Paleobiological perspectives on early eukaryotic evolution
AH Knoll - Cold Spring Harbor Perspectives in Biology, 2014 - cshperspectives.cshlp.org
Eukaryotic organisms radiated in Proterozoic oceans with oxygenated surface waters, but,
commonly, anoxia at depth. Exceptionally preserved fossils of red algae favor crown group …
commonly, anoxia at depth. Exceptionally preserved fossils of red algae favor crown group …
The ecological physiology of Earth's second oxygen revolution
Living animals display a variety of morphological, physiological, and biochemical characters
that enable them to live in low-oxygen environments. These features and the organisms that …
that enable them to live in low-oxygen environments. These features and the organisms that …
A shale-hosted Cr isotope record of low atmospheric oxygen during the Proterozoic
The emergence and expansion of animal life on Earth represents a dramatic shift in the
structure and complexity of the biosphere. A lack of firm constraints on surface oxygen levels …
structure and complexity of the biosphere. A lack of firm constraints on surface oxygen levels …
Uranium and molybdenum isotope evidence for an episode of widespread ocean oxygenation during the late Ediacaran Period
To improve estimates of the extent of ocean oxygenation during the late Ediacaran Period,
we measured the U and Mo isotope compositions of euxinic (anoxic and sulfidic) organic …
we measured the U and Mo isotope compositions of euxinic (anoxic and sulfidic) organic …
Diagenetic effects on uranium isotope fractionation in carbonate sediments from the Bahamas
Uranium isotope variations (δ 238 U) recorded in sedimentary carbonate rocks are a
promising new proxy for the extent of oceanic anoxia through geological time. However, the …
promising new proxy for the extent of oceanic anoxia through geological time. However, the …
A new estimate of detrital redox-sensitive metal concentrations and variability in fluxes to marine sediments
The enrichment and depletion of redox sensitive trace metals in marine sediments have
been used extensively as paleoredox proxies. The trace metals in shale are comprised of …
been used extensively as paleoredox proxies. The trace metals in shale are comprised of …
[HTML][HTML] The chromium isotopic composition of seawater and marine carbonates
P Bonnand, RH James, IJ Parkinson… - Earth and Planetary …, 2013 - Elsevier
Chromium isotopes are fractionated during redox reactions and have the potential to provide
a record of changes in the oxygenation levels of the oceans in the geological past. However …
a record of changes in the oxygenation levels of the oceans in the geological past. However …
Global variability of chromium isotopes in seawater demonstrated by Pacific, Atlantic, and Arctic Ocean samples
Seawater chromium (Cr) isotope and concentration data are presented from multiple sites in
the Arctic Ocean, and three locations in the Atlantic and Pacific Oceans. A 2400-m profile …
the Arctic Ocean, and three locations in the Atlantic and Pacific Oceans. A 2400-m profile …
Geochemistry of the Krivoy Rog Banded Iron Formation, Ukraine, and the impact of peak episodes of increased global magmatic activity on the trace element …
Abstract Pure Superior-type Banded Iron Formation (BIF) samples from the Krivoy Rog
Supergroup (Ukraine) are excellent archives of ambient Early Precambrian seawater. They …
Supergroup (Ukraine) are excellent archives of ambient Early Precambrian seawater. They …
Controls on the evolution of Ediacaran metazoan ecosystems: a redox perspective
A growing number of detailed geochemical studies of Ediacaran (635–541 Ma) marine
successions have provided snapshots into the redox environments that played host to the …
successions have provided snapshots into the redox environments that played host to the …