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Статті в журналах з теми "Cloncurry"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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1

Austin, Jim. "CSIRO: The Cloncurry METAL project delivers." Preview 2021, no. 213 (July 4, 2021): 30. http://dx.doi.org/10.1080/14432471.2021.1959098.

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2

Mark, Geordie, Patrick J. Williams, and Adrian J. Boyce. "Low-latitude meteoric fluid flow along the Cloncurry Fault, Cloncurry district, NW Queensland, Australia: geodynamic and metallogenic implications." Chemical Geology 207, no. 1-2 (June 2004): 117–32. http://dx.doi.org/10.1016/j.chemgeo.2004.02.007.

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3

Williams, P. J. "Metallogeny of the McArthur River-Mount Isa-Cloncurry minerals province; preface." Economic Geology 93, no. 8 (December 1, 1998): 1119–0. http://dx.doi.org/10.2113/gsecongeo.93.8.1119.

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4

Pollard, Peter J., Geordie Mark, and Louise C. Mitchell. "Geochemistry of post-1540 Ma granites in the Cloncurry District, Northwest Queensland." Economic Geology 93, no. 8 (December 1, 1998): 1330–44. http://dx.doi.org/10.2113/gsecongeo.93.8.1330.

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5

Mark, G., G. N. Phillips, and P. J. Pollard. "Highly selective partial melting of pelitic gneiss at Cannington, Cloncurry district, Queensland." Australian Journal of Earth Sciences 45, no. 1 (February 1998): 169–76. http://dx.doi.org/10.1080/08120099808728377.

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6

Baker, T., M. Bertelli, L. Fisher, B. Fu, W. Hodgson, M. Kendrick, G. Mark, R. Mustard, C. Ryan, and P. J. Williams. "Salt and copper in iron oxide–copper–gold systems, Cloncurry district, Australia." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A30. http://dx.doi.org/10.1016/j.gca.2006.06.168.

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7

Hutton, Laurie, Melanie Fitzell, Kinta Hoffmann, Ian Withnall, Bernie Stockill, Ben Jupp, and Paul Donchak. "The Millungera Basin—new geoscience supporting exploration." APPEA Journal 50, no. 2 (2010): 727. http://dx.doi.org/10.1071/aj09091.

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Анотація:

An unknown sedimentary sequence was first recorded during a Geoscience Australia/ Geological Survey of Queensland/ pmd*CRC deep seismic reflection survey in the Mount Isa Inlier and adjacent undercover terrains, during 2006/07. The sequence occurs unconformably underneath the Carpentaria Basin succession in the Julia Creek area, east of Cloncurry in north Queensland, and is named the Millungera Basin. A section through the basin is recorded along seismic line 07GA–IG1, recorded between north of Cloncurry to east of Croydon. In this section three internal sequences are noted—with two strongly reflective units separated by a poorly reflective unit. As well as deep crustal seismic reflection profiles, magnetotelluric profiles were collected along the same traverse. These data show a moderately conductive Millungera Basin underlying the strongly conductive Carpentaria Basin. Zones of limited reflectors beneath the basin in the seismic sections have been interpreted as granites, raising the possibility of raised geothermal gradients. The Millungera Basin may comprise a potential geothermal target. The Millungera Basin sequence is interpreted to overlie granites. Adjacent Proterozoic granites of the Williams Batholith are known to be high heat producing granites, containing high levels of potassium thorium and uranium. The hydrocarbon potential of the basin is similarly uncertain. Strong reflectors in the seismic sections may be coal beds. Although the depth of the basin in the seismic section is insufficient to have reached the oil window, interpretation of gravity profiles by Geoscience Australia suggest the basin deepens to the south, possibly reaching 4,000 m. If fertile beds have reached the oil window, the structurally more complex eastern side of the basin may contain petroleum traps. The age of the rocks in the Millungera Basin is not known. Constraints from the seismic suggest between the early Mesoproterozoic and the Middle Jurassic. Investigations into the nature of the basin are continuing. A more detailed magnetotellurc survey is being undertaken to better define the shape of the basin. In order to reliably describe the basins components, a deep drilling program is required.

