澄江动物群产出层位^(40)Ar^(-39)Ar年龄谱  

^(40)Ar^(-39)Ar AGE SPECTRUM OF CHENGJIANG FAUNA HORIZON

作　　者：陈良忠[1] 蒋志文[1] 罗惠麟[1] 尹济云[1] 胡世学[1] 

机构地区：[1]云南省地质科学研究所,云南昆明650011

出　　处：《云南地质》2001年第3期289-296,共8页Yunnan Geology

基　　金：云南省重点基金项目 (97D0 0 7Z);国家攀登计划专项 (95 -专 - 0 1) .

摘　　要：澄江动物群 ,产于云南下寒武统筇竹寺组玉案山段黄绿色粉砂质页岩中 ,大部分风化较强 ,给同位素年龄测定带来困难。笔者应用4 0 Ar/ 39Ar快中子活化法 ,测得澄江地区大坡头剖面玉案山段下部伊利石4 0 Ar 39Ar年龄为 5 5 9 2 2± 0 77Ma ;晋宁地区昆阳磷矿剖面玉案山段下部伊利石4 0 Ar 39Ar年龄为 5 5 9 63± 0 98Ma。该年龄代表澄江动物群的下限同位素年龄值.The Chengjiang Fauna are occurred in the yellow green silty shale of Lower Cambrian Qiongzhusi Formation,Yuanshan Member of Yunnan,which is intensively weatherd.Therefore,it is difficultly,used for isotope dating.By the 40 Ar/ 39 Ar fast neutron activation analysis,the measured 40 Ar 39 Ar age of illite in black shale of Yuanshan Member of Dapotou section in Chengjiang area is 559 22±0 77Ma and that of illite of Yuanshan Member of Kunyang Phosphrous deposit section is 559 63±0 98Ma.They represent the lower limit of the isotope age of Chengjiang Fauna.

关 键 词：澄江动物群 产出层位 快中子活化法 年龄谱 氩同位素 下寒武统 

分 类 号：Q915.6[天文地球—古生物学与地层学] P597.3[生物学—古生物学]