Early diagenetic septarian concretions from the oxtordian (Jurassic) Corallian Group, Osmington Mills, Dorset, UK

DJ Green*, D Pirrie

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    Early diagenetic septarian concretions nucleated around large oyster shells are common in the Oxfordian (Late jurassic) Nothe Grit Formation of the Corallian Group at Osmington Mills, Dorset, UK. The host sediment is dominated by quartz, feldspar, mica and clay minerals along with abundant bioclasts. The concretions are predominantly composed of non-ferroan calcite, post-dated by ferroan calcite, along with minor pyrite, glauconite and silica (chalcedony and quartz) cements. Radial septarian fractures are infilled by non-ferroan and ferroan calcite cements. The first phase of calcite cementation occurred prior to significant compaction; septarian fracture generation occurred following burial and localised over-pressuring of tile sediment.

    Original languageEnglish
    Title of host publicationGEOSCIENCE IN SOUTH-WEST ENGLAND,
    EditorsD Pirrie
    PublisherUSSHER SOC
    Pages142-148
    Number of pages7
    VolumeVOL 10, PT 2
    Publication statusPublished - 2001
    Event39th Ussher-Society Conference - Sidmouth, United Kingdom
    Duration: 3 Jan 20016 Jan 2001

    Publication series

    NameProceedings of the Ussher Society
    PublisherUSSHER SOC
    Volume10
    ISSN (Print)0566-3954

    Conference

    Conference39th Ussher-Society Conference
    Country/TerritoryUnited Kingdom
    CitySidmouth
    Period3/01/016/01/01

    Keywords

    • SOUTHERN ENGLAND
    • MARINE
    • GENESIS
    • SEDIMENTATION
    • INDICATORS
    • MUDSTONES
    • CYCLES
    • ORIGIN
    • COAST

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