Events
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JSG | BEG | UTIG | EPS |
Soft Rock Seminar: Amanda Peralta
Start:November 2, 2015 at 12:00 pm
End:
November 2, 2015 at 1:00 pm
Location:
JGB 3.222
Alumni Reception during GSA in Baltimore
Start:November 2, 2015 at 6:00 pm
End:
November 2, 2015 at 8:00 pm
Location:
Pratt Street Ale House, 206 W. Pratt St., Baltimore, MD
Contact:
Kristen Tucek, ktucek@jsg.utexas.edu, 512-471-2223
De Ford Lecture Series: Nicolas Dauphas, University of Chicago
Start:November 5, 2015 at 3:30 pm
End:
November 5, 2015 at 5:00 pm
Location:
Boyd Auditorium
Contact:
Patrick Stafford, 5124715172
UTIG Seminar Series: Nick Dygert, JSG
Start:November 6, 2015 at 10:30 am
End:
November 6, 2015 at 11:30 am
Location:
PRC, 10100 Burnet Road, Bldg 196, Rm 1.603, Austin, TX 78758
Contact:
Nick Hayman, hayman@ig.utexas.edu, 512-471-7721
View Event
“Kinetic Fractionation of Noble Gases beneath Mid-Ocean Ridges: New Insights into Mantle Mixing and Heterogeneity”
Abstract:
Recent measurements have highlighted that the MORB mantle source has distinctly higher 3He/22Ne compared to primitive mantle (~10 vs. 2, respectively) [1]. We seek to understand the source of this difference by modeling chemical exchange between dunite-channel hosted basaltic liquids and harzburgitic wallrock during the percolation of melts to the surface.
Dunite channels are thought to represent pathways for efficient melt extraction from the upper mantle. Percolation of basaltic melts through dunite channels allows them to retain high-pressure multiple saturation depths and the trace element characteristics of their mantle source. However, diffusive interaction of basaltic melts with harzburgite wallrock has an inevitable effect on the chemistry of the lithospheric mantle. In terms of global geochemical cycles, this effect is inconsequential for slow diffusing elements but can be significant for fast diffusiving, incompatible elements. Helium and neon are highly incompatible during mantle melting [2,3] and He is extremely mobile [e.g., 4]. Measurements of He diffusion in olivine suggest it is orders of magnitude faster than Ne at mantle relevant temperatures. Fast diffusion of He out of dunite channel-hosted basaltic melts and into volatile element depleted harzburgitic wallrock can efficiently fractionate He from Ne. These fractionations can then be imparted onto the depleted mantle by subduction or delamination of lithospheric mantle.
Melt percolation-diffusive interaction calculations suggest that preferential 3He ingassing at dunite channels will significantly increase 3He/22Ne of the depleted mantle. Ingassing of peridotite by dunite-hosted basaltic melts has presumably occurred for most of geologic time. This simple model represents an alternative to the multiple degassed magma oceans invoked by [1] to increase the 3He/22Ne of the depleted mantle. If kinetic fractionation is the dominant physical process modulating the 3He/22Ne of the mantle, timescales of mantle mixing on the order of billions of years may be required. Despite seismic tomographic evidence for whole mantle convection, the persistence of low 3He/22Ne reservoirs to the present day requires convective isolation of mantle heterogeneities throughout geologic time.
[1] Tucker & Mukhopadhyay (2014) EPSL 393, 254-265. [2] Heber et al (2007) GCA 71, 1041-1061. [3] Jackson et al (2013) EPSL 384, 178-187. [4] Cherniak & Watson (2012) GCA 84, 269-279.
Grad School Application Q & A
Start:November 6, 2015 at 12:00 pm
End:
November 6, 2015 at 1:00 pm
Location:
JGB 2.112 Career Center
Contact:
Maurine Riess, mriess@jsg.utexas.edu, 512-232-7673
Are you applying for graduate school this semester (for Fall 2016 enrollment)? Would you like to discuss the challenges and process with other students and get advice on how to write those statements or your CV?
No need to RSVP, just come on into the Career Center for answers to your questions or discuss with your peers and Career Center staff. We are here to help!
