Provenance of the north Pacific sediments and process of source material transport as derived from Rb–Sr isotopic systematics
書誌事項
- 公開日
- 1999-06
- 権利情報
-
- https://www.elsevier.com/tdm/userlicense/1.0/
- DOI
-
- 10.1016/s0009-2541(99)00056-x
- 公開者
- Elsevier BV
この論文をさがす
説明
Abstract Rb–Sr isotopic systematics of 111 samples of sediments in nine cores from the north Pacific of Quaternary and Pliocene ages have been investigated. They provide information on the provenance, the process of particle transport and temporal variation in the flux of source material. The Rb–Sr isotopic systematics of the core sediments show well-correlated pseudo isochrons. The pseudo isochrons reflect the mixing of two types of material, i.e., the Asian continental material with high 87 Rb / 86 Sr ratios (4.5–6.5) and high 87 Sr / 86 Sr ratios (0.723–0.727) and the volcanic material with low 87 Rb / 86 Sr ratios and low 87 Sr / 86 Sr ratios, from island–arc volcanics such as the Izu–Ogasawara–Mariana and the Japanese Islands and oceanic islands such as the Hawaiian Islands (0.0–2.0; 0.703–0.708). The clearness of the pseudo isochrons implies that the Rb–Sr isotopic composition of the weathering products derived from the Asian continental crust is extremely homogenized. The fine fraction (a few μm) with a high 87 Rb / 86 Sr ratio (5.0–6.5) is widely transported into the north Pacific by the middle-latitude westerlies and contributes largely to pelagic sediments. The coarser fraction with a lower 87 Rb / 86 Sr ratio (
収録刊行物
-
- Chemical Geology
-
Chemical Geology 158 (3-4), 271-291, 1999-06
Elsevier BV