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8

Williams, Patrick J., and Maree Heinemann. "Maramungee; a Proterozoic Zn skarn in the Cloncurry District, Mount Isa Inlier, Queensland, Australia." Economic Geology 88, no. 5 (August 1, 1993): 1114–34. http://dx.doi.org/10.2113/gsecongeo.88.5.1114.

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9

Williams, Patrick J. "An introduction to the metallogeny of the McArthur River-Mount Isa-Cloncurry minerals province." Economic Geology 93, no. 8 (December 1, 1998): 1120–31. http://dx.doi.org/10.2113/gsecongeo.93.8.1120.

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10

Mark, G., and D. R. W. Foster. "Magmatic–hydrothermal albite–actinolite–apatite-rich rocks from the Cloncurry district, NW Queensland, Australia." Lithos 51, no. 3 (March 2000): 223–45. http://dx.doi.org/10.1016/s0024-4937(99)00069-9.

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11

Codd, A. L., and L. Gross. "Three-dimensional inversion for sparse potential data using first-order system least squares with application to gravity anomalies in Western Queensland." Geophysical Journal International 227, no. 3 (August 13, 2021): 2095–120. http://dx.doi.org/10.1093/gji/ggab323.

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SUMMARY We present an inversion algorithm tailored for point gravity data. As the data are from multiple surveys, it is inconsistent with regards to spacing and accuracy. An algorithm design objective is the exact placement of gravity observations to ensure no interpolation of the data is needed prior to any inversion. This is accommodated by discretization using an unstructured tetrahedral finite-element mesh for both gravity and density with mesh nodes located at all observation points and a first-order system least-squares (FOSLS) formulation for the gravity modelling equations. Regularization follows the Bayesian framework where we use a differential operator approximation of an exponential covariance kernel, avoiding the usual requirement of inverting large dense covariance matrices. Rather than using higher order basis functions with continuous derivatives across element faces, regularization is also implemented with a FOSLS formulation using vector-valued property function (density and its gradient). Minimization of the cost function, comprised of data misfit and regularization, is achieved via a Lagrange multiplier method with the minimum of the gravity FOSLS functional as a constraint. The Lagrange variations are combined into a single equation for the property function and solved using an integral form of the pre-conditioned conjugate gradient method (I-PCG). The diagonal entries of the regularization operator are used as the pre-conditioner to minimize computational costs and memory requirements. Discretization of the differential operators with the finite-element method (FEM) results in matrix systems that are solved with smoothed aggregation algebraic multigrid pre-conditioned conjugate gradient (AMG-PCG). After their initial setup, the AMG-PCG operators and coarse grid solvers are reused in each iteration step, further reducing computation time. The algorithm is tested on data from 23 surveys with a total of 6519 observation points in the Mt Isa–Cloncurry region in north–west Queensland, Australia. The mesh had about 2.5 million vertices and 16.5 million cells. A synthetic case was also tested using the same mesh and error measures for localized concentrations of high and low densities. The inversion results for different parameters are compared to each other as well as to lower order smoothing. Final inversion results are shown with and without depth weighting and compared to previous geological studies for the Mt Isa–Cloncurry region.

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12

Williams, P. J. "Geological note: Diverse nature of hematization ('red rock alteration') in the Cloncurry district, northwest Queensland." Australian Journal of Earth Sciences 41, no. 4 (August 1994): 381–82. http://dx.doi.org/10.1080/08120099408728146.

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13

Mark, G. "Albitite formation by selective pervasive sodic alteration of tonalite plutons in the Cloncurry district, Queensland." Australian Journal of Earth Sciences 45, no. 5 (October 1998): 765–74. http://dx.doi.org/10.1080/08120099808728431.

