This study examines redox conditions in the Panthalassa Ocean at the Smithian-Spathian boundary 3 million years after the end-Permian mass extinction by analyzing trace element geochemistry and pyrite morphology in carbonate rocks from the Jesmond Formation. Previous studies of shallow coastal seas show evidence of ocean anoxia and warming at this time, but the open ocean was likely more oxygenated. Analysis of samples from the Jesmond Formation suggests primarily oxic conditions in the Panthalassa Ocean with no evidence of widespread anoxia, indicating the ocean was recovering while coastal areas remained more stressed. Further study of Panthalassa formations is needed to better understand global environmental conditions after the end-Permian extinction.
S Pillay, Dr. A. J. Smit, Dr Deborah Robertson-Andersson. Submitted to the ninth Scientific Symposium of the Western Indian Ocean Marine Science (WIOMSA) 2015.
S Pillay, Dr. A. J. Smit, Dr Deborah Robertson-Andersson. Submitted to the ninth Scientific Symposium of the Western Indian Ocean Marine Science (WIOMSA) 2015.
Pol Tarrats presentation on Sefs9 - Geneva 2015
CLAM project - Global Change in Mountain Lakes
"Study and understand the present to explain the past"
ABSTRACT: Grab samples from Enol Lake (1080 m.a.s.l., Picos de Europa National Park, Spain) were collected to evaluate the chironomid community composition, structure and spatial and temporal variability. We obtained 3 replicate samples at 4, 8, 12, 16 and 20 m water depth four times per year (May, July, September and November) in two consecutive years (2013 and 2014), with a total of 120 samples analyzed. A total of 19 taxa were identified, although the dominant taxa in all samples were Paratanytarsus, Chironomus, Tanytarsus and Procladius choreus. Chironomusand Stictochironomus taxa abundance increased with depth while the more abundant taxa in the littoral were Paratanytarsus,Endochironomus and Corynoneura. Seasonal changes concern many chironomid taxa, although it is more relevant in the case ofCorynoneura, Tanytarsus and Procladius. Spatial changes are mostly related to the presence of macrophytes and algae, especially Chara, as chironomid composition and abundance are very different in samples from macrophyte-rich and poor areas.
Pol Tarrats presentation on Sefs9 - Geneva 2015
CLAM project - Global Change in Mountain Lakes
"Study and understand the present to explain the past"
ABSTRACT: Grab samples from Enol Lake (1080 m.a.s.l., Picos de Europa National Park, Spain) were collected to evaluate the chironomid community composition, structure and spatial and temporal variability. We obtained 3 replicate samples at 4, 8, 12, 16 and 20 m water depth four times per year (May, July, September and November) in two consecutive years (2013 and 2014), with a total of 120 samples analyzed. A total of 19 taxa were identified, although the dominant taxa in all samples were Paratanytarsus, Chironomus, Tanytarsus and Procladius choreus. Chironomusand Stictochironomus taxa abundance increased with depth while the more abundant taxa in the littoral were Paratanytarsus,Endochironomus and Corynoneura. Seasonal changes concern many chironomid taxa, although it is more relevant in the case ofCorynoneura, Tanytarsus and Procladius. Spatial changes are mostly related to the presence of macrophytes and algae, especially Chara, as chironomid composition and abundance are very different in samples from macrophyte-rich and poor areas.
Chemical Oceanography is fundamentally interdisciplinary. The chemistry of the ocean is closely tied to ocean circulation, climate, the plants and animals that live in the ocean, and the exchange of material with the atmosphere, cryosphere, continents, and mantle
Ecotoxicity & Risk Assessment of Mercury in the Grand Bay National Estuarine Research Reserve:
Profiling Mercury Distribution in the NERR by Cold Vapor Atomic Absorption Spectrometery
The oceans are getting acidified! How? Why? What can we do?
For answers... Check the Presentation out
(Just a bit more informative than my previous one)
Nourishment and Nursery Habitats: Dietary and Habitat-Use Biomarkers in the Saltmarsh
Created by Kathryn Brinegar @ University of North Carolina at Charlotte
AGU 2012 Conference, San Francisco, CA
Student Oral Presenter
• Presented at the American Geophysical Union (AGU) on “Validating Annual Growth Bands of Deep Sea
Corals from the Gulf of Mexico and Southeastern United States”.
Badlands National Park Isotopic Record of Climate Change Across the Eocene-Ol...Michelle Mullin
A stable isotopic record was obtained from paleosols in the Badlands National Park across the Chadronian-Orellan NALMA (Eocene-Oligocene). Results indicate a decoupling of the terrestrial and marine responses to global climate change. Tectonic forces and micro-climate regimes appear to have a strong influencing role in the mid-continent. This presentation represents the Defense for the degree of Master of Science in Geology, November 10, 2010.
