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Seasonal variations and environmental controls on stalagmite calcite crystal growth in Heshang Cave,central China

Chinese Science Bulletin 2010年第34期55卷 3929-3935页

作者： ruan jiaoyang hu chaoyong Key Laboratory of Biogeology and Environmental Geology of the Ministry of Education (China University of Geosciences) Wuhan 430074China

Stalagmite growth rates are usually considered to reflect changes in paleoclimate and ***,how exactly growth rates are affected by climate and environment is still *** launched a monitoring and modeling program that lasted approximately 4 years on two active drip sites in Heshang Cave,central *** collected comprehensive quantitative data on growth rates,cave temperature,CO2 concentration,drip rate and drip-water chemistry to better understand the relationship between stalagmite growth and cave *** laying out glass substrates,we successfully grew stalagmite calcite crystals with rhombic characteristics,and quantified growth rates by measuring the long and short axes of calcite crystals under a *** with coeval environmental data,we explicitly examined the roles of cave temperature,drip rate and drip-water chemistry in controlling the micro-scale growth of stalagmite *** show that growth of stalagmite calcite crystals at two drip sites exhibited similar seasonal variations - generally faster in the summer months,at ～3 μm d-1,and slower during the late winter to early spring,at ～1.5 μm *** in calcite growth rates were mainly determined by changes in cave temperature,with the growth rate increasing by 8.1%/°C and 6.6%/°C at the two *** indicates the potential use of stalagmite growth rates as a seasonal-resolution paleo-temperature proxy in some ventilated *** the other hand,the effect of drip rate and drip-water Ca2+ and SIC values on growth rates were not significant.

关键词：方解石晶体洞穴石笋环境控制晶体生长季节变化中国二氧化碳浓度增长率

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