Trace element and isotopic zonation in vein calcite from the Mendip Hills, UK, with spatial-process correlation analysis

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doi: 10.1016/S0016-7037(97)00065-3
Authors:Wogelius, Roy A.; Fraser, Donald G.; Wall, Gavin R. T.; Grime, Geoff W.
Author Affiliations:Primary:
University of Manchester, Department of Earth Sciences, Manchester, United Kingdom
Other:
University of Oxford, United Kingdom
Esso Exploration and Production U.K., United Kingdom
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 61(10), p.2037-2051. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1997
Note:In English. 36 refs.; illus., incl. 4 tables
Summary:The vein calcites analysed show prominent oscillatory zonation from wall to vein centre and a representative sample from Cloford was analysed by Scanning Proton (SPM), microprobe, isotopic and statistical techniques, the latter including auto- and cross-correlation to the SPM linescan data. Fine-scale zonation in Fe and Mn concentrations occur from fissure centre to wall; zonation in Pb and Zn is similar with maxima correlating with Mn. Longer wavelength fluctuations occur for Sr, and these results from a sustained change in starting composition of the aqueous phase. High-frequency oscillations are caused by mixing among fluids that have reacted with the country rock prior to calcite precipitation. Δ18O analyses plotted as a function of Δ13C result in an inverted triangular array attributed to three distinct fluids- a low Mn-Fe, high Sr marine fluid, a high Mn-Fe, low Sr hydrothermal fluid and a low Mn-Fe low Sr meteoric fluid, the latter operating in the Triassic, followed by hotter, more reduced fluids and that by transgressing sea-water in the Rhaetian-early Jurassic. [R.K.H.]
Subjects:Alkaline earth metals; Autocorrelation; C-13/C-12; Calcite; Carbon; Carbonates; Cathodoluminescence; Geochemistry; Isotope ratios; Isotopes; Metals; O-18/O-16; Oxygen; Spectra; Sr-87/Sr-86; Stable isotopes; Statistical analysis; Strontium; Trace elements; Veins; X-ray spectra; Zoning; England; Europe; Great Britain; Mendip Hills; Somerset England; United Kingdom; Western Europe; Scanning proton microprobe methods; SPM data
Coordinates:N505000 N512000 W0021500 W0035000
Abstract Numbers:97M/3893
Record ID:1997042398
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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