Journal articles: 'Yilgarn'

1

Gray, David J. "Hydrogeochemistry in the Yilgarn Craton." Geochemistry: Exploration, Environment, Analysis 1, no. 3 (August 2001): 253–64. http://dx.doi.org/10.1144/geochem.1.3.253.

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2

Cassidy, Kevin F., and Stephen Wyche. "Thematic Issue: Archean Evolution—Yilgarn Craton." Australian Journal of Earth Sciences 59, no. 5 (July 2012): 599–601. http://dx.doi.org/10.1080/08120099.2012.704882.

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3

Czarnota, K., D. C. Champion, B. Goscombe, R. S. Blewett, K. F. Cassidy, P. A. Henson, and P. B. Groenewald. "Geodynamics of the eastern Yilgarn Craton." Precambrian Research 183, no. 2 (November 2010): 175–202. http://dx.doi.org/10.1016/j.precamres.2010.08.004.

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4

Bevan, J., M. Elias, and J. Vearncombe. "The Yilgarn Retrospective 1950–99 Symposium." Applied Earth Science 125, no. 4 (October 2016): 190–201. http://dx.doi.org/10.1080/03717453.2016.1258101.

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5

Cockbain, A. E. "Regolith geology of the Yilgarn Craton." Australian Journal of Earth Sciences 49, no. 1 (February 2002): 1. http://dx.doi.org/10.1046/j.1440-0952.2002.00913.x.

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6

Chivas, Allan R., and Julius R. Atlhopheng. "Oxygen-isotope dating the Yilgarn regolith." Geological Society, London, Special Publications 346, no. 1 (2010): 309–20. http://dx.doi.org/10.1144/sp346.16.

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7

Talebi, Hassan, Jelena Markov, Walid Salama, Alex Otto, Vasek Metelka, Ravi Anand, and Dave Cole. "Targeting Paleovalley-Related Ferricrete Units in Yilgarn Craton Using High-Resolution Aeromagnetic Data and Spatial Machine Learning." Minerals 12, no. 7 (July 13, 2022): 879. http://dx.doi.org/10.3390/min12070879.

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The ferricrete units (Fe oxide cemented colluvial-alluvial sediment) of the Yilgarn Craton in Western Australia formed during the humid tropical and sub-tropical climates of the Cenozoic. Ferricretes are generally developed on long-lived paleodrainage systems and are products of the ferruginisation of detritus provided by the continuous erosion of upslopes. These iron-rich accumulations can become Au-enriched, as is the case in several locations previously discovered in the Yilgarn Craton; many of these host economic secondary gold deposits (e.g., Moolart Well, Mt Gibson, and Bulchina), typically occurring downslope of low saprolite hills and near paleovalleys (i.e., inset-valleys). Inset-valleys are a common paleotopographic feature buried under Quaternary alluvial and colluvial sedimentary cover. Maps of these ancient channel networks can be used as a proxy for targeting ferricrete gold deposits. These inset-valley systems generally form dendritic and noisy patterns in high-resolution aeromagnetic data due to the presence of maghemite-rich nodules and detrital magnetic pisoliths on their flanks. The main aim of this study was to use high-resolution aeromagnetic data to target ferricrete units related to inset-valleys systems across the Yilgarn Craton. A spatial predictive model was used to learn and predict the geological units of interest from pre-processed aeromagnetic data. The predicted inset-valleys systems were able to confine the exploration space and define a new exploration frontier for ferricrete gold deposits.

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8

Lin, Xiangdong, Huaiyu Yuan, Michael C. Dentith, Ruth Murdie, Klaus Gessner, and Avinash Nayak. "Improved full waveform moment tensor inversion of Cratonic intraplate earthquakes in southwest Australia." Geophysical Journal International 227, no. 1 (May 31, 2021): 123–45. http://dx.doi.org/10.1093/gji/ggab214.

