Implications of K-Ar dating of fault gouges in NNE trending faults, Sydney region

David J. Och; Offler Robin; Zwingmann Horst; Braybrooke John

doi:10.1071/ASEG2006ab125

ISSN: 2202-0586
E-ISSN:

oa Implications of K-Ar dating of fault gouges in NNE trending faults, Sydney region
Authors David J. Och^a, Offler Robin^b, Zwingmann Horst^c and Braybrooke John^d
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^a SMEC Australia Pty Ltd, Level 5 118 Walker Street North Sydney, NSW, 2060, [email protected] ^b University of NewcastleDiscipline of Earth SciencesUniversity of Newcastle, NSW, 2308, [email protected] ^c CSIRO Petroleum, PO 1130 Bentley, WA, 6102, [email protected] ^d Douglas Partners Pty Ltd, 96 Hermitage Rd West West Ryde, NSW, 2114, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2006, Issue ASEG2006 - 18th Geophysical Conference, Dec 2006, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2006ab125
- Published online: 01 Dec 2006

Abstract

In this paper, we discuss the currently identified major faults in the Sydney region based on mapping of deep excavations, tunnels and outcrops. Further, we present K-Ar data obtained from illite-smectite in fault gouges that occur in several identified fault zones. Our studies have shown that major, NNE trending faults dominate the Sydney region and that ages of 122 to 134 Ma are recorded in the <2μm fraction extracted from the fault gouges. We believe these dates record an overprinting event possibly related to underplating of mafic magma associated with the early stages of the breakup of Gondwana.

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References

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Zwingmann, H., Offler, R., Wilson, T., and Cox, S. F., 2004, K-Ar dating of fault gouge in the northern Sydney Basin, NSW, Australia-implications for the breakup of Gondwana. Journal of Structural Geology. 26, 2285-2295.

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Article Type: Research Article

Keyword(s): fault gouges; Faults; K-Ar dating; Sydney region

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oa Implications of K-Ar dating of fault gouges in NNE trending faults, Sydney region

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