Sessions related to MARGINS science at the 2005 AGU Fall Meeting

The diversity and range of MARGINS research and goals make it increasingly difficult to select a shortlist that captures all AGU sessions of special interest to the MARGINS community. However, comments from last year suggest that - although not comprehensive - the list and brief summaries (derived from the full abstracts on the AGU website: can be a handy guide to have at the meeting.

AGU Code Key: Section: Day of Week (1-5) : Session Time (1X-2X: 08:00 and 10:20; 3X-4X: 13:40 and 16:00). E.g., T11E = Tectonics, Monday, Session 1E (13:40). Please refer to the AGU meeting program to verify session times and locations.

MARGINS Sessions

T: Fluids at subduction zones: Integrating models and observations within MARGINS and related studies
Pore fluids and fluid flow play defining roles in subduction zone processes, over a wide range of depths and scales. Such processes include rock diagenesis and alteration, fault zone stability and seismogenesis, upper and lower plate deformation, dehydration reaction in downgoing crust and mantle, magma formation and migration, dynamics of the mantle wedge, and earthquake nucleation. For this reason, characterizing the occurrence and role of fluids at subduction zones has been a key component of both the Seismogenic Zone Experiments (SEIZE) and Subduction Factory (SubFac) Initiative of the NSF MARGINS Program. Unfortunately, direct observations of fluids and fluid processes have been limited. Further progress in understanding the role of fluids can be gained from integrated fluid flow, thermal, chemical, and deformational modeling, calibrated by observations and measurements of subduction zone processes and properties. This session is intended to bring numerical modelers together with those who collect and interpret geophysical, geodetic, seafloor, and drilling data relevant to subduction zone fluids. T11E, T12B (MCC 3011), T13B (MCC Level 1, 0453-0481)

T: Izu-Bonin-Mariana Subduction Factory studies
The Izu-Bonin-Mariana (IBM) system is perhaps the best-studied example of an intra-oceanic arc and a primary focus region for subduction factory studies in the MARGINS programs of several countries. Recently major advances have been made in understanding the geological history and geochemical cycling of the IBM system, and revealing the crust and mantle structure of the IBM arc and backarc. These results have important implications for understanding subduction zone dynamics, mantle flow and magma production in arcs and backarcs, and the formation of arc crust. This session will be comprised of papers on IBM subduction zone studies, including the formation of arc magma and crust, studies of the geological history or current tectonics of the arc, constraints on geophysical structure and mantle flow, and modeling studies with implications for the IBM system. T44A (MCC 3024), T53A (MCC Level 2, 1393-1416)

Sessions relevant to MARGINS science

ED: Integrating education and outreach with large-scale experiments
Large-scale, long-term experiments, such as EarthScope, Cassini, and IODP, frequently capture the public's imagination, providing unique education and outreach opportunities. This session focuses on such efforts and the special issues inherent to large scale experiments, with emphasis on developing and maintaining high levels of public interest and interaction. ED11E (MCC Level 2, 1126-1131), ED14A (MCC 3007)

ED: Research Experiences for Undergraduates (REU) at 25: Its impact on undergraduate education in the sciences
In recognition of 25 years of the National Science Foundation-Research Experiences for Undergraduates (NSF-REU) Program, this session will highlight REU initiatives, examine best practices for research with undergraduates in different scientific disciplines, and assess the role of REU in Bachelor's degree programs today. ED31A (MCC Level 2, 1195-1203), ED41A (MCC 3009)

ED: Undergraduate research in the earth and environmental sciences: shaping the cutting edge of our discipline
This session will explore the role of undergraduate research in establishing the future direction of the Earth and Environmental Sciences. Contributors will showcase examples of the diverse research projects in which undergraduate students are involved. ED31B (MCC Level 2, 1204-1214), ED41B (MCC 3009)

