Now showing items 61-70 of 70
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, ...
Helium and lead isotope geochemistry of oceanic volcanic rocks from the East Pacific and South Atlantic
(Massachusetts Institute of Technology, 1987)
The isotopic evolution of helium and lead in the Earth is coupled by virtue of their common radioactive parents uranium and thorium. The isotopic signatures in oceanic volcanic rocks provide constraints on the temporal ...
Age of air and the circulation of the stratosphere
(Massachusetts Institute of Technology, 2017)
The circulation of air in the stratosphere is important for the distribution of radiatively-important trace gases, such as ozone and water vapor, and other chemical species, including ozone-depleting chlorofluorocarbons. ...
An inverse approach to understanding benthic oxygen isotope records from the last deglaciation
(Massachusetts Institute of Technology, 2014)
Observations suggest that during the last deglaciation (roughly 20,000-10,000 years ago) the Earth warmed substantially, global sea level rose approximately 100 meters in response to melting ice sheets and glaciers, and ...
The gravity field and plate boundaries in Venezuela
(Massachusetts Institute of Technology, 1972)
Free-air and simple Bouguer anomaly maps of the Venezuelan continental margin (from 60°W to 72°W and from 7°N to 13°N) are presented. The major features of the free-air map are: the large lows associated with the deep ...
Analysis and interpretation of tidal currents in the coastal boundary layer
(Massachusetts Institute of Technology, 1979)
Concern with the impact of human activities on the coastal region of the world's oceans has elicited interest in the so-called "coastal boundary layer"-that band of water adjacent to the coast where ocean currents adjust ...
Vertical flux, ecology and dissolution of radiolaria in tropical oceans : implications for the silica cycle
(Massachusetts Institute of Technology, 1982)
Radiolarians which settle through the oceanic water column were recovered from three stations (western Tropical Atlantic-Station E, central Tropical Pacific-P1 and Panama Basin-PB) using PARFLUX sediment traps in moored ...
A study of certain trace metals in sea water using anodic stripping voltammetry
(Massachusetts Institute of Technology, 1970)
Anodic stripping voltammetry utilizing a thin film mercury composite graphite electrode has been evaluated and applied for the direct analysis of the metals, Zn,J Cu, Pb, and Cd in sea water. The electrode was observed to ...