Metallogenic study of Besshi-type volcanogenic massive sulfide deposit using a Re–Os dating method

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  • Nozaki Tatsuo
    Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Department of Systems Innovation, School of Engineering, The University of Tokyo

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Other Title
  • Re–Os年代測定法による硫化物鉱床の成因に関する研究
  • 2014年度日本地球化学会奨励賞受賞記念論文 Re-Os年代測定法による硫化物鉱床の成因に関する研究
  • 2014ネンド ニホン チキュウ カガッカイ ショウレイショウ ジュショウ キネン ロンブン Re-Os ネンダイ ソクテイホウ ニ ヨル リュウカブツ コウショウ ノ セイイン ニ カンスル ケンキュウ

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Description

Besshi-type deposit is a Cu–Zn (±Ag±Au) volcanogenic massive sulfide deposit occurring worldwide in the accretionary complexes, which is derived from seafloor mineralization related with a mid-ocean ridge volcanism. There are numerous Besshi-type deposits including the type locality in the Japanese accretionary complexes and they are one of the main Cu producers for the Japanese industry until 1980s. Despite of the long research history over 100 yr, the depositional environment and geological reason why Besshi-type deposits are unevenly distributed in the Japanese accretionary complexes are still uncertain due to the lack of direct age constraints for the timing of Besshi-type sulfide deposition on a paleo-seafloor. Here, we report the Re–Os isochron ages of Besshi-type deposits in the Sanbagawa, Northern Shimanto and Hitachi Belts. Eleven typical Besshi-type deposits in the Sanbagawa Belt yielded Re–Os isochron ages around 150 Ma (148.4±1.4 Ma from the composite isochron) in the Late Jurassic time. Since the depositional site of these Besshi-type deposits is truly pelagic, voluminous massive sulfide deposition/preservation in the Late Jurassic was considered to be triggered by intense hydrothermal activity with a concomitant Late Jurassic oceanic anoxic event. The three Besshi-type deposits in the Northern Shimanto Belt have been dated to be Late Cretaceous to Paleogene, which was closely associated with the Kula Ridge subduction beneath the Japanese Island. The Re–Os isochron age of the Fudotaki deposit in the Hitachi Belt was 533±13 Ma, indicating that the Hitachi Fudotaki deposit is the oldest ore deposit in the Japanese Island and was produced by bimodal volcanic activity on a back-arc area between the China block and the subduction belt of the Panthalassa Ocean.

Journal

  • Chikyukagaku

    Chikyukagaku 49 (2), 65-78, 2015

    The Geochemical Society of Japan

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