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<div class="" style="word-wrap:break-word; line-break:after-white-space">Dear all,
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<div class="">The first faculty candidate for the Lithospheric Processes (Metamorphic Petrology) search, Dr. Chenguang Sun will be arriving next Monday (27th) afternoon and will be leaving on Wednesday (29th). </div>
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<div class="">I am attaching the title and abstract of his talk. The talk is scheduled at
<b class="">3:30 PM; 28th January 2020</b> (Tuesday)</div>
<div class="">Venue: <b class="">EOA 1044</b>.</div>
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<div class="">I am also attaching his CV+ application materials for your reference. If you would like additional information please feel free to contact me, I will be happy to update. Also if you would like to meet the candidate, please let me know of your
availability and I will try and schedule a meeting.</div>
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<div class="">I hope you are able to attend the presentation.</div>
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<div class=""><span class="">Title:</span><b class=""> Cratonic lithosphere thinning through time: Evidence from kimberlite thermobarometry</b></div>
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<div class="">Abstract: As the keels of continents, cratons are believed to have been stable since their formation at billions of years ago. This conventional view was established from petrological, geochemical, and geophysical studies on cratonic lithosphere.
Yet, evidence for the absence of cratonic roots at some Archean terrains casts doubt on the craton stability. This poses a fundamental question on the destabilization of cratons globally through time, which was often overlooked due to the lack of geological
observations. To address this question, I develop a new liquid thermobarometer for kimberlite and other silica-poor, CO2-rich melts using high-temperature and high-pressure experimental data. As unique mantle-derived melts at ancient continents, kimberlite
magmas are ideal tools to constrain the temporal variation of lithosphere thickness and the processes affecting the lithosphere root. Applying this new thermobarometer to global kimberlite rock records, I will show that the thickness of cratonic lithosphere
has decreased globally by up to ~150 km during the past ~2 Gyr, indicating that the conventional view of stable, long-lived cratons needs to be revised. This has significant consequences on Earth’s dynamic and chemical evolution that demand a series of future
studies. Taking the temporal evolution of kimberlite volcanism and subduction flux into account, I will also discuss the possible mechanism of craton destabilization through time and its implications for Earth’s deep carbon cycle.</div>
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<div class="">Best wishes</div>
<div class="">Mainak</div>
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Mainak Mookherjee<br class="">
Associate Professor<br class="">
Earth, Ocean and Atmospheric Sciences<br class="">
Florida State University<br class="">
Tallahassee, FL, 32310, USA<br class="">
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Phone: (850) 644 1536 (Office)<br class="">
<a href="mailto:mmookherjee@fsu.edu" class="">Email: mmookherjee@fsu.edu</a><br class="">
Email: mainak.mookherjee@gmail.com<br class="">
URL:http://myweb.fsu.edu/mmookherjee<br class="">
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