wilkes land antarctica

Smits, R. G., Collins, W. J., Hand, M., Dutch, R. & Payne, J. Department for Energy and Mining, South Australia, Adelaide (2018). It was discovered in 1840 by the French explorer Jules-Sbastien-Csar Dumont d'Urville, who . Correspondence to Lithos 113, 570582, https://doi.org/10.1016/j.lithos.2009.06.028 (2009). S1). Most 19th-century maps of Antarctica do not recognize Wilkes's remarkable 1840 feat. Although Wilkes's primary charge was to return with information that could give the United States an advantage over other nations in hunting whales and seals, the longest lasting benefit of this expedition was the scientific information brought back to the United States. Therefore, that information is unavailable for most Encyclopedia.com content. Publishers note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Fingerprinting Proterozoic Bedrock in Interior Wilkes Land, East Antarctica. Article Zircon chemistry and magma mixing, SE China: In-situ analysis of Hf isotopes, Tonglu and Pingtan igneous complexes. Render date: 2023-07-08T06:13:58.192Z ." 3c) with oscillatory (e.g. Twenty-four Hf isotope analyses of concordant primary igneous zircon grains yield initial 176Hf/177Hf (Hfi) ratios in the range 0.282060.28216 (Fig. Rare monazite typically occurs as irregular grains (~1550m) amongst the fine-grained interstitial muscovite (Fig. Casey was named in honour of Richard, Baron Casey. (Geological Survey of Western Australia, 2011). Comment: Hf-isotope heterogeneity in zircon 91500. A.M. is supported by an Australian Government Research Training Program (RTP) Scholarship. But as China scholar Anne-Marie Brady has documented extensively, Beijing views Antarctica as the last great terrestrial frontier on Earth, hosting great deposits of coal, natural gas, precious minerals, added to plentiful fish stocks in the surrounding ocean and even vast freshwater reserves locked up in Antarctic ice. Jagodzinski, E. A. We suggest granitic source rocks of these ages and isotopic compositions contribute to the main detrital zircon signature in Neoproterozoic sedimentary rocks in the Sabrina Sedimentary Basin and indicate a predominantly local derivation of sediments from the Banzare and Nuyina provinces and/or Australian equivalent basement provinces. Before this American expedition, only small, rocky outcrops of Antarctica had been sighted. There are also the remnants of the semi-cylindrical canvas store buildings known as Jamesway huts. Anknpfend an die Untersuchungen US-amerikanischer Glaziologen whrend des IGJ in Wilkes Land (vergl. 5) dominated by monocrystalline quartz (>95%, derived from point counting) and small proportions of K-feldspar (up to 3%). Mackintosh, A. N. et al. . Barham, M. et al. 2D gravity modelling and depth to magnetic basement estimates also reveal that large areas of the interior Wilkes Land are blanketed by the 1km-thick Sabrina Sedimentary Basin, covering an area of approximately 500,000km2,3 (Fig. At least three scientists accompanying Wilkes achieved international renown for their work and the specimens returned to the United States provided many years of fruitful work for many more researchers. Will the 21st century end with oil fields in an ice-free Wilkes Land or strip-mining in the forested . [2] Grains were mounted in 25-mm diameter epoxy discs. Under an agreement with the United States, Australia was permitted to use the station stores and supplies that remained, on condition that nothing was removed and that Australia reported annually on consumption of stores and supplies. spot 020). https://doi.org/10.1144/gsl.sp.2003.206.01.07, https://doi.org/10.1016/j.earscirev.2014.08.010, https://doi.org/10.1016/j.chemgeo.2007.07.017, https://doi.org/10.1016/j.precamres.2017.03.005, https://doi.org/10.1016/j.lithos.2017.01.029, https://doi.org/10.1016/j.precamres.2018.08.025, https://doi.org/10.1046/j.1365-2117.1996.00223.x, https://doi.org/10.1016/j.quascirev.2013.07.024, https://doi.org/10.1016/0012-8252(76)90052-0, https://doi.org/10.1016/j.precamres.2018.05.006, https://doi.org/10.1016/j.sedgeo.2012.10.008, https://doi.org/10.1016/j.lithos.2009.06.028, https://doi.org/10.1016/j.chemgeo.2007.11.005, https://doi.org/10.1016/j.gsf.2017.04.004, https://doi.org/10.1016/j.gsf.2018.04.001, https://doi.org/10.1016/j.chemgeo.2012.04.021, https://doi.org/10.1016/j.precamres.2003.12.011, https://doi.org/10.1016/j.chemgeo.2006.03.007, https://doi.org/10.1016/j.precamres.2014.05.025, https://doi.org/10.1016/j.chemgeo.2015.12.019, https://doi.org/10.1007/s00710-016-0451-5, https://doi.org/10.1016/S0024-4937(02)00082-8, http://creativecommons.org/licenses/by/4.0/, Antarctic geothermal heat flow and its implications for tectonics and ice sheets. The international glass standard NIST610 was ablated at the beginning and end of the analytical session to correct for mass bias on the 207Pb/206Pb ratio. Sabrina Land: 11533' E to 12205' E A Proterozoic Wilson cycle identified by Hf isotopes in central Australia: Implications for the assembly of Proterozoic Australia and Rodinia. Both the Coompana and Madura provinces are extensively intruded by granitic rocks of the c. 11921125Ma Moodini Supersuite17,18,19. Your email address will not be published. Google Scholar. Introduction As atmospheric CO 2 levels exceed the 400 ppm mark, our eyes naturally turn to the last time they were that high, the Pliocene, when they were estimated to be between 365 and 415 ppm (Pagani et al., 2010). 