Now showing items 1-10 of 133
Stable vanadium isotopes as a redox proxy in magmatic systems
(2016-10-26) - Journal article,
Recycling pathways of multivalent elements, that impact our understanding of diverse geological processes from ore formation to the rise of atmospheric oxygen, depend critically on the spatial and temporal variation of ...
Quantitative modeling of the rise in atmospheric oxygen
(University of Washington, 2008-08-01) - Other,
The abrupt rise of molecular oxygen in Earth’s atmosphere approximately 2.4 billion years ago was perhaps the most profound event in Earth’s history after the evolution of life itself. Biogeochemical cycles in Earth’s ...
Marine science : making waves
(2014-06) - Journal item,
Proterozoic onset of crustal reworking and collisional tectonics : Reappraisal of the zircon oxygen isotope record
(2014-05) - Journal article,
A global U-Pb and δO zircon database shows temporal changes in the magmatic record related to changes in the degree of crustal reworking. The δO composition of bulk sediment remains relatively constant through geologic ...
Volcanic cooling signal in tree ring temperature records for the past millennium
(2013-08-27) - Journal article,
Tree rings are an important proxy for understanding the timing and environmental consequences of volcanic eruptions as they are precisely dated at annual resolution and, particularly in tree line regions of the world, ...
Multiple Palaeoproterozoic carbon burial episodes and excursions
(2015-08-15) - Journal article,
Abstract Organic-rich rocks (averaging 2–5% total organic carbon) and positive carbonate-carbon isotope excursions ( δ 13C > + 5‰ and locally much higher, i.e. the Lomagundi-Jatuli Event) are hallmark features of ...
Hydrologic versus geomorphic drivers of trends in flood hazard
(2015-01-28) - Journal article,
Flooding is a major hazard to lives and infrastructure, but trends in flood hazard are poorly understood. The capacity of river channels to convey flood flows is typically assumed to be stationary, so changes in flood ...
Remote detection of past habitability at Mars-analogue hydrothermal alteration terrains using an ExoMars Panoramic Camera emulator
(2015-05-15) - Journal article,
A major scientific goal of the European Space Agency’s ExoMars 2018 rover is to identify evidence of life within the martian rock record. Key to this objective is the remote detection of geological substrates that are ...
Volcanogenic Fluvial-lacustrine environments in Iceland and their utility for identifying past habitability on Mars
(2015-02-16) - Journal article,
The search for once-habitable locations on Mars is increasingly focused on environments dominated by fluvial and lacustrine processes, such as those investigated by the Mars Science Laboratory Curiosity rover. The availability ...
Phosphate activation via reduced oxidation state phosphorus (P). Mild routes to condensed-P energy currency molecules
(2013-07-19) - Journal article,
The emergence of mechanisms for phosphorylating organic and inorganic molecules is a key step en route to the earliest living systems. At the heart of all contemporary biochemical systems reside reactive phosphorus (P) ...