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SUMMARY In contrast to global observations in stable continental crust, the present-day orientation of the maximum horizontal stress in Western Australia is at a high angle to plate motion, suggesting that in addition to large-scale plate driving forces, local factors also play an important role in stress repartitioning. As a reliable stress indicator, full waveform moment tensor solutions are calculated for earthquakes that occurred between 2010 and 2018 in the southern Yilgarn Craton and the adjacent Albany-Fraser Orogen in southwestern Australia. Due to regional velocity heterogeneities in the crust, we produced two geographically distinct shear wave velocity models by combining published crustal velocity models with new ambient noise tomography results. We applied a full waveform inversion technique to 15 local earthquakes and obtained 10 robust results. Three of these events occurred near Lake Muir in the extreme south of the study area within the Albany-Fraser Orogen. The focal mechanism of the 16th September 2018 Lake Muir event is thrust; two ML≥ 4.0 aftershocks are normal and strike-slip. Our results are consistent with field observations, fault orientations inferred from aeromagnetic data and surface displacements mapped by Interferometric Synthetic Aperture Radar which are all consistent with reactivation of existing faults. The other seven solutions are in the southeastern Yilgarn Craton. These solutions show that the faulting mechanisms are predominantly thrust and strike-slip. This kinematic framework is consistent with previous studies that linked active seismicity in the Yilgarn Craton to the reactivation of the NNW–SSE oriented Neoarchean structures by an approximately E–W oriented regional stress field. Our results suggest that the kind of faulting that occurs in southwest Australia is critically dependent on the local geological structure. Thrust faulting is the dominant rupture mechanism, with some strike-slip faulting occurring on favourably oriented structures.

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9

Chen, She Fa, Arthur Hickman, Kevin F. Cassidy, Martin Van Kranendonk, Bruce Groenewald, and Stephen Wyche. "Archaean tectonics in the Pilbara and Yilgarn Cratons." ASEG Extended Abstracts 2006, no. 1 (December 2006): 1. http://dx.doi.org/10.1071/aseg2006ab025.

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10

TOMICH, S. A. "Auriferous sediments of the Yilgarn Block, Western Australia." Geology Today 6, no. 6 (November 1990): 190–93. http://dx.doi.org/10.1111/j.1365-2451.1990.tb00739.x.

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11

Zibra, I., Y. Lu, F. Clos, R. F. Weinberg, M. Peternell, M. T. D. Wingate, M. Prause, M. Schiller, and R. Tilhac. "Regional-scale polydiapirism predating the Neoarchean Yilgarn Orogeny." Tectonophysics 779 (March 2020): 228375. http://dx.doi.org/10.1016/j.tecto.2020.228375.

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12

Reading, A. M., B. L. N. Kennett, and M. C. Dentith. "Seismic structure of the Yilgarn Craton, Western Australia." Australian Journal of Earth Sciences 50, no. 3 (June 2003): 427–38. http://dx.doi.org/10.1046/j.1440-0952.2003.01000.x.

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13

Myers, John S., and Keith P. Watkins. "Origin of granite-greenstone patterns, Yilgarn Block, Western Australia." Geology 13, no. 11 (1985): 778. http://dx.doi.org/10.1130/0091-7613(1985)13<778:oogpyb>2.0.co;2.

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14

Zibra, Ivan. "Neoarchean structural evolution of the Murchison Domain (Yilgarn Craton)." Precambrian Research 343 (July 2020): 105719. http://dx.doi.org/10.1016/j.precamres.2020.105719.

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15

Ivanic, T. J., O. Nebel, F. Jourdan, K. Faure, C. L. Kirkland, and E. A. Belousova. "Heterogeneously hydrated mantle beneath the late Archean Yilgarn Craton." Lithos 238 (December 2015): 76–85. http://dx.doi.org/10.1016/j.lithos.2015.09.020.

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16

Myers, John S. "Early archaean narryer gneiss complex, Yilgarn Craton, Western Australia." Precambrian Research 38, no. 4 (April 1988): 297–307. http://dx.doi.org/10.1016/0301-9268(88)90029-0.

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17

Hallberg, J. A. "Postcratonization mafic and ultramafic dykes of the Yilgarn Block." Australian Journal of Earth Sciences 34, no. 1 (March 1987): 135–49. http://dx.doi.org/10.1080/08120098708729398.

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18

Zibra, I., F. Clos, R. F. Weinberg, and M. Peternell. "The ~2730 Ma onset of the Neoarchean Yilgarn Orogeny." Tectonics 36, no. 9 (September 2017): 1787–813. http://dx.doi.org/10.1002/2017tc004562.

