Radiometric age determinations for basement from Sites 765 and 766, Argo Abyssal Plain and northwestern Australian margin

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The results of experiments in 40Ar/39Ar age dating using fresh basement material from sites 765 and 766 of Leg 123 of the Ocean Driling Program are inconsistent and cannot be used to constrain the basement age of the Argo Abyssal Plain in the Indian Ocean. However, a celadonite sample, which was precipitated during a low-temperature alteration event that affected the basement at Site 765, yielded a K-Ar age of 155.3 ± 3.4 Ma. Celadonites yield ages that are up to 15 Ma younger than the age for the formation of basement. Thus, the celadonite age is retained as a reliable minimum age for basement at Site 765. This radiometric age is inconsistent with biostratigraphic ages, which indicate a maximum of late Berriasian (approximately 140 Ma), but is consistent with geophysical interpretations of marine magnetic anomalies and with the early north-south seafloor spreading history of the Argo Abyssal Plain region. -from Author

Original languageEnglish
Title of host publicationArgo Abyssal Plain/Exmouth Plateau sites 765-766
PublisherTexas A&M University
Pages557-562
Number of pages6
DOIs
Publication statusPublished - Aug 1992

Publication series

NameProceedings of the Ocean Drilling Program, Scientific Results
Volume123
ISSN (Print)1096-7451

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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