A5030591061- Geological and Geochemical Analysis
- Methane Hydrates and Related Phenomena
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Geophysics and Gravity Measurements
- Geological and Geophysical Studies
- Spacecraft and Cryogenic Technologies
- Offshore Engineering and Technologies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Geomagnetism and Paleomagnetism Studies
- Geological Modeling and Analysis
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Paleontology and Stratigraphy of Fossils
- Inertial Sensor and Navigation
- Planetary Science and Exploration
- Reservoir Engineering and Simulation Methods
- Geological and Tectonic Studies in Latin America
- Drilling and Well Engineering
- Seismic Imaging and Inversion Techniques
Western Washington University
2005-2024
International Ocean Discovery Program
2015-2024
Expedition (United Kingdom)
2024
Geological Society of America
2023
Planetary Science Institute
2023
University of California, Davis
2023
University of Victoria
2023
California State University, Fresno
2023
West Virginia University
2023
University of Colorado Boulder
2023
The Tonsina ultramafic and mafic assemblage, located in the northern Chugach Mountains along Trans‐Alaska Crustal Transect (TACT), is interpreted to be remains of a magma chamber that crystallized at base mature interoceanic island arc. It one number isolated masses peridotite gabbro comprise basal part Peninsular terrane fringe southern Alaska. These masses, roots mid‐Jurassic arc, have been uplifted north dipping Border Ranges fault system crop out sporadically for 700 km from Kodiak...
The Early to Middle Jurassic Talkeetna Arc section exposed in the Chugach Mountains of south–central Alaska is 5–18 km wide and extends for over 150 km. This accreted island arc includes exposures upper mantle volcanic crust. comprises six lithological units, order decreasing depth: (1) residual harzburgite (with lesser proportions dunite); (2) pyroxenite; (3) basal gabbronorite; (4) lower crustal (5) mid-crustal plutonic rocks; (6) rocks. pyroxenites overlie peridotite, with some...
Deformed ultramafic xenoliths with basaltic salvages occur in a postglacial ejecta deposit from Adagdak volcano on Adak Island the central Aleutian Arc. These dunites, wehrlites, clinopyroxenites, and amphibolites are interpreted to be cumulates primitive arc magmas that formed magma chambers beneath crust-mantle boundary. The similar composition xenolith's host basalt (11.8% MgO). Trace element Nd Sr isotopic data consistent derivation of these same parent as other calc-alkaline volcanic...
Research Article| January 01, 1991 High-Mg, low-Al bulk composition of the Talkeetna island arc, Alaska: Implications for primary magmas and nature arc crust SUSAN M. DEBARI; DEBARI 1Geology Department, Stanford University, Stanford, California 94305 Search other works by this author on: GSW Google Scholar NORMAN H. SLEEP Author Article Information Publisher: Geological Society America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print 0016-7606 GSA Bulletin (1991) 103 (1): 37–47....
Abstract Large explosive volcanic eruptions from island arcs pour pyroclastic currents into marine basins, impacting ecosystems and generating tsunamis that threaten coastal communities infrastructures. Risk assessments require robust records of such highly hazardous events, which is challenging as most the products lie buried under sea. Here we report discovery by IODP Expedition 398 a giant rhyolitic pumice deposit emplaced 520 ± 10 ky ago at water depths 200 to 1000 m during...
Abstract Caldera-forming eruptions of silicic volcanic systems are among the most devastating events on Earth. By contrast, post-collapse activity initiating new caldera cycles is generally considered less hazardous. Formed after Santorini’s latest caldera-forming eruption ~1600 bce , Kameni Volcano in southern Aegean Sea enables eruptive evolution a recharging multi-cyclic to be reconstructed. Kameni’s record has been documented by onshore products and historical descriptions mainly...
Crystals and glass discharged as tephra during explosive volcanic eruptions provide a valuable window into magmatic processes. Kolumbo, shallow submarine volcano on the Hellenic Arc of southern Aegean Sea, recently erupted in 1650 CE was both violently tsunamigenic, resulting significant loss life neighboring Santorini. Developing conceptual model magma storage eruption processes at Kolumbo is crucial for improving preparedness this volcanically active densely populated region. Using situ...
