著者

冨永 健 薬袋 佳孝 三津橋 務 岡崎 康治 鵜澤 淑子 浜野 洋三 矢内 敏明 村上 哲明 平原 茂子 伊藤 義治 下園 文雄

出版者

東京大学大学院理学系研究科・理学部

雑誌

東京大学大学院理学系研究科・理学部廣報

巻号頁・発行日

vol.27, no.1, pp.18-27, 1996-03

---

本郷1956--1996/富永健先生、ありがとうございました/東大を去るにあたって/三津橋 務先生を送る/思い出すこと/鵜沢淑子さんのこと/植物園での3年/矢内敏明事務主任を送るにあたって/私と植物園:思いでふたつ/伊藤さんを送る

著者

松本 良 薬袋 佳孝

出版者

The Sedimentological Society of Japan

雑誌

堆積学研究会報 (ISSN:18844715)

巻号頁・発行日

vol.21, no.21, pp.1-9, 1985-03-01 (Released:2010-05-27)

参考文献数

15

---

Manganese content of the deep sea sediments increases with decreasing the rate of sedimentation. This is interpreted as dilution of hydrogenous manganese, which accumulates at constant rate, by various amounts of terrigenous, biogenic and volcaniclastic materials. Deep sea sediments on and around the East Pacific Rise show strong negastive Ceanomaly, while brown clay and blue clay in the West, North and South Pacific show normal REE pattern.On the basis of the relation between Mn content and sedimentation rate, and the REE patterns (Ce anormaly and La/Yb ratio), deep sea sediments are classified into four types. They are 1) Type I, which deposits near land and is characterized by abundant terrigenous suites, 2) Type II, which deposits on abyssal plain very far from land and spreading center, 3) Type III, which deposits on and around active spreading ridge and is characterized by hydrothermal and volcaniclastic materials, and 4) Type IV, which deposits around active spreading ridge near land. Type IV is a mixed type of Type I and Type III.