Microanalysis of carbonate cement δ18O in a CO2-storage system seal: Insights into the diagenetic history of the Eau Claire Formation (Upper Cambrian), Illinois Basin
Abstract
Oxygen isotope (δ18O) zonation in carbonate mineral cements is often employed as a proxy record (typically with millimeter-scale resolution) of changing temperature regimes during different stages of sediment diagenesis. Recent advances in secondary ion mass spectrometry allow for highly precise and accurate determinations of cement δ18O values to be made in situ on a micrometer scale, thus significantly increasing the spatial resolution available to studies of diagenesis in sandstone–shale and carbonate systems. Chemo-isotopically zoned dolomite–ankerite cements within shaly sandstone beds of the predominantly silty–shaly Eau Claire Formation (Cambrian, Illinois Basin) were investigated, revealing the following: with increasing depth of burial (from <0.5 to ~2 km [<1500 to 6500 ft]), cement δ18O values decrease from a high of approximately 24‰ down to approximately 14‰ (on the Vienna standard mean ocean water [VSMOW] scale, equivalent to -6.5‰ to -16.5‰ on the Vienna Peedee belemnite [VPDB] scale). The observed cross-basin trend is largely consistent with cements having formed in response to progressive sediment burial and heating. Within the context of independent burial and thermal history models for the Illinois Basin, cementation began soon after deposition and continued intermittently into the mid-Permian. Finally, however, temperatures in excess of burial model predictions are inferred atmore »
- Authors:
-
- Univ. of Wisconsin, Madison, WI (United States)
- Univ. of Wisconsin, Madison, WI (United States); Columbia Univ., New York, NY (United States). Lamont-Doherty Earth Observatory
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
- OSTI Identifier:
- 1666248
- Grant/Contract Number:
- FG02-93ER14389
- Resource Type:
- Accepted Manuscript
- Journal Name:
- AAPG Bulletin
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 06; Journal ID: ISSN 0149-1423
- Publisher:
- AAPG
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Eau Claire Fm; Illinois Basin; carbonate cements; diagenesis; oxygen isotopes; SIMS; carbon sequestration
Citation Formats
Sliwinski, Maciej G., Kozdon, Reinhard, Kitajima, Kouki, Denny, Adam, and Valley, John W. Microanalysis of carbonate cement δ18O in a CO2-storage system seal: Insights into the diagenetic history of the Eau Claire Formation (Upper Cambrian), Illinois Basin. United States: N. p., 2016.
Web. doi:10.1306/02031615065.
Sliwinski, Maciej G., Kozdon, Reinhard, Kitajima, Kouki, Denny, Adam, & Valley, John W. Microanalysis of carbonate cement δ18O in a CO2-storage system seal: Insights into the diagenetic history of the Eau Claire Formation (Upper Cambrian), Illinois Basin. United States. https://doi.org/10.1306/02031615065
Sliwinski, Maciej G., Kozdon, Reinhard, Kitajima, Kouki, Denny, Adam, and Valley, John W. Wed .
"Microanalysis of carbonate cement δ18O in a CO2-storage system seal: Insights into the diagenetic history of the Eau Claire Formation (Upper Cambrian), Illinois Basin". United States. https://doi.org/10.1306/02031615065. https://www.osti.gov/servlets/purl/1666248.
@article{osti_1666248,
title = {Microanalysis of carbonate cement δ18O in a CO2-storage system seal: Insights into the diagenetic history of the Eau Claire Formation (Upper Cambrian), Illinois Basin},
author = {Sliwinski, Maciej G. and Kozdon, Reinhard and Kitajima, Kouki and Denny, Adam and Valley, John W.},
abstractNote = {Oxygen isotope (δ18O) zonation in carbonate mineral cements is often employed as a proxy record (typically with millimeter-scale resolution) of changing temperature regimes during different stages of sediment diagenesis. Recent advances in secondary ion mass spectrometry allow for highly precise and accurate determinations of cement δ18O values to be made in situ on a micrometer scale, thus significantly increasing the spatial resolution available to studies of diagenesis in sandstone–shale and carbonate systems. Chemo-isotopically zoned dolomite–ankerite cements within shaly sandstone beds of the predominantly silty–shaly Eau Claire Formation (Cambrian, Illinois Basin) were investigated, revealing the following: with increasing depth of burial (from <0.5 to ~2 km [<1500 to 6500 ft]), cement δ18O values decrease from a high of approximately 24‰ down to approximately 14‰ (on the Vienna standard mean ocean water [VSMOW] scale, equivalent to -6.5‰ to -16.5‰ on the Vienna Peedee belemnite [VPDB] scale). The observed cross-basin trend is largely consistent with cements having formed in response to progressive sediment burial and heating. Within the context of independent burial and thermal history models for the Illinois Basin, cementation began soon after deposition and continued intermittently into the mid-Permian. Finally, however, temperatures in excess of burial model predictions are inferred at the time of latest ankerite cement precipitation, which we propose overlapped in time with conductive heating of the Eau Claire Formation (a closed system) from under- and overlying sandstone aquifers that channeled the flow of hot, Mississippi Valley–type mineralizing brines during the mid-Permian (ca. 270 Ma).},
doi = {10.1306/02031615065},
journal = {AAPG Bulletin},
number = 06,
volume = 100,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 2016},
month = {Wed Jun 01 00:00:00 EDT 2016}
}
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