HYC (McArthur River) SEDEX deposit, Australia: First paleomagnetic results

Symons, D. T. A.

doi:10.1016/j.gexplo.2005.11.087

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…These heavily mineralized black shales gave two well-clustered ChRM components from which the temporal and geodynamic setting were established during ore formation that created the necessary conditions of high-salinity fluids and topographic relief to drive the fluids. Similarly Symons (2006) has reported palaeomagnetic dating for the huge HYC SEDEX deposit in Australia. Here, also, the rich massive Zn-Pb ore is hosted by black shale and has a highly clustered post-folding site mean direction.…”

Section: Discussionmentioning

confidence: 89%

“…Here, also, the rich massive Zn‐Pb ore is hosted by black shale and has a highly clustered post‐folding site mean direction. This led Symons (2006) to conclude that the mineralization was epigenetic in origin, having been formed by hydrothermal fluids. These independent results show that epigenetic hydrothermal processes are capable of causing well‐clustered ChRM directions in SEDEX black shale deposits.…”

Section: Discussionmentioning

confidence: 99%

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Current-scattered (?) detrital remanence directions in the Zn-rich Pennsylvanian Stark black shale, USA

Kawasaki¹,

Symons²,

Coveney³

2007

Geophysical Journal International

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S U M M A R YPalaeomagnetic results are reported from the metalliferous Stark black shale in the Upper Pennsylvanian (Missourian/Kasimovian) Kansas City Group. Palaeomagnetic analysis of 400 specimens from 28 sites gives a characteristic remanent magnetization in 17 sites of the shale that yields a Late Mississippian to Middle Pennsylvanian palaeopole at 32.2 • N 128.5 • E (dp = 4.7 • and dm = 8.8 • ). The observed palaeomagnetic age is slightly older than the host rock, indicating that the mineralization of the Stark Shale has, excluding recent alteration, a primary sedimentary or syngenetic origin. The reason for the slightly older age is likely due to trace modern hematite that slightly steepens the remanence inclination. The large oval of 95 per cent confidence is interpreted to be caused by clay-magnetite aggregates that formed during sediment transport and the biasing effect of the gentle palaeocurrent at each site acting on the large aggregates. Therefore, the scattered distribution of the site mean remanence declinations found for the Stark Shale is evidence of a detrital remanent magnetization that is formed by primary sedimentary processes with an enriched metallic content and not remagnetization with mineralization by secondary hydrothermal processes.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%