Mark, Geordie, Williams, Patrick J., and Boyce, Adrian J. (2003) Late quartz veining along the Cloncurry Fault, Eastern Fold Belt, NW Queensland, Australia: stable isotope evidence for the incursion of low-latitude meteoric fluids. In: Proceedings of the Seventh Biennial SGA Meeting on Mineral Exploration and Sustainable Development (1) pp. 503-506. From: Seventh Biennial SGA Meeting on Mineral Exploration and Sustainable Development, 24-28 August 2003, Athens, Greece.

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Abstract

The Mount Isa Block (MIB) preserves evidence of significant hydrothermal alteration produced during multiple periods of veining, brecciation and alteration during the Paleo- and Mesoproterozoic. Representing the last phase, are large, quartz-rich veins that form long N-S vein systems associated with brittle movement along major N-S Paleoproterozoic faults, The Cloncurry Fault represents one such system where late quartz veins formed during dilation associated with left-lateral movement. Stable isotope data for these veins show that the fluids had a calculated (at 250°C) (δ180 and (δD of -4 to +3 ‰, and - 22 to -4 ‰ respectively, which suggests they were of mixed low-latitude meteoric fluid and formation water origin, and are markedly different to the fluids associated with earlier epigenetic Cu-Au mineralization and Na-Ca alteration. The low-latitude character of the hydrothermal system suggests it was formed near to the equator, and correlation to the paleomagnetic data for the MIB, together with structural and geological considerations, and geochronological arguments suggest they formed c. 1.10 Ga or later, some 400 m.y. after Na-Ca alteration and mineralization. These results suggest that the late veining was unrelated to earlier hydrothermal alteration, and as such places into doubt previous models of the evolution of mineralisation and alteration in the Eastern Fold Belt (EFB).

Item ID:	3547
Item Type:	Conference Item (Research - E1)
ISBN:	978-90-77017-77-7
Keywords:	stable isotopes; low-latitude meteoric fluids; quartz veins; Cloncurry Fault; Australia
Related URLs:	http://www.millpress.com/
Date Deposited:	16 Jul 2009 22:31
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