1. Redox Conditions in the Panthalassa Ocean at the Smithian-Spathian Boundary
Christian Olsen1, Alan Stebbins2, Robyn Hannigan2
1Earth and Environmental Studies, Montclair State University, 2School for the Environment, University of Massachusetts Boston
• Permian-Triassic Extinction1:
• Global warming
• Ocean acidification
• Ocean anoxia and euxinia
• Similar issues today
• 90% marine species extinct
• Smithian-Spathian Boundary1:
• 3 Million years after P-T
extinction
• Global cooling
• Potential for increased
oxygen availability
Introduction Problem & Hypothesis Statement
Problem:
Previous studies on the Sm-Sp boundary have focused on shallow marine
sediments1,2. The problem with these studies is that they examine shallow
coastal seas which are heavily influenced by runoff, isolation from ocean
currents and generally have lower dissolved oxygen levels and higher
temperatures than the open ocean.
Hypothesis:
Since the Jesmond Formation is in the Panthalassa open ocean we expect to
see more of a global signal recorded in the rock record. At Jesmond we expect
to see long-term oxic conditions with rare anoxic events.
Materials & Methods
• Trace element extraction4:
• Measure
• Acetic acid digestion
• ICP-MS measure trace
elements
• Pyrite Morphology2:
• SEM surveys
• No pyrite (oxic)
• Euhedral (oxic➟dysoxic)
• Framboidal (dysoxic➟ euxinic)
• Trace element proxies:
• Ce anomaly (Ce/Ce* < 1 oxic)
• Th/U (Th/U < 1 oxic)
Seawater Signatures and Contamination
• Seawater signatures5:
•Y/Ho > 36
•YbPAAS/NdPAAS > 1
•ΣREE ≈ 0.278
• Non-seawater signatures tend to contain higher whole rock Al contents.
• Non-seawater signatures generally preserve similar redox results except
for Th/U
Trends and Results
Redox Proxy Trend Notes
Th/U Oxic to suboxic Enriched samples may not reflect seawater chemistry
Pyrite Oxic to suboxic Lack of framboidal pyrite suggests no anoxic events
Ce/Ce* Oxic to suboxic Clearest redox trend
Redox Proxies Results
• Suggest primarily oxic conditions
• No large Ce anomaly and absence of framboidal pyrite
suggests no anoxic events
Discussion and Conclusion
Our data shows a healthy open ocean with oxic conditions suggesting that
dysoxic and anoxic redox conditions in shallow seas are localized to those
environments while the overall marine environment is recovering
Majority of marine biodiversity are coastal organisms and species diversity
would not fully recover until mid-Triassic7
Global warming and hot temperatures could lead to more dysoxic events in
the isolated Paleo-Tethys with the larger Panthalssa oceans being more
oxygenated11
More geochemical research is needed on the Jesmond section and
surviving Panthalassa ocean formations to piece together Sm-Sp
environmental conditions and global trends
Jesmond Formation Data and Shallow Sea Studies
Shallow seas data1,2 Jesmond
Redox conditions: oxic➟anoxic, rare euxinia Oxic➟suboxic
Temperature: Hot then cooling after the
Sm-Sp boundary
Suboxia at Sm-Sp possibly
due to extreme heat
Overall trends: Anoxic events at the
boundary
Oxic to suboxic conditions,
overall healthy ocean
Study Area: Jesmond Formation, a carbonate platform in the
Panthalassa Ocean currently located in British Columbia3.
Euhedral pyrite forms in anoxic sediment porewaters. Left and middle images are euhedral pyrites under
5 μm. Right image is framboidal pyrite. We did not find framboids in the Jesmond samples.
• We determined three trace element patterns to establish whether a sample
is likely to have preserved seawater signatures and thus redox chemistry
• Samples with non-seawater like signatures are less likely to preserve
accurate redox proxies
• We organized samples into confidence levels as shown
• Preserved seawater signatures (green)
• Moderately preserved seawater signatures (yellow)
• Little or no preserved seawater signatures (red)
“Princess” our ICP-MS on which we ran our acid
digested samples to extract trace element
concentrations.
Panthalassa
Ocean
Paleo-tethys
Ocean
Neo-tethys
Ocean
oxic oxic oxic
Sample Y/Ho Ybpaas/Ndpaas ΣREE Confidence
16-9 50.52 1.20 0.34 seawater signiture
9-14 44.29 0.84 0.35 some seawater signiture
17-2 35.00 0.78 0.55 little to no seawater signiture
[1] Zhang, L., et al 2015. Biogeosciences, 12(5), 1597-1613. [2] Sun, Y. D., et al. 2015.
Palaeogeography, Palaeoclimatology, Palaeoecology, 427, 62-78. [3] Johnston, S. T., & Borel, G.
D. 2007. Earth and Planetary Science Letters, 253(3), 415-428. [4 ]Nothdurft, L. D., et al., 2004.
Geochimica et Cosmochimica Acta, 68(2), 263-283. [5] Tostevin, R., et al., 2016. Chemical
Geology, 438, 146-162.
Acknowledgements and References
• Hannigan Lab Group and Dr. Tom Algeo for providing samples
• Environmental Analytical Facility (NSF Award # 09-42371)
• NSF for funding the CREST REU program
Scanning Eelctron Microscope
used to determine pyrite
morphology.