Mantle processes
Investigating mantle flows at subduction zones and beyond
Investigating mantle outflows along a slab gap in the southern Marianas (Ribeiro et al., 2017, EPSL).
At subduction zones, the sinking of the downgoing lithosphere is thought to enable a return flow of asthenospheric mantle around the slab edges. However, asthenospheric flow may also accommodate volumetric variations of shrinking or growing oceanic plates. Here, we seek to understand whether regional plate kinematics or local slab-mantle interactions determine the mantle flow in or out through slab gaps by integrating geophysical and geochemical approaches.
Further readings
Ribeiro J.M., Stern R.J., Martinez F., Woodhead J., Chen M., Ohara Y. (2017) Asthenospheric outflow from the shrinking Philippine Sea Plate: Evidence from Hf-Nd isotopes of southern Mariana lavas, Earth and Planetary Science Letters.
Woodhead J., Stern R.J., Pearce J., Hergt J., Vervoort J. (2012) Hf-Nd isotope variation in Mariana Trough basalts: The importance of “ambient mantle” in the interpretation of subduction zone magmas, Geology, 40(6), 539-542, doi: 10.1130/G32963.1.
Woodhead J., Stern R.J., Pearce J., Hergt J., Vervoort J. (2012) Hf-Nd isotope variation in Mariana Trough basalts: The importance of “ambient mantle” in the interpretation of subduction zone magmas, Geology, 40(6), 539-542, doi: 10.1130/G32963.1.
