A5066024005- Methane Hydrates and Related Phenomena
- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Offshore Engineering and Technologies
- Geological and Geophysical Studies
- Astro and Planetary Science
- High-pressure geophysics and materials
- Astronomical Observations and Instrumentation
- Geomagnetism and Paleomagnetism Studies
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Geological Modeling and Analysis
- Paleontology and Stratigraphy of Fossils
- Inertial Sensor and Navigation
- Nuclear Physics and Applications
- Planetary Science and Exploration
- Gamma-ray bursts and supernovae
- Seismic Imaging and Inversion Techniques
- Reservoir Engineering and Simulation Methods
- Geological formations and processes
- Solar and Space Plasma Dynamics
- Drilling and Well Engineering
Oregon State University
2015-2024
University of Nevada, Las Vegas
2021-2024
University of Augsburg
2022
University of Oregon
2021
University of Tasmania
2015
International Ocean Discovery Program
2015
National Institutes of Health
2010
Mantle plumes upwelling beneath moving tectonic plates generate age-progressive chains of volcanos (hotspot chains) used to reconstruct plate motion. However, these hotspots appear move relative each other, implying that are not laterally fixed. The lack age constraints on long-lived, coeval hotspot hinders attempts motion and quantify plume motions. Here we provide 40Ar/39Ar ages for a newly identified long-lived mantle plume, which formed the Rurutu chain. By comparing inter-hotspot...
Research Article| May 01, 2016 Identification of the short-lived Santa Rosa geomagnetic excursion in lavas on Floreana Island (Galapagos) by 40Ar/39Ar geochronology Andrea Balbas; Balbas 1College Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, 97331, USA Search for other works this author on: GSW Google Scholar Anthony A.P. Koppers; Koppers Dennis V. Kent; Kent 2Department Earth Planetary Rutgers Piscataway, New Jersey 08854, USA3Lamont-Doherty Observatory,...
Major ± trace element and Sr–Nd–Pb–Hf–He isotope data are presented for more than 300 geochemically diverse basalt samples collected by submersible from the Inflated Central Endeavour Segment of Juan de Fuca Ridge. Seven chemically distinct types present, depleted (D-) to enriched mid-ocean ridge (E-MORB). By combining geochemical with high-resolution bathymetry age determinations, detailed spatial temporal scale on-axis mantle-derived heterogeneity is determined. The basalts define binary...
Research Article| July 01, 2017 10Be dating of late Pleistocene megafloods and Cordilleran Ice Sheet retreat in the northwestern United States Andrea M. Balbas; Balbas 1College Earth, Ocean, Atmospheric Sciences, Oregon State University, Corvallis, 97331, USA2Division Geological Planetary California Institute Technology, Pasadena, 91125, USA Search for other works by this author on: GSW Google Scholar Aaron Barth; Barth USA3Department Geoscience, University Wisconsin–Madison, Madison,...
Abstract Ocean island basalts (OIB) with extremely radiogenic Pb‐isotopic signatures are melts of a mantle component called HIMU (high µ, high 238 U/ 204 Pb). Until now, deeply dredged submarine glasses have not been available, which has inhibited complete geochemical (in particular, volatile element) characterization the mantle. We report major, trace and element abundances in suite from Tuvalu Islands. Three most extreme F/Nd ratios (35.6 ± 3.6) that higher than ratio (∼21) for global OIB...
IODP Expedition 350 was the first to be drilled in rear part of Izu-Bonin, although several sites had been arc axis fore-arc region; scientific objective understand evolution Izu arc, by drilling a deep-water volcaniclastic section with long temporal record (Site U1437). The is dominated series basaltic dacitic seamount chains up ~100-km roughly perpendicular front. Dredge samples from these are geochemically distinct front rocks, and undertaken this asymmetry. Site U1437 lies an ~20-km-wide...
Abstract The Cook-Austral volcanic lineament extends from Macdonald Seamount (east) to Aitutaki Island (west) in the South Pacific Ocean and consists of hotspot-related islands, seamounts, atolls. has been characterized as multiple overlapping, age-progressive hotspot tracks generated by at least two mantle plumes, including Arago which have fed volcano construction for ∼20 m.y. are argued active 70 extend northwest into Cretaceous-aged Tuvalu-Gilbert Tokelau chains, respectively. Large gaps...
