Computer Science
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.1449b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Issue 9, pp.1449-1461
Computer Science
2
Scientific paper
Interstitial solution was recovered from core samples of a borehole through 472 m of the Upper Cretaceous Chalk formation in eastern England. The solution has been analysed for major and some minor components and also for oxygen and hydrogen isotopic composition. Samples of the carbonate rock have also been analysed following acid dissolution. The general feature of interstitial solution chemistry is a progressive dilution of dissolved species with decreasing depth, from a near-marine composition found in the deepest samples which are identified as connate water. Departures from the expected dilution trend are interpreted as evidence for diagenetic reactions during burial or as a result of freshwater circulation following subaerial uplift. Sr 2+ , Li + and F - have been enriched in interstitial solution and K + has been slightly depleted. The profile of chalk chemistry with depth shows no conclusive evidence for changes in the Mg and Sr content of the bulk carbonate due to freshwater diagenesis. The 18 O and D of the interstitial water reflect the same mixing as that shown by dissolved species. However an apparent depletion of 18 O and D in the deepest fluids with respect to the expected marine isotopic composition is tentatively explained as a result of the differences in diffusion rates of aqueous oxygen and hydrogen and of ionic solutes.
Bath A. H.
Edmunds W. M.
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