The origin of late spar cements in the Lincolnshire Limestone, Jurassic of central England

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doi: 10.1144/gsjgs.145.4.0621
Authors:Emery, D.; Hudson, J. D.; Marshall, J. D.; Dickson, J. A. D.
Author Affiliations:Primary:
Br. Petrol. Co., London, United Kingdom
Univ. Leicester, United Kingdom
Univ. Liverpool, United Kingdom
Univ. Cambridge, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, 145(4), p.621-633. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1988
Note:In English. 41 refs.; illus. incl. 2 tables, sects., geol. sketch maps
Summary:The C and O isotopic compositions of the Bajocian in this area are shown to be determined largely by two end-member components: marine precipitates and later sparry burial cements. The origin of so much cement is controversial. Formation-wide sampling and mapping of stable isotopic compositions of burial cements in this region, combined with a knowledge of its burial history and thermal evolution, can be used to distinguish the influences of two different water types: 1) a S province associated with thinning of the limestone, maximum burial of 300 m, and light Δ18O and Δ13C compositions, and 2) a central province, burial of ∼550 m, and less 18O- and 13C-depleted cement compositions. The relative isotopic depletion of the S province ferroan burial cements is considered to be a function of their precipitation from meteoric waters at T of ∼24°C. In the central province basinal waters of both marine and meteoric origin are believed to have precipitated the late spar with associated up-dip fluid movement at T of 29-39°C. 13C depletion in the former is ascribed to persistence of 13C depleted soil-gas CO2 in the precipitating waters, and in the latter to be controlled by the input of CO2 derived from thermal oxidation of organic matter. [R.E.S.]
Subjects:C-13/C-12; Carbon; Carbonate rocks; Cement; Cementation; Chemical analysis; Chemically precipitated rocks; Diagenesis; Geochemistry; Isotopes; Jurassic; Limestone; Mesozoic; O-18/O-16; Oxygen; Sedimentary petrology; Sedimentary rocks; Stable isotopes; England; Europe; Great Britain; Lincolnshire England; London England; United Kingdom; Western Europe; Ratios
Abstract Numbers:89M/0636
Record ID:1988060141
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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