Hot water: The impact of fluid flow on crustal radioactivity

Head into the field to analyse natural radioactivity of fluid-altered crust.

Large Crustal Shear Zone

A large crustal shear zone (source, Wikipedia).

Crustal radioactivity affects crustal temperatures and thus has a potential influence on a wide range of crustal and lithospheric processes including melting, magmatism, and strength.  High crustal radioactivity may also be indicators of possible mineralisation.

Models of crustal radioactivity imply that it decreases with depth, more so than one would expect from a changing bulk composition, but why?  Possible explanations include fractionation and crystallisation processes, assimilation of enriched crustal material during ascent, and fluid redistribution.

Your task will be to explore the potential for fluid redistribution.  Fluids, depending upon their composition, have the potential to mobilize heat producing elements (K, Th, and U) and redistribute them to different locations or stratigraphic depths.

In this project, you will study the magnitude of the redistribution on a couple of major crustal shear zones in Australia by collecting in-situ radioactivity and major element chemistry profiles across these shear zones.  Your models will improve regional and global modelling of heat production distribution and temperature models of the crust and lithosphere. 


Supervisors

Tagged in Honours projects - Geology, Honours Projects - Derrick Hasterok, Honours Projects - Martin Hand, Honours projects - Geophysics