Behavior of carbonate-associated sulfate during meteoric diagenesis and implications for the sulfur isotope paleoproxy

Gill, Benjamin C.; Lyons, Timothy W.; Frank, Tracy D.

doi:10.1016/j.gca.2008.07.001

Cited by 140 publications

(70 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, initial CAS concentrations do, in a more straightforward way, scale with seawater concentrations when abiotic precipitation dominates, as in the case with the samples for this study. Diagenesis can change primary CAS concentrations (21), and the effects of dolomitization on CAS are poorly constrained (35 34 S CAS values that closely match those from coeval sulfate evaporites, as we observe, further suggest that our samples record seawater rather than diagenetic C and S isotope signatures (Fig. 3).…”

Section: Diagenetic Influence On Carbonate Precipitationmentioning

confidence: 59%

See 1 more Smart Citation

Sulfur record of rising and falling marine oxygen and sulfate levels during the Lomagundi event

Planavsky

Bekker

Hofmann

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

187

130

View full text Add to dashboard Cite

Carbonates from approximately 2.3-2.1 billion years ago show markedly positive δ 13 C values commonly reaching and sometimes exceeding þ10‰. Traditional interpretation of these positive δ 13 C values favors greatly enhanced organic carbon burial on a global scale, although other researchers have invoked widespread methanogenesis within the sediments. To resolve between these competing models and, more generally, among the mechanisms behind Earth's most dramatic carbon isotope event, we obtained coupled stable isotope data for carbonate carbon and carbonate-associated sulfate (CAS). CAS from the Lomagundi interval shows a narrow range of δ 34 S values and concentrations much like those of Phanerozoic and modern marine carbonate rocks. The δ 34 S values are a close match to those of coeval sulfate evaporites and likely reflect seawater composition. These observations are inconsistent with the idea of diagenetic carbonate formation in the methanic zone. Toward the end of the carbon isotope excursion there is an increase in the δ 34 S values of CAS. We propose that these trends in C and S isotope values track the isotopic evolution of seawater sulfate and reflect an increase in pyrite burial and a crash in the marine sulfate reservoir during ocean deoxygenation in the waning stages of the positive carbon isotope excursion.Lomagundi excursion | Great Oxidation Event | Precambrian

show abstract

Section: Diagenetic Influence On Carbonate Precipitationmentioning

confidence: 59%

“…Further, because sulfate must be essentially depleted before the onset of appreciable methanogenesis, CAS concentrations in methanic carbonates should be very low. We would expect subsequent additional diagenetic overprints, such as meteoric recrystallization, to result in lower, rather than higher, CAS concentrations (e.g., 21).…”

mentioning

confidence: 99%

Sulfur record of rising and falling marine oxygen and sulfate levels during the Lomagundi event

Planavsky

Bekker

Hofmann

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

187

130

View full text Add to dashboard Cite

show abstract

“…5D and 6). For instance, CAS concentrations have been shown to decrease by orders of magnitude during meteoric aragonite-to-calcite alteration, but 34 S CAS values are preserved during the same process (Gill et al, 2008).…”

mentioning

confidence: 99%

Trace elements at the intersection of marine biological and geochemical evolution

Robbins

Lalonde

Planavsky

et al. 2016

Earth-Science Reviews

Self Cite

169

View full text Add to dashboard Cite

Life requires a wide variety of bioessential trace elements to act as structural components and reactive centers in metalloenzymes. These requirements differ between organisms and have evolved over geological time, likely guided in some part by environmental conditions. Until recently, most of what was understood regarding trace element concentrations in the Precambrian oceans was inferred by extrapolation, geochemical modeling, and/or genomic studies. However, in the past decade, the increasing availability of trace element and isotopic data for sedimentary rocks of all ages have yielded new, and potentially more direct, insights into secular changes in seawater composition -and ultimately the evolution of the marine biosphere. Compiled records of many bioessential trace elements (including Ni, Mo, P, Zn, Co, Cr, Se, and I) provide new insight into how trace element abundance in Earth's ancient oceans may have been linked to biological evolution. Several of these trace elements display redox-sensitive behavior, while others are redox-sensitive but not bioessential (e.g., Cr, U). Their temporal trends in sedimentary archives provide useful constraints on changes in atmosphere-ocean redox conditions that are linked to biological evolution, for example, the activity of oxygen-producing, photosynthetic cyanobacteria. In this review, we summarize available Precambrian trace element proxy data, and discuss how temporal trends in the seawater concentrations of specific trace elements may be linked to the evolution of both simple and complex life. We also examine several biologically relevant and/or redox-sensitive trace elements that have yet to be fully examined in the A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT3 sedimentary rock record (e.g., Cu, Cd, W) and suggest several directions for future studies.

show abstract

“…Fos sil-de rived datasets are there fore ex pected to be dif fi cult to in ter pret in terms of past en vi ron ments and diagenetic changes, un less spe cial care is taken to in ves ti gate only monospecific sam ples. S val ues of car bon ate-as soci ated sul phate (CAS) has been stud ied by Gill et al (2008). They found that al ter ation led to a strong de crease in CAS concen tra tion, but iso to pic ef fects in the stud ied ma te rial (Pleis tocene Key Largo Lime stone from Florida) were smaller than 2‰.…”

mentioning

confidence: 99%

“…It is pre dicted that in en vi ron ments where sul phate re duc tion is prom i nent, re moval of light sul phur from the sul phate in the fluid will lead to diagenetic sig na tures to wards more heavy d 34 S values (Gill et al, 2008). The pro cess of sul phide ox i da tion on the other hand would sup ply iso to pi cally light sul phur to the diagenetic fluid that would then lead to lower d 34 S val ues in the diagenetic cal cite (Gill et al, 2008). d…”

mentioning

confidence: 99%

Diagenetic alteration in low-Mg calcite from macrofossils: a review

Ullmann

Korte

2015

View full text Add to dashboard Cite

Behavior of carbonate-associated sulfate during meteoric diagenesis and implications for the sulfur isotope paleoproxy

Cited by 140 publications

References 53 publications

Sulfur record of rising and falling marine oxygen and sulfate levels during the Lomagundi event

Sulfur record of rising and falling marine oxygen and sulfate levels during the Lomagundi event

Trace elements at the intersection of marine biological and geochemical evolution

Diagenetic alteration in low-Mg calcite from macrofossils: a review

Contact Info

Product

Resources

About