Trace elements at the intersection of marine biological and geochemical evolution
Life requires a wide variety of bioessential trace elements to act as structural components
and reactive centers in metalloenzymes. These requirements differ between organisms and …
and reactive centers in metalloenzymes. These requirements differ between organisms and …
Bioactive trace metals and their isotopes as paleoproductivity proxies: An assessment using GEOTRACES‐era data
Phytoplankton productivity and export sequester climatically significant quantities of
atmospheric carbon dioxide as particulate organic carbon through a suite of processes …
atmospheric carbon dioxide as particulate organic carbon through a suite of processes …
Low Mid-Proterozoic atmospheric oxygen levels and the delayed rise of animals
The oxygenation of Earth's surface fundamentally altered global biogeochemical cycles and
ultimately paved the way for the rise of metazoans at the end of the Proterozoic. However …
ultimately paved the way for the rise of metazoans at the end of the Proterozoic. However …
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 …
[PDF][PDF] Controls on trace metal authigenic enrichment in reducing sediments: insights from modern oxygen-deficient settings
Any effort to reconstruct Earth history using variations in authigenic enrichments of redox-
sensitive and biogeochemically important trace metals must rest on a fundamental …
sensitive and biogeochemically important trace metals must rest on a fundamental …
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 …
Correlated molybdenum and uranium isotope signatures in modern anoxic sediments: Implications for their use as paleo-redox proxy
Redox-sensitive trace metals and their isotopes have emerged as important tools that are
used to reconstruct the redox-evolution of the ocean-atmosphere system. However …
used to reconstruct the redox-evolution of the ocean-atmosphere system. 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 …
Response of the Cr isotope proxy to Cretaceous Ocean Anoxic Event 2 in a pelagic carbonate succession from the Western Interior Seaway
Chromium offers a redox sensitive isotopic proxy with potential for tracing past oxygen levels
in the oceans. We explore this potential in a pelagic succession of marine carbonate …
in the oceans. We explore this potential in a pelagic succession of marine carbonate …
Chromium isotope geochemistry
L Qin, X Wang - Reviews in Mineralogy and …, 2017 - pubs.geoscienceworld.org
Chromium consists of four stable isotopes (50 Cr, 52 Cr, 53 Cr and 54 Cr) with natural
abundances of 4.35%, 83.79%, 9.50% and 2.36%, respectively (Rossman and Taylor 1998) …
abundances of 4.35%, 83.79%, 9.50% and 2.36%, respectively (Rossman and Taylor 1998) …