Isotope and rare earth element evidence for a late Archaean terrane boundary in the southeastern Pilbara Craton, Western Australia

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doi: 10.1016/0301-9268(92)90071-U
Authors:Tyler, I. M.; Fletcher, I. R.; de Laeter, J. R.; Williams, I. R.; Libby, W. G.
Author Affiliations:Primary:
Geol. Surv. West. Aust., East Perth, West. Aust., Australia
Curtin Univ. Technol., Australia
Volume Title:Precambrian Research
Source:Precambrian Research, 54(2-4), p.211-229. Publisher: Elsevier, Amsterdam, International. ISSN: 0301-9268
Publication Date:1992
Note:In English. 39 refs.; illus. incl. 4 tables, geol. sketch maps
Summary:Rb-Sr, Sm-Nd and REE data have been obtained from granitic rocks in the SE part of the Pilbara craton. Almost all the samples have 87Rb/86Sr < 4.0, 147Sm/144Nd < 0.12, and Sm-Nd model ages in the range 3100-3300 m.y. These characteristics, together with REE patterns, differ from published data for granitic rocks of the N Pilbara granite-greenstone terrain that have similar geological histories. Rb/Sr isotope systematics have been variably disturbed, with data arrays on isochron plots indicating ages younger than the accepted age of the base of the Hamersley basin succession (2760 m.y.). This is attributed to pervasive burial metamorphism beneath the Hamersley basin, and to later hydrothermal events. Some rock units appear to be younger than their N Pilbara equivalents. A shear zone separating the Mosquito creek synclinorium from the Kurrana batholith has the characteristics of a suture zone, and is postulated to be the boundary between two distinct terrains that joined to form the Pilbara craton between 3000 and 2760 m.y. [R.E.S.]
Subjects:Absolute age; Alkaline earth metals; Archean; Dates; Geochemistry; Granites; Greenstone; Igneous rocks; Isochrons; Isotopes; Metals; Metamorphic rocks; Neoarchean; Petrography; Plutonic rocks; Precambrian; Rare earths; Rb/Sr; Schists; Shear zones; Sm/Nd; Sr-87/Sr-86; Stable isotopes; Strontium; Terranes; Australasia; Australia; Hamersley Basin; Pilbara Craton; Western Australia; Billinooka Inlier; Bonnie Downs Granite; Cooninia Inlier; Kurrana Batholith; Mosquito Creek Synclinorium; Sylvania Inlier
Abstract Numbers:92M/3044
Record ID:1992004100
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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