Journal article
Neoproterozoic (ca. 820-830Ma) mafic dykes at Olympic Dam, South Australia: Links with the Gairdner Large Igneous Province
Q Huang, VS Kamenetsky, J McPhie, K Ehrig, S Meffre, R Maas, J Thompson, M Kamenetsky, I Chambefort, O Apukhtina, Y Hu
Precambrian Research | Published : 2015
Abstract
A suite of basaltic to doleritic dykes (named the Olympic Dam dolerite) has been intersected in drill holes at the Olympic Dam iron oxide Cu-U-Au-Ag deposit in the Gawler Craton, South Australia. The dykes intrude the ca. 1600. Ma Roxby Downs Granite as well as the Olympic Dam Breccia Complex, and range from several centimetres to over 100 m in width, strike NW and dip subvertically. Clinopyroxene and plagioclase are the major minerals, together with accessory apatite and Ti-magnetite. Magmatic apatite crystals in medium-grained doleritic dykes have been dated by LA-ICPMS (Laser Ablation Inductively Coupled Plasma Mass Spectrometry), and yielded a U-Pb age of 825. ±. 18. Ma. The Olympic Dam ..
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Funding Acknowledgements
This project was funded by BHP Billiton and the Australian Research Council. We thank Ben Cave (University of Tasmania), Teena Rusak and Stacey McAvaney (DMITRE) for introduction to the SARIG Database, and Katie McGoldrick and Phil Robinson (University of Tasmania) for analytical work. We also thank Yuhao Dai (ANU) for literature delivery and Weidong Sun and Mingxing Ling (GIG, CAS) for facilitating analyses. An anonymous reviewer, David Chew, and associate Editor Balz Kamber provided very helpful reviews of the manuscript.