第20回ジオダイナミクスセミナー
　　　Geodynamics　Seminar

　“The thermo-chemical structure and evolution
　　of the mantle-plate system：steps towards
　　an integrated model”

　　　　　　　　　　　　　 　　　
　　講　師：Dr. Paul Tackley (Dept. of Earth
　　　　　　and Space Sci, UCLA）
　　　
　　　　　主催　：　愛媛大学地球深部ダイナミクス研究センター
　　　　　日時　：　２００１年１０月２０日　（土）　午後1時〜
　　　　　場所　：　愛媛大学理学部講義棟　２０１教室


　　　　　　　　

要　旨
Mantle convection and plate tectonics are two aspects of a single,
complex system that is both thermal and chemical, involving interplays
between multiple rheological behaviors and the complementary processes
of chemical differentiation and mixing. This talk will focus on two
steps towards the development of an integrated numerical model of these
processes. Firstly, comparisons between numerical simulations and
seismic observations are used to constrain the amount of compositional
layering that could be present in the deep mantle, finding that a deep
(i.e., ~1000 km thick) layer is ruled out. Secondly, the importance of
the finite strength of rocks on the formation of plate tectonics on
Earth is investigated, finding that its inclusion into 3-D numerical
models leads to a reasonable first order approximation of plate
tectonics behavior. Models that combine plate formation with
geochemical differentiation and evolution are presently being
developed.



　　　　　　　　問い合わせ先：井上　徹 　TEL　　　（089）927-9658
　　　 　　　　　　　　　　　　　　　　E-mail　　inoue@sci.ehime-u.ac.jp