Age determinations in the Precambrian basement of the Wadi Araba area, southwest Jordan

Details Age determinations in the Precambrian basement of the Wadi Araba area, southwest Jordan Age determinations in the Precambrian basement of the Wadi Araba area, southwest Jordan

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..63..292j&link_type=abstract

Earth and Planetary Science Letters, Volume 63, Issue 2, p. 292-304.

Computer Science

11

Scientific paper

The Precambrian basement of Jordan belongs to the northern margin of the Arabian-Nubian Shield. Age determinations by U-Pb isotopic analyses on sized and magnetic zircon fractions, a monazite and an apatite sample and by Rb-Sr isotopic studies on whole-rocks and minerals of metasedimentary rocks, granodiorites, granites and dykes have elucidated the following events:
(1)A major regional high-grade metamorphism accompanied by migmatization and synkinematic plutonism occurred at about 800 Ma according to U-Pb zircon ages of metasediments and granites.
(2)During a postkinematic plutonic event between 615 and 600 Ma extensive masses of granodioritic to granitic composition and dykes were emplaced. The U-Pb data of zircons of the rocks yielded upper intercept ages with the concordia consistent with Rb-Sr biotite ages. The Rb-Sr mineral ages of the older metasedimentary rocks document the resetting of the Rb-Sr system due to the thermal pulse at this time.
(3)A younger plutonic event produced diorites and dykes at about 570 Ma.
The plutonic events are related to the Pan-African orogenic phase. The low initial 87Sr/86Sr ratios of the plutonic rocks (0.7032-0.7046) correspond to values reported from equivalent rocks throughout the Arabian-Nubian Shield and suggest that no significant portions of ancient sialic crustal material contributed to the generation of the granitic to granodioritic magmas.

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