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Contributions to Mineralogy and Petrology

, Volume 68, Issue 4, pp 429–439 | Cite as

An evaluation of the zircon method of isotopic dating in the Southern Arabian Craton

  • J. A. Cooper
  • J. S. Stacey
  • D. G. Stoeser
  • R. J. Fleck
Article

Abstract

A zircon study has been made on eleven samples of igneous rocks from the Saudi Arabian Craton. Ages of sized and magnetic fractions of zircon concentrates show variable degrees of discordance which seem to result from a very young disturbance that produces linear arrays in the Concordia plot. Model age calculations based on a statistically and geologically reasonable lower intercept produce very consistent internal relationships. The Pan African Orogeny, considered to be responsible for loss of radiogenic argon and strontium from minerals of many rocks, does not appear to have affected the zircon data, even though uplift had exposed the rocks of the Arabian Shield at that time.

Tonalite, granodiorite, and crosscutting leucoadamellite bodies in the southern part of the An Nimas Bathylith yield ages in the time range 820−760 Ma. A narrow time range of 660 to 665 million years was indicated for ages of widely separated and compositionally different intrusive bodies all to the east of the An Nimas Bathylith. This work suggests that the younger end of the age spectrum established from regional K-Ar and Rb-Sr measurements may be underestimated, and that magmatic activity could be more episodic than previously assumed.

Keywords

Zircon Strontium Linear Array Orogeny Intrusive Body 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • J. A. Cooper
    • 1
  • J. S. Stacey
    • 2
  • D. G. Stoeser
    • 3
  • R. J. Fleck
    • 4
  1. 1.Dept. Geology and MineralogyUniversity of AdelaideAdelaide
  2. 2.U.S. Geological SurveyDenver Federal CenterLakewoodUSA
  3. 3.U.S. Geological SurveySaudi Arabian MissionNew YorkUSA
  4. 4.U.S. Geological SurveyMenlo ParkUSA

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