UMD: Hopkins’ Holder on metamorphism and plate tectonics

2019 Geology Colloquium Series

Friday, April 26th 2019 at 3:10 pm
in PLS 1140

Watch live at

Robert Holder
Johns Hopkins University

Metamorphism and the Evolution of Plate Tectonics

At present, Earth’s mantle convection, which facilitates planetary heat loss, is expressed at the surface as plate tectonics. When plate tectonics emerged and how it has evolved through time are two of the most fundamental and provocative questions outstanding in Earth science. Metamorphic rocks, those that have experienced solid-state mineral transformations due to changes in pressure (P) and temperature (T), record periods of burial/exhumation and heating/cooling that reflect the tectonic environments in which they formed. Changes in the global distribution of metamorphic P–T conditions in the continental crust through time reflect secular evolution of Earth’s tectonic processes at convergent plate boundaries. On modern Earth, convergent plate margins are characterized by metamorphic rocks that record a bimodal distribution of apparent thermal gradients (change in temperature with depth, parameterized in this talk as metamorphi! c T/P), in the form of paired metamorphic belts, which is attributed to metamorphism near to (low T/P) and away from (high T/P) subduction zones. In this talk, I will evaluate the emergence of bimodal metamorphism as a proxy for secular change in plate tectonics using a statistical evaluation of the distributions of metamorphic T/P through time. I will argue that Earth’s modern plate tectonic regime developed gradually since the Neoarchaean Era in conjunction with secular cooling of the mantle and associated changes in the thickness, buoyancy and rheology of oceanic lithosphere, resulting in an evolution in the styles of both subduction and collisional orogenesis.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s