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Now showing items 21-29 of 29
An investigation into the characteristics and sources of light emission at deep-sea hydrothermal vents
(Massachusetts Institute of Technology, 2000)
A spectral camera (ALISS - Ambient Light Imaging and Spectral System) was used to image ambient light from high-temperature vents at 9°N East Pacific Rise and the Juan de Fuca Ridge during 1997 and 1998 Alvin dive cruises. ...
Fine-grained sedimentation on the Chenier Plain Coast and inner continental shelf, northern Gulf of Mexico
(Massachusetts Institute of Technology, 2003)
This thesis examines the evolution of a mud-dominated coastal sedimentary system on multiple time scales. Fine-grained systems exhibit different properties and behavior from sandy coasts, and have received relatively little ...
Oceanic lithosphere magnetization : marine magnetic investigations of crustal accretion and tectonic processes in mid-ocean ridge environments
(Massachusetts Institute of Technology, 2007)
The origin of symmetric alternating magnetic polarity stripes on the seafloor is investigated in two marine environments; along the ridge axis of the fast spreading East Pacific Rise (EPR) (90 25'-90 55'N) and at Kane ...
Kinetic processes of mantle minerals
(Massachusetts Institute of Technology, 2000)
This dissertation discusses the experimental results designed to constrain the processes of MORB generation. The main focus of this study is to investigate the location and the related processes of the transformation ...
Molecular and isotopic records of the combustion inputs to the environment over the last 250 yrs
(Massachusetts Institute of Technology, 2004)
The most ubiquitous source of polycyclic aromatic hydrocarbons (PAHs) to the environment is incomplete combustion. This study generated a high-resolution historical record of pyrogenic PAH emissions since pre-industrial ...
The marine geochemistry of iron and iron isotopes
(Massachusetts Institute of Technology, 2004)
This thesis addressed questions about the Fe cycle by measuring detailed profiles and transects of Fe species in the ocean and also by exploring the use of a new tracer of Fe, Fe isotopic fractionation. In the subtropical ...
Antarctic glacial chronology : new constraints from surface exposure dating
(Massachusetts Institute of Technology, 2000)
The dynamics of oceanic transform faults : constraints from geophysical, geochemical, and geodynamical modeling
(Massachusetts Institute of Technology, 2008)
Segmentation and crustal accretion at oceanic transform fault systems are investigated through a combination of geophysical data analysis and geodynamical and geochemical modeling. Chapter 1 examines the effect of fault ...
Geomicrobiology of the ocean crust : the phylogenetic diversity, abundance, and distribution of microbial communities inhabiting basalt and implications for rock alteration processes
(Massachusetts Institute of Technology, 2007)
Basaltic ocean crust has the potential to host one of the largest endolithic communities on Earth. This portion of the biosphere, however, remains largely unexplored. In this study, we utilize molecular biological, ...