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Online-Seminar - Superdeep diamonds: Sampling plate tectonics at 400 to 700 km depths in Earth's mantle?

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Date: Thursday, 16th September 2021 at 2pm

Speaker:Dr. Steven Shirey, Earth and Planets Laboratory, Carnegie Institution of Washington

Venue: Online via zoom

Host: Sergey S. Lobanov, Section 3.6 Chemistry and Physics of Earth Materials, GFZ

 

 


Dear All,

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

‚ÄěSuperdeep diamonds: Sampling plate tectonics at 400 to 700 km depths in Earth's mantle?"

Abstract:

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

14:00

via ZOOM

All interested people are invited!

 

Join the meeting at:

https://gfz-potsdam-de.zoom.us/j/93249225944?pwd=eDVCelFFUG0reHRJV05SekptTjM3Zz09

Meeting ID: 932 4922 5944
Passcode: 368074

 

See you all there

Sergey S. Lobanov

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