The undoolya sequence

late Proterozoic salt influenced deposition, Amadeus Basin, central Australia

M. Kennedy*

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Parts of the Late Proterozoic to Cambrian sequence along the northeastern margin of the Amadeus Basin were deposited under the influence of salt movement within the underlying Bitter Springs Formation. Later folding during the Devonian Alice Springs Orogeny and subsequent erosion has exposed salt-influenced structures to provide a rare opportunity to observe the effects of diapiric growth on local facies and structure. Such effects are commonly only seen in seismic section. Salt withdrawal led to normal faulting and syn-sedimentary thickening of adjacent units. The Undoolya Sequence, a previously undescribed 710 m section, was deposited within a salt-withdrawal basin adjacent to a proposed diapiric structure. Periods of salt mobilization are recorded by syn-depositional thickening and localized unconformities within units flanking the diapiric structure. This structure is representative of the influence salt movement had on deposition in the northeastern Amadeus Basin during the Late Proterozoic.

Original languageEnglish
Pages (from-to)217-228
Number of pages12
JournalAustralian Journal of Earth Sciences
Volume40
Issue number3
DOIs
Publication statusPublished - 1993
Externally publishedYes

Keywords

  • Amadeus Basin
  • Diapirism
  • Late Proterozoic
  • Salt mobilization
  • Stratigraphy

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