Study on High-Resolution Carbon, Oxygen Isotope and Trace Element Records and Paleoclimate from Heshang Cave, the Middle Reach of the Yangtse River

HUANG Jun-hua; HU Chao-yong; ZHOU Qun-feng; YANG Gui-fang

Through a combined analysis of sedimentary characteristics,C and Oisotopes,Mg and Sr trace elements of a stalagmite from Heshang Cave,Hubei,Wit h urani um-series dating，t he palaeoclimatic and palaeoenvironmental Information from19.0ka to 6.9ka i n the Hubei area is obtained.The average resolution is 17a,and t he local resolution is 7a. The following results are obtained ：(1)f rom 19.0 ~16.6ka B.P. ：C and Oisotopes Were lighter,the climate Was cold and Wet ；(2)16.6 ~11.1kaB.P. ：C，Oisotopes Were a little heavy,temperature rose,r ain fall Was inclined to be little ；(3)11.1 ~10.3ka B.P. ：an excursion during dry and hot period responded to the Younger Dryas Event ；(4)10.3 ~6.9 ka B.P：C，O，I sotopes Were lighter,but Mg/Sr value Was bigger,showing temperature Was continuously rising and rain f all Was greater. These reflect the variation tends from humid-cold climate，to dry- hot climate，and to humid,War mcli mate in history,and some climatic variation trends of thousand years and hundred years cycles are gainned. I n particular the authors found out the integrated record of the Younger Dryas Event Which means the Younger Dryas Event is a globally climatic sudden change and environmental calamity.

Test Center,China University of Geosciences,Wuhan,430074

Received Date: 2002-01-09

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Abstract: Through a combined analysis of sedimentary characteristics,C and Oisotopes,Mg and Sr trace elements of a stalagmite from Heshang Cave,Hubei,Wit h urani um-series dating，t he palaeoclimatic and palaeoenvironmental Information from19.0ka to 6.9ka i n the Hubei area is obtained.The average resolution is 17a,and t he local resolution is 7a. The following results are obtained ：(1)f rom 19.0 ~16.6ka B.P. ：C and Oisotopes Were lighter,the climate Was cold and Wet ；(2)16.6 ~11.1kaB.P. ：C，Oisotopes Were a little heavy,temperature rose,r ain fall Was inclined to be little ；(3)11.1 ~10.3ka B.P. ：an excursion during dry and hot period responded to the Younger Dryas Event ；(4)10.3 ~6.9 ka B.P：C，O，I sotopes Were lighter,but Mg/Sr value Was bigger,showing temperature Was continuously rising and rain f all Was greater. These reflect the variation tends from humid-cold climate，to dry- hot climate，and to humid,War mcli mate in history,and some climatic variation trends of thousand years and hundred years cycles are gainned. I n particular the authors found out the integrated record of the Younger Dryas Event Which means the Younger Dryas Event is a globally climatic sudden change and environmental calamity.

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Study on High-Resolution Carbon, Oxygen Isotope and Trace Element Records and Paleoclimate from Heshang Cave, the Middle Reach of the Yangtse River

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