This workshop will comprise a 1-day symposium in Tokyo followed by a 7 day field traverse across the NE Honshu volcanic arc, from the arc front (Ou Backbone range) through the Hokuroku (kuroko) district to the back-arc side (Oga Peninsula). The field trip will emphasize the setting and timing of kuroko deposits within the evolution of the NE Honshu arc and back-arc rift.
The aim of the workshop is to discuss the relationships in time and space between the formation of VMS ore deposits and the evolution of marine volcanic arcs. We will be a group of field geologists, modern seafloor specialists, igneous petrologists, ore deposit geologists and geochemists, with the aim of learning from eachother. Our common interests are marine hydrothermal systems, VMS ore deposits and their relationship to the tectonic and magmatic evolution of arc-backarc systems. NE Japan is an excellent place to observe and discuss the critical issues. Japanese scientists have good knowledge of both the structural and magmatic evolution of the Honshu arc-backarc system and have recently made important steps forward in correlating the stratigraphy of the VMS host successions with evolution of the volcanic arc.
We will use IGCP-UNESCO funds to invite some scientists from developing countries.
Organisers and field trip leaders:
Tetsuro Urabe, Hiroshi Sato (The University of Tokyo)
Takeyoshi Yoshida, Ryoichi Yamada (Tohoku University)
Toshio Mizuta, Daizo Ishiyama (Akita University)
Takeshi Ohguchi, Kin-ichi Okamoto, Tsutomu Kishi (Akita Prefectural Government)
Rodney Allen (Boliden Mineral and Lulea University, Sweden)
PROGRAM FOR SYMPOSIUM
Earthquake Research Institute, The University of Tokyo
(1st Building, Seminar Room, 3rd floor)
27 October
| 9:00-9:05 | Opening Remarks (R.Allen) |
| 9:05-9:10 | Welcome and instructions to foreign participants (T.Urabe,T.Yoshida) |
| Oral Presentation | |
| 9:10-9:35 | Tectonic framework and evolution of the NE Honshu arc during the Cenozoic (H. Sato and N. Kato) |
| 9:35-10:00 | Magmatism of the NE Honshu arc during the Late Cenozoic (T. Yoshida) |
| 10:00-10:25 | Present-day seafloor hydrothermal activity in arc-backarc settings (T. Urabe) |
| 10:25-10:50 | Chemistry of mineralization and fluids in submarine systems, Okinawa Trough (J. Ishibashi) |
| 10:50-11:15 | Interpretation of chimneys and clastic sulphides (V. Maslennikov) |
| 11:15-11:40 | Kuroko deposits and magmatic evolution in the NE Honshu arc (R. Yamada) |
| 11:40-12:00 | Discussion |
| (lunch break) | |
| 13:00-13:25 | Physical volcanology of kuroko deposits, Hokuroku district (R. Allen) |
| 13:25-13:50 | Mineralization and alteration of the kaolinite-bearing gold-rich Nurukawa kuroko deposit, Aomori Prefecture (D. Ishiyama) |
| 13:50-14:15 | Tectonic-volcanic setting and timing of VMS in the Iberian Pyrite Belt (F. Tornos) |
| 14:15-14:40 | Geodynamic evolution of the Abitibi and the LaRonde VMS deposit (P. Mercier-Langevin) |
| (Coffee break) | |
| 15:00-15:25 | Genetic association between bimodal plutonism and massive sulphides, Morocco (A. Essaifi) |
| 15:25-15:50 | VMS deposits in south and southeast Iran (Alireza Monazami) |
| 15.50-16:15 | Polymetallic sulphide deposits in Bergslagen, Sweden (E. Lundstam) |
| 16:15-16.45 | Discussion and posters |
Map showing the location of the symposium