1a), as well as Neoproterozoic sedimentary rocks of the Beardmore Group in the Transantarctic Mountains36. A deep-time history of monumental scale, Land of Wondrous Cold brings the remotest of worlds within close reachan Antarctica vital to both planetary history and human fortunes. Geology 42, 231234, https://doi.org/10.1130/G35112.1 (2014). (a) Subglacial bedrock elevation map showing location of samples of this study, ice catchment basins31 (dashed black lines) and major structural lines7 (solid red lines); revised path of the Southard Fault is also shown as dotted red segment; (b) (left) Location of sampling sites at Chick Island and (right) annotated detail of backscatter electron (BSE) image of each sample; (c) glacial sandstone erratic samples used in this study. PubMedGoogle Scholar. The c. 11921125Ma Moodini Supersuite in both the Coompana and Madura provinces exhibits a distinct NE directional trend and is the source of the highest magnetic intensities (up to 400nT) in both provinces (Fig. We combine new zircon UPb and Hf isotopic data from remote Antarctic outcrops with aeromagnetic data observations from the conjugate Australian-Antarctic margins to identify two new Antarctic Mesoproterozoic basement provinces corresponding to the continuation of the Coompana and Madura provinces of southern Australia into Wilkes Land. Geostandards and Geoanalytical Research 19, 123 (1995). 1a,c). Close this message to accept cookies or find out how to manage your cookie settings. Wilkes Station was an Antarctic research station established 29 January 1957 by the United States as one of seven U.S. stations established for the International Geophysical Year (IGY) program in Antarctica. Black, L. P. et al. The Great United States Exploring Expedition of 1838-1842. and N.D. provided funding and contributed to data interpretation. Sci Rep 9, 10192 (2019). Maritati, A., Halpin, J.A., Whittaker, J.M. In the meantime, to ensure continued support, we are displaying the site without styles The Ohio State University Research Foundation Report. Dr John (Jack) Weihaupt passed away in September 2014. The formal handover ceremony took place in 'Market Square'. We name this composite tectonic boundary the Southard Fault (after Cape Southard). However, due to the limited geological samples available, we are unable to define the extent of the newly identified Neoproterozoic Sabrina Basin outside the confines of the Vanderford ice catchment region. Refer to each styles convention regarding the best way to format page numbers and retrieval dates. The Sabrina Sedimentary Basin is not exposed, although, the presence of rare glaciogenic sedimentary material along the Wilkes Land coast24,25,26 provides a unique opportunity to study this basin. In Australia, parts of the Coompana and Madura provinces are covered by extensive sedimentary basins, including the Neoproterozoic to Devonian Officer Basin (part of Centralian Superbasin)21 and the Mesozoic Bight and Cenozoic Eucla basins22,23. Later, realizing that Dumont d'Urville had logged the same date, Wilkes changed his logs to indicate the sighting took place on January 16th. Bulletin of the Geological Society of America 116, 12531279 (2004). Wilkes Land is a large district of land in eastern Antarctica, formally claimed by Australia as part of the Australian Antarctic Territory, though the validity of this claim has been placed for the period of the operation of the Antarctic Treaty, to which Australia is a signatory. UPb zircon analyses were performed in two different sessions on an Agilent 7900cs quadrupole ICPMS with a 193nm Coherent ArF gas laser and a Resonetics S-155 ablation cell at the School of Earth Sciences, University of Tasmania. The observed spread in 232Th/208Pb ages could indicate different stages of authigenic monazite formation during the Late Neoproterozoic-Cambrian; we suggest that the oldest analyses in samples PRR-21185 and PRR-27976 may be closer to the depositional age of the sandstone while the apparently younger analyses record subsequent generation(s) of post-depositional authigenic monazite formation/hydrothermal alteration. NASA National Snow and Ice Data Center Distributed Active Archive Center, https://doi.org/10.5067/AXE4121732AD. Markwitz, V. & Kirkland, C. L. Source to sink zircon grain shape: Constraints on selective preservation and significance for Western Australian Proterozoic basin provenance. Revealing ice-covered geology in this region is critical to understanding the assembly and breakup of the Nuna/Columbia, Rodinia and Gondwana supercontinents of which Wilkes Land was a centrepiece1,2. Science and Its Times: Understanding the Social Significance of Scientific Discovery. Data-point error ellipses are 1; (inset) annotated ESEM image (left) and FE-SEM image (right) of four representative monazite grains used for in situ UThPb dating. This time, its sparring partner is China. 4) and Hfi values between +2.17 to +3.64.

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