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19

Guzik, M. T., K. M. Abrams, S. J. B. Cooper, W. F. Humphreys, J. L. Cho, and A. D. Austin. "Phylogeography of the ancient Parabathynellidae (Crustacea:Bathynellacea) from the Yilgarn region of Western Australia." Invertebrate Systematics 22, no. 2 (2008): 205. http://dx.doi.org/10.1071/is07040.

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The crustacean order Bathynellacea is a primitive group of subterranean aquatic (stygobitic) invertebrates that typically inhabits freshwater interstitial spaces in alluvia. A striking diversity of species from the bathynellacean family Parabathynellidae have been found in the calcretes of the Yilgarn palaeodrainage system in Western Australia. Taxonomic studies show that most species are restricted in their distribution to a single calcrete, which is consistent with the findings of other phylogeographic studies of stygofauna. In this, the first molecular phylogenetic and phylogeographic study of interspecific relationships among parabathynellids, we aimed to explore the hypothesis that species are short-range endemics and restricted to single calcretes, and to investigate whether there were previously unidentified cryptic species. Analyses of sequence data based on a region of the mitochondrial (mt) DNA cytochrome c oxidase 1 gene showed the existence of divergent mtDNA lineages and species restricted in their distribution to a single calcrete, in support of the broader hypothesis that these calcretes are equivalent to closed island habitats comprising endemic taxa. Divergent mtDNA lineages were also observed to comprise four new and 12 recognised morphospecies. These results reflect the findings of previous studies of stygobitic arthropods (beetles, amphipods and isopods) from the Yilgarn region and reinforce the usefulness of using DNA-sequence data to investigate species boundaries and the presence of cryptic species.

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20

Carr, Lidena, Russell Korsch, Arthur Mory, Roger Hocking, Sarah Marshall, Ross Costelloe, Josef Holzschuh, and Jenny Maher. "Structural and stratigraphic architecture of Australia's frontier onshore sedimentary basins: the Western Officer and Southern Carnarvon basins, Western Australia." APPEA Journal 52, no. 2 (2012): 670. http://dx.doi.org/10.1071/aj11084.

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During the past five years, the Onshore Energy Security Program, funded by the Australian Government and conducted by Geoscience Australia, in conjunction with state and territory geological surveys, has acquired deep seismic reflection data across several frontier sedimentary basins to stimulate petroleum exploration in onshore Australia. This extended abstract presents data from two seismic lines collected in Western Australia in 2011. The 487 km long Yilgarn-Officer-Musgrave (YOM) seismic line crossed the western Officer Basin in Western Australia, and the 259 km long, Southern Carnarvon Seismic line crossed the Byro Sub-basin of the Southern Carnarvon Basin. The YOM survey imaged the Neoproterozoic to Devonian western Officer Basin, one of Australia's underexplored sedimentary basins with hydrocarbon potential. The survey data will also provide geoscientific knowledge on the architecture of Australia's crust and the relationship between the eastern Yilgarn Craton and the Musgrave Province. The Southern Carnarvon survey imaged the onshore section of the Ordovician to Permian Carnarvon Basin, which offshore is one of Australia's premier petroleum-producing provinces. The Byro Sub-basin is an underexplored depocentre with the potential for both hydrocarbon and geothermal energy. Where the seismic traverse crossed the Byro Sub-basin it imaged two relatively thick half graben, on west dipping bounding faults. Structural and sequence stratigraphic interpretations of the two seismic lines are presented in this extended abstract.

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21

Rice, Clive M., Mark D. Welch, John W. Still, Alan J. Criddle, and Chris J. Stanley. "Honeaite, a new gold-thallium-telluride from the Eastern Goldfields, Yilgarn Craton, Western Australia." European Journal of Mineralogy 28, no. 5 (January 24, 2016): 979–90. http://dx.doi.org/10.1127/ejm/2016/0028-2559.

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22

Jones, Tim, Malcolm Nicoll, James Goodwin, and Terry Brennan. "3D Geological Model of the Yilgarn-Officer-Musgrave (YOM) Region." ASEG Extended Abstracts 2013, no. 1 (December 2013): 1–3. http://dx.doi.org/10.1071/aseg2013ab207.

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23

Neil Phillips, G., and J. R. Vearncombe. "Exploration of the Yandal gold province, Yilgarn Craton, Western Australia." Applied Earth Science 120, no. 1 (March 2011): 44–59. http://dx.doi.org/10.1179/1743275811y.0000000012.

