T21A:
Evolution and Mechanics of Low-Angle, Normal-Sense Detachment Faults and Their Relationship to Metamorphic Core Complexes and Gneiss Domes II Posters

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Session ID#: 12977

Session Description:
Metamorphic core complexes and gneiss domes are common in orogenic belts and rifts, world-wide.  Although there is consensus that they play a fundamental role in extension and exhumation of lithosphere, and in the transfer of heat, the physical variables controlling their origin and evolution remain enigmatic and controversial, as does the linked evolution of their bounding normal-sense detachment faults.  What controls the diverse range of characteristics of core complexes and gneiss domes in continental and oceanic settings?  For example, does the presence or absence of magmatic heat transfer play a key role? This session focuses on synthesizing our growing knowledge of physical and rheological processes in core complexes to understand how these control the evolution of their structurally bounding detachment faults and shear zones. We welcome contributions in all fields, including structural geology, metamorphic petrology, thermochronology, neotectonics, marine geology and geophysics, experimental deformation, geodynamic modeling, seismology, and geodesy.
Primary Convener:  Timothy A Little, Victoria University of Wellington, Wellington, New Zealand
Conveners:  Elizabeth L Miller, Stanford University, Stanford, CA, United States, Barbara E John, University of Wyoming, Geology & Geophysics, Laramie, United States and Susan M Ellis, GNS Science-Institute of Geological and Nuclear Sciences Ltd, Lower Hutt, New Zealand
Chairs:  Susan M Ellis, GNS Science-Institute of Geological and Nuclear Sciences Ltd, Lower Hutt, New Zealand and Barbara E John, University of Wyoming, Geology & Geophysics, Laramie, United States
OSPA Liaison:  Susan M Ellis, GNS Science-Institute of Geological and Nuclear Sciences Ltd, Lower Hutt, New Zealand
Index Terms:

3035 Midocean ridge processes [MARINE GEOLOGY AND GEOPHYSICS]
8031 Rheology: crust and lithosphere [STRUCTURAL GEOLOGY]
8034 Rheology and friction of fault zones [STRUCTURAL GEOLOGY]
8109 Continental tectonics: extensional [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Timing of mid-crustal ductile extension in the northern Snake Range metamorphic core complex, Nevada: Evidence from U/Pb zircon ages (126585)
Jeffrey Lee, Central Washington University, Ellensburg, WA, United States, Terrence Blackburn, University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, United States and Scott M Johnston, California Polytechnic State University San Luis Obispo, San Luis Obispo, CA, United States
Tectonic origin and deformation process of the Mayer Kangri medium-high pressure metamorphic dome in Central Qiangtang of Tibet (129878)
Yixuan Wang, China University of Geosciences Beijing, School of Earth Sciences and Resources, Beijing, China and Xiao Liang, Australian National University, Canberra, Australia
Cretaceous Southeast-vergent Ductile Shear in the Lower-plate of the Miocene Northwest-vergent Silver Peak – Lone Mountain Extensional Complex, Western Great Basin. (151892)
David T Katopody1, John S Oldow1 and William McClelland2, (1)University of Texas at Dallas, Richardson, TX, United States, (2)University of Iowa, Department of Earth and Environmental Sciences, Iowa City, IA, United States
The Grant Range in eastern Nevada: a ‘proto’ core complex exhumed entirely by brittle, low-angle (≤15°) detachment faults (159002)
Sean P Long, Washington State University, School of the Environment, Pullman, WA, United States and Jerome P Walker, Consulting geologist, Reno, NV, United States
TitaniQ analyses of mylonites from metamorphic core complexes in west-central Arizona: Implications for two phases of extension in the lower Colorado River Extensional Corridor (180301)
Nikki M Seymour1, Martin Wong2 and John S Singleton1, (1)Colorado State University, Department of Geosciences, Fort Collins, CO, United States, (2)Colgate University, Hamilton, NY, United States
Orogenic inheritance in Death Valley region, western US Basin and Range: implications for Neogene crustal extension. (181163)
Rodrigo D Lima1, Nicholas W Hayman1, Michael G Prior2, Daniel F Stockli2 and Eric D Kelly2, (1)Institute for Geophysics, Austin, TX, United States, (2)University of Texas at Austin, Jackson School of Geosciences, Austin, TX, United States
Fault Geometry Evolution and the Flexural Isostatic Response to Faulting in the Ocean-Continent Transition of Magma-Poor Rifted Margins (155652)
Júlia Gómez-Romeu1, Nick Kusznir1, Gianreto Manatschal2 and Alan Roberts3, (1)University of Liverpool, Liverpool, United Kingdom, (2)University of Strasbourg, Strasbourg, France, (3)Badley Geoscience, Spilsby, United Kingdom
Mechanical properties of the Sevier Desert detachment: an application of Critical Coulomb Wedge theory (139602)
Xiaoping Yuan, Ecole Normale Supérieure Paris, Paris, France and Nicholas Christie-Blick, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States
Syn-Extensional Constrictional Folding of the Gwoira Rider Block, a Large Fault-Bounded Slice Atop the Mai’iu Low-Angle Normal Fault, Woodlark Rift. (125705)
Samuel McKeever Webber1, Timothy A Little2, Kevin P Norton2, Marcel Mizera1, Juergen Oesterle1 and Susan M Ellis3, (1)Victoria University of Wellington, School of Geography, Environment and Earth Sciences, Wellington, New Zealand, (2)Victoria University of Wellington, Wellington, New Zealand, (3)GNS Science, Lower Hutt, New Zealand
Geomorphic and Structural Evidence for Rolling Hinge Style Deformation in the Footwall of an Active Low Angle Normal Fault, Mai’iu Fault, Woodlark Rift, SE Papua New Guinea (173063)
Marcel Mizera1, Timothy Little1, Kevin P Norton2, Sam Webber3, Susan M Ellis4 and Juergen Oesterle1, (1)Victoria University of Wellington, School of Geography, Environment and Earth Sciences, Wellington, New Zealand, (2)Victoria University of Wellington, Wellington, New Zealand, (3)Victoria University of Wellington, SGEES, Wellington, New Zealand, (4)GNS Science, Lower Hutt, New Zealand
Dating an actively exhuming metamorphic core complex, the Suckling Dayman Massif in SE Papua New Guinea (189156)
Juergen Oesterle1, Diane Seward1, Timothy Little1, Daniel F Stockli2 and Marcel Mizera1, (1)Victoria University of Wellington, School of Geography, Environment and Earth Sciences, Wellington, New Zealand, (2)University of Texas at Austin, Department of Earth and Planetary Sciences, Austin, United States
Evolution Process and Structural Analysis of Precambrian Jirisan Metamorphic and Sancheong Anorthosite Complexes in the Jirisan Province, Yeongnam Massif, Korea (127366)
Ji-Hoon Kang, Andong National University, Department of Earth and Environmental Sciences, Andong, South Korea and Deok-Seon Lee, Andong National University, Department of Earth and Environmental Sciences College of Natural Sciences, Andong, Korea, Republic of (South)

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