Soft Rock Seminar: Dan Dylward
Start:November 9, 2015 at 12:00 pm
End:
November 9, 2015 at 1:00 pm
Location:
JGB 3.222
Scholar’s Luncheon
Start:November 12, 2015 at 12:00 pm
End:
November 12, 2015 at 2:00 pm
Location:
UT Austin Campus
Contact:
Georgia Sanders, gsanders@jsg.utexas.edu, 512-471-1282
Geology Foundation Advisory Council Meeting
Start:November 12, 2015 at 12:00 pm
End:
November 13, 2015 at 5:00 pm
Location:
UT Austin Campus
Contact:
Georgia Sanders, gsanders@jsg.utexas.edu, 512-471-1282
De Ford Lecture Series: Jean Hsieh, Talisman Energy
Start:November 12, 2015 at 3:30 pm
End:
November 12, 2015 at 5:00 pm
Location:
Boyd Auditorium
Contact:
Patrick Stafford, 5124715172
UTIG Seminar Series: Jolante van Wijk, New Mexico Tech
Start:November 13, 2015 at 10:30 am
End:
November 13, 2015 at 11:30 am
Location:
PRC, 10100 Burnet Road, Bldg 196, Rm 1.603, Austin, TX 78758
Contact:
Harm Van Avendonk, harm@ig.utexas.edu, 512-471-0429
View Event
“Initiation, Crustal Architecture, and Extinction of Pull-Apart Basins”
Abstract:
I present a new model for the origin, crustal architecture, and evolution of pull-apart basins. The model is based on results of three-dimensional upper crustal numerical models of deformation, field observations, and fault theory, and it predicts pull-apart rift architecture and temporal evolution that can be tested with field- and geophysical data in future studies. The model is generally applicable to basin-scale features, but predicts some intra-basin structural features. Geometric differences between pull-apart basins are inherited from the initial geometry of the strike-slip fault step, which may, in turn, result from the forming phase of the strike-slip fault system. As strike-slip motion accumulates, pull-apart basins are stationary with respect to underlying basement, and the fault tips propagate beyond the rift basin. Because uplift is concentrated near the fault tips, the sediment source areas rejuvenate and migrate over time. Pull-apart rift lengthening is accommodated by extension within the pull-apart basin as in narrow continental rifts. Field studies predict that pull-apart basins become extinct when an active basin-crossing fault forms; this is the most likely fate of pull-apart basins, because the strike-slip system tends to straighten. The model predicts what the favorable step-dimensions are for the formation of such a fault system, and when a pull-apart basin may further develop into a short seafloor-spreading ridge. The model further predicts that rift shoulder uplift is enhanced if the strike-slip rate is larger than the fault-propagation rate. Crustal compression then contributes to uplift of the rift flank.
Geology Foundation Advisory Council Meeting
Start:November 12, 2015 at 12:00 pm
End:
November 13, 2015 at 5:00 pm
Location:
UT Austin Campus
Contact:
Georgia Sanders, gsanders@jsg.utexas.edu, 512-471-1282
Soft Rock Seminar: Jean Hsieh
Start:November 13, 2015 at 12:00 pm
End:
November 13, 2015 at 1:00 pm
Location:
JGB 3.222
Academic Career Start-Faculty Panel
Start:November 13, 2015 at 1:00 pm
End:
November 13, 2015 at 2:00 pm
Location:
JGB 2.112 A Career Services Conference Room
Contact:
Maurine Riess, mriess@jsg.utexas.edu, 512-232-7673
Q&A with distinguished faculty to help PhD students in their quest for an academic career.
This pane: Steve Laubach, Julia Clarke, Wonsuck Kim
No RSVP required
Soft Rock Seminar: Luca Trevisan
Start:November 16, 2015 at 12:00 pm
End:
November 16, 2015 at 1:00 pm
Location:
JGB 3.222
De Ford Lecture Series: Mike Hudec, BEG
Start:November 19, 2015 at 3:30 pm
End:
November 19, 2015 at 5:00 pm
Location:
Boyd Auditorium
Contact:
Patrick Stafford, 5124715172
UTIG Seminar Series: Samer Naif, Scripps Institution of Oceanography
Start:November 20, 2015 at 10:30 am
End:
November 20, 2015 at 11:30 am
Location:
PRC, 10100 Burnet Road, Bldg 196, Rm 1.603, Austin, TX 78758
Contact:
Laura Wallace, lwallace@ig.utexas.edu, 512-471-0324
View Event
“Electromagnetic Imaging of Water-Rich Faults and Melt-Rich Asthenosphere at the Middle America Trench”
Abstract:
Quantifying the flux of water transported by oceanic plates and the distribution of fluids released during subduction is critical to understanding the pattern of seismic coupling at the plate interface and the cycling of water between the solid and fluid Earth. Electromagnetic (EM) methods are ideally suited to map porosity and fluid pathways to help elucidate the hydrogeology of subduction zones. In 2010, Scripps performed the Serpentinite, Extension, and Regional Porosity Experiment across the Nicaragua Trench (SERPENT). We deployed 50 ocean-bottom EM receivers along a 280 km profile that spanned the abyssal plain, trench-outer rise, and forearc slope at the Middle America Trench. In this presentation, I will discuss results from 2-D inversion of both the passive magnetotelluric (MT) and controlled-source EM (CSEM) data.
