In Han et al. 2024 (open access in Earth and Planetary Science Letters!), Shujun leads the way as we dive deeper into what we can learn from the geochemistry of the Doushantou Formation, and the spatial extent of the lagoon in which it was deposited. Expect more stunning images from the scanning electron microscope and lots of discussion of the importance of clay minerals. Continue reading Geochemistry & Life: Part 2
In our Frontiers In paper led by Shujun Han, we present results demonstrating that SEM-EDS can produce reliable quantitative mineralogy … Continue reading Earth Science Applications of Mineral Mapping
In the first post looking at Han et al. (2022) (What is in the sediments?), I mention that the location … Continue reading Matching Methods
Quickly dismissed as ‘mud’ by many, the sediments at the seafloor are critical to ocean biogeochemistry. They act as a … Continue reading What is in the sediments?
In Du et al. 2022, we used a reactive-transport model to demonstrate the roles of authigenic phosphates, Fe-Mn oxides, clay … Continue reading New Model Results: The Bigger Picture
Back to the rare earth elements (REE) for today’s post, with a particular focus on Neodymium (Nd). One of the … Continue reading What do the models say?
In our latest paper, PhD student Shujun Han uses high resolution images of the clay mineral saponite to determine that the early animal life preserved in the Doushantou Formation emerged into a restricted lagoonal environment. Continue reading Geochemistry and Life: Emergence of Early Animals from a Lagoon?
at least to a degree determining the authigenic signature as both sites demonstrate coupled shifts in authigenic and detrital neodymium isotope records (fit within the range set by the global compilation) and those shifts align with changes in sediment composition either through scenario 2 (neodymium released from the sediments alters the bottom water via a ‘benthic flux’ or scenario 3 (neodymium of the authigenic phases is controlled by the detrital sediments). Continue reading Circulation or Sedimentation? P3
As I mentioned in part 1, I was curious about how widespread and how tight the correlation between authigenic (formed … Continue reading Circulation or Sedimentation? P2
Part 1: Neodymium Isotopes Primer and Project Background In our most recent publication (read it here! *This should be free … Continue reading Circulation or Sedimentation? P1
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