Sedimentological Characteristics of a Stalagmite from Shuinan Cav e,Guilin

Key words: 
• stalagmite /
• sedimentary /
• characteristics /
• age

Abstract: Stalagmites in cave are a better carrier of karst environment record,and the mature methods of the various datings and testing of the index showing environment has possessed at present for the re construction paleoenvironment using the preserved information of stalagmites in cave is one of the most popular project in recent 20 years.Under the forecast s t udy of the global climatic changes,the high resolution dating and the regular ch ange of carbon and oxygen isotopic component of stalagmites in cave have made a greater contribution for the breakthrough and filling in the gaps in the field. The sedimentary characteristics and the trend changes of paleo-drip records in stalagmite from Shuinan cave,Guilin are studied by examing composition of calcite,rock chemistry,content of the trace element,texture,bedding-stucture, as well as typical marks of depositional break or weathering crust ect.By dating U series along the axis cores of the stalagmite,the age of the stalagmite is fr om the late period of Middle Pleistocene to the early period of Late Pleistocene,i.e.,from 80.7×10³a to 229.1×10³a.The growth rate of the stalagmite varies from 2.08mm/100a to 2.82mm/100a.