G: Aseismic deformation transients and their relationship to earthquakes
Transient deformation is often detected after moderate or large earthquakes nearby, and includes triggered slip on other faults, afterslip on or near the co-seismic rupture, and viscous and poroelastic deformation in the lower or upper lithosphere, or it can be associated with other static or dynamic stress changes. Much of this deformation is aseismic or seismically small, but non-seismic measurements and modeling of causes and effects can provide information on the material properties of fault zones and adjacent lithosphere. G43A, G44A (MCC 3005), G51B (MCC Level 2, 0811-0836)

H: Beyond steady state: The dynamics of transient landscapes
The last decade has witnessed significant progress in understanding the linkages among climate, surface processes, and tectonics. Contributions to this session pertain to the transient evolution of landscapes at all scales, from hillslope to orogen, and how transient conditions influence interpretation of data. H31A (MCC Level 2, 1261-1288), H33F,   H34A (MCC 3000)

H: Impacts of hydrology on landscape evolution
Hydrologic processes play important roles in many aspects of long-term landscape evolution, but also depend on the landscape morphology, introducing a feedback mechanism in the system. This session explores links between climatology, basin hydrology, and long-term landscape evolution via theoretical, observational, and experimental contributions. H42B (MCC 3002), H43D (MCC Level 1, 0516-0530)

H: Constructional landscapes: From deltas to leveed channels
Channels that build their own banks are the dominant conduits for water and sediment transport in many subaerial and subaqueous landscapes from lakes to the deep-marine continental slope. This session shares advances in understanding the initiation and growth of leveed channels and deltas, as well as the landforms they construct, based on field, laboratory or numerical studies across multiple disciplines. H44D (MCC 3011), H51D (MCC Level 1, 0393-0404)

H: Coupling sediment transport and channel morphology
Much remains to be learned about how flow and sediment transport interact to produce the morphology of natural channels. Contributions relate sediment transport to the stream morphology across a range of scales, including studies linking field or laboratory based measurements of sediment transport to channel adjustment processes. H51H, H52A (MCC 3000), H53B (MCC Level 1, 0455-0476)

H: The hydrogeomorphic interface: Temporal and spatial scales of interaction between hydrology and geomorphology
Hydrology, geomorphology and aspects of riverine ecology strongly interact within the context of a stream channel network. Highlights of this session include: 1) interaction between a changing hydrologic regime, sediment supply and/or stability of   channel morphology; 2) interaction between stream flow regulation, riparian vegetation and channel dynamics; and 3) temporal and spatial variation of channel forming flows in drainage networks. H41I (MCC 3003), H43C (MCC Level 1, 0506-0515)

H: Quantitative studies of the sources, fate, and transport of dissolved and suspended materials in streams
Rivers and streams are conduits for naturally derived solutes and anthropogenically-produced contaminants in dissolved and particulate forms. Topics include: 1) weathering, erosion and denudation, and riverine transport of particulate and dissolved materials; 2) quantitatively identifying or budgeting sediment sources; 3) novel statistical methods to estimate contaminant loads from intermittent concentrations data and continuous stream flow data. H42B (MCC 3000), H31D (MCC Level 2, 1325-1341)

IN: Building a global geoscience cyberinfrastructure: International collaboration in geoinformatics
The emerging cyberinfrastructure for geoscience must be an international effort in order to successfully promote advances in geoscience research and enable new approaches to addressing scientific problems that in turn lead to new discoveries and an improved understanding of the Earth. This sessions focuses on collaboration and integration of international digital data, information, analysis and visualization tools. IN43C,   IN44A (MCC 3018), IN51A (MCC Level 1, 0305-0316)

S: Fault-zone properties and earthquake rupture dynamics
Recent studies show that fault zone materials, fault structures, and stresses applied to the fault significantly affect earthquake rupture dynamics and near-fault ground motions. Contributions include integration of seismic reflection profiles, drilling of active fault zones, in-situ measurements in boreholes, and structural and microstructural studies that define the prevailing deformation processes affecting the faulting process. S31B, S32B, S33C, S34A (MCC 3020), S41B, S43A (MCC Level 2, 0977-1002, 1039-1068)

