GEOCHRONOLOGY OF QUATERNARY TEPHRA DEPOSITS
GEOCHRONOLOGY OF QUATERNARY TEPHRA DEPOSITS
复制标题
第四纪火山灰矿床的地质年代学
DOI:
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发表时间:
1981
期刊:
影响因子:
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通讯作者:
G. Izett
中科院分区:
文献类型:
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作者:
C. Naeser;N. D. Briggs;J. Obradovich;G. Izett
Three radiometric methods have been used to date Quaternary tephra: fission-track (F-T), K-Ar, and radiocarbon (C-14). The fission-track and K~Ar methods provide direct ages for the tephra because they date phenocrysts from the source magma that were deposited by the eruption cloud. Radiocarbon dating provides only indirect ages because the carbon used in this method comes from material, such as pre-existing wood, included in the tephra during deposition or collected from underlying or overlying strata.