Events

"Light Stable Isotopic Compositions of Enriched Mantle Sources: Resolving the Dehydration Paradox"

Jackie Dixon

April 7, 2016
Merle Tuve Lecture
Jacqueline E. Dixon

Jacqueline E. Dixon, professor of geological oceanography at the University of South Florida and DTM Merle A. Tuve Fellow, will give her Merle Tuve Lecture titled, "Light Stable Isotopic Compositions of Enriched Mantle Sources: Resolving the Dehydration Paradox", at 11 a.m. on Thursday, 7 April 2016, in the Greenewalt Lecture Hall.

Dixon received her Ph.D. in geochemistry from California Institute of Technology in 1992. Her research interests focus on the role of H2O and CO2 in the generation and evolution of basaltic magmas with an emphasis on submarine volcanoes.

Abstract: One of the remaining puzzles in mantle geochemistry is the origin and evolution of volatile components. In particular, the “dehydration paradox” refers to the following conundrum. The enriched “prevalent mantle” (PREMA) component found in many mantle plumes requires involvement of a mostly dehydrated slab component to explain the trace element ratios and radiogenic isotopic compositions of PREMA-type oceanic basalts, but a fully hydrated slab component to explain the stable isotopic compositions. I will present new volatile concentration and hydrogen, lithium, and boron isotopic compositions for PREMA- and EM-type oceanic basaltic glasses bearing on this issue. I use these and other published data to develop a comprehensive model for the volatile element, trace element and isotopic compositions of most basaltic melts that resolves the dehydration paradox. This model also accounts for the thermal parameters of slabs in controlling compositions of subduction-derived components in mantle reservoirs.

Coffee, tea, and a continental breakfast will be served before the lecture at 10:30 a.m.

"Proposal Preparation: Insights"

Sonia Esperanca

April 1, 2016
Postdoctoral Development Workshop
Sonia Esperança

Former DTM postdoctoral fellow (1985-1987) Sonia Esperança, now National Science Foundation (NSF) Program Director, Petrology and Geochemistry, Division of Earth Sciences - GEO Directorate, and recent recipient of AGU’s 2015 Edward A. Flinn III Award, will be presenting a postdoctoral development workshop* titled, "Proposal Preparation: Insights", at 2:30 p.m. on Friday, 1 April 2016. This workshop will focus on best practices when it comes to the writing and submission of winning proposals.

Esperança received her Ph.D. in geology from Arizona State University in 1985. Prior joining NSF in 1999, she held research and teaching positions in geology and geochemistry at Old Dominion University in Virginia, at the School of Aquatic Sciences and Environmental Management, Deakin University in Victoria, Australia, in the Department of Earth Sciences, Monash University in Victoria Australia, and at the Department of Geology, University of Maryland.

Coffee, tea, and light snacks will be served before the workshop at 2 p.m.

*This workshop is closed to Carnegie personnel only.

"Exoplanet Genetics: What Host Star Chemical Abundances Reveal about Exoplanets"

Johanna Teske

March 31, 2016
DTM Weekly Seminar Series
Johanna Teske

Johanna Teske, an Origins fellow at DTM, will give a talk titled, "Exoplanet Genetics: What Host Star Chemical Abundances Reveal about Exoplanets", at 11 a.m. on Thursday, 31 March 2016, in the Greenewalt Lecture Hall. 

Teske received her Ph.D. in astronomy from the University of Arizona in 2014. Her research focuses on measuring the abundances of different elements in exoplanet host stars in order to learn about the starting chemical conditions for planet formation. She uses high resolution optical spectrometers mounted on big telescopes in Hawaii and Chile to collect her data; observing and tinkering with these instruments is her favorite part of her job. 

Coffee, tea, and a continental breakfast will be served before the lecture at 10:30 a.m.

"Early terrestrial crust formation: petrogenesis of the oldest rocks within the Acasta Gneiss Complex"

Jesse Reimink

March 17, 2016
DTM Weekly Seminar Series
Jesse Reimink

Jesse Reimink, a postdoctoral associate at DTM, will give a talk titled, "Early terrestrial crust formation: petrogenesis of the oldest rocks within the Acasta Gneiss Complex", at 11 a.m. on Thursday, 17 March 2016, in the Greenewalt Lecture Hall as part of DTM's Weekly Seminar Series.

Reimink received his Ph.D. from the University of Alberta in 2015. His research interests include the evolution of crust formation through time; Hadean geodynamics; mode and effect of cratonization; influence of crustal composition on other Earth systems; modeling of complex datasets; high precision geochronology of complex samples. 

Coffee, tea, and continental breakfast will be served before the lecture at 10:30 a.m.

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