MAGic: A Phanerozoic model for the geochemical cycling of major rock-forming components
Abstract
A dynamical model (MAGic) is presented that describes the elemental cycling of sedimentary materials involving sodium, potassium, calcium, magnesium, chloride, carbon, oxygen, iron, sulfur and phosphorous through much of the Phanerozoic. The model incorporates the basic reactions controlling atmospheric carbon dioxide and oxygen concentrations, continental and seafloor weathering of silicate and carbonate rocks, net ecosystem productivity, basalt-seawater exchange reactions, precipitation and diagenesis of chemical sediments and authigenic silicates, oxidation-reduction reactions involving carbon, sulfur, and iron, and subduction-decarbonation reactions. Although MAGic contains feedback and forcing functions adapted from the GEOCARB models (Berner, 1991, 1994; Berner and Kothavala, 2001), these functions are incorporated in a reservoir-reaction scheme that is considerably more detailed. Coupled reservoirs include shallow and deep cratonic silicate and carbonate rocks and sediments, seawater, atmosphere, oceanic sediments and basalts, and the shallow mantle. Model results are reasonably consistent with recently published constraints provided by fluid inclusion, isotopic, floral, and mineralogical records. We have used these results to evaluate sensitivity to uncertainties in the history of the earth-ocean-atmosphere system over the past 500 Ma: the advent of pelagic carbonate sedimentation, the importance of burial versus early diagenetic dolomite formation, the importance of…
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Seawater saturation state during Phanerozoic times responds, and is sensitive, to the magnitude of the marine dolomite depositional flux.
“In addition, seawater saturation state during Phanerozoic times responds, and is sensitive, to the magnitude of the marine dolomite depositional flux (Arvidson et al., 2006).”
From Evolution of Sedimentary Rocks (2014) · cites this paper as Arvidson et al., 2006
Cites
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- Authors
- Arvidson, R. S.
- Corresponding author
- Arvidson, R. S.
- ORCID
- Arvidson, R. S.
- Venue
- American Journal of Science
- Publisher
- American Journal of Science (AJS)
- Published
- 2006-03-01
- Volume
- 306
- Issue
- 3
- Pages
- 135-190
- ISSN
- 0002-9599 (ISSN-L)
- OpenAlex
- W2115554163
- Cited by
- 131
- References
- 10
- Citations by year
- 2026: 1 · 2025: 6 · 2024: 6 · 2023: 1 · 2022: 5 · 2021: 7 · 2020: 4 · 2019: 7 · 2018: 4 · 2017: 9 · 2016: 7 · 2015: 4 · 2014: 4 · 2013: 16 · 2012: 8
- FWCI
- 6.74
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- American Journal of Science (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Keywords
- MAGIC model, atmospheric CO2, ocean oxygen, continental weathering, seafloor weathering, carbon cycle, sulfur cycling, iron cycle, dolomite formation, seafloor spreading, seawater sulfate
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