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14

Xu, G. "Fluid inclusions with NaCl–CaCl2–H2O composition from the Cloncurry hydrothermal system, NW Queensland, Australia." Lithos 53, no. 1 (July 2000): 21–35. http://dx.doi.org/10.1016/s0024-4937(00)00008-6.

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15

Mark, G. "Petrogenesis of Mesoproterozoic K‐rich granitoids, southern Mt Angelay igneous complex, Cloncurry district, northwest Queensland." Australian Journal of Earth Sciences 46, no. 6 (December 1999): 933–49. http://dx.doi.org/10.1046/j.1440-0952.1999.00756.x.

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16

Kanter, Douglas. "Valentine Lawless, Lord Cloncurry, 1773–1853: From United Irishman to Liberal Politician, by Karina Holton." English Historical Review 135, no. 572 (December 12, 2019): 223–25. http://dx.doi.org/10.1093/ehr/cez368.

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17

Cant, Roger, Janelle Simpson, and Matthew Greenwood. "Geological Survey of Queensland: New Economy Resources Initiative geophysics programmes and Cloncurry extension MT results released." Preview 2021, no. 211 (March 4, 2021): 21–22. http://dx.doi.org/10.1080/14432471.2021.1905966.

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18

Baker, T. "Alteration, mineralization, and fluid evolution at the Eloise Cu-Au deposit, Cloncurry District, Northwest Queensland, Australia." Economic Geology 93, no. 8 (December 1, 1998): 1213–36. http://dx.doi.org/10.2113/gsecongeo.93.8.1213.

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19

Williams, P. J., G. Dong, C. G. Ryan, P. J. Pollard, J. F. Rotherham, T. P. Mernagh, and L. H. Chapman. "GEOCHEMISTRY OF HYPERSALINE FLUID INCLUSIONS FROM THE STARRA(Fe OXIDE)-Au-Cu DEPOSIT, CLONCURRY DISTRICT, QUEENSLAND." Economic Geology 96, no. 4 (July 1, 2001): 875–83. http://dx.doi.org/10.2113/gsecongeo.96.4.875.

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20

Williams, P. J. "GEOCHEMISTRY OF HYPERSALINE FLUID INCLUSIONS FROM THE STARRA (Fe OXIDE)-Au-Cu DEPOSIT, CLONCURRY DISTRICT, QUEENSLAND." Economic Geology 96, no. 4 (July 1, 2001): 875–83. http://dx.doi.org/10.2113/96.4.875.

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21

Ying, Hanlong, and Chuanjie Pu. "Occurrence and composition of sphene from eastern fold belt, Mount Isa Inlier, Cloncurry, northwestern Queensland, Australia." Chinese Journal of Geochemistry 24, no. 1 (January 2005): 18–27. http://dx.doi.org/10.1007/bf02869685.

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22

Austin, J. R., and T. G. Blenkinsop. "Cloncurry Fault Zone: strain partitioning and reactivation in a crustal-scale deformation zone, Mt Isa Inlier." Australian Journal of Earth Sciences 57, no. 1 (February 2010): 1–21. http://dx.doi.org/10.1080/08120090903416187.

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23

Johnson, PM, MDB Eldridge, V. Kiernan, and RJ Cupitt. "A Significant Range Extension Of The Purple-Necked Petrogale Purpureicollis Rockwallaby." Australian Mammalogy 23, no. 1 (2001): 71. http://dx.doi.org/10.1071/am01071.

