2017
DOI: 10.1016/j.precamres.2016.12.014
|View full text |Cite
|
Sign up to set email alerts
|

Geochemistry of Paleoproterozoic Gunflint Formation carbonate: Implications for hydrosphere-atmosphere evolution

Abstract: The ~1880 Ma Gunflint Formation has played a critical role in shaping our view of the evolution of the Precambrian biosphere and the redox state of Earth's early oceans.Herein we present a study of the petrology and geochemistry of calcic grainstones and stromatolitic limestones present at the very top of the Gunflint Formation and compare them with underlying ankeritic grainstones that dominate the shore-proximal portion of the basin. Meteoric calcite cements in the upper limestones formed prior to the unit b… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

2
27
0

Year Published

2018
2018
2025
2025

Publication Types

Select...
4
2
1

Relationship

0
7

Authors

Journals

citations
Cited by 21 publications
(29 citation statements)
references
References 121 publications
2
27
0
Order By: Relevance
“…A compilation of literature values for seawater‐derived Cr in ca . 1.9 Ga marine sediment yields an average δ 53 Cr of 0.04 ± 0.34‰ (1σ; median = –0.10‰; Frei et al., ; Fralick et al., ), which is close to the igneous inventory (–0.12 ± 0.10‰, 2σ). By contrast, modern marine carbonate and organic‐rich siliciclastic sediment yields an average δ 53 Cr of 0.52 ± 0.15‰ (1σ; median = 0.57‰; Figure a; Bonnand, James, Parkinson, Connelly, & Fairchild, ; Gueguen et al., ; Holmden et al., ; Reinhard et al., ; Wang et al., ).…”
Section: Discussionmentioning
confidence: 61%
See 3 more Smart Citations
“…A compilation of literature values for seawater‐derived Cr in ca . 1.9 Ga marine sediment yields an average δ 53 Cr of 0.04 ± 0.34‰ (1σ; median = –0.10‰; Frei et al., ; Fralick et al., ), which is close to the igneous inventory (–0.12 ± 0.10‰, 2σ). By contrast, modern marine carbonate and organic‐rich siliciclastic sediment yields an average δ 53 Cr of 0.52 ± 0.15‰ (1σ; median = 0.57‰; Figure a; Bonnand, James, Parkinson, Connelly, & Fairchild, ; Gueguen et al., ; Holmden et al., ; Reinhard et al., ; Wang et al., ).…”
Section: Discussionmentioning
confidence: 61%
“…Fralick et al. () proposed that the phreatic calcite cements formed in a groundwater flow system that channeled meteoric waters from oxidized surface environments into the subsurface. Reduction of Cr(VI) and other redox‐sensitive metals occurred when groundwater intersected organic‐rich sediment along the flow path, inferred on the basis that the Limestone Member contains stromatolites.…”
Section: Discussionmentioning
confidence: 99%
See 2 more Smart Citations
“…The range of paleosol δ 53 Cr data from several Paleoproterozoic paleosols are also plotted as gray bars: 2.45 Ga Cooper Lake (Babechuk et al, ), 1.9 Ga Beaverlodge Lake (Toma et al, ), and 1.85 Ga Flin Flon (Babechuk et al, ). We omit the Schreiber Beach paleosol (Frei & Polat, ) owing to the evidence for trace and radiogenic element mobility (see discussion within that paper) and questions about its geologic context (i.e., whether it is a typical paleosol; Fralick et al, ). Horizontal dashed lines indicate the crustal (BSE) δ 53 Cr array (Schoenberg et al, ; Wang et al, ) [Colour figure can be viewed at wileyonlinelibrary.com]…”
Section: Resultsmentioning
confidence: 99%