The MT data led to the surprising discovery of a thin high conductivity channel seaward of the trench at 45-70 km depths. Its resistivity signature requires enough water to induce melting and leads us to conclude the origin of the anomaly to be partial melt.
The CSEM data reveal fluid-rich pathways along bending faults in the incoming crust, the complete subduction of the incoming sediments that define the plate interface, and the migration of fluids from the plate interface to the overlying plate. We infer porosity from resistivity to show that: 1) the incoming crust subducts 60% more pore water than previous estimates, and 2) the subducted sediment porosity decays exponentially, in good agreement with existing compaction studies.
Academic Career Start-Faculty Panel at PRC
Start:November 23, 2015 at 11:00 am
End:
November 23, 2015 at 12:01 pm
Location:
ROC 2.201 Conference Room
Contact:
Maurine Riess, mriess@jsg.utexas.edu, 512-232-7673
Q&A with distinguished faculty to help PhD students in their quest for an academic career.
This pane: Sergey Fomel, Peter Eichhubl, Bayani Cardenas
Refreshments will be provided by the JSG Career Center
No RSVP required
Soft Rock Seminar: Renas I. Koshnaw
Start:November 23, 2015 at 12:00 pm
End:
November 23, 2015 at 1:00 pm
Location:
JGB 3.222
Career Center Open House
Start:November 30, 2015 at 9:00 am
End:
November 30, 2015 at 12:00 pm
Location:
JGB 2.112 Career Center
Last one of the semester! Free bagels & coffee
Soft Rock Seminar: Breecker Group
Start:November 30, 2015 at 12:00 pm
End:
November 30, 2015 at 1:00 pm
Location:
JGB 3.222
UTIG Seminar Series: Melisa Diaz, The Ohio State UniversityMarch, 29 2024Time: 10:30 AM - 11:30 AMLocation: PRC 196/ROC 1.603 Speaker: Melisa Diaz, Assistant Professor, The Ohio State University Host: Benjamin Keisling Title: Biogeochemistry of a Greenland Ice-Marginal Lake Abstract: Due to polar amplification, nearly every glacier in Greenland has thinned and/or retreated in recent decades. The meltwater generated from these glaciers can take several paths, ultimately discharging into coastal waters or stored in closed-basin lakes. Ice-marginal lakes are a common but poorly understood feature in many glaciated regions, including Greenland. The lakes receive freshwater input from a combination of subglacial, supraglacial, terrestrial and meteoric sources, and a subset periodically drain, resulting in the rapid discharge of large volumes of water downstream (glacial lake outburst floods – GLOFs). In the case of drainages under adjacent marine terminating glaciers, GLOFs can deposit large amounts of sediment, nutrients, and freshwater directly into coastal waters and fjords. Lake Tininnilik, a large (~40 km2) ice-marginal lake that forms along Saqqarliup Glacier in west Greenland, drains ~2 km3 on quasi-cyclic decadal timescales into Saqqarleq Fjord to the north. For this talk, I will discuss the first comprehensive biogeochemical analysis of Lake Tininnilik and its potential influence on coastal primary productivity, including its major and minor nutrient stoichiometry and microbial composition. As the climate continues to warm, GLOFs are expected to become more frequent in Greenland. Therefore, it is imperative that we understand how these events can impact coastal community resilience. |
UTIG Discussion Hour: Kaitlin Schaible (UTIG)April, 02 2024Time: 2:00 PM - 3:00 PMLocation: ROC 2.201 |
UTIG Seminar Series: Chuanming Liu, UT AustinApril, 05 2024Time: 10:30 AM - 11:30 AMLocation: PRC 196/ROC 1.603 Speaker: Chuanming Liu, Distinguished Postdoctoral Fellow, UT Jackson School of Geosciences, Postdoctoral Fellow, University of Texas Institute for Geophysics Host: Thorsten Becker |
UTIG Discussion Hour: Soraya Alfred (UTIG)April, 09 2024Time: 2:00 PM - 3:00 PMLocation: ROC 2.201 |
UTIG Seminar Series: Tanner Miller, UTIGApril, 12 2024Time: 10:30 AM - 11:30 AMLocation: PRC 196/ROC 1.603 Speaker: Tanner Miller, Postdoctoral Fellow, University of Texas Institute for Geophysics Host: Peter Flemings |
