Sm-Nd geochronology of greenstone belts in the Yilgarn Block, Western Australia

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doi: 10.1016/0301-9268(84)90007-X
Authors:Fletcher, I. R.; Rosman, Kevin J. R.; Williams, I. R.; Hickman, A. H.; Baxter, J. L.
Author Affiliations:Primary:
West. Aust. Inst. Technol., Sch. Phy. and Geosci., Bently, West. Aust., Australia
Geol. Surv. West. Aust., Australia
Volume Title:Precambrian Research
Source:Precambrian Research, 26(3-4), p.333-361. Publisher: Elsevier, Amsterdam, International. ISSN: 0301-9268
Publication Date:1984
Note:In English. 50 refs.; illus. incl. 9 tables, geol. sketch maps
Summary:Sm/Nd isotopic measurements have been used to date three widely spaced metavolcanic belts in this area; the measured isochron ages are 2780 + or - 30 m.y. (initial epsilonNd 2.5 + or - 0.3) for the Kanowna greenstones in the Eastern Goldfields province, 3050 + or - 100 m.y. (initial epsilonNd 0.9 + or - 0.7) for Diemals-Marda in the Southern Cross province and 2980 + or - 120 m.y. (initial epsilonNd 0.7 + or - 1.2) for the Warriedar fold belt in the Murchison province. These data show that substantial crustal components of approx 3000 m.y. exist in the latter two provinces and support published evidence that the Eastern Goldfields province has no crustal material older than 2800 m.y. All these ages are significantly younger than the ages found in the Western Gneiss terrain, and so support the suggestion of a progressive crustal age trend across the Yilgarn Block. The measured age values depend strongly on the inclusion of data for felsic components; data for mafic and ultramafic units would allow the eruptions at the three localities to have been contemporaneous at approx 2800 m.y. [R.A.H.]
Subjects:Absolute age; Alkaline earth metals; Dates; Geochronology; Greenstone belts; Isotopes; Metals; Metamorphic belts; Metamorphic rocks; Metavolcanic rocks; Precambrian; Rb/Sr; Sm/Nd; Sr-87/Sr-86; Stable isotopes; Strontium; Australasia; Australia; Western Australia; Yilgarn Craton; Diemals-Marda greenstone belt; Eastern Goldfields Province; Kanowna; Murchison Province; Southern Cross; Warriedar fold belt
Coordinates:S140000 N350000 E1290000 E1130000
Abstract Numbers:85M/2211
Record ID:1985024980
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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