Palaeoecology of syn-rift topography

A Late Jurassic footwall island on the Josephine Ridge, Central Graben, North Sea

Adam D. McArthur, David W. Jolley, Adrian J. Hartley, Stuart G. Archer, Hugo M. Lawrence

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Abstract

Understanding rift topography is essential for determining source areas, sediment pathways, and the type of sediment delivered to a rift basin; factors essential for interpreting petroleum systems in ancient rifts. Here we investigate Upper Jurassic sediments from the Josephine Ridge region of the Central Graben, North Sea, by integrating geophysical, palynological, petrophysical and sedimentological datasets to analyse the palaeoenvironments of the Jade and Judy horsts, the tops of which are not preserved. Interpretation of geophysical and petrophysical data together with core descriptions show study wells to step progressively away from the Josephine Ridge into adjacent grabens. One hundred and five palynological samples from six wells range from the Oxfordian to the Lower Tithonian, spanning the syn-rift period of the Central Graben. Samples from the adjacent grabens and the Jade Horst are rich in dinoflagellate cysts and possess <20% terrestrial palynomorphs. Samples from the Judy Horst contain a wide range of terrestrial palynomorphs, dominated by lycopsid, fern and moss spores, representing c.50% of the recovered palynomorphs. Correspondence analysis of the assemblages imply Jade did not possess a terrestrial ecosystem; Judy samples define seven groupings of related miospores, all interpreted to represent very low lying, relatively early successional type environments. This implies subaerial exposure of the Judy Horst during the Late Jurassic, which is interpreted to have formed an isolated, low relief, footwall crest island. This study provides a new methodology for investigating rift topography, particularly in cases where the tops of horsts were subsequently removed by erosion. The Judy Island would have separated the Central Graben into its eastern and western arms earlier than previously predicted, in the Late Oxfordian, with consequences for distribution of shallow and deep-marine reservoir quality sediments.
Original languageEnglish
Pages (from-to)63-75
Number of pages13
JournalPalaeogeography Palaeoclimatology Palaeoecology
Volume459
Early online date25 Jun 2016
DOIs
Publication statusPublished - 1 Oct 2016

Fingerprint

paleoecology
horst
footwall
North Sea
graben
topography
Jurassic
sediments
Oxfordian
sediment
sampling
well
miospore
ferns and fern allies
subaerial exposure
petroleum
Tithonian
dinoflagellate cyst
mosses and liverworts
fern

Keywords

  • palynology
  • Horst palaeoecology
  • Upper Jurassic
  • Central North Sea
  • source-to-sink

Cite this

Palaeoecology of syn-rift topography : A Late Jurassic footwall island on the Josephine Ridge, Central Graben, North Sea. / McArthur, Adam D.; Jolley, David W.; Hartley, Adrian J.; Archer, Stuart G.; Lawrence, Hugo M.

In: Palaeogeography Palaeoclimatology Palaeoecology, Vol. 459, 01.10.2016, p. 63-75.

Research output: Contribution to journalArticle

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abstract = "Understanding rift topography is essential for determining source areas, sediment pathways, and the type of sediment delivered to a rift basin; factors essential for interpreting petroleum systems in ancient rifts. Here we investigate Upper Jurassic sediments from the Josephine Ridge region of the Central Graben, North Sea, by integrating geophysical, palynological, petrophysical and sedimentological datasets to analyse the palaeoenvironments of the Jade and Judy horsts, the tops of which are not preserved. Interpretation of geophysical and petrophysical data together with core descriptions show study wells to step progressively away from the Josephine Ridge into adjacent grabens. One hundred and five palynological samples from six wells range from the Oxfordian to the Lower Tithonian, spanning the syn-rift period of the Central Graben. Samples from the adjacent grabens and the Jade Horst are rich in dinoflagellate cysts and possess <20{\%} terrestrial palynomorphs. Samples from the Judy Horst contain a wide range of terrestrial palynomorphs, dominated by lycopsid, fern and moss spores, representing c.50{\%} of the recovered palynomorphs. Correspondence analysis of the assemblages imply Jade did not possess a terrestrial ecosystem; Judy samples define seven groupings of related miospores, all interpreted to represent very low lying, relatively early successional type environments. This implies subaerial exposure of the Judy Horst during the Late Jurassic, which is interpreted to have formed an isolated, low relief, footwall crest island. This study provides a new methodology for investigating rift topography, particularly in cases where the tops of horsts were subsequently removed by erosion. The Judy Island would have separated the Central Graben into its eastern and western arms earlier than previously predicted, in the Late Oxfordian, with consequences for distribution of shallow and deep-marine reservoir quality sediments.",
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