The Cloncurry Lineament: geophysical and geological evidence for a deep crustal structure in the Eastern Succession of the Mount Isa Inlier

Austin, J. R., and Blenkinsop, T. G. (2008) The Cloncurry Lineament: geophysical and geological evidence for a deep crustal structure in the Eastern Succession of the Mount Isa Inlier. Precambrian Research, 163 (1-2). pp. 50-68.

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Abstract

The Cloncurry Lineament is a major feature evident from wavelet processed magnetic and gravity potential field data over the Mount Isa Inlier Eastern Succession. It is laterally continuous over 200 km of strike length and is inferred from the gravity data to extend to at least 30 km depth. It delineates the contact between two major Paleoproterozoic sedimentary sequences, and is spatially associated with a number of mineral deposits including Cannington Ag–Pb–Zn, Ernest Henry Cu–Au and many smaller Cu±Au deposits. Mapping and magnetic forward modelling along several profiles perpendicular to the Cloncurry Lineament suggests that it corresponds to the eastern margin of a 5–10 km wide deformation zone within the calc-silicate dominated Doherty Formation. The western boundary of this deformation zone is a distinct narrow fault zone (the Cloncurry Fault). The deformation zone consists of multiple generations of shearing and faulting accompanied by metasomatic alteration. Large variations in the magnetic response within the deformation zone can be modelled as subvertical brecciation zones. Breccia types range from highly magnetic actinolite–albite–magnetite breccias through to late stage, non-magnetic, quartz–K-feldspar±hematite breccias. The long-lived history of multiple reactivation, strike continuity, width and vertical extent of the deformation zone suggest that it is a major crustal structure. The structure may have originated during basin formation and later acted as a fluid pathway for alteration and base metal mineralization.

Item ID: 7049
Item Type: Article (Refereed Research - C1)
Keywords: Cloncurry Lineament; potential field worms; magnetic forward modelling; Mount Isa Inlier; Soldiers Cap Group; Doherty Formation
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ISSN: 1872-7433
Date Deposited: 23 Mar 2010 03:07
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8499 Other Mineral Resources (excl. Energy Resources) > 849999 Mineral Resources (excl. Energy Resources) not elsewhere classified @ 100%
Citation Count from Web of Science Web of Science 10
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