A5074158740- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Astro and Planetary Science
- Geological and Geophysical Studies
- Paleontology and Stratigraphy of Fossils
- Seismic Imaging and Inversion Techniques
- Geological Modeling and Analysis
- Astronomical Observations and Instrumentation
- Planetary Science and Exploration
- Hydrocarbon exploration and reservoir analysis
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Isotope Analysis in Ecology
- Geological and Geochemical Analysis
- Solar and Space Plasma Dynamics
- Spacecraft and Cryogenic Technologies
- Geological formations and processes
- Reservoir Engineering and Simulation Methods
- Scientific Research and Discoveries
- earthquake and tectonic studies
- Nuclear Physics and Applications
- Marine Biology and Ecology Research
- Marine and environmental studies
- Calcium Carbonate Crystallization and Inhibition
- Geochemistry and Geologic Mapping
University of Utah
2023-2025
Utah State University
2025
International Ocean Discovery Program
2019-2023
University of California, Santa Cruz
2014-2022
University of Kansas
2019-2022
University of New Caledonia
2019
Expedition (United Kingdom)
2019
Ministry of Agriculture and Forestry and Food
2019
Taranaki Base Hospital
2019
Texas A&M University
1982
The geological record encodes the relationship between climate and atmospheric carbon dioxide (CO 2 ) over long short timescales, as well potential drivers of evolutionary transitions. However, reconstructing CO beyond direct measurements requires use paleoproxies herein lies challenge, proxies differ in their assumptions, degree understanding, even reconstructed values. In this study, we critically evaluated, categorized, integrated available to create a high-fidelity transparently...
Abstract Data from International Ocean Discovery Program (IODP) Expedition 371 reveal vertical movements of 1–3 km in northern Zealandia during early Cenozoic subduction initiation the western Pacific Ocean. Lord Howe Rise rose deep (∼1 km) water to sea level and subsided back, with peak uplift at 50 Ma north between 41 32 south. The New Caledonia Trough 2–3 55 45 Ma. We suggest these elevation changes resulted crust delamination mantle flow that led slab formation. propose a “subduction...
Abstract The Palaeocene–Eocene Thermal Maximum (PETM) was a global warming event of 5–6 °C around 56 million years ago caused by input carbon into the ocean and atmosphere. Hydrothermal venting greenhouse gases produced in contact aureoles surrounding magmatic intrusions North Atlantic Igneous Province have been proposed to play key role PETM carbon-cycle perturbation, but precise timing, magnitude climatic impact such remains uncertain. Here we present seismic data results five-borehole...
Abstract Eocene Thermal Maximum 2 (ETM‐2; 54.1 Ma) was the second largest hyperthermal. Like Paleocene‐Eocene (PETM), ETM‐2 characterized by massive carbon emissions and several degrees of global warming thus can serve as a case study for assessing impacts rapid CO on ocean carbonate chemistry, biota, climate. Marine records are better preserved than those PETM due to more subdued dissolution. As yet, however, magnitude this cycle perturbation has not been well constrained. Here, we present...
Abstract. The International Ocean Discovery Program (IODP) Expedition 396 to the mid-Norwegian margin recovered > 1300 m of pristinely preserved, volcanic-ash-rich sediments deposited during late Paleocene and early Eocene from close centre North Atlantic Igneous Province (NAIP). Remarkably, many these cores contain glendonites, pseudomorphs after purported cold-water mineral ikaite, dated Eocene. These time intervals span some hottest climates Cenozoic, including Paleocene–Eocene Thermal...
Abstract The Paleocene‐Eocene Thermal Maximum (PETM, ∼56 million years ago) is among the best‐studied climatic warming events in Earth history and often compared to projected anthropogenic climate change. PETM characterized by a rapid negative carbon isotope excursion global temperature increase of 4–5°C, accompanied changes spatial patterns evaporation precipitation hydrologic cycle. Recent model reconstructions suggest regionally complex non‐linear response one important aspect hydrology:...
North Atlantic Deep Water (NADW) currently redistributes heat and salt between Earth's ocean basins, plays a vital role in the ocean-atmosphere CO2 exchange. Despite its crucial today's climate system, vigorous debate remains as to when deep-water formation started. Here, we present datasets from carbonate-rich middle Eocene sediments Newfoundland Ridge, revealing unique archive of paleoceanographic change progressively cooling Eocene. Well-defined lithologic alternations calcareous ooze...
Research Article| December 20, 2017 Subtropical sea-surface warming and increased salinity during Eocene Thermal Maximum 2 Dustin T. Harper; Harper 1Department of Earth Planetary Sciences, University California–Santa Cruz, 1156 High Street, Santa California 95064, USA Search for other works by this author on: GSW Google Scholar Richard Zeebe; Zeebe 2School Ocean Science Technology, Hawaii at Manoa,1000 Pope Road, MSB 507, Honolulu, 96822, Bärbel Hönisch; Hönisch 3Department Environmental...
Abstract Sediment mass accumulation rate (MAR) is a proxy for paleoceanographic conditions, especially if biological productivity generated most of the sediment. We determine MAR records from pelagic calcareous sediments in Tasman Sea based on analysis 11 boreholes and >3 million seismic reflection horizon picks. Seismic data regions 10,000–30,000 km 2 around each borehole were analyzed using International Ocean Discovery Program Expedition 371 other boreholes. Local was affected by...
Abstract Several studies indicate that North Atlantic Deep Water (NADW) formation might have initiated during the globally warm Eocene (56–34 Ma). However, constraints on surface ocean conditions in source regions presently conducive to deep water are sparse. Here we test whether of middle Labrador Sea allowed for by applying (organic) geochemical and palynological techniques, sediments from Ocean Drilling Program (ODP) Site 647. We reconstruct a long‐term sea temperature (SST) drop ~30°C...
The late Paleocene and early Eocene (LPEE) are characterized by long-term (million years, Myr) global warming transient, abrupt (kiloyears, kyr) events, termed hyperthermals. Although both have been attributed to greenhouse (CO 2 ) forcing, the longer-term trend in climate was likely influenced additional forcing factors (i.e., tectonics) extent which driven atmospheric CO remains unclear. Here, we use a suite of new existing observations from planktic foraminifera collected at Pacific Ocean...
The early Paleogene represents the most recent interval in Earth's history characterized by global greenhouse warmth on multi-million year timescales, yet our understanding of long-term climate and carbon cycle evolution low latitudes, particular Indian Ocean, remains very poorly constrained. Here we present first sub-eccentricity-resolution stable isotope (δ13C δ18O) trace element (Mg/Ca B/Ca) records spanning late Paleocene–early Eocene (∼58–53 Ma) across a surface–deep hydrographic...
Abstract While basaltic volcanism is dominant during rifting and continental breakup, felsic magmatism may be a significant component of some rift margins. During International Ocean Discovery Program (IODP) Expedition 396 on the margin Norway, graphite‐garnet‐cordierite bearing dacitic unit (the Mimir dacite) was recovered in two holes within early Eocene sediments High (Site U1570), marginal high Vøring Transform Margin. Here, we present comprehensive textural, petrological, geochemical...