UTIG Seminar Series: Crispin Little, University of LeedsApril, 12 2024Time: 2:00 PM - 3:00 PMLocation: PRC 196/ROC 1.603 Join us for a special seminar with Professor Cris Little. Speaker: Crispin Little, Professor, School of Earth and Environment, University of Leeds Host: Rowan Martindale Title: Biotic response to environmental perturbations in the Pliensbachian and Toarcian stages of the Lower Jurassic Abstract: The Lower Jurassic period was characterized by instability in global climate, with alternating greenhouse and icehouse states, and episodes of widespread oxygen depletion in the shallow marine environment. These episodes of oxygen depletion are marked by frequent intervals of increased organic carbon preservation in shallow marine sediments. The Pliensbachian stage of the Lower Jurassic was characterised by significantly cooler global temperatures than the preceding Sinemurian, and the following Toarcian stages, and ended with an extinction event (notably for ammonites) at the Pliensbachian-Toarcian boundary (Pl-To) ca. 184.2 Ma. About one Myr later the Toarcian Oceanic Anoxic Event (T-OAE) is characterized Corg rich black shale successions, particularly well developed in sedimentary basins in NW Europe, which display a negative ?13Corg excursion of -5 to -6‰, lasting 0.5 to 1.5 Myr. This excursion has been tied to a disruption of the global exogenic carbon cycle, but the ultimate source of the injected 12C is a matter of debate, with suggestions including methane hydrates, thermogenic methane produced by volcanism in the Karoo-Ferrar Large Igneous Province (LIP), wetlands, and permafrost destabilisation. The onset of the T-OAE in many (but importantly not all) sections is intimately linked to an extinction event that especially impacted the marine benthic macrofauna, but left the nekton largely unaffected. The recovery from this event is not well studied, but in one site, the Cleveland Basin of North Yorkshire, UK, although species richness recovered markedly as soon as environmental conditions ameliorated, other metrics of functional diversity and community structure did not attain pre-extinction levels until much later, some five million years after the extinction event. The talk will be of interest to those working on macroevolution, paleontology, and the effect of large scale climate change on marine ecosystems. |
UTIG Discussion Hour: Medha Prakash (UTIG)April, 16 2024Time: 2:00 PM - 3:00 PMLocation: ROC 2.201 |
UTIG Seminar Series: Emma \"Mickey\" MacKie, University of FloridaApril, 19 2024Time: 10:30 AM - 11:30 AMLocation: PRC 196/ROC 1.603 Speaker: Emma \"Mickey\" MacKie, Assistant Professor, Geological Sciences, University of Florida Host: John Goff |
Master\'s Thesis PresentationsApril, 19 2024Time: 2:00 PM - 5:00 PMLocation: JGB The Master of Science (MS) degree at the Jackson School of Geosciences is considered to be the professional degree for a career in the Geosciences. This degree is the foundation for students pursuing employment in the petroleum industry, environmental and hydrogeological fields, state and federal government agencies, and other related geoscience fields. Some students also use the MS degree as preparation for pursuing a Ph.D. The Energy & Earth Resources Interdisciplinary program provides the opportunity for students to prepare themselves in management, finance, economics, law and policy leading to analytical and leadership positions in resource-related fields. The private sector and government organizations face a growing need for professionals that can plan, evaluate, and manage complex resource projects, commonly international in scope, which often include partners with a variety of professional backgrounds. As requirements for these degrees, students must present a professional talk on Master\'s Thesis Presentations. |
Planetary Habitability Seminar SeriesApril, 22 2024Time: 1:00 PM - 2:00 PMLocation: PMA 15.216B UT Center for Planetary Systems Habitability Seminar Series. See website for speaker schedule and more details: View Events Join remotely: https://utexas.zoom.us/j/94052130734 In person: Classroom 15.216B, Physics, Math and Astronomy Bldg. UT Austin, Department of Astronomy 2515 Speedway, Stop C1400 Austin, Texas 78712-1205 |
UTIG Discussion Hour: Nicholas Montiel - PhD Talk (UTIG)April, 23 2024Time: 2:00 PM - 3:00 PMLocation: ROC 2.201 |
UTIG Seminar Series: Cornelia Rasmussen, UTIGApril, 26 2024Time: 10:30 AM - 11:30 AMLocation: PRC 196/ROC 1.603 Speaker: Cornelia Rasmussen, Research Associate, University of Texas Institute for Geophysics Host: Krista Soderlund |
Planetary Habitability Seminar SeriesApril, 29 2024Time: 1:00 PM - 2:00 PMLocation: PMA 15.216B UT Center for Planetary Systems Habitability Seminar Series. See website for speaker schedule and more details: View Events Join remotely: https://utexas.zoom.us/j/94052130734 In person: Classroom 15.216B, Physics, Math and Astronomy Bldg. UT Austin, Department of Astronomy 2515 Speedway, Stop C1400 Austin, Texas 78712-1205 |