摘要:
利用组成石笋的方解石成分、岩石化学、微量元素含量以及结构、层面构造、沉积间断或风化壳等特征标志,阐述桂林水南洞石笋的沉积特征以及古滴水动态变化.经铀系法测年,确定石笋形成于中更新世晚期至晚更新世早期,其年龄为8.07万年至22.91万年,经历了14.84万年,沉积速率为2.08~2.82mm/100a(未扣除间断时间).
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.
点击查看大图
下载:
