A5023067440- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Paleontology and Stratigraphy of Fossils
- Hydrocarbon exploration and reservoir analysis
- Reservoir Engineering and Simulation Methods
- Geochemistry and Elemental Analysis
- Geological and Geochemical Analysis
- Drilling and Well Engineering
- Isotope Analysis in Ecology
- Geological formations and processes
- Radioactive element chemistry and processing
- Geological and Geophysical Studies
- Marine and coastal ecosystems
- Hydraulic Fracturing and Reservoir Analysis
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Seismic Imaging and Inversion Techniques
- Marine Biology and Ecology Research
- Geological Studies and Exploration
- Radioactive contamination and transfer
- Groundwater and Isotope Geochemistry
- Offshore Engineering and Technologies
- Fish biology, ecology, and behavior
- Neurobiology and Insect Physiology Research
- Microbial Community Ecology and Physiology
Woods Hole Oceanographic Institution
2019-2022
RWTH Aachen University
2022
Toyota Industries (United States)
2022
Amazon (United States)
2022
University of Manchester
2022
California University of Pennsylvania
2022
University of Milano-Bicocca
2022
Langley Research Center
2022
Ames Research Center
2022
Clausthal University of Technology
2022
Many chert sequences are located at key stratigraphic intervals or in structurally allochthonous packages, and because such provide critical information regarding the formation of sedimentary basins tectonic orogens it is important to determine precisely their original depositional position. Chemical methods delineating environments becoming increasingly sophisticated useful, part even slight post-depositional recrystallization may obscure primary rock textures. Most chemical criteria have...
Research Article| March 01, 1990 Rare earth elements as indicators of different marine depositional environments in chert and shale Richard W. Murray; Murray 1Department Geology Geophysics, University California, Berkeley,California 94720 Search for other works by this author on: GSW Google Scholar Marilyn R. Buchholtz ten Brink; Brink 2Earth Sciences Department, Lawrence Livermore National Laboratory, California 94550 David L. Jones; Jones C. Gerlach; Gerlach 3Nuclear Chemistry Division,...
Al/Ti and K/Al ratios in bulk sediment are used to interpret wind‐blown hemipelagic sources of deposition a 578 kyr record the Cariaco Basin, Venezuela (Ocean Drilling Program site 1002). Graphical cross‐spectral analyses indicate that these vary extremely closely with planktonic foraminiferal δ 18 O, both being significantly higher during interglacials lower glacials. indicates glacials sea level results relative basin isolation increases proportion kaolinite derived from local rivers...
We examined the flux of Al to sediment accumulating beneath zone elevated productivity in central equatorial Pacific Ocean, along a surface transect at 135°W as well downcore for 650 kyr record 1.3°N, 133.6°W. Across transect, pronounced, broadly equatorially symmetric increase accumulation is observed, relative Ti, with Al/Ti ratios reaching values 3–4 times that potential detrital sources. The profile parallels biogenic and modeled particulate 234 Th, suggesting rapid preferential...
Since Dymond et al. [1992] proposed the paleoproductivity algorithm based on “Bio‐Ba,” which relies a strong correlation between Ba and organic carbon fluxes in sediment traps, this proxy has been applied many studies. Barite, main carrier of particulate barium water column phase associated with export, also suggested as reliable some locations. We demonstrate that excess (total minus fraction terrigenous material) frequently overestimates barite (barium mineral barite), most likely due to...
ABSTRACT The ampullae of Lorenzini are sensitive to weak tactile stimulation applied the ends their jelly-filled tubes. Either an increase or a decrease in resting discharge frequency may be caused, each with opposite after-effect. ‘Adaptation’ is total, being three-quarters completed 3-8 sec. This ‘adaptation’ probably includes accommodative changes tissues. function discussed, but no definite conclusion can yet reached.
ABSTRACT The ampullae of Lorenzini are sensitive to weak electrical stimuli which presumably cause currents flow along the jelly-filled tubes sense organ. Increase resting frequency occurs when tube-opening is made negative capsule, and inhibition opening positive, with opposite after-effects in each case. Adaptation three-quarters complete about 5 sec. When stimulus applied as a voltage gradient water overlying ampullae, threshold for most units 1 μV./cm., represents current tube less than...
Abstract During International Ocean Discovery Program (IODP) expeditions, shipboard‐generated data provide the first insights into cored sequences. The natural gamma radiation (NGR) of recovered material, for example, is routinely measured on ocean drilling research vessel DV JOIDES Resolution . At present, only total NGR counts are readily available as shipboard data, although full spectra (counts a function gamma‐ray energy level) produced and archived. These contain unexploited...
Archaea have dominated oxic subseafloor communities for millions of years by minimizing energy loss.
In this characterization brief, report here comprehensive major and trace element analyses of over 45 sediment samples from Ocean Drilling Program Site 1149, located seaward the Izu‐Bonin trench. The combination these core with a complete set geochemical logging data enables us to calculate bulk composition sedimentary column subducting at Izu trench high accuracy (uncertainties ≤13%). has lower concentrations than global for most elements, due ∼50% dilution by biogenic material (∼45% opal...
ABSTRACT We use the carbon isotopic composition (δ 13 C) of dissolved inorganic (DIC) pore fluids from Leg 175 Ocean Drilling Program (ODP) along West African Margin to quantify rates methane production (methanogenesis) and destruction via oxidation (methanotrophy) in deep‐sea sediments. Results a model diffusion reaction sedimentary column show that anaerobic (AOM) occurs transition zone between presence sulfate methane, methanogenesis below these depths narrow confined ends at about 250 m...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn efficient electrocatalytic model cytochrome P-450 epoxidation cycleS. E. Creager, S. A. Raybuck, and R. W. MurrayCite this: J. Am. Chem. Soc. 1986, 108, 14, 4225–4227Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July 1986https://pubs.acs.org/doi/10.1021/ja00274a063https://doi.org/10.1021/ja00274a063research-articleACS PublicationsRequest reuse permissionsArticle...
Authigenic clay minerals formed on or in the seafloor occur every type of marine sediment. They are recognized to be a major sink many elements ocean but difficult study directly due dilution by detrital minerals. The extremely low dust fluxes and sedimentation rates South Pacific Gyre (SPG) provide unique opportunity examine relatively undiluted authigenic clay. Here, using Mg isotopes element concentrations combined with multivariate statistical modeling, we fingerprint quantify abundance...
We examine the 0–100 Ma paleoceanographic record retained in pelagic clay from South Pacific Gyre (SPG) by analyzing 47 major, trace, and rare earth elements bulk sediment 206 samples seven sites drilled during Integrated Ocean Drilling Program Expedition 329. use multivariate statistical analyses (Q-mode factor analysis multiple linear regression) of geochemical data to construct a model composition mass accumulation rates (MAR) six end-members, (post-Archean average Australian shale,...