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24

Occhipinti, Sandra, Roger Hocking, Mark Lindsay, Alan Aitken, Iain Copp, Julie Jones, Stephen Sheppard, Franco Pirajno, and Vaclav Metelka. "Paleoproterozoic basin development on the northern Yilgarn Craton, Western Australia." Precambrian Research 300 (October 2017): 121–40. http://dx.doi.org/10.1016/j.precamres.2017.08.003.

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25

Hallberg, J. A., and C. W. Giles. "Archaean felsic volcanism in the northeastern Yilgarn Block, Western Australia." Australian Journal of Earth Sciences 33, no. 4 (December 1986): 413–27. http://dx.doi.org/10.1080/08120098608729381.

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26

Dickson, B. L. "Radium isotopes in saline seepages, south-western Yilgarn, Western Australia." Geochimica et Cosmochimica Acta 49, no. 2 (February 1985): 361–68. http://dx.doi.org/10.1016/0016-7037(85)90029-8.

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27

Dentith, M. C., V. F. Dent, and B. J. Drummond. "Deep crustal structure in the southwestern Yilgarn Craton, Western Australia." Tectonophysics 325, no. 3-4 (October 2000): 227–55. http://dx.doi.org/10.1016/s0040-1951(00)00119-0.

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28

Aitken, A. R. A., M. Fiorentini, M. Tesauro, and N. Thébaud. "Supercontinent-paced magmatic destabilisation and recratonisation of the Yilgarn Craton." Gondwana Research 116 (April 2023): 12–24. http://dx.doi.org/10.1016/j.gr.2022.11.016.

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29

Hayman, P. C., S. E. Hull, R. A. F. Cas, E. Summerhayes, Y. Amelin, T. J. Ivanic, and D. Price. "A new period of volcanogenic massive sulfide formation in the Yilgarn: a volcanological study of theca2.76 Ga Hollandaire VMS deposit, Yilgarn Craton, Western Australia." Australian Journal of Earth Sciences 62, no. 2 (February 17, 2015): 189–210. http://dx.doi.org/10.1080/08120099.2015.1011399.

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30

Whitaker, A. "A geophysical model of the Precambrian of the Albany 1:1M sheet, Western Australia, and its relevance to economic geology." Exploration Geophysics 20, no. 2 (1989): 195. http://dx.doi.org/10.1071/eg989195.

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In the Albany 1:1M sheet, the 10-50 km wavelength gravity and aeromagnetic anomalies define major boundaries and subdivisions of the Precambrian blocks/provinces and large bodies of granite, while the short wavelength magnetic anomalies define lithological banding and lineaments. The Yilgarn Block in the sheet area is readily subdivided into two major north-northwest to north trending zones of low magnetization separated by a 30 km wide zone of high magnetization. The eastern zone is considered to be due to granite-greenstone terrane, the western boundary of which is located 100 km west of that currently recognised from outcrop geology. The western zone is considered to be due to granite-geiss terrane while the 30 km wide zone between coincides with strongly magnetised granulites. The Albany Province is composed of two structurally distinct east-west trending zones. The southern zone of relatively low magnetization and density coincides with acid gneiss and granites, whereas the highly magnetised, relatively dense zone to the north and west, correlates with highly metamorphosed acid and mafic granulites. Thrusting of the Albany Province during the Mid-Proterozoic has demagnetised and or deformed the margin of the southern Yilgarn Block to at least 50 km north of the block boundary. Throughout the region, significant mineral deposits of Au, Ni, Sn, Ti, and Fe are located within greenstone and high grade metamorphic belts. These belts have characteristic signatures which contrast with extensive areas of relatively homogeneous, low economic mineral potential, granite-gneiss terrane.

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31

Wang, Xu, Peimin Zhu, Timothy M. Kusky, Na Zhao, Xiaoyong Li, and Zhensheng Wang. "Dynamic cause of marginal lithospheric thinning and implications for craton destruction: a comparison of the North China, Superior, and Yilgarn cratons." Canadian Journal of Earth Sciences 53, no. 11 (November 2016): 1121–41. http://dx.doi.org/10.1139/cjes-2015-0110.

