A5073274104- Geological and Geochemical Analysis
- Astro and Planetary Science
- Planetary Science and Exploration
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- High-pressure geophysics and materials
- Geological formations and processes
- Isotope Analysis in Ecology
- Space Exploration and Technology
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Geomagnetism and Paleomagnetism Studies
- Geological and Geophysical Studies Worldwide
- Geological and Geophysical Studies
- Geological and Tectonic Studies in Latin America
- Mineralogy and Gemology Studies
- Methane Hydrates and Related Phenomena
- Pleistocene-Era Hominins and Archaeology
- Maritime and Coastal Archaeology
- Silicon Effects in Agriculture
- Marine and environmental studies
- Hydraulic Fracturing and Reservoir Analysis
University of Houston
2015-2024
Johnson Space Center
2015
Lunar and Planetary Institute
2014
Chinese Academy of Sciences
2008
Nanjing Institute of Geology and Paleontology
2008
University of Pennsylvania
2008
University of the West of Scotland
2008
University of California, Riverside
2008
Academia Sinica
2008
University of Wisconsin–Madison
2003-2005
Martian meteorite ALH84001 (ALH) is the oldest known igneous rock from Mars and has been used to constrain its early history. Lutetium-hafnium (Lu-Hf) isotope data for ALH indicate an age of 4.091 +/- 0.030 billion years, nearly coeval with interval heavy bombardment cessation martian core dynamo magnetic field. The calculated Lu/Hf Sm/Nd (samarium/neodymium) ratios parental magma source that it must have undergone extensive processing associated crystallization a deep ocean. This same...
New detrital zircon and isotopic (Nd Sr) analyses from the eastern Pamir provide information on depositional age tectonic terrane affiliation of regional metamorphic terranes. Our results show following. First, metasedimentary units along Kongur Shan extensional system dominantly yield Triassic maximum ages, with a similar distribution to Tibetan Songpan‐Ganzi terrane. Further, quartzofeldspathic gneisses in core Muztaghata massif protoliths are granites. These interpreted be part...
Abstract Martian meteorites are the only direct samples from Mars, thus far. Currently, there a total of 262 individual originating at least 11 ejection events. Geochemical analyses, through techniques that also used on terrestrial rocks, provide fundamental insights into bulk composition, differentiation and evolution, mantle heterogeneity, role secondary processes, such as aqueous alteration shock, Mars. display wide range in mineralogy chemistry, but predominantly basaltic composition....
The timing and nature of igneous activity recorded at a single Mars ejection site can be determined from the isotope analyses Martian meteorites. Northwest Africa (NWA) 7635 has an Sm-Nd crystallization age 2.403 ± 0.140 billion years, data indicate that it is derived incompatible trace element-depleted mantle source similar to which produced geochemically distinct group 327- 574-million-year-old "depleted" shergottites. Cosmogenic nuclide demonstrate NWA was ejected 1.1 million years ago...
Abstract Laterally extensive outcrops in south-central Utah of the Turonian Ferron Notom Delta Complex and its bounding shales contain numerous chronometrically age-dated bentonite beds. The chronometry enables estimation rates accommodation accumulation change. Integration 56 measured sections walking tracing beds allowed rigorous application concept shoreline trajectory, using lower bentonites as stratigraphic datums. Geometric stratal relationships along with facies dislocations were used...
Inner Solar System bodies are depleted in volatile elements relative to chondrite meteorites, yet the source(s) and mechanism(s) of volatile-element depletion and/or enrichment poorly constrained. The timing, mechanisms quantities present early inner have vast implications for diverse processes, from planetary differentiation emergence life. We report major, trace contents a glass bead derived D'Orbigny angrite, hydrogen isotopic composition this that coexisting olivine silicophosphates,...
Abstract Changes in Earth’s surface elevation can be linked to the geodynamic processes that drive uplift, which turn modulate regional climate patterns. We document hydrogen isotopic compositions of hydrated volcanic glasses and modern stream waters determine late Cenozoic uplift across Peruvian central Andes. Modern water reproduce mean catchment elevations a precision better than ±500 m (1σ). Glass data show spatiotemporally variable transition from isotopically heavy light compositions....
Abstract Major and trace‐element zoning in garnet, combination with Rb–Sr, Sm–Nd Lu–Hf geochronology, provide evidence for a protracted garnet growth history the Zermatt‐Saas Fee ( ZSF ) ophiolite, western Alps. Four new ages from Pfulwe c . 52–46 Ma) one Chamois 52 are very similar to previously published age Lago di Cignana. Overall, similarity of geochronological patterns suggests that these three localities had prograde tectonic history, commensurate their structural position near top...
The functional form of instrumentally produced mass fractionation associated with MC‐ICP‐MS analysis is not accurately known and therefore cannot be fully corrected by traditional approaches internal normalization using power, linear, or exponential mass‐bias laws. We present a method for robust correction mass‐fractionation both spiked unspiked samples that can applied to Hf as well Nd, Sr, Os, etc. Correction 176 Hf/ 177 follows approach an law, followed standard composition, such JMC‐475....
Abstract– Northwest Africa (NWA) 5298 is an evolved basaltic shergottite that has bulk characteristics and mineral compositions consistent with derivation from oxidized reservoir in Mars. Chemically zoned clinopyroxene (64.5%, augite pigeonite), interstitial lath‐shaped plagioclase (29.4%, An 40 to 55 ), constitutes the of this meteorite. The been converted by shock both isotropic maskelynite spherulitic, birefringent feldspar representing a quenched vesicular melt. remainder rock consists...
Research Article| August 01, 2013 Linking Time to the Pressure–Temperature Path for Ultrahigh-Pressure Rocks William C. McClelland; McClelland 1Department of Earth and Environmental Sciences, University Iowa, Iowa City, IA 52242, USAE-mail: bill-mcclelland@uiowa.edu Search other works by this author on: GSW Google Scholar Thomas J. Lapen 2Earth Atmospheric Houston, TX 77204, USA Elements (2013) 9 (4): 273–279. https://doi.org/10.2113/gselements.9.4.273 Article history first online: 09 Mar...
The deep submergence research vehicle Shinkai 6500, diving on the Challenger segment of Mariana forearc, encountered a superstructure nascent arc crust atop younger mantle with entrained fragments metamorphosed crust. A plutonic block from this collected at 4900 m depth has crystallization age 46.1 Ma and mixed boninitic-arc tholeiitic geochemical signatures. hornblende garnetite two epidote amphibolites were retrieved depths between 5938 6277 in an area dominated by peridotite. appears to...