Please mark the date for the following super interesting Seminar hosted by GFZ's Section 3.6: Chemistry and Physics of Earth Materials:
Dr. Steven Shirey
Earth and Planets Laboratory, Carnegie Institution of Washington
will give a talk on
„Superdeep diamonds: Sampling plate tectonics at 400 to 700 km depths in Earth's mantle?"
Diamonds are the premier container for mineral inclusions, effectively isolating them completely from reactions with fluids and magmas. A special class of diamond, estimated to comprise less than 10% of diamonds mined from kimberlite, derives from hundreds of kilometers below the lithospheric mantle. These so-called "superdeep" or sublithospheric diamonds carry distinctive retrograded mineral assemblages that give a valuable look at deep mantle mineralogy not attainable any other way. Recent studies of microscopic mineral inclusions extracted from diamond hosts and pressure/temperature modeling of subducted slabs provide new support for these findings: 1) the recycling of surface-derived constituents to the top of the lower mantle, 2) a measurably high water content for nominally anhydrous high-pressure minerals, and 3) evidence for fluid release in the mantle transition zone that may be a cause of deep focus earthquakes.
September 16, 2021
All interested people are invited!
Join the meeting at:
Meeting ID: 932 4922 5944
See you all there
Sergey S. Lobanov