English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Both heavy mineral analysis and modal composition analysis were carried out for the same sandstones in the Late Cretaceous Terasoma Formation of the Shimanto Supergroup in the Kii Peninsula, Southwest Japan. Heavy mineral assemblages of the lower part of the Terasoma Formation are rich in zircon and garnet associated with epidote, titanite and allanite. In the upper part, Zircon is also abundant, but only minor amounts of garnet and anatase are contained. The modal composition of the sandstones from the lower Terasoma Formation are situated in the boundary zone between feldspathic and lithic wacke, and rich in K-feldper and granitic rock fragments. The sandstones from upper formation are more dominant in rock fragments, and belong to lithic wacke without exception. The provenances deduced from the heavy mineral composition are in accordance with the those from the modal composition ; the provenance of the sandstones in the lower Terasoma Formation was composed chiefly of granitic rocks, whereas in the upper part of the formation felsic volcanic rocks became predominant. Similar transition of sandstone composition in the middle Late Cretaceous is also recognized in the Soto-Izumi Group, which is situated in the north and correlated with the Terasoma Formation in age. Judging from the modal and chemical composition of sandstones from the Cretaceous Shimanto Supergroup in Japan, violent felsic magmatism took place in the provenance areas where granitic rocks were mainly exposed associated with minor andesitic vol-canism.

Transition of sandstone composition of the Cretaceous Terasoma Formation in the Shimanto Belt of the Kii Peninsula, and its significance