A5034073061- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Global trade and economics
- Geology and Paleoclimatology Research
- Embedded Systems Design Techniques
- Global Trade and Competitiveness
- Thermal and Kinetic Analysis
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Geological and Tectonic Studies in Latin America
- Global Energy and Sustainability Research
- Climate Change Policy and Economics
- Paleontology and Stratigraphy of Fossils
- Reproductive Physiology in Livestock
- Mineralogy and Gemology Studies
- Neural Networks and Applications
- Atmospheric chemistry and aerosols
- Economic Theory and Policy
- Low-power high-performance VLSI design
- Antibiotic Use and Resistance
- VLSI and FPGA Design Techniques
- Vascular Procedures and Complications
- Data-Driven Disease Surveillance
Texas A&M University
2023-2024
The University of Texas at Austin
1997-2020
Geophysical Laboratory
1970-2019
Carnegie Institution for Science
1971-2019
Commonwealth Scientific and Industrial Research Organisation
1996
K Lab (United States)
1994
Environment Agency
1993
Building Research Establishment
1990
Lherzolite and harzburgite inclusions from the Green knobs kimberlitic diatreme on Colorado Plateau have textures characterized by clusters of coarse-grained, intergrown enstatite, diopside, spinel. The high molar fraction spinel in these indicates that they formed reaction olivine garnet. Similar been described peridotite basalt ophiolite complexes. texture seems less common examined Basin-Range province western United States than Plateau. reflects transport garnet through garnet-spinel...
Abstract Laramide crustal deformation in the Rocky Mountains of west‐central United States is often considered to relate a narrow segment shallow subduction Farallon slab, but there no consensus as how along slab‐mantle lithosphere interface was accommodated. Here we investigate mantle rocks associated with hydration and shear above flat‐slab at its contact base North American plate. The focus on are deformed, hydrated, ultramafic inclusions hosted within diatremes Navajo Volcanic Field...
The interplay between the evolution of mantle and crust has been investigated by textural electron probe analysis Cr‐diopside spinel peridotite xenoliths from six localities comparisons to a database mineral compositions. are on 300‐km transect Colorado Plateau into adjoining Rio Grande rift. Typical xenolith populations province have magnesian olivine (average Fo 90.5 ) Ti Na‐poor clinopyroxene. In contrast, typical rift Basin Range characterized more Fe‐rich 89.6 clinopyroxene with range...
Garnetite xenoliths from ultramafic diatremes in northeastern Arizona provide insights into hydration and metasomatism the mantle. The garnetites contain more than 95% garnet, some of which has complex compositional zonation related to growth fractures within grains. Accessory minerals include rutile, ilmenite, chlorite, clinopyroxene, zircon. Zircon grains one rock were analyzed situ determine U–Pb ages Hf isotopic compositions. Most analyses plot on or near concordia range 60–85 Ma but a...
We have measured Sr and Nd isotopic composition rare earth element (REE) abundances in a variety of inclusions host minettes from the Navajo Volcanic Field Colorado Plateau order to develop geochemical constraints on evolution mantle beneath relatively undisturbed Proterozoic crust Plateau. Spinel garnet peridotites eclogites derived less than 80 km depth signatures (e.g., light REE (LREE) depletion) similar oceanic lithosphere; we interpret these rocks be fragments lithosphere, possibly...
Antigorite peridotite, Cr-magnetite dunite, chlorite harzburgite, and other ultramafic rock fragments included in the Green Knobs diatreme NW New Mexico are used to investigate evolution of mantle wedge during low-angle subduction. The diatreme, part Navajo Volcanic Field, has a matrix serpentinized microbreccia (SUM). meta-peridotite inclusions have been characterized by petrographic, electron microprobe, bulk-rock analysis. assemblage antigorite–diopside–olivine formed was stable mantle....
Analyses of minerals in xenoliths from the Grand Canyon volcanic field (≤1 Ma) and published results Navajo (20–30 constrain history mantle below Colorado Plateau. The establish that was cool to a depth at least 140 km, until heated by magma just before eruption, so no frictional heating recorded shallow subduction plateau Cenozoic time. temperature record is consistent with low elevation uplift consequent igneous events ∼ 25 Ma. Rims spinel peridotite temperatures range 800–1000 °C ≤1...
Research Article| July 01, 1997 Dating crust-mantle separation: Re-Os isotopic study of mafic xenoliths from central Arizona Sonia Esperança; Esperança 1Department Geology, University Maryland, College Park, Maryland 20742 Search for other works by this author on: GSW Google Scholar Richard W. Carlson; Carlson 2Department Terrestrial Magnetism, Carnegie Institution Washington, 5241 Broad Branch Road, N.W., D.C. 20015 Steven B. Shirey; Shirey Douglas Smith 3Department Geological Sciences,...
Eclogite and pyroxenite xenoliths from ultramafic diatremes of the Navajo province on Colorado Plateau have been analyzed to investigate hydration continental mantle effects low‐angle subduction wedge. Xenoliths characterized by petrographic electron probe analysis Sm‐Nd, Rb‐Sr, K‐Ar, O isotopic mineral separates one eclogite U‐Pb zircons three samples. K‐Ar phengite establishes eruption a Garnet Ridge, Arizona, diatreme at 30 Ma. Sm‐Nd Rb‐Sr analyses clinopyroxene garnet that document...