A5033376000- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geological formations and processes
- Landslides and related hazards
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Cryospheric studies and observations
- Geological Modeling and Analysis
- Geochemistry and Geologic Mapping
- Geological Studies and Exploration
- Geological and Geophysical Studies
- Seismic Imaging and Inversion Techniques
- Winter Sports Injuries and Performance
- Hydrocarbon exploration and reservoir analysis
- Seismic Waves and Analysis
- Archaeology and Natural History
- Geological and Geophysical Studies Worldwide
- Earthquake Detection and Analysis
- High Altitude and Hypoxia
- Seismology and Earthquake Studies
- Engineering Education and Curriculum Development
- Atmospheric and Environmental Gas Dynamics
- Historical and Architectural Studies
- Metallurgy and Cultural Artifacts
- Eurasian Exchange Networks
Montana State University
2016-2024
United States Department of Energy
2020
Kansas State University
1997-2006
University of Maine
1991-1995
Massachusetts Institute of Technology
1989
ETH Zurich
1989
Google (United States)
1988
In eastern Nepal, structural and petrologic observations suggest that movement on the Main Central Thrust (MCT), development of an inverted metamorphic sequence, leucogranite plutonism were genetically related. Samples from across MCT zone its hanging wall, Tibetan Slab, collected four locations in Everest region for 40 Ar/ 39 Ar studies: (1) zone, (2) lower (3) upper Slab away intrusive rocks, (4) adjacent to including leucogranitic material. Within muscovite hornblende yield cooling ages...
ABSTRACT The Main Central Thrust (MCT) south of Mt Everest in eastern Nepal is a 3 to 5km thick shear zone separating chlorite‐bearing schist the lower plate from sillimanite‐bearing migmatitic gneiss overlying Tibetan Slab. metamorphic grade increases through MCT toward structurally higher levels. Previous workers have suggested that either post‐ or synmetamorphic thrust movement has caused this inversion isograds. In an effort quantify increase and constrain proposed structural relations...
Abstract The Greater Himalayan Slab (GHS) is composed of a north-dipping anatectic core, bounded above by the South Tibetan detachment system (STDS) and below Main Central thrust zone (MCTZ). Assuming simultaneous movement on MCTZ STDS, GHS can be modelled as southward-extruding wedge or channel. New insights into extrusion-related flow within emerge from detailed kinematic vorticity analyses in Everest region. At highest structural levels, mean number ( Wm ) estimates 0.74–0.91 c....
Recent studies that integrate conventional thermobarometry of pelitic mineral assemblages with thermodynamic modeling garnet zoning reveal complex Tertiary P -T paths for the Greater Himalayan metamorphic sequence in central Himalaya. Viewed light our current understanding structural evolution Himalaya, these data provide insights into relations between tectonic and thermal processes during orogenesis. In this paper, we present an interpretive model tectonothermal Himalaya part range. This...
In many mountain belts metamorphic sequences occur in an inverted arrangement such that rocks of higher grade overlie lower grade. some locations as the Main Central Thrust (MCT) zone Himalaya, inversion is coincident with ductile thrust deformation. Although explanations have been suggested for none are consistent all observed features. A new model based on observations from eastern Nepal Himalaya consists sequence due to shearing a pre-existing right-way-up metamorphism. This simple...
Research Article| October 01, 1992 Lateral displacement during Neogene convergence in the western and central Alps Mary Hubbard; Hubbard 1Department of Geological Sciences, University Maine, Orono, Maine 04469 Search for other works by this author on: GSW Google Scholar Neil S. Mancktelow 2Geologisches Institut, ETH-Zentrum, CH-8092 Zürich, Switzerland Author Article Information Publisher: Society America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print 0091-7613 Geology (1992) 20...
The continental collision process has made a large contribution to growth and reconfiguration of cratons throughout Earth history. Many the mountain belts present today are product such as Appalachians, Alps, Cordillera, Himalaya, Zagros, Papuan Fold Thrust Belt. Though collisional generally elongate laterally continuous, close inspection reveals disruptions variations in thrust geometry kinematics along strike range. These lateral typically coincide with cross structures have been...
Thermobarometric data for samples across the Main Central thrust zone in eastern Nepal show an inversion temperature but not pressure. These have been interpreted to represent a portion of paleogeotherm at time deformation. A 40Ar/39Ar age on hornblende (closure (Tc)=500±50°C) constrains timing this deformation be ∼21±0.2 Ma. The ages other minerals (muscovite, Tc=350°C, (t)=12.0±0.2 Ma; K‐feldspar, Tc=220°C, t=8.0±0.2 Ma) from same location further constrain cooling history region. Together...
Kinematic data associated with both Laramide‐age and ‐style Rio Grande rift‐related structures show that the latest Cretaceous to Neogene interaction between Colorado Plateau North American craton was dominantly coupled a component of dextral shear. Consistent earlier studies, minor‐fault in this study yielded results varied kinematics. Inverted common northeast‐oriented hemisphere, mean trend kinematic shortening is $$056^{\circ }\pm 6$$ °. west‐oriented extension rifting $$300^{\circ 34$$...
In April and May 2019, as part of National Geographic Rolex's Perpetual Planet Everest Expedition, an interdisciplinary scientific effort conducted a suite research on the mountain recognized many changing dynamics, including emergent risks resulting from natural anthropogenic changes to biological system. this Primer, diverse teams highlight ecosystem human health, geologic hazards, climbing conditions that could affect local community, climbers, trekkers in future. We bring together...
From studies of structure, metamorphism, and geochronology we have evidence that the Norumbega Fault Zone represents a transition from mid- to shallow crustal levels in dextral, transcurrent shear zone within northern Appalachian Orogen. The strikes parallel orogen (northeast-southwest), is ~5 30 km wide, characterized by distributed ductile dextral fabrics southwestern section with brittle toward northeast. Within shear, deformation partitioned into local zones very high strain. Upright,...
The Everest region is characterized by its alpine glacial environment. In an effort to understand environmental change and tectonic activity, our team cored Taboche Lake, situated at 4,712 m along the western margin of Ngozumpa Glacier. This research catalogs past earthquakes using geological records lake core that are important for assessment future earthquake hazards in provides information risk floods. Core grain size characteristics internal sedimentary structures from computed...
As a product of continental collision, the Himalaya developed major thrust and fold structures to accommodate convergence.  With subduction Indian continent beneath Asia, deformation front has migrated southward over time.  The result these tectonic structural processes is world’s highest mountain belt that exposes rocks large span ages had dynamic geomorphological evolution for past 50-60 million years.  now home more than 53 people.  These...