A5047772710- Geological and Geochemical Analysis
- Geological and Tectonic Studies in Latin America
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Geological formations and processes
- Geology and Paleoclimatology Research
- Pacific and Southeast Asian Studies
- CO2 Sequestration and Geologic Interactions
- Seismology and Earthquake Studies
- Geochemistry and Elemental Analysis
- Pleistocene-Era Hominins and Archaeology
- Geological Modeling and Analysis
- Geological Studies and Exploration
- Fish biology, ecology, and behavior
- Environmental Science and Water Management
- Isotope Analysis in Ecology
- Advances in Cucurbitaceae Research
- Engineering Technology and Methodologies
- Maritime and Coastal Archaeology
- Geological and Geophysical Studies
- African Botany and Ecology Studies
- Tunneling and Rock Mechanics
- Hydrocarbon exploration and reservoir analysis
- Image Processing and 3D Reconstruction
- Remote Sensing and LiDAR Applications
University of Wyoming
2023-2024
Wyoming Department of Education
2023
The University of Texas at Austin
2018-2021
United States Geological Survey
1987
Indiana University Bloomington
1987
Denver Federal Center
1987
The onset of orogenic shortening in the northern Andes Mountains coincided with latest Cretaceous accretion Caribbean oceanic plateau. We present isotopic data (εHf zircon and εNd) coupled arc position to test whether led abrupt crustal thickening Ecuador Colombia. A rapid excursion toward more evolved compositions was synchronous ca. 75–70 Ma collision preceded a similar deviation Colombia at 70–55 Ma. but diachronous shift signatures is attributed progressive northward plateau associated...
Abstract Cenozoic sedimentary rocks of the intermontane Bagua Basin record Andean orogenic history northern Peru at ~4–7°S. The Peruvian Andes define termination Central and are comprised a narrow, low‐elevation orogen relative to rest Andes. New stratigraphic sedimentologic field observations, subsidence analysis, detrital zircon provenance analysis enable reconstruction regional tectonic history. Late Cretaceous Paleocene U‐Pb age spectra from Fundo El Triunfo Rentema formations reveal...
Abstract Recognizing detrital contributions from sediment source regions is fundamental to provenance studies of active and ancient orogenic settings. Detrital zircon U-Pb geochronology unconsolidated sands modern rivers that have catchments with contrasting bedrock signatures provides insight into the fidelity age in discriminating tectonic downstream propagation environmental signals. We present 1705 new ages for 15 samples river 12 over a large spatial extent Ecuador (∼1°N–5°S ∼79°–77°W)....
The impact of the ca. 75 ka Mount Toba (Indonesia) supereruption on regional and global climate has been controversial. East Africa is pivotal for qualifying this impact, specifically in addressing a hypothesis that eruption caused volcanic winter leading to genetic bottleneck anatomically modern human populations. If Africa, effects should be recorded sediments from climatologically sensitive ecosystems. In deep tropical lakes, cooler temperatures would have reduced density contrast between...