T: Subduction-zone paleoseismology on the Pacific Rim
A forum on long records of great earthquakes at Pacific Rim subduction zones, including earthquake sizes and recurrence intervals, comparisons with the ‘04 and ‘05 Sumatran earthquakes, and applications to seismology, geodesy, engineering, and tsunami simulation. T11A (MCC Level 1, 0346-0362)

T: Static and dynamic strengths of faults: Merging field, laboratory and numerical approaches
The nature of slip on active faults is strongly controlled by shear resistance which depends on factors such as accumulated slip, roughness, presence of fluids, temperature, pressure and transport properties. This session examines relationships between specific micromechanical processes as observed in the laboratory, field and imaged in micromechanical models, and their macroscopic mechanical response. T13E, T14B (MCC 3011), T21B (MCC Level 1, 0460-0487)

T: Dynamics, structure, and composition of subduction zones
Understanding the interplay between dynamics, structure and composition is crucial to developing a comprehensive model of the shallow portions of the subduction zone system.   This session focuses on research into the critical parameters affecting subduction zone creation, evolution and behavior, including observations and modeling in novel multidisciplinary studies. T31D (MCC 3011), T33B, T33C (MCC Level 1, 0528-0582), T41F, T42A (MCC 3011)

T: Comprehensive testable predictions of geodynamic models
Recent advanced geodynamic models operate with large number of parameters whose adjustment may allow fitting of geological and geophysical constraints, but do not necessarily prove their validity. The aim of this session is to attract attention of the geodynamic modelers to the importance of verification and testing of their models and to involve geologists and geophysicists in discussion of how to accomplish this. T12A, T13F, T14A (MCC 3024), T21C (MCC Level 1, 0488-0521)

T: Extensional tectonics and metamorphic core complexes: Their metamorphic, petrographic, and kinematic evolution
Within the last quarter century, our understanding of continental extensional tectonics and associated metamorphic core complexes has improved substantially, but there are still many important questions and debates. As a catalyst for new research, this session brings together researchers working on these problems in the well studied extensional terranes of the Basins and Ranges of western North America and the Aegean region of southeastern Europe. T13C (MCC Level 1, 0482-0493), T24C (MCC 3022)

T: Mechanisms of continental extension during basin and rifted-margin formation
The mechanisms by which continental crust thins from >30 km to <6 km prior to break-up are not well understood, and there is no consensus on the rheological behavior of the lower crust during extension. This session considers observational data and numerical models that give insights into processes such as fault array evolution and strain localization, strain partitioning with depth, evolving rift (a)symmetry, and conjugate margin subsidence patterns. T43B (MCC Level 2, 1389-1415), T51E, T52B, T53E (MCC 3011)

V: Will the real phenocryst please stand up?
Fractional crystallization is the dominant process promoting magma differentiation, but many erupted magmas contain solid phases that are complexly zoned and/or demonstrably out of equilibrium with their host melts. This session addresses the important challenge of converting the information carried by magma's ‘crystal cargo' into process-related and component-specific constraints on magma evolution. V11A, V12A (MCC 3007), V13B (MCC Level 1, 0523-0557) .

V: The agent of mass transfer in subduction zones: Fluid, melt, or supercritical?
Thermal and chemical exchange between subducting oceanic lithosphere and the overlying mantle wedge at convergent margins produces what is arguably the most physically and compositionally complex melting regime in the upper mantle. This session brings together evidence bearing on the physical and chemical nature of the subduction component and the mass transfer process in subduction zones. V31C (MCC Level 1, 0618-0641), V33C, V34A (MCC 3009)

V: From the mantle to the surface and back again: Deep storage, degassing, and subduction of terrestrial volatiles
This session examines terrestrial volatiles in the Earth's interior, including their characteristics in different mantle phases/reservoirs, their role during melting, and their cycling to/from the exosphere. Multidisciplinary contributions encompass all aspects of deep Earth volatile cycles. V41A (MCC Level 2, 1416-1437), V51F, V52A, V53F (MCC 3009)

