%0 Journal Article
%T Using 210Pb Technique to Determine the Closure of Young Stalagmites<br>用210Pb技术判断年轻石笋封闭性研究
%A YIN Jian-jun
%A LIN Yu-shi
%A QIN Jia-ming
%A WANG Hua
%A TANG Wei
%A <br>殷建军
%A 林玉石
%A 覃嘉铭
%A 王华
%A 唐伟
%J 地球学报
%D 2012
%I 
%X Based on analyzing the 210Pb specific radioactivity of two nearby stalagmites DY-2 and DY-3 in the same cave named Maomaotoudayan cave in Guilin City, the authors obtained the following understanding: (1) although they have grown in the same cave and their distance is about 1.5 meters, the initial 210Pb specific radioactivity of DY-2 is 2 times higher than that of DY-3, and the 210Pb specific radioactivity of DY-2 is 0.7 times higher than that of DY-3 in modern sediments. And the drip monitoring also certified that the deposition rate of DY-3 is faster than that of DY-2 stalagmite, indicating that the 210Pb specific radioactivity could be used as a tool to determine the deposition rate in the same geological background and geographic environment; (2) both of the two stalagmites show fluctuation in the 210Pb specific radioactivity profiles, related to the distribution, size and density of intercrystal porosity, the disturbed DY-3 profile might be attributed to the existence of pores in the stalagmite and the mixture of later 210Pb with the former 210Pb; (3) the problem whether there is an oxygen isotope fractionation in the open system needs further study.
%K 210Pb specific radioactivity
%K intercrystal porosity
%K closure
%K deposition rate<br>210Pb放射性活度
%K 晶间孔隙
%K 封闭性
%K 沉积速率
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=1DF69A47DE80569EC8F859DF61571180&aid=DC0994A58AFB6AE9016F2EEB8676736C&yid=99E9153A83D4CB11&vid=27746BCEEE58E9DC&iid=B31275AF3241DB2D&sid=27A5865B8C0B85C3&eid=7C8C2BAFC9BA0571&journal_id=1006-3021&journal_name=地球学报&referenced_num=0&reference_num=0