Lehrstuhl für Endogene Geodynamik (Prof. Dr. Haase)
+49 9131 8569601
Mantle dynamics, magma and crust formation in an oceanic island arc – back-arc system: a case study from the Tonga-Kermadec arc and Valu Fa Ridge
Many oceanic subduction zones consist of island arc volcanoes and a back-arc spreading axis and the magmas in the two settings yield important insight into mantle dynamics and crust formation processes. Previous studies focused on the dynamics of the mantle flow between back-arc and the island arc. However, flow of the mantle occurs as well along the arc and back-arc, which can be studied uniquely in the Tonga-Kermadec arc and Valu Fa Ridge.
We want to examine selected representative lavas from the Tonga-Kermadec island arc and structures in their vicinity to define melting and mixing processes in the mantle wedge, assimilation and fractional crystallization processes in the crust, and the timing of magmatic processes in subduction systems. In terms of these issues samples from earlier research cruises and field trips, as well as new samples from the latest cruises will be analyzed.
- Trace elements: (LA-) ICP-MS
- Pb-Hf Isotopes: MC-ICP-MS
- Sr-Nd Isotopes: TIMS