Emplacement and metamorphism of Archaean mafic volcanics at Kambalda, Western Australia--geochemical and isotopic constraints

Details Emplacement and metamorphism of Archaean mafic volcanics at Kambalda, Western Australia--geochemical and isotopic constraints Emplacement and metamorphism of Archaean mafic volcanics at Kambalda, Western Australia--geochemical and isotopic constraints

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1305r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 6, pp.1305-1318

Physics

8

Scientific paper

Extensive exploration and mining at Kambalda, Western Australia has revealed a conformable mafic-ultramafic succession consisting of a sulphide ore bearing ultramafic layer located between metabasalt units. Geochemical and Rb-Sr, U-Pb isotopic analyses have been carried out on two 70-140 m sections of drill core from the metabasalts and U-Pb isotopic analyses have been made on sulphide ore samples. Greenschist metamorphism of the metabasalts is dated at 2610 ± 30 m.y. and was approximately isochemical except for addition of H 2 O and CO 2 and a differential mobilization of K and Rb within the units. The addition of H 2 O and CO 2 is believed to have taken place shortly after extrusion of the metabasalts in a submarine environment resulting in an early greenschist metamorphism. The later 2600 m.y. event is correlated with a high thermal regime also detected at Kalgoorlie 50 km to the north. A Pb-Pb isochron age of 2720 ± 105 m.y. may represent the metamorphic event or the time of emplacement of the metabasalts. New Sm-Nd data (C et al .; c -L et al .) suggest the mafic volcanics are 3200 m.y. old. If true large scale homogenization of Pb isotopes is required. Alternatively the mafic sequence may be only slightly older than 2800 m.y. and the Sm-Nd data does not have time significance.

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