2006 대한지질학회 추계학술발표회 초록집 • • 1
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특 강10월 26일(목)
CHIKYU and Japanese Science Plan in IODP
Yoshiyuki Tatsumi
Institute for Research on Earth Evolution(IFREE)
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), [email protected]
The Integrated Ocean Drilling Program (IODP) commenced as of October 1st, 2003, after several years of preparation. This internationally-operated large scientific program that we Earth scientists first experience aims toward a comprehensive understanding of the dynamic Earth system through deep-sea drilling. IODP is fundamentally distinct from earlier drilling projects such as Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) in that Japan and US both provide drilling vessels and operate the program as equal partners.
Deep Sea Drilling Vessel (D/V) CHIKYU is the first riser equipped scientific drilling vessel built for science at the planning stage. It is capable of drilling up to 7,000m deep sea floor and aim to the mantle and seismogenic zone. CHIKYU explores the Earth as the main plat form of the Integrated Ocean Drilling Program (IODP).
Based on discussions at several international workshops held over the last 15 years, the Initial Science Plan (ISP) for IODP was published in 2001 and includes the following three major scientific objectives:
1) Research on the subsurface biosphere and subseafloor ocean
2) Research on paleo-environmental changes and their effects on the biosphere 3) Research on the dynamism and evolution of the solid Earth
In addition to the IODP-ISP, the Japan National Committee for Promotion of IODP Sciences, as an equal partner in the IODP science operation, published the Japanese Initial Science Plan (J-ISP) in November of 2002 and nominated the following scientific targets that Japanese scientists should initially involve:
A) Mantle processes and Earth system evolution
- Understanding the role of Cretaceous core/mantle activity in environmental change, by deep-drilling of the giant oceanic plateaus in the western Pacific Ocean.
- Understanding material circulation in the greenhouse Earth and the detailed processes from greenhouse to ice Earth conditions, by drilling into Cretaceous to Cenozoic oceanic sediments B) Crustal processes and Earth system evolution
- Understanding the processes of continental crust formation, by deep drilling in oceanic arcs - Understanding the evolution of oceanic lithosphere, by deep drilling at backarc spreading
systems
- Understanding the linkage between continent, ocean and atmosphere, by drilling sedimentary records on marginal sea floors and continental slopes in eastern Asia
C) Dynamics and material circulation in subduction zones and Earth system evolution - Understanding the circulation of organic materials and the evolution of subsurface biosphere
in accretionary prisms
- Understanding the processes occurring in seismogenic zones
- Understanding the biology of microorganisms in deep accretionary prisms D) Long-term borehole monitoring
E) Deep biosphere
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