Late Cretaceous U/Pb zircon ages and Precambrian crustal inheritance in Ryoke granitoids, Kinki and Yanai districts
-
- Herzig C. T.
- Department of Geological Sciences, San Diego State University
-
- Kimbrough D. L.
- Department of Geological Sciences, San Diego State University
-
- Tainosho Y.
- Department of Geology, Faculty of Education, Kobe University
-
- Kagami H.
- Institute for Study of the Earth's Interior, Okayama University
-
- Iizumi S.
- Department of Geology, Faculty of Science, Shimane University
-
- Hayasaka Y.
- Institute of Geology and Mineralogy, Hiroshima University
書誌事項
- タイトル別名
-
- Late Cretaceous U/Pb zircon ages and Precambrian crustal inheritance in Ryoke granitoids, Kinki and Yanai districts, Japan.
- Late Cretaceous U Pb zircon ages and Pr
この論文をさがす
抄録
Ryoke granitoids on Ikoma-yama and Katsuragi-yama in the Kinki District, and on Yashiro-jima in the Yanai District, have Late Cretaceous zircon U/Pb isotopic crystallization ages. Older and Younger granites on Ikoma-yama were emplaced within a short time interval between 81 and 82 ± 1 Ma. Younger Ryoke granite on Katsuragi-yama, located south of Ikoma-yama, crystallized at 75 ± 3 Ma. The Gamano granodiorite and Kita-Oshima granite-gneiss on Yashiro-jima have overlapping crystallization ages of 95 to 96 ± 1 Ma. This result supports earlier ideas that the Gamano and Kita-Oshima rocks are cogenetic. An inherited component of Precambrian (1855 to 1953 Ma) radiogenic lead is present in some of the zircons from the Ryoke granitoids analyzed in this study. This result implies that older continental materials were assimilated into the granitic magmas. Possible sources include Precambrian basement or younger upper crustal rocks that contain recycled Precambrian detritus.
収録刊行物
-
- GEOCHEMICAL JOURNAL
-
GEOCHEMICAL JOURNAL 32 (1), 21-31, 1998
一般社団法人日本地球化学会
- Tweet
詳細情報 詳細情報について
-
- CRID
- 1390282679526625920
-
- NII論文ID
- 130003743357
- 10008802389
-
- NII書誌ID
- AA00654975
-
- COI
- 1:CAS:528:DyaK1cXitVSkur4%3D
-
- ISSN
- 18805973
- 00167002
-
- NDL書誌ID
- 4427745
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用不可