Strontium isotopic age and the origin of including basalt pebbles of the Sashida Limestone in south Izu region, Japan. : New knowledge about the geohistory of the Izu Peninsula (Part 2)
In the previous paper, the geological ages of the Late Cretaceous, Paleocene, late Middle to Late Eocene, Oligocene and early Early Miocene were confirmed at the first time, based on the occurrences of both the age diagnostic larger foraminifera and associated planktonic foraminifera, from the Sashi...
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ftsaitamaunivir:oai:sucra.repo.nii.ac.jp:02000004 2023-10-09T21:55:24+02:00 Strontium isotopic age and the origin of including basalt pebbles of the Sashida Limestone in south Izu region, Japan. : New knowledge about the geohistory of the Izu Peninsula (Part 2) 南伊豆差田石灰岩のSr 同位体年代および含有される玄武岩礫の起源 : 伊豆半島地史に関する新知見(その2) 八木, 正彦 ヤギ, マサヒコ 松丸, 国照 2022-05 application/pdf https://sucra.repo.nii.ac.jp/record/2000004/files/A3000474.pdf eng jpn eng jpn 石油技術協会誌 3 87 227 236 Journal of the Japanese Association for Petroleum Technology 03709868 AN00130976 https://sucra.repo.nii.ac.jp/record/2000004/files/A3000474.pdf Sashida Limestone Izu Peninsula Late Cretaceous Early Oligocene Sr isotope age alkali basalt series Izu landmass Shikoku Basin spreading VoR 2022 ftsaitamaunivir 2023-09-20T16:54:48Z In the previous paper, the geological ages of the Late Cretaceous, Paleocene, late Middle to Late Eocene, Oligocene and early Early Miocene were confirmed at the first time, based on the occurrences of both the age diagnostic larger foraminifera and associated planktonic foraminifera, from the Sashida Limestone included basalt pebbles, Sashida, Kamo-Gun, south Izu Peninsula. Therefore, the Sashida Limestone was made up of clastic carbonate rocks of various ages in essence as well as in outward form. In this paper, the age determination by the microfossil of larger and planktonic foraminifera was re-investigated by the Sr isotopic age determination from the same microfossil sample materials of the Sashida Limestone in order to get the age security. As a result, the ages from 69.3 to 71.8 Ma( Late Cretaceous; Maastrichtian) and 28.8 to 33.3 Ma (Early Oligocene;Rupelian) were determined and supported the ages of foraminifera partial. While, analysis of chemical composition of the basalt pebbles was investigated in order to estimate the original generation tectonics. As a result, the basalt pebbles showed a unique composition of high magnesium and high alkali, similar to basalts of the lower Yugashima Group and were assigned to the alkali basalt series, which were thought to have emerged in the very early stage of the Shikoku Basin spreading. The antecedent of the Izu Peninsula was dened as the Izu landmass from the previous paper, which was inferred the lateral mobility toward east from the spreading, and the last, bordered on the north by the Honshu. ©2022 JAPT 発行元の許可を得て掲載しています。 text application/pdf journal article Other/Unknown Material Planktonic foraminifera Saitama University Cyber Repository of Academic Resources (SUCRA) |
institution |
Open Polar |
collection |
Saitama University Cyber Repository of Academic Resources (SUCRA) |
op_collection_id |
ftsaitamaunivir |
language |
English Japanese |
topic |
Sashida Limestone Izu Peninsula Late Cretaceous Early Oligocene Sr isotope age alkali basalt series Izu landmass Shikoku Basin spreading |
spellingShingle |
Sashida Limestone Izu Peninsula Late Cretaceous Early Oligocene Sr isotope age alkali basalt series Izu landmass Shikoku Basin spreading 八木, 正彦 ヤギ, マサヒコ 松丸, 国照 Strontium isotopic age and the origin of including basalt pebbles of the Sashida Limestone in south Izu region, Japan. : New knowledge about the geohistory of the Izu Peninsula (Part 2) |
topic_facet |
Sashida Limestone Izu Peninsula Late Cretaceous Early Oligocene Sr isotope age alkali basalt series Izu landmass Shikoku Basin spreading |
description |
In the previous paper, the geological ages of the Late Cretaceous, Paleocene, late Middle to Late Eocene, Oligocene and early Early Miocene were confirmed at the first time, based on the occurrences of both the age diagnostic larger foraminifera and associated planktonic foraminifera, from the Sashida Limestone included basalt pebbles, Sashida, Kamo-Gun, south Izu Peninsula. Therefore, the Sashida Limestone was made up of clastic carbonate rocks of various ages in essence as well as in outward form. In this paper, the age determination by the microfossil of larger and planktonic foraminifera was re-investigated by the Sr isotopic age determination from the same microfossil sample materials of the Sashida Limestone in order to get the age security. As a result, the ages from 69.3 to 71.8 Ma( Late Cretaceous; Maastrichtian) and 28.8 to 33.3 Ma (Early Oligocene;Rupelian) were determined and supported the ages of foraminifera partial. While, analysis of chemical composition of the basalt pebbles was investigated in order to estimate the original generation tectonics. As a result, the basalt pebbles showed a unique composition of high magnesium and high alkali, similar to basalts of the lower Yugashima Group and were assigned to the alkali basalt series, which were thought to have emerged in the very early stage of the Shikoku Basin spreading. The antecedent of the Izu Peninsula was dened as the Izu landmass from the previous paper, which was inferred the lateral mobility toward east from the spreading, and the last, bordered on the north by the Honshu. ©2022 JAPT 発行元の許可を得て掲載しています。 text application/pdf journal article |
format |
Other/Unknown Material |
author |
八木, 正彦 ヤギ, マサヒコ 松丸, 国照 |
author_facet |
八木, 正彦 ヤギ, マサヒコ 松丸, 国照 |
author_sort |
八木, 正彦 |
title |
Strontium isotopic age and the origin of including basalt pebbles of the Sashida Limestone in south Izu region, Japan. : New knowledge about the geohistory of the Izu Peninsula (Part 2) |
title_short |
Strontium isotopic age and the origin of including basalt pebbles of the Sashida Limestone in south Izu region, Japan. : New knowledge about the geohistory of the Izu Peninsula (Part 2) |
title_full |
Strontium isotopic age and the origin of including basalt pebbles of the Sashida Limestone in south Izu region, Japan. : New knowledge about the geohistory of the Izu Peninsula (Part 2) |
title_fullStr |
Strontium isotopic age and the origin of including basalt pebbles of the Sashida Limestone in south Izu region, Japan. : New knowledge about the geohistory of the Izu Peninsula (Part 2) |
title_full_unstemmed |
Strontium isotopic age and the origin of including basalt pebbles of the Sashida Limestone in south Izu region, Japan. : New knowledge about the geohistory of the Izu Peninsula (Part 2) |
title_sort |
strontium isotopic age and the origin of including basalt pebbles of the sashida limestone in south izu region, japan. : new knowledge about the geohistory of the izu peninsula (part 2) |
publishDate |
2022 |
url |
https://sucra.repo.nii.ac.jp/record/2000004/files/A3000474.pdf |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
石油技術協会誌 3 87 227 236 Journal of the Japanese Association for Petroleum Technology 03709868 AN00130976 https://sucra.repo.nii.ac.jp/record/2000004/files/A3000474.pdf |
_version_ |
1779319290475839488 |