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Hotspots and Mantle Plumes' Some Phenomenology
- N. Sleep
- Environmental Science, Geology
- 10 May 1990
The available data, mainly topography, geoid, and heat flow, describing hotspots worldwide are examined to constrain the mechanisms for swell uplift and to obtain fluxes and excess temperatures of…
The habitat and nature of early life
It is possible that early life diversified near hydrothermal vents, but hypotheses that life first occupied other pre-bottleneck habitats are tenable (including transfer from Mars on ejecta from impacts there).
Isostasy and Flexure of the Lithosphere
- N. Sleep
- 1 October 2002
Preface Acknowledgments Notation 1. Historical development of the concept of isostasy 2. Isostasy and flexure of the lithosphere 3. Theory of elastic plates 4. Geological examples of the flexure…
Carbon dioxide cycling and implications for climate on ancient Earth
The crustal Urey cycle of CO2 involving silicate weathering and metamorphism acts as a dynamic climate buffer. In this cycle, warmer temperatures speed silicate weathering and carbonate formation,…
Cenozoic magmatism throughout east Africa resulting from impact of a single plume
The geology of northern and central Africa is characterized by broad plateaux, narrower swells and volcanism occurring from ∼45 Myr ago to the present. The greatest magma volumes occur on the…
Annihilation of ecosystems by large asteroid impacts on the early Earth
The Earth may have been continuously habitable by ecosystems that did not depend on photosynthesis as early as 4.44 Gyr BP (before present), but only a brief interval after 3.8 Gyr exists between the time when obligate photosynthetic organisms could continuously evolve and thetime when the palaeontological record indicates highly evolved photosynthetics ecosystems.
Habitable zone limits for dry planets.
It is shown that "land planets" (desert worlds with limited surface water) have wider habitable zones than aqua planets, and it is possible that Venus was a habitable land planet as recently as 1 billion years ago.
Emergence of a Habitable Planet
Abstract We address the first several hundred million years of Earth’s history. The Moon-forming impact left Earth enveloped in a hot silicate atmosphere that cooled and condensed over ∼1,000 yrs. As…
H2-rich fluids from serpentinization: geochemical and biotic implications.
- N. Sleep, A. Meibom, T. Fridriksson, R. Coleman, D. Bird
- GeologyProceedings of the National Academy of Sciences…
- 31 August 2004
The catalytic properties of FeNi3 allow complex organic compounds to form within serpentinite and, when mixed with atmospherically produced complex organic matter and waters that circulated through basalts, constitutes an attractive prebiotic substrate.
No climate paradox under the faint early Sun
It is hypothesized that a lower albedo on the Earth, owing to considerably less continental area and to the lack of biologically induced cloud condensation nuclei, made an important contribution to moderating surface temperature in the Archaean eon, thus alleviating the need for extreme greenhouse-gas concentrations to satisfy the faint early Sun paradox.