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Besshi-type mineral systems in the Palaeoproterozoic Bryah Rift-Basin, Capricorn Orogen, Western Australia： Implications for tectonic setting and geodynamic evolution

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Geoscience Frontiers 2016年第3期7卷 345-357页

作者： Franco Pirajno Yanjing Chen Nuo Li Chao Li Limin Zhou Centre for Exploration Targeting University of Western Australia 35 Stirling Highway Crawley WA 6009 Australia Key Laboratory of Orogen and Crust Evolution Peking University Beijing 100871 China Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumcli 830011 China National Research Center for Geoanalysis Beijing 100037 China

In this contribution we use vms mineral systems in the Bryah rift-basin to constrain the tectonic setting of the widespread mafic and ultramafic magmatism that characterises the rift-basin in *** distinct,but temporally closely associated,lithostratigraphic sequences,Narracoota and Karalundi Formations,are *** Karalundi Formation is the main host of vms mineral systems in the *** Karalundi Formation consists of turbiditic and immature clastic sediments,which are locally intercalated with basaltic hyaloclastites,dolerites and banded *** propose that the basaltic hyaloclastites,dolerites and elastics and jaspilites rocks,form a distinct unit of the Karalundi Formation,named Noonyereena *** vms mineral systems occur near the north-east trendingJenkin Fault and comprise the giant and world-class DeCrussa and the Red Bore *** nature of these deposits and their intimate association with terrigenous clastic rocks and dominantly marine mafic volcanic and subvolcanic rocks,as well as the common development of peperitic margins,are considered indicative of a Besshi-type environment,similar to that of present-day Gulf of *** Re-Os age data from a primary pyrite yielded a mean model age of 2012 ± 48 Ma,which coincides（within error） with recent published Re-Os data（Hawke et al.,2015） and confirms the timing of the proposed geodynamic *** propose a geodynamic model that attempts to explain the presence of the Narracoota and Karalundi Formations as the result of mantle plume activity,which began with early uplift of continental crust with intraplate volcanism,followed by early stages of rifting with the deposition of the Karalundi Formation（and Noonyereena Member）,which led to the formation of Besshi-type vms *** on-going mantle plume activity and early stages of continental separation,an oceanic plateau was formed and is now represented by mafic-ultramafic rocks of the Narracoota Formation.

关键词： Bryah rift-basin degrussa vms Narracoota and Karalundi Formations Besshi-type deposit Geodynamic model

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