EGU2020-5997
https://doi.org/10.5194/egusphere-egu2020-5997
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Continental Crust formation in the Archean vs modern times

Oliver Jagoutz1, Benjamin Klein1, Max W Schmidt2, and Nico Küter2
Oliver Jagoutz et al.
  • 1MIT, EAPS, United States of America (jagoutz@mit.edu)
  • 2ETH Zurich, Switzerland

When subduction initiated and contributed to formation of Continental crust is uncertain. A crucial difference between subduction zones magma and e.g. plume related magmatism is the role of H2O in the magma formed. Subduction zones magma are frequently wet and follow a liquid line of descent (LLD) that differs from dry plume related magmas. We developed a qualitative hygrometer based on major elements that allow to distinguish between LLD formed at water saturated condition from those that formed at dry conditions. While arc magmas can by dry at times, plume related magmas are generally dry. So wet LLD are a hall mark of subduction. In this talk we will compare the modern arc record with the Archean rock record to investigate if Archean rocks formed due to a wet or dry LLD. 

How to cite: Jagoutz, O., Klein, B., Schmidt, M. W., and Küter, N.: Continental Crust formation in the Archean vs modern times, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-5997, https://doi.org/10.5194/egusphere-egu2020-5997, 2020