The Archaean Marda igneous complex,Western Australia |
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Authors: | JA Hallberg C Johnston SM Bye |
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Institution: | 1. Division of Mineralogy, CSIRO, Wembley, W.A. Australia;2. Electrolytic Zinc Company of Australasia Ltd., Bentley, W.A. Australia;3. Broken Hill Proprietary Company Ltd., Clayton, Vic. Australia |
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Abstract: | The Marda complex is a sequence of andesitic to dacitic to rhyolitic volcanic rocks filling a synformal structure in submarine basalt, banded iron-formation and siliceous sediments in the Archaean Yilgarn Block of Western Australia. The Marda volcanic rocks are in part subaerial and exhibit calc-alkaline chemistry. Their Rb/Sr age is 2635 ± 80 m.y. with an initial ratio of 0.7029 ± 0.0015. The Marda lavas represent products of a differentiated late to syn-tectonic, anatectic magma derived from the base of the Archaean crust. Calc-alkaline volcanic complexes are uncommon in the Yilgarn Block. |
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