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Анотація:

IN 1982, the Queensland subspecies of the blackfooted rock-wallaby Petrogale lateralis purpureicollis was reported to occur around Mt Isa and south to around Dajarra (Briscoe et al. 1982). During 1991, the known range of this taxon was extended 300 km to the north-west when an adult female P. l. purpureicollis was collected from ?Ridgepole Waterhole? in the Musselbrook Resource Reserve near Lawn Hill National Park (Eldridge et al. 1993). In 1994 the range was further extended when P. l. purpureicollis was recorded from the Constance Ranges and the upper reaches of Stockyard and Elizabeth Creeks; around the town of Cloncurry and the following distances from the town: 85 km north west; 60 and 87 km west; 4, 23, 28 and 35 km south and 15 km east (Bell et al. 1995). Approaches by the Cannington Mining operation to the southwest of McKinley in October 1999 to confirm the presence of rock-wallabies on nearby Glenholme Station established the presence of P. l. purpureicollis; a 75 km range extension to the south-east.

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24

Williams, Patrick J., W. James Pendergast, and Guoyi Dong. "Late orogenic alteration in the wall rocks of the Pegmont Pb-Zn deposit, Cloncurry District, Queensland, Australia." Economic Geology 93, no. 8 (December 1, 1998): 1180–89. http://dx.doi.org/10.2113/gsecongeo.93.8.1180.

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25

Chapman, Lucy H., and Patrick J. Williams. "Evolution of pyroxene-pyroxenoid-garnet alteration at the Cannington Ag-Pb-Zn deposit, Cloncurry District, Queensland, Australia." Economic Geology 93, no. 8 (December 1, 1998): 1390–405. http://dx.doi.org/10.2113/gsecongeo.93.8.1390.

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26

Rotherham, Jackie F., Kevin L. Blake, Ian Cartwright, and Patrick J. Williams. "Stable isotope evidence for the origin of the Mesoproterozoic Starra Au-Cu deposit, Cloncurry District, Northwest Queensland." Economic Geology 93, no. 8 (December 1, 1998): 1435–49. http://dx.doi.org/10.2113/gsecongeo.93.8.1435.

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27

Baker, T., C. Perkins, K. L. Blake, and P. J. Williams. "Radiogenic and Stable Isotope Constraints on the Genesis ofthe Eloise Cu-Au Deposit, Cloncurry District, Northwest Queensland." Economic Geology 96, no. 4 (July 1, 2001): 723–42. http://dx.doi.org/10.2113/gsecongeo.96.4.723.

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28

Perkins, C., and L. A. I. Wyborn. "Age of Cu‐Au mineralisation, Cloncurry district, eastern Mt Isa Inlier, Queensland, as determined by40Ar/39Ar dating∗." Australian Journal of Earth Sciences 45, no. 2 (April 1998): 233–46. http://dx.doi.org/10.1080/08120099808728384.

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29

OLIVER, N. H. S., M. J. RUBENACH, B. FU, T. BAKER, T. G. BLENKINSOP, J. S. CLEVERLEY, L. J. MARSHALL, and P. J. RIDD. "Granite-related overpressure and volatile release in the mid crust: fluidized breccias from the Cloncurry District, Australia." Geofluids 6, no. 4 (November 2006): 346–58. http://dx.doi.org/10.1111/j.1468-8123.2006.00155.x.

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30

Lu, Yao, Liangming Liu, and Guojian Xu. "Constraints of deep crustal structures on large deposits in the Cloncurry district, Australia: Evidence from spatial analysis." Ore Geology Reviews 79 (December 2016): 316–31. http://dx.doi.org/10.1016/j.oregeorev.2016.05.022.

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31

Baker, T. "Radiogenic and Stable Isotope Constraints on the Genesis of the Eloise Cu-Au Deposit, Cloncurry District, Northwest Queensland." Economic Geology 96, no. 4 (July 1, 2001): 723–42. http://dx.doi.org/10.2113/96.4.723.

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32

Melchiorre, E. B., P. A. Williams, T. P. Rose, and B. C. Talyn. "BIOGENIC NITROGEN FROM TERMITE MOUNDS AND THE ORIGIN OF GERHARDTITE AT THE GREAT AUSTRALIA MINE, CLONCURRY, QUEENSLAND, AUSTRALIA." Canadian Mineralogist 44, no. 6 (December 1, 2006): 1447–55. http://dx.doi.org/10.2113/gscanmin.44.6.1447.

