• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Geochemical Studies on Basic Rocks Accompanied with Massive Sulfide Deposits

Research Project

Project/Area Number 63540656
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 InstitutionWaseda University

Principal Investigator

MARIKO Tadashi  Waseda University, School of Education, Professor, 教育学部, 教授 (00063454)

Co-Investigator(Kenkyū-buntansha) OGASAWARA Yoshihide  Waseda University, School of Education, Assistant Professor, 教育学部, 助教授 (70160736)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1990: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1989: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1988: ¥600,000 (Direct Cost: ¥600,000)
KeywordsMeta volcanics / Mid-ocean ridge basalt / Calc-alkali rocks / Boninite / Back-arc basalt / Oceanic island alkali basal / Oceanic island tholeiite / Massive sulfide deposits / 三波川変成岩 / 別子型鉱床 / 塩基性片岩 / 海嶺型玄武岩 / 海洋島型ソレアイト / 海洋島型アルカリ玄武岩 / 下川塩基性岩 / 日立変成岩 / 島孤型火山岩 / 縁海 / 海嶺ソレアイト / 単斜輝石の化学組成 / 全岩組成
Research Abstract

Geological survey and chemical analyses of main and minor components of Shimokawa basic rocks, Hitachi metamorphic rocks and Sanbagawa metamorphic rocks which contain altered and/or metamorphosed rocks derived from basic volcanic rocks accompanied with massive sulfide deposits were carried out. The results are summarized as follows.
1) All Shimokawa basic rocks are considered to be N-type mid-ocean ridge basalt (MORB). They have, however, larger amounts of low ion-potential LIL elements compared with the recent N-type MORB. This is explained by addition of the elements associated with the sea-floor alteration or contamination with pelitic rocks. The similar phenomena are observed in the present day sea-floor basalt from Guaymus basin, Gulf of California.
2) Hitachi metamorphic rocks contain schist and gneiss derived from acidic-intermediate-basic volcanic rocks. The geochemical properties suggest that they consist of calc-alkalic, boninitic and back-arc volcanic rocks.
3) Most of basic schists in the Sanbagawa metamorphic terrain of Kanto Mountains are N- and T-type MORB. The others are oceanic island tholeiite and alkali basalt.
4) Chemical compositions of the rock specimens from Shimokawa, Hitachi and Sanbagawa are considered to have changed sea-floor alteration or regional metamorphism. Among main and minor components of the rocks Na_2O, K_2O, CaO, Sr, Rb are relatively mobile. In contrast, FeO*, MgO, SiO _2, Nb, Ti, Y are immobile. On the basis of the relative and absolute quantity of these immobile elements, tectonic settings of altered and/or metamorphic rocs derived from volcanic rocks in geologic times are estimated.

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] MARIKO, T.: "Ores and one minerals from the volcavogenic massove sulfide deposits of the Shimokawa mine, Hokkaido, Japan" Miming Geology. 38. 233-246 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] MARIKO, T.: "Volcansgenic massine ruefile deposits of Besshi type at the Shimokawa mine, Hokkaido, novthern Japan" Procedings of the 7th JAGOD Symposium. 501-512 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 鞠子 正: "下川層状硫化物鉱床の成因" 月刊地球科学. 20. 239-244 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Mariko, T.: "Ores and ore minerals from the volcanogenic massive sulfide deposits of the Shimokawa mine, Hokkaido, Japan" Mining Geology. Vol. 38. 233-246 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Mariko, T.: "Volcanogenic massive sulphide deposits of Besshi type at the Shimokawa mine, Hokkaido, northern Japan." Proceedings of the 7th IAGOD Symposium. 501-512 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Mariko, T.: "Genesis of the Shimokawa bedded sulfide deposit." Gekkan Chikyu. Vol. 20. 239-244 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary

URL: 

Published: 1988-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi