Index Catalog // ScholarsArchive@OSU

Determination of unsaturation-, growth phase-, and growth rate-dependent hydrogen isotopic fractionation in C₃₇ alkenones produced by Emiliania huxleyi

Creator:: Wolhowe, Matthew D.
Abstract:: Recent works have investigated use of the hydrogen isotopic composition of C₃₇ alkenones (δD[subscript K37s]), lipid biomarkers of certain haptophyte microalgae, as an independent paleosalinity proxy. I discuss herein the factors impeding such an application and identify the potential alternative use of δD[subscript K37s] measurements as a proxy for non-thermal,...
Resource Type:: Masters Thesis
Full Text:: huxleyi 1. Introduction 1.1 Background A primary goal of paleoceanography is to reconstruct ocean

Glacial to holocene watermass and continental weathering reconstructions from the Southeast Pacific

Creator:: Muratli, Jesse M.
Abstract:: Sediments of the central Chile margin record changes in ocean circulation and continental erosion associated with large–scale climate change. Here Antarctic– influenced Southern Ocean currents flow equatorward, forming a link between the high– and low–latitude oceans. Part of this link, Antarctic Intermediate Water, is an important conduit that ventilates South...
Resource Type:: Masters Thesis
Full Text:: . Paleoceanography 19. Galbraith, E. D., Kienast, M., Pedersen, T. F., and Calvert, S. E., 2004. Glacial

Deconvolving the sedimentary phases of barium using flow-through time-resolved analysis

Creator:: Hsieh, Chih-Ting
Abstract:: The distribution of barite (BaSO₄) in marine sediments has long been studied as a proxy for paleoproductivity. While pure barite is known to be a stable mineral in oxic sediments, it is also known that variations in the Sr/Ba ratio influence its solubility and liability during early diagenesis. To extract...
Resource Type:: Masters Thesis

Submarine plateau volcanism and Cretaceous Ocean Anoxic Event 1a : geochemical evidence from Aptian sedimentary sections

Creator:: Walczak, Paul S.
Abstract:: Marine sediments exceptionally rich in organic carbon, known as black shales, occur globally but intermittently in well correlated Cretaceous successions. The presence of black shales indicates that sporadic, ocean-wide interruption of normal respiration of marine organic matter during oxygen-deficient conditions has occurred. Submarine volcanism on a massive scale, related to...
Resource Type:: Masters Thesis

Hydrothermal links between ocean plateau formation and global anoxia at the Cenomanian-Turonian boundary

Creator:: Snow, Laura J.
Abstract:: The Cretaceous was a period of extreme climatic conditions accompanied by major perturbations in ocean-atmosphere biogeochemical cycles. One of the most intriguing features is the sporadic interruption of normal marine pelagic sediment deposition by organic rich sediments deposited during oxygen-deficient conditions (ocean anoxic events OAEs). A current model for the...
Resource Type:: Masters Thesis

Foraminiferal assemblages preserved in surface sediments correspond to multiple environmental and preservation variables

Creator:: Ross, Ann E. Morey
Abstract:: Here we investigate the relationships between modern foraminiferal assemblages from Atlantic and Pacific surface sediment samples and multiple environmental properties including water column and preservation variables using Canonical Correspondence Analysis (CCA). CCA finds two fauna] dimensions that are highly correlated to the environmental variables included in the analysis, and then...
Resource Type:: Masters Thesis

Exploring a fluorescence-based analytical method for Ba in natural waters and a field study of the major ion chemistry of Lake Issyk-Kul, Kyrgyzstan

Creator:: Qiu, Xuemei
Abstract:: Two separate research projects are described here. One involves development of a new analytical method for determination of Ba in seawater and other natural waters. The other is a collaborative field study of the chemistry of Lake Issyk-Kul, Kyrgyzstan. The method project explored an ion chromatography-fluorescence detection bench-top approach for...
Resource Type:: Masters Thesis

Late pleistocene changes in the Peru current based on planktonic foraminifera

Creator:: Feldberg, Melissa J.
Abstract:: Planktonic foraminiferal faunal assemblages were used to estimate sea-surface temperatures (SST) in the southeast Pacific Ocean during the Last Glacial Maximum (LGM) and off the coast of Peru over the last 150,000 years. Temperatures along the eastern boundary of South America were 6-8° C cooler during the LGM than at...
Resource Type:: Masters Thesis

Changing export production in the Eastern Equatorial Pacific, 160 ka to present

Creator:: Kish, Stacy W.
Abstract:: The increase in modern atmospheric CO₂ concentration (360 ppm) from pre-industrial levels (280 ppm) raises concern over the impact of anthropogenic carbon dioxide input on atmospheric chemistry. For this reason, it is important to understand the natural fluctuations of atmospheric carbon dioxide in the past. The Vostok ice core record...
Resource Type:: Masters Thesis

Contribution of cold seep barite to the barium geochemical budget of a marginal basin

Creator:: McQuay, Erica L.
Abstract:: Large barite (BaSO4) structures mark cold seeps in the southern San Clemente Basin. Barium flux to San Clemente sediments is two to three times greater than fluxes measured in surrounding California Borderland basins. Analyses of sediment trap material, water column samples, sediments and pore water indicate that expected bariumbearing mineral...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Determination of unsaturation-, growth phase-, and growth rate-dependent hydrogen isotopic fractionation in C₃₇ alkenones produced by Emiliania huxleyi

Glacial to holocene watermass and continental weathering reconstructions from the Southeast Pacific

Deconvolving the sedimentary phases of barium using flow-through time-resolved analysis

Submarine plateau volcanism and Cretaceous Ocean Anoxic Event 1a : geochemical evidence from Aptian sedimentary sections

Hydrothermal links between ocean plateau formation and global anoxia at the Cenomanian-Turonian boundary

Foraminiferal assemblages preserved in surface sediments correspond to multiple environmental and preservation variables

Exploring a fluorescence-based analytical method for Ba in natural waters and a field study of the major ion chemistry of Lake Issyk-Kul, Kyrgyzstan

Late pleistocene changes in the Peru current based on planktonic foraminifera

Changing export production in the Eastern Equatorial Pacific, 160 ka to present

Contribution of cold seep barite to the barium geochemical budget of a marginal basin

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