Long-lived intra-oceanic arcs of Izu-Bonin-Marianas (IBM)-type are built on thick, granodioritic crust formed in the absence pre-existing continental crust. International Ocean Discovery Program Expedition 350, Site U1437, explored IBM rear arc to better understand formation arcs. Detailed petrochronological (U–Pb geochronology combined with trace elements, oxygen and hafnium isotopes) characterizations zircon from U1437 were carried out, taking care exclude potential contaminants by (1)...
Abstract Changes in the Earth's magnetic field have global significance that reach from outer core extending out to uppermost atmosphere. Paleomagnetic records derived sedimentary and volcanic sequences provide important insights into geodynamo processes govern largest geomagnetic changes (polarity reversals), but dating uncertainties hindered progress this understanding. Here, we report a paleomagnetic record multiple lava flows on Tahiti bracket Matuyama‐Brunhes (M‐B) polarity reversal...
Abstract Age-progressive seamount tracks generated by lithospheric motion over a stationary mantle plume have long been used to reconstruct absolute plate (APM) models. However, the basis of these models requires plumes move significantly slower than overriding lithosphere. When interacts with convergent or divergent boundary, it is often deflected within strong local flow fields associated such regimes. Here, we examined age progression and geometry Samoa hotspot track, focusing on lava...
Abstract The Samoan hotspot generated an age‐progressive volcanic track that can be traced back to 24 Ma at Alexa Bank, but the trace of older portion (>24 Ma) is unclear. We show six seamounts located in and around Magellan Seamount chain—north Ontong‐Java Plateau (OJP)—have ages (87–106 Ma), geochemistry, locations consistent with absolute plate motion model reconstructions late Cretaceous, three additional have geochemistry a origin. However, large segment (24–87 remains unidentified....
Abstract To deconvolve contributions from the four overlapping hotspots that form “hotspot highway” on Pacific plate—Samoa, Rarotonga, Arago-Rurutu, and Macdonald—we geochemically characterize and/or date (by 40Ar/39Ar method) a suite of lavas sampled eastern region Samoan hotspot “downstream” track. We find Papatua seamount, located ~60 km south axis track, has with both HIMU (high μ = 238U/204Pb) composition (206Pb/204Pb 20.0), previously linked to one Cook-Austral hotspots, an enriched...
Volcanic hotspots are thought to initially form by melting in an upwelling mantle plume head followed of the tail. Plate motion then generates age progressive volcanic track originating from a large igneous province that connects active hotspot. However, most voluminous province, ~120 Ma Ontong-Java Nui Plateau (OJP-Nui) mid-Pacific, appears lack such track. Although Louisville hotspot was originally proposed as candidate, limited constraints for Pacific absolute plate and prior 80 suggest...
Abstract Dating submarine basalts using 40 Ar/ 39 Ar geochronology is often hindered by a lack of potassium‐bearing phenocrystic phases and severe alteration in the groundmass. Clinopyroxene common phase seafloor highly resistive to low‐temperature alteration. Here we show that clinopyroxene phenocrysts separated from marine are viable for incremental heating age determinations. We provide results pilot study comprising 16 experiments nine separates, five which samples with dated coeval...
Abstract Over the past 40 years, development of Ceramic Matrix Composites (CMCs) has focused mainly on improvement material performance and optimization cost‐efficient production routes. Recently, more fields application have opened up for CMCs, in which environmental impacts are relevant. These barely been investigated so far but receive growing interest due to increasing awareness consequences. Our innovative approach frames properties relation (e.g., global warming potential CO 2...
Abstract The Northwestern Hawaiian Ridge is an age-progressive volcanic chain sourced from the mantle plume. Proximal to are several clusters of smaller seamounts and ridges with limited age constraints unknown geodynamic origins. This study presents new bathymetric data 40Ar/39Ar determinations lava flow samples recovered by remotely operated vehicle (ROV) two east–west-trending chains that lie north Pūhāhonu Mokumanamana volcanoes. previously unexplored Naifeh Chain (28°48′N,167°48′W)...