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We present a comparative tectonic analysis of the North China Craton (NCC), which has lost parts of its root, with the Yilgarn and Superior cratons, which preserve their roots. We compare the geophysical structure and tectonic histories of these cratons to search for reasons why some cratons lose their roots, while others retain them. Based on the comparison and analysis of geological, geophysical, and geochemical data, it is clear that the lithospheric thinning beneath craton margins is a common phenomenon, which may be caused by convergence between plates. However, craton destruction is not always accompanied by lithospheric thinning, except for cratons that suffered subduction and collision from multiple sides. The Western Block (also known as the Ordos Block) of the NCC, Yilgarn and Superior cratons have not experienced craton destruction; the common ground among them is that they are surrounded by weak zones (e.g., mobile belts or orogens) that sheltered the cratons from deformation, which contributes greatly to the long-term stability of the craton. Subduction polarity controlled the water released by the subducting plate, and if subducting plates dip underneath the craton, they release water that hydroweakens the overlying mantle, and makes it easy for delamination or sub-continental lithospheric mantle erosion to take place in the interior of the craton. Thus, subduction polarity during convergence events is an important element in determing whether a craton retains or loses its root.

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32

Byrne, Margaret. "Genetics and ecology of plant species occurring on the Banded Iron Formations in the Yilgarn, Western Australia." Australian Journal of Botany 67, no. 3 (2019): 165. http://dx.doi.org/10.1071/bt19048.

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Banded Iron Formations (BIFs) are a distinctive feature in the Yilgarn craton of southern Western Australia occurring as geographically isolated ranges within a mosaic of alluvial clay soils interspersed with sandplains and occasional granite outcrops. They are prominent features across a flat, highly weathered plateau, forming unique geologically stable components in an unglaciated landscape. The topographic complexity of BIFs provides areas of key environmental heterogeneity in a subdued landscape, offering a mosaic of habitats and abundance of niche microhabitats that support unique plant communities with high species diversity including many narrowly endemic species and those with distributions centred on these banded iron formations. Genetic and ecological studies have been undertaken on several species that are endemic to, or have distributions centred on, the banded iron formations of the Yilgarn. These studies provide a basis for understanding the diversity and evolutionary history of the plant communities that occur in these diverse environments. This Special Issue brings together studies on several these species to complement studies already published, and this overview provides a summary of the genetics and ecology of 21 species that are restricted to, or have distributions centred on, BIFs. Many of these species have conservation status under national and state legislation and understanding of genetics and ecology of these species assists with conservation strategies. A range of genetic patterns was identified among these species making generalisations difficult and indicating analysis of individual species is required in order to provide information for conservation and management decisions.

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33

Weinberg, Roberto F., and Peter van der Borgh. "Extension and gold mineralization in the Archean Kalgoorlie Terrane, Yilgarn Craton." Precambrian Research 161, no. 1-2 (February 2008): 77–88. http://dx.doi.org/10.1016/j.precamres.2007.06.013.

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34

Lascelles, D. F. "Genesis of the Koolyanobbing iron ore deposits, Yilgarn Province, WA, Australia." Applied Earth Science 116, no. 2 (June 2007): 86–93. http://dx.doi.org/10.1179/174327507x167055.

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35

Weber, U. D., B. P. Kohn, A. J. W. Gleadow, and D. R. Nelson. "Low temperature Phanerozoic history of the Northern Yilgarn Craton, Western Australia." Tectonophysics 400, no. 1-4 (May 2005): 127–51. http://dx.doi.org/10.1016/j.tecto.2005.03.008.

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36

Chen, She Fa, Walter K. Witt, and Songfa Liu. "Transpression and restraining jogs in the northeastern Yilgarn craton, Western Australia." Precambrian Research 106, no. 3-4 (March 2001): 309–28. http://dx.doi.org/10.1016/s0301-9268(00)00138-8.

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37

Currie, K. L., and P. R. Williams. "An Archean calc-alkaline lamprophyre suite, northeastern Yilgarn Block, western Australia." Lithos 31, no. 1-2 (October 1993): 33–50. http://dx.doi.org/10.1016/0024-4937(93)90031-7.

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38

McLean, R. "Register of Australian winter cereal cultivars. . Avena sativa (oats) cv. Yilgarn." Australian Journal of Experimental Agriculture 34, no. 5 (1994): 708. http://dx.doi.org/10.1071/ea9940708.

