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JSG | BEG | UTIG | EPS |
Tech Sessions: Tim Dixon
Start:August 27, 2013 at 4:00 pm
End:
August 27, 2013
Location:
Boyd Auditorium
Tech Sessions: Kyle Spikes
Start:August 29, 2013 at 4:00 pm
End:
August 29, 2013
Location:
Boyd Auditorium
UTIG Seminar Series: Suzon Jammes, UTIG
Start:August 30, 2013 at 10:30 am
End:
August 30, 2013 at 11:30 am
Location:
10100 Burnet Road, Bldg 196, Rm 1.603, Austin, TX 78758
Contact:
Nick Hayman, hayman@ig.utexas.edu, 512-471-7721
View Event
“Structural Styles of Mountain Building Controls of Rheological and Rift Inheritances”
Abstract:
The deep crustal structure of many orogens is now accessible owing to deep seismic reflection profiles combined with other geophysical methods. The diversity of observed orogenic crustal structures suggests that deformation processes that account for the formation of mountain belts differ from region to region and might also differ along strike of a single system. A range of parameters, including surface process efficiency and lithospheric scale inheritance, may provide a control on the structural style of mountain building. The relative importance of these controls is, however, still unclear. Numerous studies show that the relative strength of the frictional-plastic and viscous rheologies in the crust and mantle lithosphere provides a first order control on the deformation processes in extensional and contractional setting. Since, the strength of the crust and the mantle is strongly influenced by the temperature, the thickness and the composition of the crust and mantle lithosphere, and by inherited weaknesses, it strongly depends on the geodynamic setting. It is consequently expected to be different from one orogen to another and might explain the diversity of deformation styles. An idea that needs to be further investigated.
We use 2D thermo-mechanical models at lithospheric scale to study the effect of the strength of the upper/middle crust on the geometry of contractional systems. Moreover, if many orogens result from the inversion of rifting basins little is known about the effect of rift inheritance during inversion tectonics. The formation of rift basin or passive margin is consequently explicitly modeled and the results are then used as initial condition for lithospheric scale inversion, a procedure, which we call accordion tectonics. Model results are compared to the Zagros, the Alps and the Pyrenees for which the crustal structure is well constrained by geophysical data.
If this work demonstrates the first order control of crustal rheology on the structural style of mountain building, along strike structural variations are still poorly understood. The Pyrenean mountain chain, forming a narrow asymmetric doubly vergent orogenic wedge along the collision zone between the Iberian and the Eurasian plates, is a typical example of a mountain belt presenting lateral variation in structural style. Using a similar approach combined with geological-geophysical observations, we demonstrate that variation in crustal inheritance due to inherited Variscan crustal composition and accentuated during Mesozoic rifting might also explain the along strike structural variation observed in the Pyrenean chain.
Chevron Tailgate
Start:August 31, 2013 at 4:30 pm
End:
August 31, 2013 at 7:00 pm
Location:
Holland Family Student Center
Contact:
Maurine Riess, mriess@jsg.utexas.edu, 512-232-7673
Meet Chevron representatives, have fun, win prizes, eat!
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 |