ExTerra at Goldschmidt 2013 Workshop

  University of Florence, Italy
2013 Goldschmidt Conference
August 24-25, 2013, 8:00 am – 12:00 pm

Conveners: Maureen Feineman, Sarah Penniston-Dorland

AnnouncementAgenda/Presentation archiveRead the report

The goal of ExTerra 2013: Understanding Subduction through Studies of Exhumed Terranes is to organize disparate studies of subduction-related metamorphic and igneous rocks around a common set of scientific targets, and using centralized tools, in order to move the discipline forward more efficiently as a community. In order to accomplish this goal, we will gather the communities of researchers investigating three categories of exhumed rocks from subduction zones:

1) high-pressure rocks of the subducted slab,
2) middle and lower arc crust, and
3) the mantle wedge.

The ExTerra 2013 workshop will be held starting in the morning of Saturday, August 24, lasting through the middle of Sunday, August 25, during the two days prior to the 2013 Goldschmidt Conference in Florence, Italy. It will be held in classrooms on the campus of the University of Florence. The program will include scientific presentations (talks and posters) on current research in exhumed terranes, an update on database and archiving progress, and will identify localities and organizers for field forums to be held over the next few years.

Day one

Welcome and introduction to the workshop
The subducted slab
Keynotes + Discussion
– “The growth of garnet and the chronology of slab dehydration”| icon-file  2Mb – Ethan Baxter
– “The importance of hybrid rocks for transient trace-element and volatile storage at the slab-mantle interface” |  39Mb – Horst Marschall
– “Into the subduction plate interface?” | icon-file 8MbPhilippe Agard
1-minute briefs on posters

Lunch with focus area groups (slab, mantle, and arc crust)

The mantle wedge
Keynotes + Discussion
– ” Field observations and thoughts about carbon transfer from metasediments into the mantle wedge in oceanic subduction zone” | Peter Kelemen
– “Geochemical signature of a serpentinized mantle wedge” |  5Mb – Jaime Barnes
–  “Seismic signatures of a hydrated mantle wedge from antigorite crystal preferred orientation (CPO)” |  2Mb – Sarah Brownlee
– “Mantle wedge oxygen fugacity” | icon-file  3Mb – Katie Kelley
1-minute briefs on posters
The arc crust
Keynotes + Discussion
– “Hot lower arc crust at the surface – A review of some of the most important exhumed crystal sections and xenolith localities from the Americas” |  7Mb – Mihai Ducea
– “Magmatic connections: The interplay of magmatic systems with their crustal containers” |  5Mb – Josef Dufek
– “The formation of continental crust in arcs: The seismological perspective” |  5Mb – Oliver Jagoutz

1-minute briefs on posters

Late afternoon/early evening
Poster session

Dinner meetings with focus area groups (slab, mantle, and crust)

Day two

Welcome and discussion of the future ExTerra
Sample and data management
Field trip proposals
Breakout sessions by topic

Breakout groups report back to full group



General discussion and wrap-up

ExTerra: Understanding Subduction Through Studies of Exhumed Terranes (Florence, Italy, August 24-25, 2013)

“ExTerra: Understanding Convergent Margin Processes Through Studies of Exhumed Terranes”. Maureen Feineman & Sarah Penniston-Dorland, GeoPRISMS Newsletter, Issue 31, Fall 2013.

On August 24-25, 2013, geoscientists met in Florence, Italy for the ExTerra 2013 workshop prior to the Goldschmidt conference. In all, there were 33 participants from 9 countries, including 11 students, 2 post-docs, and 5 early-career faculty. Workshop participants divided into three groups based on different types of exhumed terranes: subducted slab, mantle wedge, and arc crust. The groups were tasked with refining the key scientific questions previously identified in the ExTerra White Paper (2012) and discussing future directions for ExTerra.