V: Development and evolution of intraoceanic arc crust: The record from crustal sections and xenoliths
The goal of this session is to bring together studies of well-exposed arc crustal sections to gain a better understanding of the growth and evolution of intraoceanic arcs and the development of continental crust. The session also includes abstracts on continental arc lower crust and xenolith studies from modern arc settings. V44C (MCC 3007), V51D (MCC Level 2, 1513-1526)

V: Temperature, chemistry, and dynamics of the mantle
To provide stronger constraints on mantle convection, volcanism, and plate tectonics, an improved understanding of the major element, trace element, isotopic, and thermal structure of the mantle is required. This interdisciplinary session will address all aspects of the variations of temperature and chemistry of the mantle and their implications for mantle dynamics and the contentious debate on mantle plumes. V31F, V32B, V33D (MCC 3007), V41C (MCC Level 2, 1453-1473), V41E (MCC Level 2, 1503-1522),   V43E (MCC 3007)

Other Sessions of interest

G: Plate Boundary Observatory and Crustal Deformation. G21B (MCC Level 2, 1263-1284)

GP: New insights into Earth's properties and processes from electrical conductivity studies. GP34A (MCC 3008), GP41B (MCC Level 2, 0867-0882)

H: Exploring the response of high-latitude landscapes and processes to global change. H51G (MCC Level 1, 0440-0450), H53I (MCC 2002)

IN: Emerging better, or best, practices for Distributed Data Systems and Virtual Observatories. IN23C, IN24A (Marriott Salon 10), IN31B (MCC Level 2, 1143-1159)

IN: Data fusion. IN31A (MCC Level 2, 1137-1142)

OS: Sedimentation, overpressure, and slope stability along deepwater continental margins. OS21A (MCC Level 2, 1505-1522), OS24A (MCC 2010)

S: Earthquake hazards forecasting: Reality, potential, and applications. S42B, S43D, S44B (MCC 3020), S51D, S53B (MCC Level 2, 1027-1048, 1092-1110)

S: The earthquake source. S11C, S12A (MCC 3022), S13B (MCC Level 1, 0188-0209)

S: Earthquakes, active sources and tectonics. S21C, S22A (Marriott Salon 3), S23B (MCC Level 1, 0232-0263)

S: Fault-zone   properties and earthquake rupture dynamics. S31B, S32B, S33C, S34A (MCC 3020), S41B, S43A (MCC Level 2, 0977-1002, 1039-1068)

T: Links between ophiolites and the lost large igneous provinces record. T11C (MCC Level 1, 0394-0403), T21E (Marriott Salon 5)

T: Crustal construction, tectonic, alteration, microbiological, and transport processes on the flanks of mid-ocean ridges. T23F (MCC 3022), T33A, T33D (MCC Level 1, 0509-0527, 0583-0597)

T: Geothermal systems: Fantastic natural laboratories and a valuable energy resource. T22A (Marriott Salon 5), T23B (MCC Level 1, 0538-0562),

T: Continental margins: Geodynamic constraints and implications for the legal continental shelf under UNCLOS. T21C (Marriott Salon 5), T13D (MCC Level 1, 0494-0510)

U: Interdisciplinary studies of the 26 December 2004 Great Sumatra-Andaman Earthquake and Tsunami. U11A, U11B (MCC Level 2, 0801-0842), U13A, U14A, U21C, U22A (Marriott Salon 7)

U: Frontiers of geophysics lecture: The 2004 Sumatra mega earthquake: Lessons from a monster. U22B (13:00, Marriott Salon 9)

U: Beyond plate tectonics. U43B (MCC Level 2, 0828-0837), U51B, U52A, U53A (MCC 3001)

V: Massive collapse of volcanoes in island arcs and continental volcanic arcs: Structure, mechanics, and implications of instability. V13F (Marriott Salon 10), V21B (MCC Level 1, 0598-0607)

V: Seamount hydrothermal systems: Volcanology, biology, geochemistry and oceanography. V44A (MCC 3009), V51C (MCC Level 2, 1489-1512)


Last updated Wednesday, November 30, 2005