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Lead-Zinc Mineralization and Related Granitic Rocks, Tsushima Islands, Nagaski Prefecture

Research Project

Project/Area Number 01540664
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 鉱物学(含岩石・鉱床学)
Research InstitutionKyushu University

Principal Investigator

SHIMADA Nobutaka  Institution, Department : Kyushu Univ., Fac. of Sci. Title of Position : Professor, 理学部, 教授 (00037235)

Co-Investigator(Kenkyū-buntansha) FUKUOKA Masato  Institution, Department : Kyuushu Univ., Fac. of Sci. Title of Position : Assist, 理学部, 助手 (70117232)
MOTOMURA Yoshinobu  Institution, Department : Kyushu Univ., Fac. of Sci. Title of Position : Assista, 理学部, 助手 (20037237)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1990: ¥700,000 (Direct Cost: ¥700,000)
KeywordsTsushima Islands / Granitic rocks / Magnetic susceptibility / Fluid inclusions / Lead-zinc mineralization / Cobaltite / 鉱脈 / ゾ-ニング / 対馬内山花こう岩体 / 流体含有物 / 花こう岩類
Research Abstract

The present study has made physicochemical characterization on the Uchiyama granitic body, which intrudes into the Paleogene Taishu Group, and also clarified mineralization features of veins developed in both Ohfunakoshi and Sasu areas, Shimojima, Tsushima Islands, Nagasaki prefecture. In the granitic body, magmatic susceptibility values measured by means of kappermeter, KT-5, range widely from 2x10^<-6> to 922x10^<-6> emu/g. The values display zonal arrangement which forms higher magnetic susceptibility in the core of the body to lower in the peripheral part close to mudstone-rich Lower Formation of the Taishu Group. From analyses of vein structure, mineral association and ore textures on the new outcrops of the veins, mineralization features of the Ohfunakoshi area can be regarded to correspond to those of Yasuda and Taisho deposits in the Sasu area. At the southern part of Sasu, cobaltite was firstly identified in a quartz-pyrite vein at the Tenkuma Prospect. The fact suggests that Co-Bi zone can be settled between tourmaline-greisen zone and iron-sulfide zone in the sense of district zoning, and the zone probably extends to the Yora-Naiin area. Fluid inclusions in quartz of the Uchiyama granitic body show homogenization temperatures in the range of 300 to 520^゚ C, and salinity with 38 to 61 wt% NaCl equivalents, and those in quartz of Ohfunakoshi vein groups 220 to 380^゚ C and 2.4 to 6.4wt%. The fluid inclusion study of both granitic rocks and vein minerals strongly supports a genetical model that high temperatures and high saline fluids were derived from the Uchiyama granitic magma, and mixed gradually with meteoric water to form distric zoning of lead-zinc sulfide mineralizations at Shimojima, Tsushima Islands.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 島田 允尭・大山 洋一: "長崎県対馬の花こう岩体の帯磁率累帯配列について" 鉱山地質.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Shimada, Nobutaka and Ohyama, Youichi: "Zonal arrangement of magnetic susceptibility at the Uchiyama granitic body, Tsushima Islands, Nagasaki Prefecture, Japan" Minig Geology.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 島田 允尭・大山 洋一: "長崎県対馬の花こう岩体の帯磁率累帯配列について" 鉱山地質.

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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