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39

Pidgeon, R. T., and A. A. Nemchin. "1.2 Ga Mafic dyke near York, southwestern Yilgarn Craton, Western Australia." Australian Journal of Earth Sciences 48, no. 5 (October 2001): 751. http://dx.doi.org/10.1046/j.1440-0952.2001.00895.x.

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Pidgeon, R. T., and A. A. Nemchin. "1.2 Ga Mafic dyke near York, southwestern Yilgarn Craton, Western Australia." Australian Journal of Earth Sciences 48, no. 5 (October 2001): 751–55. http://dx.doi.org/10.1046/j.1440-0952.2001.485895.x.

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41

Anand, R. R., and M. Paine. "Regolith geology of the Yilgarn Craton, Western Australia: Implications for exploration." Australian Journal of Earth Sciences 49, no. 1 (February 2002): 3–162. http://dx.doi.org/10.1046/j.1440-0952.2002.00912.x.

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42

Craig, M. A. "Regolith mapping for geochemical exploration in the Yilgarn Craton, Western Australia." Geochemistry: Exploration, Environment, Analysis 1, no. 4 (November 2001): 383–90. http://dx.doi.org/10.1144/geochem.1.4.383.

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43

Butt, C. R. M. "Granite weathering and silcrete formation on the Yilgarn Block, Western Australia." Australian Journal of Earth Sciences 32, no. 4 (December 1985): 415–32. http://dx.doi.org/10.1080/08120098508729341.

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44

Calvert, Andrew J., and Michael P. Doublier. "Archaean continental spreading inferred from seismic images of the Yilgarn Craton." Nature Geoscience 11, no. 7 (June 4, 2018): 526–30. http://dx.doi.org/10.1038/s41561-018-0138-0.

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45

Downes, P. J., and A. W. R. Bevan. "Chrysoberyl, beryl and zincian spinel mineralization in granulite-facies Archaean rocks at Dowerin, Western Australia." Mineralogical Magazine 66, no. 6 (December 2002): 985–1002. http://dx.doi.org/10.1180/0026461026660072.

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Abstract A deposit of chrysoberyl (BeAl2O4), including the variety alexandrite, occurs near Dowerin, in the southwestern region of the Archaean Yilgarn Craton, Western Australia. The deposit is situated in the northern part of the Lake Grace Terrain, a crustal component of the southwestern Yilgarn Craton, in granulite-facies gneisses (2640–2649 Ma; T = 700°C, P <6 kbar) adjacent to the margin of the Kellerberrin Batholith (2587±25 Ma). Beryllium mineralization at Dowerin occurs in plagioclase-quartz-biotite-garnet gneiss and cross-cutting tourmaline-plagioclase veins situated adjacent to lenses of actinolite-cummingtonite-phlogopite schist. Crystals of chrysoberyl (0.15–1.74 wt.% Cr2O3; 2.25–3.23 wt.% FeO; trace–0.13 wt.% ZnO; SiO2 <0.05 wt.%) are found embedded in almandine or plagioclase, and closely intergrown with biotite and/or zincian hercynite in the host-rock gneiss. Minor Cr and Fe in the alexandrite variety of chrysoberyl were possibly derived from associated zincian hercynite and/or almandine. Trace beryl (0.04–0.20 wt.% Cr2O3; 0.54–0.71 wt.% FeO; trace– 0.22 wt.% Na2O; 0.1–0.71 wt.% MgO) occurs as anhedral interstital grains between crystals of chrysoberyl, plagioclase and biotite, and as rare inclusions in chrysoberyl. Textural and mineral chemical evidence suggests that chrysoberyl and zincian spinels (chromite to hercynite containing from 2–8 wt.% ZnO) formed during granulite-facies regional metamorphism and probably pre-dated the formation of metamorphic tourmaline-plagioclase veins during the same metamorphic episode. The Be, B and Zn required to form chrysoberyl, beryl, tourmaline and zincian spinels may have been released by metamorphic reactions in host-rock metapelites during prograde granulite-facies metamorphism.

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46

Petersson, Andreas, Anthony I. S. Kemp, and Martin J. Whitehouse. "A Yilgarn seed to the Pilbara Craton (Australia)? Evidence from inherited zircons." Geology 47, no. 11 (September 25, 2019): 1098–102. http://dx.doi.org/10.1130/g46696.1.

