[HTML][HTML] Highly fractionated chromium isotopes in Mesoproterozoic-aged shales and atmospheric oxygen
The history of atmospheric oxygen through the Mesoproterozoic Era is uncertain, but may
have played a role in the timing of major evolutionary developments among eukaryotes …
have played a role in the timing of major evolutionary developments among eukaryotes …
Low Mid-Proterozoic atmospheric oxygen levels and the delayed rise of animals
NJ Planavsky, CT Reinhard, X Wang, D Thomson… - science, 2014 - science.org
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 …
Oxygenation of the mid-Proterozoic atmosphere: clues from chromium isotopes in carbonates
Chromium (Cr) isotopes in marine sedimentary rocks can be used as a sensitive proxy for
ancient atmospheric oxygen because Cr-isotope fractionation during terrestrial weathering …
ancient atmospheric oxygen because Cr-isotope fractionation during terrestrial weathering …
Sufficient oxygen for animal respiration 1,400 million years ago
S Zhang, X Wang, H Wang… - Proceedings of the …, 2016 - National Acad Sciences
The Mesoproterozoic Eon [1,600–1,000 million years ago (Ma)] is emerging as a key interval
in Earth history, with a unique geochemical history that might have influenced the course of …
in Earth history, with a unique geochemical history that might have influenced the course of …
Oxygenation of the Mesoproterozoic ocean and the evolution of complex eukaryotes
Abstract The Mesoproterozoic era (1,600–1,000 million years ago (Ma)) has long been
considered a period of relative environmental stasis, with persistently low levels of …
considered a period of relative environmental stasis, with persistently low levels of …
Extremely low oxygen concentration in mid-Proterozoic shallow seawaters
Abstract The mid-Proterozoic (1.8–0.8 Ga) witnessed the first appearance but unusually low
diversification of eukaryotes. The stagnant biotic evolution during this billion-year-long …
diversification of eukaryotes. The stagnant biotic evolution during this billion-year-long …
Pulsed oxygenation events drove progressive oxygenation of the early Mesoproterozoic ocean
The Mesoproterozoic era has long been considered a time of relative environmental and
biological stasis. However, emerging insight suggests that this period may have been more …
biological stasis. However, emerging insight suggests that this period may have been more …
Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes
Geochemical data,,, suggest that oxygenation of the Earth's atmosphere occurred in two
broad steps. The first rise in atmospheric oxygen is thought to have occurred between∼ …
broad steps. The first rise in atmospheric oxygen is thought to have occurred between∼ …
Black shale Mo isotope record reveals dynamic ocean redox during the Mesoproterozoic Era
Y Ye, S Zhang, H Wang, X Wang… - Geochemical …, 2021 - portal.findresearcher.sdu.dk
Eukaryotes reached ecological importance in the late Neoproterozoic Era, some one billion
years after their emergence. Their slow rise to prominence has been ascribed to prolonged …
years after their emergence. Their slow rise to prominence has been ascribed to prolonged …