PP53F:
Evolution of the Marine Silica Cycle Posters


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Session ID#: 49730

Session Description:
Silica dissolved in seawater (DSi, primarily derived from silicate weathering) is converted by biosilicifiers to opal and buried in sediments. Today, low [DSi] reflects its efficient uptake by pelagic silicifiers, principally diatoms. However, the marine Si-cycle may have functioned quite differently in the geologic past. First, the organisms that mediate the Si-cycle only proliferated relatively recently (the mid-Cenozoic, for diatoms), allowing potentially much higher DSi prior to their advent. Second, the DSi input from weathering (which links the Si-cycle to paleoclimate and the carbon cycle via the silicate weathering "thermostat") likely varied over time. Such variations likely occurred with both long-term climatic trends and geologically abrupt climate/carbon-cycle perturbations, including Paleogene hyperthermal events and Phanerozoic mass extinctions. We seek contributions that explore a dynamic Si-cycle over geologic time (particularly Phanerozoic timescales) with modeling and observations constraining the evolution and impact of silicifiers, and connections to paleoclimate and other biogeochemical cycles.
Primary Convener:  Donald E Penman, Yale University, Department of Earth and Planetary Sciences, New Haven, CT, United States
Conveners:  Pincelli M Hull, Yale University, Department of Earth & Planetary Sciences, New Haven, CT, United States, Andy Ridgwell, University of California Riverside, Riverside, CA, United States and Katharine R Hendry, University of Bristol, Bristol, United Kingdom
Primary Liaison:  Donald E Penman, Yale University, Department of Earth and Planetary Sciences, New Haven, CT, United States
Chairs:  Donald E Penman, University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, United States and Pincelli M Hull, Yale University, Department of Earth & Planetary Sciences, New Haven, CT, United States
OSPA Liaison:  Donald E Penman, University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, United States

Cross-Listed:
  • B - Biogeosciences
  • OS - Ocean Sciences
Index Terms:

0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0473 Paleoclimatology and paleoceanography [BIOGEOSCIENCES]
1050 Marine geochemistry [GEOCHEMISTRY]
4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]

Abstracts Submitted to this Session:

Constraining marine Si cycle and bedded chert formation in the Ediacaran-Cambrian transition (550-521 Ma) (363710)
Chenqing Li1, Lin Dong2 and Bing Shen1, (1)Peking University, Beijing, China, (2)Peking University, Earth and Space Sciences, Beijing, China
Glacial-interglacial reorganisation of the deep ocean silicon distribution (366563)
Matthew Dumont, Raja Ganeshram and Laetitia E Pichevin, University of Edinburgh, School of Geosciences, Edinburgh, United Kingdom
Configuration of the cGENIE Model with Marine Biogeochemical Silicon Cycling (405217)
Rhiannon Jones1, Katharine R Hendry1, Jamie D Wilson1,2, Ros Death1,2 and Andy Ridgwell3,4, (1)University of Bristol, Bristol, United Kingdom, (2)University of Bristol, School of Geographical Sciences, Bristol, United Kingdom, (3)University of Bristol, School of Earth Sciences, Bristol, United Kingdom, (4)University of California, Riverside, Department of Earth Sciences, Riverside, United States
Positive Shift in Radiolarian Test Size Across the PETM at Mead Stream, New Zealand (414231)
Sophie Westacott1, Christopher John Hollis2, Kristina M. Pascher2 and Pincelli M Hull3, (1)Yale University, Department of Earth & Planetary Sciences, New Haven, United States, (2)GNS Science, Lower Hutt, New Zealand, (3)Yale University, Department of Earth & Planetary Sciences, New Haven, CT, United States
BIOSILICIFICATION DRIVES A DECLINE OF DISSOLVED SI IN THE OCEANS THROUGH GEOLOGIC TIME (432230)
Daniel J Conley1, Patrick Frings2,3, Guillaume Fontorbe2 and Katharine R Hendry4, (1)Lund University, Department of Geology, Lund, Sweden, (2)Lund University, Lund, Sweden, (3)GFZ German Research Centre for Geosciences, Earth Surface Geochemistry, Potsdam, Germany, (4)University of Bristol, School of Earth Sciences, Bristol, United Kingdom
Modeling the evolving interplay of the carbon and silica cycles through Earth's history (439897)
Donald E Penman, Yale University, New Haven, CT, United States, Andy Ridgwell, University of California, Riverside, Department of Earth Sciences, Riverside, United States and Pincelli M Hull, Yale University, Department of Earth & Planetary Sciences, New Haven, CT, United States
Diatom diversity in silico (455087)
Andy Ridgwell, University of California Riverside, Riverside, CA, United States and Ben Andrew Ward, National Oceanography Centre, Southampton, United Kingdom
A change in silicic acid concentrations across the Triassic-Jurassic boundary? A look from δ30Si of sponge spicules via SIMS (457194)
Joyce Ann Yager1, A. Joshua West2, Nathaniel Stein3, Frank A Corsetti2, David J Bottjer4, William Berelson5 and Woodward W Fischer6, (1)University of Southern California, Los Angeles, United States, (2)University of Southern California, Department of Earth Sciences, Los Angeles, CA, United States, (3)University of Colorado at Boulder, Geological Sciences, Boulder, CO, United States, (4)Univ Southern California, Department of Earth Sciences, Los Angeles, United States, (5)University of Southern California, Earth Sciences, Los Angeles, United States, (6)Caltech, Division of Geological and Planetary Sciences, Pasadena, United States
Reverse weathering as a long-term stabilizer of marine pH and planetary climate (467507)
Terry T. Isson, University of Waikato, Tauranga, New Zealand and Noah Planavsky, Yale University, Department of Earth and Planetary Sciences, New Haven, CT, United States

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