Graham Pearson and Martha R. Reid got the 2019 Norman L. Bowen Award at AGU’s autumn Meeting 2019, arranged 9–13 December in San Francisco, Calif. The prize acknowledge “outstanding efforts for the grounds of volcanology, geochemistry, and petrology.”
By AGU 19 times ago
Citation for Graham Pearson
Graham Pearson merits the 2019 Norman L. Bowen Award for contributing to our personal basic expertise in igneous processes through the upper mantle through reports of eruptive rocks, exhumed mantle areas, subcontinental mantle examples, and diamonds in addition to their additions. Pearson provides handled the biggest posts in mantle geochemical progression with a research appliance package that extends from petrography, mineralogy, and petrology through steady isotopes, radiogenic isotopes, siderophile components, and spectroscopy. In using these techniques, Pearson possesses found unique diagnostic technique changes that drive the frontiers of logical sensitiveness and detail.
Peers will remember a long list of findings: large items of Earth’s mantle emplaced from the diamonds reliability subject;
eclogite xenoliths in kimberlite as Archean subducted oceanic crust; continental mantle keel age-match with overlying crust; Re-Os sulfide age-dating of unmarried sulfide additions in jewel; kimberlite derivation from distinct mantle sites; the Os isotopic imprint from inside the oceanic mantle of continental crust removal; trace feature abundances in treasure diamonds and provider fingerprinting; a forward thinking subduction analogue for Archean craton development; as well obtaining, in a superdeep diamonds, associated with the primary terrestrial ringwoodite.
With this second accomplishment, we see a typical example of precisely why Graham Pearson is specially worthy of the Bowen Award. They led the effort to effectively gauge the water information found in a smoothly metastable unmarried whole grain 
of ringwoodite while it am encased inside stone therefore it could shun dysfunction and consequently retain every bit of its unique liquids. In one of the most vital nutrient analyses ever produced, Pearson and co-workers managed to showcase immediately your ringwoodite received more or less 1.5 wt % liquid. For the first time, below had been verification your mantle transition zone can be damp.
In attention belonging to the summarize and wide range of his or her benefits, we deservedly honour Graham Pearson the wide interdisciplinary impact of a task in learning the mantle anyway absolute depths.
—Steven B. Shirey, Carnegie Company for Research, Washington, D.C.
Feedback
Thank you, Steve, to suit your really ample and flattering text. Gratitude also to those who nominated me personally for the award. Im instead humbled by the religion in myself. We have just certain things in common with Bowen: my Canadian citizenship and hours put in during the Carnegie Institution of Arizona. We highly recommend both.
Your career is endowed with several lucky functions and fruitful collaborations with a long list of skilled folks also various to say but also vital that you disregard. On getting into school, i needed are a mining geologist—something I nonetheless claim staying whenever checking out diamonds mines—but inspiring undergraduate training by Bob Thompson at Imperial institution diverted our road. Using two amazing Ph.D. supervisors in Pete Nixon and Gareth Davies would be type in driving me to my method through being.
Pete’s infectious desire for the mantle great personal consistency is something you should desire to.
Postdoc teachers on the prominence, quality, and generosity of Steve Shirey, Rick Carlson, Joe Boyd, and Chris Hawkesworth gave me no explanation to do not succeed. After 15 pleased ages at Durham, I became lured to Ontario, exactly where I am fortunate with genuinely encouraging friends just who render working at the University of Alberta an absolute pleasures.
But i wish to stop by being focused on several people who frequently do not get the financing they should have. Without the dedication, inspiration, and assistance for the array of research administrators and tech support team I have been privileged to work alongside through my own job, i’d have actually created minimal. Extremely I’d always accept Geoff Nowell, Chris Ottley, Sarah forest, Yan Lou, and Chiranjeeb Sarkar, just who, having every one simple youngsters and postdocs, and simple heroic spouse, Sam, truly obtain some point about this honor.
—Graham Pearson, College of Alberta, Edmonton, Ontario
Citation for Mary R. Reid
Linda Reid gets the Bowen honor on her behalf inventive and ground breaking implementing zircon geochronology for knowledge effective silicic magma devices. Her 1997 document in ground and Planetary technology Letters, “Prolonged household periods for the youngest rhyolites with Long Valley caldera: 230 Th– 238 U ion microprobe going out with of youthful zircons,” started a area of inquiry into magmatic procedures, providing the logical and mental system for performing and interpreting the geochronology of young zircon by alternate ion weight spectrometry. The initial and innovative ideas associated with the document repositioned all of our knowledge of the rates and operations involved in magma storage space, boost, and emergence.
Linda made use of U–Th disequilibrium online dating showing that zircons covered within the products of just one emergence
posses ages that span 10s to many kiloyears, meaning a complex and protracted preeruption past of subvolcanic magmatic advancement. Happened to be the zircons tracking the residency age of melt-rich and potentially eruptible magma (their favorite explanation back then), or happened to be zircons are reprocessed from largely solidified parts of a lot larger magma reservoir? These queries therefore sparked work with the acting area to research the situations required to manage melt-rich, silicic magma over these timescales and synchronous work in order to comprehend the systems and timescales of silicic melt segregation from crystal mush. Mary’s services subsequent to the 1997 documents, both by herself is actually the woman students, on extended pit, Yellowstone, plus the Youngest Toba Tuff, portray together a tour de power of observations into operation of large, hazardous silicic magma software. These forms, together with the lots of papers by additional analysts making use of the tips, get expose subvolcanic magma methods to become active, long-lived, and complex conditions. Linda Reid’s maintain silicic magma techniques has had an enduring affect the volcanology, geochemistry, and petrology areas. She’s worth the Bowen honor in all aspects.
—Jonathan Miller, San Jose Say School, San Jose, Calif.
