Bulletin of the Geological Survey of Japan Vol.50 No.11 (1999)

Cover photograh | Table of Contents |

Cover photograh

A typical outcrop of quarry seen at Ryujin-yama, Ishioka city, Ibaraki. Secondary jarosite derived from pyrite in bedrock is observed as yellowish brown surface of alternation of sandstone and mudstone in Tsukuba Metamorphic Rocks.

(Photoed by Youji SEKI)

Table of Contents

Title	Author	PDF
Sulfur and carbon contents and ~3'S ratio of Miocene ilmenite-series granitoids: Osumi and Shibi-san plutons, Kyushu, SW Japan	hunso ISIHARA, Masahiko YAMAMOTO and Akira SASAKI (671-682)	50-11_01.pdf(5,496KB)
Relationship between geology and water quality of rock seepage from quarries – A case study around the Yamizo mountains –	Yoji SEKI, Yutaka KANAI, Hikari KAMIOKA, Katsuhiro TSUKIMURA, Satoshi HAMASAKI, Yasuo KANAZAWA and Terumasa NAKAJIMA (683-697)	50-11_02.pdf(2,280KB)
The evolution of pyroclasts in the post caldera stage of Towada volcano, northeast Japan	Miwa KURI and Kei KURITA (699-710)	50-11_03.pdf(2,634KB)
Twinning laws of plagioclase in Cretaceous granitoids of the Ryoke-Sanyo Belts and Tertiary granitoids of the Hidaka Metamorphic Belt	Yuhei TAKAHASHI (711-718)	50-11_04.pdf(869KB)
bstracts for Geological Survey Seminar No. 260 Poster session of the new geological maps published by GSJ (719-724)		50-11_05.pdf(843KB)