fan Daidu,Wang Qiang et al. Records of palaeoenvironment and palaeoclimate changes since the MIS 3 in Borehole YQ0902 at Wenrui Plain，Zhejiang Province[J]. JOPC, 2013, 15(4): 551-564.
Shang Shuai,Fan Daidu,Wang Qiang et al. Records of palaeoenvironment and palaeoclimate changes since the MIS 3 in Borehole YQ0902 at Wenrui Plain，Zhejiang Province[J]. JOPC, 2013, 15(4): 551-564.
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