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33

Davidson, G. J. "Variation in copper‐gold styles through time in the Proterozoic Cloncurry goldfield, Mt Isa Inlier: A reconnaissance view." Australian Journal of Earth Sciences 45, no. 3 (June 1998): 445–62. http://dx.doi.org/10.1080/08120099808728403.

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34

Babo, Joao, Carl Spandler, Nicholas H. S. Oliver, Mat Brown, Michael J. Rubenach, and Robert A. Creaser. "The High-Grade Mo-Re Merlin Deposit, Cloncurry District, Australia: Paragenesis and Geochronology of Hydrothermal Alteration and Ore Formation." Economic Geology 112, no. 2 (February 7, 2017): 397–422. http://dx.doi.org/10.2113/econgeo.112.2.397.

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35

MARSHALL, L., and N. OLIVER. "Constraints on hydrothermal fluid pathways within Mary Kathleen Group stratigraphy of the Cloncurry iron-oxide–copper–gold District, Australia." Precambrian Research 163, no. 1-2 (May 20, 2008): 151–58. http://dx.doi.org/10.1016/j.precamres.2007.08.016.

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36

Mark, Geordie, Nicholas H. S. Oliver, and Patrick J. Williams. "Mineralogical and chemical evolution of the Ernest Henry Fe oxide–Cu–Au ore system, Cloncurry district, northwest Queensland, Australia." Mineralium Deposita 40, no. 8 (February 1, 2006): 769–801. http://dx.doi.org/10.1007/s00126-005-0009-7.

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37

Foster, A. R., P. J. Williams, and C. G. Ryan. "Distribution of Gold in Hypogene Ore at the Ernest Henry Iron Oxide Copper-Gold Deposit, Cloncurry District, NW Queensland." Exploration and Mining Geology 16, no. 3-4 (July 1, 2007): 125–43. http://dx.doi.org/10.2113/gsemg.16.3-4.125.

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38

Jong, G. De, and P. J. Williams. "Giant metasomatic system formed during exhumation of mid‐crustal Proterozoic rocks in the vicinity of the Cloncurry Fault, northwest Queensland." Australian Journal of Earth Sciences 42, no. 3 (June 1995): 281–90. http://dx.doi.org/10.1080/08120099508728202.

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39

Dong, Guoyi, and Peter J. Pollard. "Identification of ferropyrosmalite by Laser Raman microprobe in fluid inclusions from metalliferous deposits in the Cloncurry District, NW Queensland, Australia." Mineralogical Magazine 61, no. 405 (April 1997): 291–93. http://dx.doi.org/10.1180/minmag.1997.061.405.12.

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40

Bertelli, Martina, and Timothy Baker. "A fluid inclusion study of the Suicide Ridge Breccia Pipe, Cloncurry district, Australia: Implication for Breccia Genesis and IOCG mineralization." Precambrian Research 179, no. 1-4 (May 2010): 69–87. http://dx.doi.org/10.1016/j.precamres.2010.02.016.

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41

Mark, G., N. H. S. Oliver, and M. J. Carew. "Insights into the genesis and diversity of epigenetic Cu – Au mineralisation in the Cloncurry district, Mt Isa Inlier, northwest Queensland." Australian Journal of Earth Sciences 53, no. 1 (February 2006): 109–24. http://dx.doi.org/10.1080/08120090500434583.

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42

Wang, Shiqi, and Patrick J. Williams. "Geochemistry and origin of Proterozoic skarns at the Mount Elliott Cu-Au(-Co-Ni) deposit, Cloncurry district, NW Queensland, Australia." Mineralium Deposita 36, no. 2 (March 19, 2001): 109–24. http://dx.doi.org/10.1007/s001260050292.

