Cited by 148Paleontology and Stratigraphy of FossilsGeological and Geochemical AnalysisGeochemistry and Elemental Analysis

Did phosphorus derived from the weathering of large igneous provinces fertilize the Neoproterozoic ocean?

Horton, Forrest·2015·Geochemistry, Geophysics, Geosystems

Abstract

Primary productivity and organic carbon burial rates in the Precambrian were highly sensitive to fluxes of phosphorus (P) from the weathering of continental crust. Large igneous provinces (LIPs)—containing substantial P and highly susceptible to chemical weathering—occurred regularly during the breakup of the Rodinia supercontinent, and flood basalts probably covered 3.7–7.4 × 10 6 km 2 at a time when a low‐latitude continental configuration expedited weathering. Assuming chemical weathering liberated much of the P contained in the flood basalts, an estimated 1–4 × 10 17 mol of biologically available P entered the ocean from LIPs between 900 and 500 Ma. Especially, voluminous LIP magmatism began at ∼850 Ma and culminated with the Franklin Province at 720 Ma, after which an estimated bioavailable P flux from flood basalts of 1–5 × 10 9 mol/yr may have been sustained for millions of years, elevating primary production and organic carbon burial rates. P enrichment of LIP magmas prior to eruption could have contributed to efficient reactive P delivery to the ocean: liquid‐crystal fractionation beneath thick cratonic lithosphere and the incorporation of metasomatic P potentially enriched Neoproterozoic LIP magmas more than anytime previously. Thus, a unique convergence of tectonic conditions—supercontinent breakup, voluminous mafic volcanism containing abundant P, and a low‐latitude continental configuration—may have facilitated an unprecedented flux of bioavailable P to the ocean that was capable of triggering oxidation of the ocean‐atmosphere system and enabling accelerated biologic diversification.

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Crossref · 10.1002/2015gc005792

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  • The plume events and associated LIPs (concentrated between 850 and 720 Ma) may have pumped out copious amounts of P via basalt weathering, stimulating primary production, organic burial, and gains in biospheric O2.

    “The plume events and associated LIPs (concentrated between 850 and 720 Ma) may have pumped out copious amounts of P via basalt weathering—stimulating primary production, organic burial, and gains in biospheric O2 (Horton, 2015, but compare Planavsky, 2018).”

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Authors
Horton, F.
Affiliations
University of California, Santa Barbara (US)
Corresponding author
Horton, Forrest
Venue
Geochemistry, Geophysics, Geosystems
Published
2015-06
Volume
16
Issue
6
Pages
1723-1738
ISSN
1525-2027 (ISSN-L)
OpenAlex
W1677061308
Cited by
147
References
101
Citations by year
2026: 21 · 2025: 14 · 2024: 20 · 2023: 13 · 2022: 17 · 2021: 10 · 2020: 12 · 2019: 10 · 2018: 9 · 2017: 12 · 2016: 6 · 2015: 3
FWCI
7.59
Type
journal article
Language
en
Open access
closed
Locations
Geochemistry Geophysics Geosystems (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
Keywords
phosphorus, large igneous provinces, Neoproterozoic, continental weathering, flood basalts, Rodinia breakup, primary productivity, organic carbon burial

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