Gillis, Kathryn M; Coogan, Laurence A (2011): Carbon chemistry of oceanic crust [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.786470, Supplement to: Gillis, KM; Coogan, LA (2011): Secular variation in carbon uptake into the ocean crust. Earth and Planetary Science Letters, 302(3-4), 385-392, https://doi.org/10.1016/j.epsl.2010.12.030
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Abstract:
Carbonate mineral precipitation in the upper oceanic crust during low-temperature, off-axis, hydrothermal circulation is investigated using new estimates of the bulk CO2 content of seven DSDP/ODP drill cores. In combination with previously published data these new data show: (i) the CO2 content of the upper ~ 300 m of the crust is substantially higher in Cretaceous than in Cenozoic crust and (ii) for any age of crust, there is substantially more CO2 in Atlantic (slow-spreading) than Pacific (intermediate- to fast-spreading) crust. Modelling the Sr-isotopic composition of the carbonates suggests that > 80% of carbonate mineral formation occurs within < 20 Myr of crust formation. This means that the higher CO2 content of Cretaceous crust reflects a secular change in the rate of CO2 uptake by the crust. Oxygen isotope derived estimates of carbonate mineral precipitation temperatures show that the average and minimum temperature of carbonate precipitation was ~10 °C higher temperatures in the Cretaceous than in the Cenozoic. This difference is consistent with previous estimates of secular change in bottom seawater temperature. Higher fluid temperature within the crust will have increased reaction rates potentially liberating more basaltic Ca and hence enhancing carbonate mineral precipitation. Additionally, if crustal fluid pH is controlled by fluid-rock reaction, the higher Ca content of the Cretaceous ocean will also have enhanced carbonate mineral precipitation. New estimates of the rate of CO2 uptake by the upper ocean crust during the Cenozoic are much lower than previous estimates.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 11.859000 * Median Longitude: -101.599737 * South-bound Latitude: -23.822300 * West-bound Longitude: 141.979280 * North-bound Latitude: 38.939700 * East-bound Longitude: -34.685300
Date/Time Start: 1976-02-06T00:00:00 * Date/Time End: 2001-12-31T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Gillis, KM; Coogan, LA (2011): (Table 1) Carbonate veins of DSDP and ODP holes. https://doi.org/10.1594/PANGAEA.786462
- Gillis, KM; Coogan, LA (2011): (Table A3) Bulk CO2 content for carbonates of ocean crust. https://doi.org/10.1594/PANGAEA.786469
- Gillis, KM; Coogan, LA (2011): (Table A2) Geochemistry and calculated temperatures for carbonates of ocean crust. https://doi.org/10.1594/PANGAEA.786467