Phenocrysts in magmas are often assumed to be the product of crystallization directly from a host magma. However, decades research suggests that crystals carried (crystal cargo) far more complex. We test hypothesis textural and chemical characteristics phenocrysts (both native disaggregated crystal clots) andesitic dacitic lavas tephras can used develop models for spatial arrangement subcrustal magma systems their evolution over time. To do this, we use geochemical fingerprinting complex...
Research Article| November 01, 2005 Subduction erosion of the Jurassic Talkeetna-Bonanza arc and Mesozoic accretionary tectonics western North America Peter D. Clift; Clift 1School Geosciences, University Aberdeen, Aberdeen AB24 3UE, UK Search for other works by this author on: GSW Google Scholar Terry Pavlis; Pavlis 2Department Geology Geophysics, New Orleans, Louisiana 70148, USA Susan M. DeBari; DeBari 3Department Geology, Western Washington University, Bellingham, 98225, Amy E. Draut;...
The bulk compositions of two exposed sections intra-oceanic island arc crust (the Talkeetna volcanics and Border Ranges ultramafic-mafic complex in southeastern Alaska, the Canyon Mountain Complex northeastern Oregon) represent basalt (MgO = 11%) probably basaltic andesite 8%), respectively. Both have REE abundances approximately 10 times chondrite, with no LREE-enrichment. These compositions, determined by mass balance based on relative thicknesses lithologic units sections, are reasonable...
The Fiambaláa gabbroic intrusion is an Ordovician pluton, ∼30 km2 in outcrop area, situated the Sierras Pampeanas of NW Argentina. It was emplaced at a depth 21–24 km actively deforming continental magmatic are, and it represents some earliest are magmatism southern Cordillera. Its formation accompanied by emplacement voluminous sills dikes, synchronous with regional amphibolite facies metamorphism that locally upgraded to granulite along edges intrusion. has been tilted east now stands...
The Westcoast Crystalline Complex (WCC), Island Intrusions, and Bonanza Group of Vancouver Island, Canada, form three different crustal levels the Early to Middle Jurassic island arc. Differential uplift has exposed plutonic roots volcanic carapace arc for a strike length ~500 km, another 250 km on Queen Charlotte Islands. At deeper within arc, influx mantle-derived magmas was accompanied by metamorphism melting Wrangellian basement rocks, yielding heterogeneous WCC. Upward mobilization...
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 ∼50 km long Rosario segment of the Cretaceous Alisitos oceanic arc terrane provides undeformed three-dimensional exposures upper 7 an extensional arc, where crustal generation processes are recorded in both volcanic and underlying plutonic rocks. These exceptional allow for study physical chemical links between rock units help constrain differentiation active during growth evolution crust. This focuses on southern third segment, previously referred to as volcano-bounded basin,...
Miocene-Oligocene A-type granite intrudes the eastern side of Red Sea margin within zone extension from Jiddah, Saudi Arabia south to Yemen. The intrusions developed in early stages continental as began move slowly away Africa (around 30–20 Ma). Within narrow silicic magmas formed dikes, sills, small plutons and extrusive equivalents. In Jabal Tirf area these rocks occur an elongate consisting late Precambrian basement east, which is gradually invaded by mafic dikes. number dikes increases...
To better understand the role of slab melt in petrogenesis North Cascades magmas, this study focuses on high-Mg lavas from two northernmost active volcanoes Washington. High-Mg andesites (HMA) and basaltic (HMBA) Cascade Arc have high Mg# [molar Mg/(Mg+Fe2+)] relative to their SiO2 contents, elevated Nd/Yb, are Ni- Cr-enriched. The rock units examined here include Tarn Plateau HMBA (51.8–54.0 wt% SiO2, 68–70) Glacier Creek HMA (58.3–58.7 63–64) Mount Baker Volcanic Field, Lightning...