A5010753983- Geological and Geochemical Analysis
- Geomagnetism and Paleomagnetism Studies
- Geology and Paleoclimatology Research
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Space Exploration and Technology
- Astro and Planetary Science
- Planetary Science and Exploration
- High-pressure geophysics and materials
- Earthquake Detection and Analysis
- Archaeology and Natural History
- Geological and Geophysical Studies
- Geological formations and processes
- Hydrocarbon exploration and reservoir analysis
- Paleontology and Stratigraphy of Fossils
- Historical Astronomy and Related Studies
- Landslides and related hazards
- Geological Modeling and Analysis
- Geochemistry and Elemental Analysis
- Maritime and Coastal Archaeology
- South Asian Cinema and Culture
- Magnetic and Electromagnetic Effects
- Fire effects on ecosystems
- Hydrology and Sediment Transport Processes
- Geological Studies and Exploration
United States Geological Survey
2021-2025
Geology, Minerals, Energy, and Geophysics Science Center
2023-2025
Volcano Science Center
2022-2025
Cascades Volcano Observatory
2022-2025
University of Florida
2017-2021
SUNY Geneseo
2019
The Singhbhum craton is one of five Archean cratons constituting the Indian subcontinent. It consists four major lithotectonic units with broadly defined ages from Eoarchean to Neoarchean: Older Metamorphic Group (3.7–3.2 Ga), Tonalite Gneisses (3.8–3.1 Granite (3.5–3.0 and Iron Ore (3.51–2.55 Ga). In this study, 270 zircons were separated modern sediment Baitarani River, which wholly contained within craton. Zircons analyzed laser ablation ICP-MS for their U-Pb systematics; >50% less than...
Abstract The Picture Gorge Basalt (PGB) is part of the Miocene Columbia River Group (CRBG). PGB, which outcrops in eastern Oregon, considered coincident time with voluminous Grande Ronde Basalt. New radiometric ages have expanded age‐range suggesting it began erupting prior to Steens its south and continued until after cessation eruptions, an interval 1.5 Ma. However, existing paleomagnetism PGB implies this eruption timeline overestimate. To reconcile paleomagnetic timescales for we...
<title>Abstract</title> We integrate new geochemical data with field relations, <sup>36</sup>Cl surface-exposure ages, and paleomagnetic to understand the petrogenesis eruption duration of three young basaltic lava flows in northern Harrat Rahat, a distributed volcanic central-western Saudi Arabia. These lavas, collectively referred as Five Fingers, erupted at ~ 24 ka from elongate vent complexes that fall along common lineament. Paleomagnetic central fingers are consistent contemporaneous...
Coupled paleomagnetic and geochronologic data derived from mafic dykes provide valuable records of continental movement. To reconstruct the Proterozoic paleogeographic history Peninsular India, we report directions U-Pb zircon ages twenty-nine in Eastern Dharwar Craton near Hyderabad. Paleomagnetic analysis yielded clusters directional that correspond to dyke swarms at 2.37 Ga, 2.22 2.08 1.89–1.86 1.79 a previously undated dual polarity magnetization. We new positive baked contact tests for...
Abstract In this short paper, we outline the potential links between India and East Antarctica region from Enderby Land to Princess Elizabeth using Mesozoic Gondwana configuration as a starting point. Palaeomagnetic data indicate that did not exist prior Ediacaran–Cambrian. Early Neoproterozoic (1050–950 Ma) deformation in along Eastern Ghats Province marks initial contact two regions. Volcanism Kerguelen hotspot led final break-up of Cretaceous. Although connections Archaean Proterozoic...
Palaeomagnetic data are of variable quality. To assist in a systematic assessment data, set seven quality criteria (VQ1–VQ7) were introduced by Van der Voo. The last those 'VQ7' concerns the possibility remagnetization when particular palaeomagnetic pole resembles younger palaeopole from same stable region. While remagnetizations often culprit, mere resemblance an older to does not priori require that rocks under investigation remagnetized. Given Earth has finite surface area, apparent polar...
Abstract The McClure Mountain–Iron Mountain igneous complex is an alkalic intrusive center in the northern Wet Mountains of southern Colorado. It was emplaced early Cambrian time into gneissic/granitic 1.75–1.45 Ga Proterozoic host rocks. Numerous dikes are associated with complex, primarily along western side. Although main nepheline-syenite body well dated, ages surrounding poorly known. Crosscutting relationships and defined K-Ar dates suggest that younger than intrusion. Paleomagnetic...
Abstract The Archean age granite gneiss basement along the Prydz Bay coastline in East Antarctica hosts north–south-, east–west-, NE–SW- and NW–SE-trending mafic dyke swarms Vestfold Hills region that intruded between 2420 1250 Ma. orientations of dykes do not show a direct correlation with geochemistry. Instead can be broadly discriminated into high-Mg Fe-rich tholeiites. former type is more siliceous, large ion lithophile elements (LILEs), high field strength (HFSEs) light REEs enriched...
The record of reversals the geomagnetic field has played an integral role in development plate tectonic theory. Statistical analyses reversal are aimed at detailing patterns and linking those to core-mantle processes. polarity timescale is a dynamic new paleomagnetic geochronologic data provide additional detail. In this paper, we examine periodicity revealed back 375 million years ago (Ma) using Fourier analysis. Four significant peaks were found power spectra within 16-40-million-year...
Abstract In small‐volume igneous intrusions, the duration of magmatism can be difficult to determine because assembly an intrusion from component magma pulses may occur within geochronologic uncertainties. We demonstrate that paleomagnetic record short‐term movement geomagnetic pole (secular variation) place constraints on over shorter time periods. An analysis 14 C data paired with lava flows illustrates this approach. The paleosecular variation that, when combined maximum rate secular...
Abstract Widely separated basalt lava-flow outcrops in north-central Oregon, USA, expose products of a single eruptive episode. A Pliocene lava flow, here informally termed the Tetherow basalt, issued from vents near Redmond, Deschutes basin as plains-forming now exposed continuous northward for 60 km. similar crops out 47 km farther north, Maupin, within what was then slightly incised ancestral River canyon. The northernmost this flow lie on Fulton Ridge, Dalles basin, confluence and...