Lasing on pyroclastic rocks:A case study of ^(40)Ar/^(39)Ar dating on Moshishan Group,eastern Zhejiang Province

查看全文 作　　者：YANG [1,2]LieKun;WANG [1]Fei;SHEN [3]JiaLin;CHEN [3]Rong;XING [3]GuangFu

机构地区：[1]State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;[2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China;[3]Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China

出　　处：《Chinese Science Bulletin》索引2008年第53卷第24期,共7页

基　　金：Supported by National Natural Science Foundation of China (Grant Nos.40221402,40673048 and 90714007) 摘　　要：It is difficult to date pyroclastic rocks,for almost all the dating methods,due to the multiple sources during their formation.40Ar/39Ar incremental heating results on groundmass selected from the samples show that the age spectra are meaningless geologically.However,singe crystal total fusions of CO2 lasing on the sanidine separates could yield rational 40Ar/39Ar results and distinguish their sources in this study.Timing on three formations of the Moshishan Group,after avoiding the exotic and altered grains by lasing on the single sanidine separate,was reported in this paper.The lowermost portion of the Chawan Formation gives an age of 113.7±0.3 Ma;the lower part of the Xishantou Formation was formed 116.4±0.4 Ma ago and the bottom of the Gaowu Formation took its shape at 118.4±0.4 Ma.These new ages are much younger than the previous ones,suggesting that these thick volcanic formations had been formed in very short durations. 关键词：火山岩透长岩肌理浙江山脉

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Lasing on pyroclastic rocks:A case study of ^(40)Ar/^(39)Ar dating on Moshishan Group,eastern Zhejiang Province

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