Browsing by Author "Burrows, MA"
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- ItemHolocene Climate across the ITCZ, Hainan Maar Lake records vs. NE Queensland(International Union for Quaternary Research (INQUA), 2019-07-26) Heijnis, H; Yan, H; Dodson, JR; Burrows, MA; Wenchao, ZThe Asian/Australian monsoon is a coupled climate system through the cross-equatorial flow over the tropical Pacific-Indian Ocean and the migration of the Inter-tropical Convergence Zone (ITCZ). We present differences and correlations between a key sites from Hainan Island (China) and the Atherton tablelands, NE Queensland (Australia). Both sites have good chronological control and have been analysed using high resolution micro- XRF. We aim to explain the significance of the 9.2 ka, the 8.2 ka, the 2.8 ka and the Little Ice Age climate events in both regional and global context and its significance on the Asian/Australian monsoon system. The following geochemical proxies including the ratios of Rb/Sr, Rb/K, Zr/Rb and Si/Ti were analysed using an X-ray fluorescence (XRF) core scanner.
- ItemA new late Quaternary palaeohydrological record from the humid tropics of northeastern Australia(Elsevier, 2016-06-01) Burrows, MA; Heijnis, H; Gadd, PS; Haberle, SGHigh resolution X-ray fluorescence (XRF) is presented as a robust palaeoclimatic proxy, suitable for use on Late Pleistocene to Holocene sediments located in a volcanic crater on the Atherton Tableland in northeastern Queensland, Australia. The proxy allows identification of wet and dry shifts in a complex sedimentary sequence comprised of peat, gyttja, laminated organic rich muds and fine clastic silt-rich sediments. Significant correlation is found between the XRF record and other proxies including magnetic susceptibility, humification, grain size, macrocharcoal, δ13C and C/N and pollen. Sixteen wetter periods are identified in the 37 ka sedimentary record for Bromfield Swamp. Three wetter periods commence in late Marine Isotope Stage 3, nine in the early glacial, one in the late de-glacial and four in Holocene. Nineteen drier periods are identified, four in late MIS 3, seven in the early glacial, one during the LGM, one in the late de-glacial period and six in the Holocene. The XRF record for Bromfield Swamp is specifically used to identify periods of abrupt climate change. Marked changes in effective precipitation are detected at 32,690, 30,080, 24,660, 21,870, 11,880, 10,020, 9170 and 5120 cal. yr BP. The detection of these abrupt climate events may allow correlation with records from terrestrial sites across the Southern Hemisphere and potentially, the Northern Hemisphere. © 2016 Elsevier B.V.
- ItemTracking abrupt climatic changes of the Holocene using organic sediments from NE Australia(International Union for Quaternary Research (INQUA), 2019-07-30) Burrows, MA; Heijnis, H; Haberle, SG; Gadd, PSSediment cores recovered from Bromfield maar provide a continuous, high resolution record of climate variability through the Holocene for northeastern Australia. X-ray fluorescence (XRF-Itrax) is used in the generation of a long-term record of relative precipitation, supported by a suite of established proxies including humification, macrocharcoal and pollen. Together, these proxy data allow precise identification of wet and dry shifts in a sedimentary sequence comprised of laminated organic-rich muds, gyttja and peat. In this presentation we describe and provide new interpretations on changes in the Early Holocene as recorded at Bromfield maar, with particular emphasis on laminated organic-rich muds at 4.80m (9.2 ka) and 4.42m (8.3 ka). Additional changes are detected in the Late Holocene peat sequence at 1.37m (2.9 ka) and 1.28m (1.5 ka). Abrupt climate change events as identified in this study are significant as they allow the correlation of sedimentary records from sites throughout the wet tropics of Australia. The detection of these abrupt climate events also signals possible correlation with records from terrestrial sites across the Southern Hemisphere and potentially, the Northern Hemisphere. Such correlations may prove useful in demonstrating teleconnections, linking climates at a global scale.