Wednesday Seminar

today is Thursday, September 21st, 2017

Wednesday, October 4th, 2017, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“Collisional modification of planetary compositions”

      – by Dr. Phil Carter, Earth and Planetary Sciences Department, UC Davis

Models of planet formation help bridge the observational gap between protoplanetary discs and fully formed planetary systems. Our solar system provides key benchmarks for planet formation theories, particularly via detailed compositional information both from the Sun and from meteorites. As observations of exoplanets improve it becomes increasingly important to understand how accretion shapes the compositions of planets. Collisional erosion during the accretion of terrestrial planets has been suggested as an important mechanism for altering planetary compositions, which might explain observed differences between Earth and chondrites. I will present the results of simulations of terrestrial planet formation which include imperfect accretion and track compositional information, and simulations of planetary embryo collisions which trace planetary crusts. I will show that the accretion process during the intermediate growth phase can naturally lead to changes in the bulk compositions of planetary bodies, and discuss measurable consequences of two contrasting planet formation models.

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Wednesday, October 11th, 2017, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“TBA”

      – by Dr. George Bergantz, Earth and Space Sciences Department, University of Washington

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Wednesday, October 18th, 2017, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“TBA”

      – by Dr. Craig Jones, Department of Geological Sciences, CU Boulder

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Wednesday, October 25th, 2017, Wednesday Seminar

4:10 PM, 55 Roessler

“No Seminar - GSA Meeting”

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Wednesday, November 22nd, 2017, Wednesday Seminar

4:10 PM, 55 Roessler

“No Seminar - Thanksgiving Break”

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Wednesday, November 29th, 2017, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“TBA”

      – by Dr. Teresa Steele, Department of Anthropology, UC Davis

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Wednesday, December 6th, 2017, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“TBA”

      – by Dr. Jason Kean, USGS

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Wednesday, January 10th, 2018, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“TBA”

      – by Dr. Devin McPhillips, USGS

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Wednesday, January 17th, 2018, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“TBA”

      – by Dr. Kim Blisniuk, Geology Department, San Jose State University

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Wednesday, January 24th, 2018, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“TBA”

      – by Dr. Kenneth Creager, Earth and Space Sciences Department, University of Washington

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Wednesday, January 31st, 2018, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“Paleocene-Eocene Thermal Maximum meets the North Atlantic Igneous Province: Coincidence or global environmental conspiracy?”

      – by Dr. Andy Ridgwell, Department of Earth Sciences, UC Riverside

The Paleocene-Eocene Thermal Maximum (PETM, ~56 Ma), with its multiple lines of
attendant evidence for massive greenhouse gas release and global-scale warming, is
regarded as a highly plausible future analogue. However, because the onset of the PETM
likely took place at a rate at least one, if not two, orders of magnitude slower than current
century-scale anthropogenic warming, it is uncertain what we can learn e.g. re. biotic
sensitivities, except perhaps to place a lower limit on potential future disruption. Instead,
focus has often been on what the PETM might reveal regarding the sensitivity of surficial,
reduced carbon stores (e.g. vegetation and soil carbon, permafrost, marine hydrates) to
warming, and hence the strength of positive feedbacks between atmospheric CO2 and
climate change. Indeed, almost all explanations to date for the PETM have relied either
solely, or dominantly, on one or more of these carbon sources and feedbacks. Yet one of the
largest igneous provinces (the North Atlantic Igneous Province — ‘NAIP’) recorded in the
geological record was being emplaced exactly at this time and its role to date, almost entirely,
overlooked.
Here I present a revised view of the PETM as one predominantly the product of massive
volcanism, making it rather unexpectedly more like the end Permian in character. Feedbacks
with climate and involving reservoirs of reduced organic carbon likely only play a more minor
role, reducing the event’s future relevance. I come to these conclusions on the basis of new
paired records of boron and carbon isotope changes, assimilating these data in an Earth
system model to reconstruct the unfolding carbon cycle dynamics across the event. Model
results indicate >10,000 PgC with an average isotopically heavier than -17‰ is required to
account for the observations, leading to the identification of volcanism associated with the
NAIP as the main driver of the PETM.

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Wednesday, March 7th, 2018, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“TBA”

      – by Dr. Bradley Hacker, Department of Earth Science, UC Santa Barbara

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Wednesday, May 2nd, 2018, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“TBA”

      – by Dr. Caroline Strömberg, Department of Biology, University of Washington

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Wednesday, May 9th, 2018, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“TBA”

      – by Dr. Susannah Dorfman, COMPRES Distinguished Lecturer, Department of Earth and Environmental Sciences, Michigan State University

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