Paleomagnetic evidence for periods of intense oxidative weathering, McKinnons mine, Cobar, New South Wales

M. L. Smith; B. J. Pillans; K. G. McQueen

doi:10.1080/08120090802547033

Paleomagnetic evidence for periods of intense oxidative weathering, McKinnons mine, Cobar, New South Wales

M. L. Smith^*, B. J. Pillans, K. G. McQueen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

The McKinnons gold mine, ∼35 km southwest of Cobar in New South Wales is a non-operational opencut mine with extensive regolith profile development down to a depth of ∼80 m. Twenty-three oriented paleomagnetic samples, from saprolite at different levels through the profile, yielded two well-defined paleomagnetic poles, one of Paleocene age (60 ± 10 Ma), and the other of Miocene age (15 ± 4 Ma). These reflect two periods of remagnetisation associated with deep, intense, oxidative weathering under humid conditions. They provide important time constraints for the history of climate change, weathering and landscape evolution of the Cobar region.

Original language	English
Pages (from-to)	201-212
Number of pages	12
Journal	Australian Journal of Earth Sciences
Volume	56
Issue number	2
DOIs	https://doi.org/10.1080/08120090802547033
Publication status	Published - 2009

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abstract = "The McKinnons gold mine, ∼35 km southwest of Cobar in New South Wales is a non-operational opencut mine with extensive regolith profile development down to a depth of ∼80 m. Twenty-three oriented paleomagnetic samples, from saprolite at different levels through the profile, yielded two well-defined paleomagnetic poles, one of Paleocene age (60 ± 10 Ma), and the other of Miocene age (15 ± 4 Ma). These reflect two periods of remagnetisation associated with deep, intense, oxidative weathering under humid conditions. They provide important time constraints for the history of climate change, weathering and landscape evolution of the Cobar region.",

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AU - Pillans, B. J.

AU - McQueen, K. G.

PY - 2009

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N2 - The McKinnons gold mine, ∼35 km southwest of Cobar in New South Wales is a non-operational opencut mine with extensive regolith profile development down to a depth of ∼80 m. Twenty-three oriented paleomagnetic samples, from saprolite at different levels through the profile, yielded two well-defined paleomagnetic poles, one of Paleocene age (60 ± 10 Ma), and the other of Miocene age (15 ± 4 Ma). These reflect two periods of remagnetisation associated with deep, intense, oxidative weathering under humid conditions. They provide important time constraints for the history of climate change, weathering and landscape evolution of the Cobar region.

AB - The McKinnons gold mine, ∼35 km southwest of Cobar in New South Wales is a non-operational opencut mine with extensive regolith profile development down to a depth of ∼80 m. Twenty-three oriented paleomagnetic samples, from saprolite at different levels through the profile, yielded two well-defined paleomagnetic poles, one of Paleocene age (60 ± 10 Ma), and the other of Miocene age (15 ± 4 Ma). These reflect two periods of remagnetisation associated with deep, intense, oxidative weathering under humid conditions. They provide important time constraints for the history of climate change, weathering and landscape evolution of the Cobar region.

KW - Cobar

KW - Eegolith

KW - McKinnons mine

KW - New South Wales

KW - Paleomagnetic poles

KW - Weathering

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EP - 212

JO - Australian Journal of Earth Sciences

JF - Australian Journal of Earth Sciences

IS - 2

ER -

Paleomagnetic evidence for periods of intense oxidative weathering, McKinnons mine, Cobar, New South Wales

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