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43

WILLIAMS, P. J. "Australian Proterozoic Iron Oxide-Cu-Au Deposits: An Overview with New Metallogenic and Exploration Data from the Cloncurry District, Northwest Queensland." Exploration and Mining Geology 10, no. 3 (July 1, 2001): 191–213. http://dx.doi.org/10.2113/0100191.

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44

Melchiorre, E. B., and P. A. Williams. "Stable Isotope Characterization of the Thermal Profile and Subsurface Biological Activity during Oxidation of the Great Australia Deposit, Cloncurry, Queensland, Australia." Economic Geology 96, no. 7 (November 1, 2001): 1685–93. http://dx.doi.org/10.2113/gsecongeo.96.7.1685.

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45

AUSTIN, J., and T. BLENKINSOP. "The Cloncurry Lineament: Geophysical and geological evidence for a deep crustal structure in the Eastern Succession of the Mount Isa Inlier." Precambrian Research 163, no. 1-2 (May 20, 2008): 50–68. http://dx.doi.org/10.1016/j.precamres.2007.08.012.

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46

Perring, C. "Petrogenesis of the Squirrel Hills granite and associated magnetite-rich sill and vein complex: Lightning creek prospect, Cloncurry district, Northwest Queensland." Precambrian Research 106, no. 3-4 (March 1, 2001): 213–38. http://dx.doi.org/10.1016/s0301-9268(00)00096-6.

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47

Austin, James R., Phillip W. Schmidt, and Clive A. Foss. "Magnetic modeling of iron oxide copper-gold mineralization constrained by 3D multiscale integration of petrophysical and geochemical data: Cloncurry District, Australia." Interpretation 1, no. 1 (August 1, 2013): T63—T84. http://dx.doi.org/10.1190/int-2013-0005.1.

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Анотація:

Magnetite-rich iron oxide copper-gold deposits (IOCGs) are geologically and geochemically complex and present major challenges to geophysical investigation. They often sit beneath significant cover, exhibit magnetic remanence, and suffer from self-demagnetization effects. Because remanence in magnetite-bearing drill core samples is commonly overprinted by drilling, in situ natural remanent magnetization is difficult to measure accurately, and thus IOCGs cannot be modeled definitively using geophysics alone. We examined structural controls on a magnetite-rich IOCG in northwest Queensland and the relationships between structure, alteration, Fe oxides, and mineralization at core to deposit scale. Magnetite within the deposit has a multidomain structure, and thus it would commonly have an in situ magnetization parallel to the earth’s field. In contrast, pyrrhotite has a pseudosingle-domain structure and so it is the predominant carrier of stable remanence within the ore system. Geophysical lineament analyses are used to determine structural controls on mineralization, geophysical filters (e.g., analytic signal amplitude) are used to help define structural extent of the deposit, and basement geochemistry is used to map mineral footprints beneath cover. These techniques identified coincident anomalies at the intersection of north and northwest lineaments. Leapfrog™ interpolations of downhole magnetic susceptibility and Cu, Au, and Fe assay data were used to map the distribution of magnetite, copper, gold, and sulfur in 3D. The analysis revealed that Cu and Au mineralization were coupled with the magnetite net-vein architecture, but that Cu was locally enriched in the east–northeast-trending demagnetized zone. The results from this suite of geophysical, petrophysical, and geochemical techniques were integrated to constrain modeling of the Brumby IOCG. Brumby can be described as a breccia pipe sitting at the intersection of north-striking, east-dipping, and northwest-striking, southeast-dipping structures that plunges moderately to the south–southeast. The breccia pipe was overprinted by a relatively late net-vein magnetite breccia and crosscut by a later, magnetite-destructive, east–northeast-striking fault.

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48

Elliott, Peter, Mark A. Cooper, and Allan Pring. "Barlowite, Cu4FBr(OH)6, a new mineral isotructural with claringbullite: description and crystal structure." Mineralogical Magazine 78, no. 7 (December 2014): 1755–62. http://dx.doi.org/10.1180/minmag.2014.078.7.17.

