Stratigraphy and Sedimentology of the Permian of the Falkland Islands: Lithostratigraphic and Palaeoenvironmental links with South Africa

Nigel Harvey Trewin, David Iain MacPherson MacDonald, C. B. C. Thomas

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Comparison of the facies, ichnology and palaeocurrent patterns of the Permian of the Falkland Islands and the Dwyka, Ecca and Beaufort (part) groups in South Africa supports the hypothesis that the Falkland Islands lay east of South Africa in a rotated position prior to continental break-up. Key sections in the Falklands (NW Lafonia) and the Eastern Cape (Ecca Pass) would have lain about 200 km apart in Permian time. In the absence of accurate chonostratigraphic and biostratigraphic information from the Permian of the Falkland Islands, emphasis is placed on lithostratigraphic comparison. The Permian successions in both areas pass from diamictite through basin floor sediments, including organic-rich shale. rhythmites and turbidites. Mud-dominated delta front deposits culminating in channel deposits of a generally subaqueous delta top overlie the basin floor sediments. Points of close lithostratigraphic comparison am (1) the diamictites have identical appearance, facies. and compatible palaeocurrents. (2) glacial sections are overlain by organic-rich black shales; (3) K-bentonites occur in basin-floor succcssions (4) presence of basin-floor turbidite sandstone units with interbedded rhythmite units, and a distinctive Umfolozia/Undichna ichnofauna; (5) coarsening-up delta-front sequences are overlain by fining-up channel sandstone facies, (6) there is a close petrographic similarity indicating derivation of sandstones from a contemporaneous volcanic are.

The Permian successions of the two areas form parts of the fill of the eastern end of the main Karoo Basin, and were subject to the same influences of tectonic development, sediment derivation, eustatic variation and climatic change.

Original languageEnglish
Pages (from-to)5-19
Number of pages14
JournalJournal of the Geological Society
Volume159
Issue number1
Publication statusPublished - 2002

Keywords

  • Falkland islands
  • Permian
  • stratigraphy
  • sedimentology
  • palaeogeography
  • CAPE-FOLD BELT
  • KAROO BASIN
  • HISTORY

Cite this

Stratigraphy and Sedimentology of the Permian of the Falkland Islands: Lithostratigraphic and Palaeoenvironmental links with South Africa. / Trewin, Nigel Harvey; MacDonald, David Iain MacPherson; Thomas, C. B. C.

In: Journal of the Geological Society , Vol. 159, No. 1, 2002, p. 5-19.

Research output: Contribution to journalArticle

Trewin, Nigel Harvey ; MacDonald, David Iain MacPherson ; Thomas, C. B. C. / Stratigraphy and Sedimentology of the Permian of the Falkland Islands: Lithostratigraphic and Palaeoenvironmental links with South Africa. In: Journal of the Geological Society . 2002 ; Vol. 159, No. 1. pp. 5-19.
@article{31f51b0926334fad8bbc89c84250af2e,
title = "Stratigraphy and Sedimentology of the Permian of the Falkland Islands: Lithostratigraphic and Palaeoenvironmental links with South Africa",
abstract = "Comparison of the facies, ichnology and palaeocurrent patterns of the Permian of the Falkland Islands and the Dwyka, Ecca and Beaufort (part) groups in South Africa supports the hypothesis that the Falkland Islands lay east of South Africa in a rotated position prior to continental break-up. Key sections in the Falklands (NW Lafonia) and the Eastern Cape (Ecca Pass) would have lain about 200 km apart in Permian time. In the absence of accurate chonostratigraphic and biostratigraphic information from the Permian of the Falkland Islands, emphasis is placed on lithostratigraphic comparison. The Permian successions in both areas pass from diamictite through basin floor sediments, including organic-rich shale. rhythmites and turbidites. Mud-dominated delta front deposits culminating in channel deposits of a generally subaqueous delta top overlie the basin floor sediments. Points of close lithostratigraphic comparison am (1) the diamictites have identical appearance, facies. and compatible palaeocurrents. (2) glacial sections are overlain by organic-rich black shales; (3) K-bentonites occur in basin-floor succcssions (4) presence of basin-floor turbidite sandstone units with interbedded rhythmite units, and a distinctive Umfolozia/Undichna ichnofauna; (5) coarsening-up delta-front sequences are overlain by fining-up channel sandstone facies, (6) there is a close petrographic similarity indicating derivation of sandstones from a contemporaneous volcanic are.The Permian successions of the two areas form parts of the fill of the eastern end of the main Karoo Basin, and were subject to the same influences of tectonic development, sediment derivation, eustatic variation and climatic change.",
keywords = "Falkland islands, Permian, stratigraphy, sedimentology, palaeogeography, CAPE-FOLD BELT, KAROO BASIN, HISTORY",
author = "Trewin, {Nigel Harvey} and MacDonald, {David Iain MacPherson} and Thomas, {C. B. C.}",
year = "2002",
language = "English",
volume = "159",
pages = "5--19",
journal = "Journal of the Geological Society",
issn = "0016-7649",
publisher = "Geological Society of London",
number = "1",

