10.6084/m9.figshare.3453770.v1
Ashleigh V. S. Hood
Ashleigh V. S.
Hood
Malcolm W. Wallace
Malcolm W.
Wallace
Marine cements reveal the structure of an anoxic, ferruginous Neoproterozoic ocean
Geological Society of London
2016
Cryogenian Oodnaminta Reef Complex
chemical
marine cements
anoxic
geochemical
ferruginous Neoproterozoic ocean Neoproterozoic oceans
Geology
2016-06-21 11:40:25
Dataset
https://geolsoc.figshare.com/articles/dataset/Marine_cements_reveal_the_structure_of_an_anoxic_ferruginous_Neoproterozoic_ocean/3453770
<p>Neoproterozoic oceans provided the setting for the rise of animals, yet little is known of their chemical composition. Marine
carbonates from the Cryogenian Oodnaminta Reef Complex, South Australia, reveal the chemical structure of a Neoproterozoic
ocean. Pseudo-depth profiles from shallow- to deep-water reef facies have been constructed from geochemical and sedimentological
analysis of marine cements. Evidence suggests that under a peritidal oxic–anoxic chemocline, the water column was largely
anoxic, strongly ferruginous and had a chemistry profoundly different from that of modern seawater. These geochemical data
suggest early Archaean-like conditions for this late Cryogenian ocean, posing problems for metazoan evolution in extremely
anoxic conditions.
</p>