Japan Geoscience Union Meeting 2019

Presentation information

[E] Poster

S (Solid Earth Sciences ) » S-GC Geochemistry

[S-GC40] Volatile Cycles in the Deep Earth - from Subduction Zone to Hot Spot

Wed. May 29, 2019 10:45 AM - 12:15 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Hirochika Sumino(Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo), Takeshi Hanyu(Japan Agency for Marine-Earth Science and Technology, Department of Solid Earth Geochemistry), Yuji Sano(Division of Ocean and Earth Systems, Atmosphere and Ocean Research Institute, University of Tokyo), Gray E Bebout(Lehigh University)

[SGC40-P01] Continental growth models demystified

*Jun Korenaga1 (1.Department of Geology and Geophysics, Yale University)

Keywords:Continental crust, Plate tectonics, Chemical differentiation

So far proposed models of continental growth exhibit bewildering diversity, but this diversity is rather superficial. By understanding how different growth models are built and what they are meant to constrain, we can gain deeper insight into the evolution of continental crust as well as the dynamics of the early Earth. There are three kinds of growth models: crust-based, mantle-based, and others. Crust-based models provide only the lower bound on net crustal growth, and mantle-based models aim at constraining net crustal growth itself. Other models are also about net crustal growth, but they are subject to greater uncertainty. In the presence of crustal recycling, crust-based models are expected to be different from mantle-based models, and more important, the difference between these two kinds of models provides important constraints on the operation of plate tectonics in the early Earth. Some popular misconceptions in the recent literature are also discussed.