Japan Geoscience Union Meeting 2019

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[J] Oral

S (Solid Earth Sciences ) » S-GL Geology

[S-GL27] Geochronology and Isotope Geology

Thu. May 30, 2019 10:45 AM - 12:15 PM A10 (TOKYO BAY MAKUHARI HALL)

convener:Takahiro Tagami(Graduate School of Science, Kyoto University), Yuji Sano(Division of Ocean and Earth Systems, Atmosphere and Ocean Research Institute, University of Tokyo), Chairperson:Yuji Sano, Takahiro Tagami

11:45 AM - 12:15 PM

[SGL27-09] Radiometric ages vs. astrophysical ages -with regard to the numerical age in the International Stratigraphic Chart

★Invited Papers

*Ichiro Kaneoka1 (1.Earthquake Research Institute, University of Tokyo)

Keywords:International Stratigraphic Chart, numerical age value, effective numerical value, astrophysical age, radiometric age

In July, 2018, ICS(International Stratigraphy Commission) of IUGS published the new International Stratigraphic Chart (ISC: v.2018/07). The author drew an attention to the public about some issues to be cautioned on the usage of numerical ages in the ISC based on the 2009 version(v.2009/08) at the JpGU before (Kaneoka, 2016). The essential points do not change between the two versions of ISC, but there are some differences in the representation of numerical ages in the new ISC. Here, the author comments some points about them and discuss issues of astrophysical and radiometric ages used in the ISC.