}

TY - JOUR

T1 - Stratigraphy and Sedimentology of the Permian of the Falkland Islands: Lithostratigraphic and Palaeoenvironmental links with South Africa

AU - Trewin, Nigel Harvey

AU - MacDonald, David Iain MacPherson

AU - Thomas, C. B. C.

PY - 2002

Y1 - 2002

N2 - Comparison of the facies, ichnology and palaeocurrent patterns of the Permian of the Falkland Islands and the Dwyka, Ecca and Beaufort (part) groups in South Africa supports the hypothesis that the Falkland Islands lay east of South Africa in a rotated position prior to continental break-up. Key sections in the Falklands (NW Lafonia) and the Eastern Cape (Ecca Pass) would have lain about 200 km apart in Permian time. In the absence of accurate chonostratigraphic and biostratigraphic information from the Permian of the Falkland Islands, emphasis is placed on lithostratigraphic comparison. The Permian successions in both areas pass from diamictite through basin floor sediments, including organic-rich shale. rhythmites and turbidites. Mud-dominated delta front deposits culminating in channel deposits of a generally subaqueous delta top overlie the basin floor sediments. Points of close lithostratigraphic comparison am (1) the diamictites have identical appearance, facies. and compatible palaeocurrents. (2) glacial sections are overlain by organic-rich black shales; (3) K-bentonites occur in basin-floor succcssions (4) presence of basin-floor turbidite sandstone units with interbedded rhythmite units, and a distinctive Umfolozia/Undichna ichnofauna; (5) coarsening-up delta-front sequences are overlain by fining-up channel sandstone facies, (6) there is a close petrographic similarity indicating derivation of sandstones from a contemporaneous volcanic are.The Permian successions of the two areas form parts of the fill of the eastern end of the main Karoo Basin, and were subject to the same influences of tectonic development, sediment derivation, eustatic variation and climatic change.

AB - Comparison of the facies, ichnology and palaeocurrent patterns of the Permian of the Falkland Islands and the Dwyka, Ecca and Beaufort (part) groups in South Africa supports the hypothesis that the Falkland Islands lay east of South Africa in a rotated position prior to continental break-up. Key sections in the Falklands (NW Lafonia) and the Eastern Cape (Ecca Pass) would have lain about 200 km apart in Permian time. In the absence of accurate chonostratigraphic and biostratigraphic information from the Permian of the Falkland Islands, emphasis is placed on lithostratigraphic comparison. The Permian successions in both areas pass from diamictite through basin floor sediments, including organic-rich shale. rhythmites and turbidites. Mud-dominated delta front deposits culminating in channel deposits of a generally subaqueous delta top overlie the basin floor sediments. Points of close lithostratigraphic comparison am (1) the diamictites have identical appearance, facies. and compatible palaeocurrents. (2) glacial sections are overlain by organic-rich black shales; (3) K-bentonites occur in basin-floor succcssions (4) presence of basin-floor turbidite sandstone units with interbedded rhythmite units, and a distinctive Umfolozia/Undichna ichnofauna; (5) coarsening-up delta-front sequences are overlain by fining-up channel sandstone facies, (6) there is a close petrographic similarity indicating derivation of sandstones from a contemporaneous volcanic are.The Permian successions of the two areas form parts of the fill of the eastern end of the main Karoo Basin, and were subject to the same influences of tectonic development, sediment derivation, eustatic variation and climatic change.

KW - Falkland islands

KW - Permian

KW - stratigraphy

KW - sedimentology

KW - palaeogeography

KW - CAPE-FOLD BELT

KW - KAROO BASIN

KW - HISTORY

M3 - Article

VL - 159

SP - 5

EP - 19

JO - Journal of the Geological Society

JF - Journal of the Geological Society

SN - 0016-7649

IS - 1

ER -