Geophysical delineation and mineral potential of mafic-ultramafic intrusions in the Arunta Region  


Authors / CoAuthors

Meixner, T. | Hoatson, D. | Miezitis, Y. | Jaireth, S. | Claoue-Long, J.C.

Abstract

The Arunta Region of central Australia is a geologically complex and tectonically longlived terrane which has been subjected to several periods of magmatism. SHRIMP U-Pb dating of zircons by Claoué-Long and Hoatson (2005) constrain the major mafic magmatic events to the dominantly tholeiitic ~1810-1800 Ma Stafford Event, the ~1790-1770 Ma Yambah Event, ~1690 Ma Strangways Event, ~1635 Ma Liebig Event, and a much younger event of probable early Palaeozoic age. A further event (Teapot) at ~1135 Ma has alkaline-ultramafic affinities. Field-relationships and mineralisation-features of the intrusions are described by Hoatson and Stewart (2001), and Hoatson et al. (2005). The intrusions form large homogeneous mafic granulite and gabbroic bodies, stacked sequences of high-level sills, small pods, laterally extensive amphibolite sheets, and relatively undeformed ultramafic plugs. The intrusions occur in proximity to major province-wide faults where differential movements have resulted in the exposure of the intrusions from crustal depths ranging from ~5 km to ~25 km. Metamorphic grades range from granulite to sub-amphibolite facies. Chilled and contaminated margins and net-vein complexes resulting from the commingling of mafic and felsic magmas indicate that most intrusions crystallised in situ and were not tectonically emplaced. <p>Related product:<a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&amp;catno=64764">Evolution and metallogenesis of the North Australian Craton Conference Abstracts</p>

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nonGeographicDataset

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70529

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Commonwealth of Australia (Geoscience Australia)  
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Keywords

  • PowerPoint
( Theme )
  • geology
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  • metallogenesis
Australian and New Zealand Standard Research Classification (ANZSRC)
  • Earth Sciences
  • Published_Internal

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2006-01-01T00:00:00

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