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AbstractThe new mineral species barlowite, ideally Cu4FBr(OH)6, has been found at the Great Australia mine, Cloncurry, Queensland, Australia. It is the Br and F analogue of claringbullite. Barlowite forms thin blue, platy, hexagonal crystals up to 0.5 mm wide in a cuprite-quartz-goethite matrix associated with gerhardtite and brochantite. Crystals are transparent to translucent with a vitreous lustre. The streak is sky blue. The Mohs hardness is 2–2.5. The tenacity is brittle, the fracture is irregular and there is one perfect cleavage on {001}. Density could not be measured; the mineral sinks in the heaviest liquid available, diluted Clerici solution (D &3.8 g/cm3). The density calculated from the empirical formula is 4.21 g/cm3. Crystals are readily soluble in cold dilute HCl. The mineral is optically non-pleochroic and uniaxial (–). The following optical constants measured in white light vary slightly suggesting a small variation in the proportions of F, Cl and Br: ω 1.840(4)–1.845(4) and ε 1.833(4)–1.840(4). The empirical formula, calculated on the basis of 18 oxygen atoms and H2O calculated to achieve 8 anions and charge balance, is Cu4.00F1.11Br0.95Cl0.09(OH)5.85. Barlowite is hexagonal, space group P63/mmc, a = 6.6786(2), c = 9.2744(3) Å , V = 358.251(19) Å3, Z = 2. The five strongest lines in the powder X-ray diffraction pattern are [d(Å )(I)(hkl)]: 5.790(100)(010); 2.889(40)(020); 2.707(55)(112); 2.452(40)(022); 1.668(30)(220).

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49

Wyborn, L. "Youngerca1500 Ma granites of the Williams and Naraku Batholiths, Cloncurry district, eastern Mt Isa Inlier: Geochemistry, origin, metallogenic significance and exploration indicators∗." Australian Journal of Earth Sciences 45, no. 3 (June 1998): 397–411. http://dx.doi.org/10.1080/08120099808728400.

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50

Giraud, Jérémie, Hoël Seillé, Mark D. Lindsay, Gerhard Visser, Vitaliy Ogarko, and Mark W. Jessell. "Utilisation of probabilistic magnetotelluric modelling to constrain magnetic data inversion: proof-of-concept and field application." Solid Earth 14, no. 1 (January 18, 2023): 43–68. http://dx.doi.org/10.5194/se-14-43-2023.

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Abstract. We propose, test and apply a methodology integrating 1D magnetotelluric (MT) and magnetic data inversion, with a focus on the characterisation of the cover–basement interface. It consists of a cooperative inversion workflow relying on standalone inversion codes. Probabilistic information about the presence of rock units is derived from MT and passed on to magnetic inversion through constraints combining structural constraints with petrophysical prior information. First, we perform the 1D probabilistic inversion of MT data for all sites and recover the respective probabilities of observing the cover–basement interface, which we interpolate to the rest of the study area. We then calculate the probabilities of observing the different rock units and partition the model into domains defined by combinations of rock units with non-zero probabilities. Third, we combine these domains with petrophysical information to apply spatially varying, disjoint interval bound constraints (DIBC) to least-squares magnetic data inversion using the alternating direction method of multipliers (or ADMM). We demonstrate the proof-of-concept using a realistic synthetic model reproducing features from the Mansfield area (Victoria, Australia) using a series of uncertainty indicators. We then apply the workflow to field data from the prospective mining region of Cloncurry (Queensland, Australia). Results indicate that our integration methodology efficiently leverages the complementarity between separate MT and magnetic data modelling approaches and can improve our capability to image the cover–basement interface. In the field application case, our findings also suggest that the proposed workflow may be useful to refine existing geological interpretations and to infer lateral variations within the basement.

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