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    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

    Sælen, G Tyson, R.V Telnæs, N and Talbot, M.R 2000. Contrasting watermass conditions during deposition of the Whitby Mudstone (Lower Jurassic) and Kimmeridge Clay (Upper Jurassic) formations, UK. Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 163, Issue. 3-4, p. 163.


    Raiswell, R and Al-Biatty, H.J 1989. Depositional and diagenetic C-S-Fe signatures in early Paleozoic normal marine shales. Geochimica et Cosmochimica Acta, Vol. 53, Issue. 5, p. 1147.


    Pye, K. and Krinsley, D. H. 1986. Microfabric, mineralogy and early diagenetic history of the Whitby Mudstone Formation (Toarcian), Cleveland Basin, U.K.. Geological Magazine, Vol. 123, Issue. 03, p. 191.


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Electron microscope analysis of zoned dolomite rhombs in the Jet Rock Formation (Lower Toarcian) of the Whitby area, U.K.

  • K. Pye (a1)
  • DOI: http://dx.doi.org/10.1017/S0016756800031496
  • Published online: 01 May 2009
Abstract
Abstract

Zoned dolomite rhombs which occur in the organic-rich Jet Rock Formation (Toarcian) of northeast England have been studied using backscattered scanning electron microscopy, transmission electron microscopy and energy-dispersive X-ray microanalysis. The rhombs, which are 5–20 μm in size, are variable in chemical composition, but many consist of a dolomite core surrounded by a zone of ferroan dolomite, ankerite or ferroan calcite. Zoned rhombs occur in early-diagenetic calcite-cemented concretions and layers as well as dispersed throughout the shales. Distributional and textural evidence suggests that they formed mainly by primary precipitation from pore fluids within the zone of bacterial sulphate reduction. The ferroan outer zones probably formed after burial below the sulphate reduction zone when insufficient H2S was available to react with all the Fe2+ in solution.

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Geological Magazine
  • ISSN: 0016-7568
  • EISSN: 1469-5081
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