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Abstract Knowledge of the age and compositional architecture of Archean cratonic lithosphere is critical for models of geodynamics and continental growth on early Earth, but can be difficult to unravel from the exposed geology. We report the occurrence of numerous >3.7 Ga zircon crystals in 3.45 Ga rhyolites of the eastern Pilbara Craton (Western Australia), which preserve evidence for an Eoarchean meta-igneous component in the deep Pilbara crust. This inherited zircon population shares similar and distinctive age and Hf-O isotope characteristics with the oldest gneissic components of the Yilgarn Craton ∼500 km farther south, suggesting a common ca. 3.75 Ga felsic crustal nucleus to these two Archean granite-greenstone terranes. We infer a pivotal role for such ‘seeds’ in facilitating the growth and persistence of Archean continental lithosphere.

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Barranco, Pablo, and Mark S. Harvey. "The first indigenous palpigrade from Australia: a new species of Eukoenenia (Palpigradi:Eukoeneniidae)." Invertebrate Systematics 22, no. 2 (2008): 227. http://dx.doi.org/10.1071/is07031.

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We present a description of the first indigenous member of the arachnid order Palpigradi from Australia. Eukoenenia guzikae, sp. nov. was collected from subterranean environments in the Yilgarn region of Western Australia. The sole male specimen differs from all other members of the genus in several small but significant ways, including by the combined presence of six blades in the prosomal lateral organs, nine pairs of setae on the propeltidium, the presence of a spur on coxa IV, the chaetotaxy of sternites IV–VIII, and the shape of the male genital lobes. It shows some similarities in the male genital region to a group of species found in Madagascar.

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Hill, R. I., B. W. Chappell, and I. H. Campbell. "Late Archaean granites of the southeastern Yilgarn Block, Western Australia: age, geochemistry, and origin." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 83, no. 1-2 (1992): 211–26. http://dx.doi.org/10.1017/s0263593300007902.

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ABSTRACTLate Archaean granitic rocks from the southern Yilgarn Craton of Western Australia have a close temporal relationship to the basaltic and komatiitic volcanism which occurs within spatially associated greenstone belts. Greenstone volcanism apparently began ∼2715 Ma ago, whereas voluminous felsic magmatism (both extrusive and intrusive) began about 2690 Ma ago. A brief but voluminous episode of crust-derived magmatism ∼2690-2685 Ma ago resulted in the emplacement of a diverse assemblage of plutons having granodioritic, monzogranitic and tonalitic compositions. This early felsic episode was followed immediately by the emplacement of mafic sills, and, after a further time delay, by a second episode of voluminous crust-derived magmatism dominated by monzogranite but containing plutons covering a wide compositional range, including diorite, granodiorite and tonalite. The products of this 2665–2660 Ma magmatic episode now form a significant fraction of the exposed southern Yilgarn Craton. Later magmatism, which continued to at least 2600 Ma ago, appears largely restricted to rocks having unusually fractionated compositions.The magmatic sequence basalt-voluminous crust-derived magmatism-later diverse magmatism, is interpreted in terms of a dynamically-based model for the ascent of the head of a new mantle plume. In this model basalts and komatiites are derived by decompression melting of rising plume material, and the crust-derived magmas result after conductive transport of heat from the top of the plume head into overlying continental crust. This type of magmatic evolution, the fundamentally bimodal nature of the magmatism, the presence of high-Mg volcanics (komatiites), and the areal extent of the late Archaean magmatic event, are all suggested to be characteristic of crustal reworking above mantle plumes rather than resulting from other processes, such as those related to subduction.

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Choi, Eunjoo, Marco L. Fiorentini, Andrea Giuliani, Stephen F. Foley, Roland Maas, and Stuart Graham. "Petrogenesis of Proterozoic alkaline ultramafic rocks in the Yilgarn Craton, Western Australia." Gondwana Research 93 (May 2021): 197–217. http://dx.doi.org/10.1016/j.gr.2021.01.011.

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50

Smyth, Erica L., and Douglas M. Barrett. "Geophysical Characteristics of the Tertiary Palaeochannels in the Yilgarn Block, Western Australia." Exploration Geophysics 25, no. 3 (September 1994): 171. http://dx.doi.org/10.1071/eg994171a.

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Journal articles on the topic 'Yilgarn'

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