Information - VGP22/TS14 Slow to ultraslow spreading ocean ridges and magma-poor continental margins (co-organized by TS & VGP)
Event Information
At least since the Permian, continental breakup has largely been a slow- to ultraslow spreading process. In fact, all the currently active ultraslow and slow spreading mid-ocean ridges formed as a result of the breakup of the supercontinent Pangea. Such ridges often expose ultramafic rocks and are thus termed “amagmatic“ or “magma-starved“. At the same time, ultramafic rocks are increasingly recognized to form the basement of magma-poor rifted margins. Amagmatic rifting thus has played an enormous role in Earth History.
We welcome geophysical, geochemical, observational and numerical approaches that highlight similarities and differences between magma-poor passive margins and (ultra-) slow spreading ridges. Key issues to be addressed are: (1) What is the evidence for magma-poor or magma-starved rifting in the geologic record, and what is the evidence for it today? (2) What do melts and residues from magma-starved rifts tell us about magma generation on magmatically robust rifts? (3) Can we compare modern day ocean ridge processes with those active at continental rifts? (4) What is the role of pre-existing continental structures in determining plate geometries that may lead to amagmatic spreading? (5) How much bare mantle rock has been exposed on the present-day seafloor by this process, and how is it distributed worldwide?
Preliminary List of Solicited Speakers
Co-Sponsorship
InterRidge
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