第80回ジオダイナミクスセミナー
　 　Geodynamics　Seminar

　　　　"Thermal structure of mid-ocean ridges"

　　　　　　　　　　　講師：　Y. John Chen
　　　　(Department of Geophysics, Peking University)　
　　　　　　　　　　　　　　　　　

　　　　　　主催　：　愛媛大学地球深部ダイナミクス研究センター
　　　 　 　日時　：　２００３年１１月７日（金）
　　　　　　場所　：　愛媛大学理学部講義棟　２０１教室

要　旨
　 Understanding the magmatic and tectonic process associated with the construction of new oceanic crust at mid-ocean ridges is important for us to understand the structure of oceanic crust and the evolution of the oceanic plate which carries the oceanic crust. Modelling the thermal structure of mid-ocean ridges is particularly important because (a) the rheological strength of the oceanic lithosphere is strongly temperature dependent and (b) the thermal structure at the ridge axis dictates the architecture of the oceanic crustal accretion process (the presence or not of a magma lens).
　This presentation will review the progresses from the previous modeling studies of mid-ocean ridge. I will focus on the three primary controlling parameters: spreading rate, mantle temperature (or magma supply), and hydrothermal cooling. In particular, I will present current thermal models for the genesis of oceanic crust and discuss the effect of anomalous mantle temperature (adjacent to a hotspot) on crustal genesis.






　　　　　　　　問い合わせ先：山崎　大輔 　TEL　　　（089）927-8408
　　　 　　　　　　　　　　　　　　　　E-mail　　yamazaki@sci.ehime-u.ac.jp