| Institute of Karst Geology, Chinese Academy of Geological Sciences | Host |
| Citation: |
ZHANG Huiling, YU Kefu, ZHAO Jianxin, FENG Yuexing, LIN Yushi, ZHOU Wei, LIU Guohui. Variations in deposition rate of sedimentary cycle from a stalagmite in Lianhua Cave and its paleoclimatic implications during the mid-late Holocene[J]. Carsologica Sinica, 2017, (4): 580-590. doi: 10.11932/karst20170421
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Variations in deposition rate of sedimentary cycle from a stalagmite in Lianhua Cave and its paleoclimatic implications during the mid-late Holocene
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Abstract
Deposition rate of sedimentary cycle of stalagmite,which is calculated based on 230 Th age dating according to sedimentary cycle of stalagmite,is an important parameter of stalagmite formation and an effective paleoclimatic index to reconstruct paleoclimate.Variations in deposition rate of sedimentary cycle may reflect the change of surface temperature and rainfall,which immediately relates to intensity of summer monsoon.Making use of stalagmite LH2,collected from Lianhua Cave,Hunan Province,China,the paper reconstructs the history of surface temperature and rainfall since 8.6 ka BP based on 42 230Th ages.From 8.6 ka BPto 4.2 ka BP,the climate is characterized by high temperature and rainy,the summer monsoon is strong,deposition rate of sedimentary cycle is high.But the climate is not stable and there is a series of millennial to centennial fluctuations.From 4.2 ka BP to now,the climate is cool and dry,deposition rate of sedimentary cycle is low.Generally speaking,in orbital timescale,there is a negative correlation between deposition rate of sedimentary cycle and δ18 O record from stalagmite LH2.The deposition rate of sedimentary cycle stalagmite D4 from Dongge Cave duplicates that of stalagmite LH2,which confirms the validity of deposition rate of sedimentary cycle to record climate changes.Basically,changes of deposition rate of stalagmite are controlled by the summer solar radiation in Northern Hemisphere and ITCZ exerts directly influence on it.In centenniarl timescale,deposition rate of sedimentary cycle of stalagmite LH2 may relate to weak monsoon events occuring in the mid-late Holocene. -
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ZHANG Huiling, YU Kefu, ZHAO Jianxin, FENG Yuexing, LIN Yushi, ZHOU Wei, LIU Guohui. Variations in deposition rate of sedimentary cycle from a stalagmite in Lianhua Cave and its paleoclimatic implications during the mid-late Holocene[J]. Carsologica Sinica, 2017, (4): 580-590. doi: 10.11932/karst20170421
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