Crustal architecture of the Capricorn Orogen, Western Australia and associated metallogeny

Johnson, Simon P.; Thorne, A. M.; Tyler, I.M.; Korsch, R. J.; Kennett, B. L. N.; Cutten, H.; Goodwin, James; Blay, O.; Blewett, Richard; Joly, Aurore; Dentith, Mike; Aitken, Alan; Holzschuh, J.; Salmon, M.; Reading, Anya M.; Heinson, Graham; Boren, Goran; Ross, Jamie; Costelloe, Ross; Fomin, T.

doi:10.1080/08120099.2013.826735

Cited by 123 publications

(114 citation statements)

References 62 publications

(54 reference statements)

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“…Susceptibility of diorite that is linked to the Moorarie Supersuite (A1962, 1987) has as high susceptibility as dolerites of the Collier and Edmund Basin and diorite was concluded to be the reason for magnetic high in the area in the exploration report A1961 (1987). Magnetic susceptibility decreases with increasing age of the dolerites (Narimbunna ~1465 Ma, Kulkatharra ~1070 Ma and Mundine Well Dolerite suite ~755 Ma, Johnson et al 2013 and references within). The magnetic susceptibility from the Narimbunna dolerite outcrops was compared to the measurements taken from the two drillcores; MJGD2 and MJGD27 that intersect the unit.…”

Section: Methods and Resultsmentioning

confidence: 99%

“…These dykes represent the last known igneous event in the region, and are not metamorphosed (Wingate and Giddings, 2000). In the study area the rocks deformed and metamorphosed to prehnite-pumpellyite or greenschist facies during the 1026 to 964 Ma Edmundian Orogeny (Johnson et al, 2013). Other igneous units that contain moderate magnetic susceptibility in the field area could include the older Moorarie Supersuite rocks.…”

Section: Introductionmentioning

confidence: 99%

“…Modal mineral abundances of sedimentary rocks of Edmund and Collier groups are poorly constrained, and the abundance of accessory minerals, magnetite in particular, is not currently available for the Edmund and Collier basin lithologies. The Narimbunna dolerite sills (1465 Ma) are intruded into the Edmund Group siliciclastic rocks, whereas the Kulkatharra dolerite sills (1070 Ma) intrude both the Edmund and Collier groups (Johnson et al 2013 and references within). Muhling and Brakel (1985), who did not distinguish between these dolerites, reported that the Narimbunna and Kulkatharra sills contain plagioclase, augite, pigeonite or orthopyroxene, magnetite, subordinate quartz and orthoclase, pyrite and olivine, and their geochemistry is of high-TiO continental tholeiite.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic susceptibility of Edmund Basin, Capricorn Orogen, WA

Lampinen¹,

Occhipinti²,

Lindsay³

et al. 2016

ASEG Extended Abstracts

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SUMMARYMagnetic anomalies appear to be related to base metal prospects in the Mesoproterozoic Edmund Basin of the Western Australian Capricorn Orogen, one of them being the cause of finding the Abra Pb-Cu-Zn deposit. Our results from Edmund and Collier lithostratigraphic units show that magnetic susceptibility of the older dolerites is less than that of the younger, and that weathering appears to decrease the magnetic susceptibility response at outcrops. Sedimentary rocks and Moorarie Supersuite monzogranite have lower magnetic susceptibility than the mafic intrusive rocks. Hydrothermal quartz and diorite related to Moorarie Supersuite have high susceptibility and either of these or both may relate to magnetic highs at locations of outcropping or nearly outcropping basement rocks. Hydrothermal alteration seems linked to higher susceptibilities, but additional sampling from fresh unaltered rock and hydrothermal alteration as well as petrographic studies to define the magnetic accessory minerals in Edmund and Collier Basin lithostratigraphic units are required to understand the link between unit mineralogy and magnetic properties.

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Section: Methods and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic susceptibility of Edmund Basin, Capricorn Orogen, WA

Lampinen¹,

Occhipinti²,

Lindsay³

et al. 2016

ASEG Extended Abstracts

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“…Johnson et al (2013) suggest the Bandee Seismic Provence underlies the Ashburton Basin, the high amplitude semicontinuous seismic texture unit coincides with a high density, magnetic crust that could be interpreted in a number of different ways. One interpretation would be that the strongly magnetic, high density Hamersley-Fortescue Group rocks overlay Pilbara Crust granitoid that has low density and magnetic properties.…”

Section: The Interpretations Inmentioning

confidence: 99%

An integrated approach to mapping crustal geology and structures in the NE Capricorn Orogen, Western Australia: Implications for uranium exploration

Uren

Aitken

Occhipinti

et al. 2018

ASEG Extended Abstracts

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SUMMARYGeological, geophysical and remote sensing data have been used in the northweast Capricorn Orogen to map crustal scale structures beneath Paleoproterozoic Basins that may have focused mineralising fluids. The interpretations were largely based on upwardly continued bouguer gravity and magnetic data, then tested using petrophysically constrained forward modelling techniques. The most likely interpretation for deep crustal component of the region was found to be the Bandee Seismic Provence modelled with a mafic petrophysical character. A small portion of the study area in the northern part of the study area was modelled as an extension of the Pilbara Craton with overlying Hamersley-Fortescue Groups. Various gravity lows observed in the data were tested to determine if they represented a sub-basin, granitoid intrusion or shallow batholith. The gravity lows were found to be most likely related to granitoid intrusions. One significant deep-crustal scale structure in the central-southern part of the study area can be related to a fault mapped at surface and from Landsat 8 data. The structure has had limited exploration along its extent. The integrated approached of mapping, including surface geological mapping, indicates potential carbonaceous sediments in the hangingwall of the southern major fault zone could be prospective for uranium and gold-silver mineralisation. The friable nature of the coarse grained sandstone of the Bresnahan Group, that un-conformably overlies the carbonaceous mudstone, indicates fluid flow interaction with the unconformity could have occurred which enhances the prospectivity for uranium.

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“…The rocks could have remained buried until exhumed by a later event, such as the Paleoproterozoic orogenies that affected the PWGB (Glenburgh 2005(Glenburgh -1950 Ma and Capricorn 1820-1770 Ma orogenies; e.g. Johnson et al, 2011Johnson et al, , 2013Occhipinti et al, 1998a, b;Pirajno et al, 2004;Sheppard, Bodorkos, Johnson, Wingate, & Kirkland, 2010). This interpretation is consistent with that proposed by Muhling (1988Muhling ( , 1990) who suggested that granulite facies metamorphism commenced in the Narryer Gneiss Complex of the northern Yilgarn Craton at ca 3300 Ma but it was not uplifted until during the formation of the Capricorn Orogen at <2000 Ma.…”

Section: Peak Metamorphic Conditionsmentioning

confidence: 99%