BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN
Online ISSN : 2186-490X
Print ISSN : 1346-4272
ISSN-L : 1346-4272
Current issue
Displaying 1-2 of 2 articles from this issue
Report
  • Toshio KAWAMURA, Takayuki UCHINO
    Article type: Report
    2024 Volume 75 Issue 2 Pages 61-72
    Published: June 16, 2024
    Released on J-STAGE: June 15, 2024
    JOURNAL FREE ACCESS

    Carboniferous strata of the South Kitakami Belt in Northeast Japan contain large volumes of volcaniclastic rocks that indicate intense volcanism. We conducted zircon U–Pb dating on samples collected from two stratigraphic horizons: coarse felsic tuff from the middle part of the lower Carboniferous Shittakazawa Formation, and sandy tuff from the middle part of the upper Carboniferous Kidoguchi Formation. The samples yielded weighted mean ages of 339.5 ± 2.6 Ma (middle Visean) and 313.6 ± 2.3 Ma (early Moscovian), respectively. The former age is more tightly constrained and slightly younger than the late Tournaisian age previously determined using fossil biostratigraphy and lithostratigraphic correlations. The latter age indicates that volcanism was ongoing throughout the late Carboniferous. Taking into account the occurrence of late Carboniferous granitic rocks and earliest Permian andesitic tuff in the South Kitakami Belt, our results suggest that igneous activity lasted from the Carboniferous to early Permian.

    Download PDF (13915K)
  • Masanori SHIRO, Ayumu MIYAKAWA, Tsukasa FUJITA, Masanao OCHI, Yuichi I ...
    Article type: Report
    2024 Volume 75 Issue 2 Pages 73-81
    Published: June 06, 2024
    Released on J-STAGE: June 15, 2024
    JOURNAL FREE ACCESS

    This study proposes a new system, "Ask AnyOne", that aims to facilitate collaboration among researchers with diverse specializations within research organizations. This system enables researchers embarking on studies in new fields to ask questions about fields outside their expertise easily and receive responses from relevant experts quickly, thereby minimizing their burden. Recognizing the importance of collaboration among researchers with diverse specializations within research organizations and the need to address temporal and psychological costs, we focus on improving the shortcomings of existing systems. We analyzed the problems with existing systems and designed a system that allows collaboration through questions and answers. Subsequently, we verified the effectiveness and utility of the system through operational tests in a small-scale organization. In particular, we analyzed the trends of questions and answers and considered the effectiveness and prospects of the system. Our findings indicate that this system has the potential to facilitate communication and collaboration among researchers, thereby enhancing the quality and efficiency of research.

    Download PDF (831K)
feedback
Top