Researcher Database

Last Updated :2019/05/22

Researcher Profile and Settings


Affiliation & Job

  • Section

    Faculty of Science


Academic & Professional Experience

  • 20000000, 20020000, Research assistant, The University of Hong Kong, China

Research Activities

Book, papers, etc

Published Papers

  • Magnetic properties and paleomagnetism of Zebra Rock, Western Australia: Chemical remanence acquisition in hematite pigment and Ediacaran geomagnetic field behavior, Alexandra Abrajevitch, Brad J Pillans, Andrew P Roberts, Kazuto Kodama, Geochemistry, Geophysics, Geosystems, 19, 3, 732, 748, 20180000, 10.1002/2017GC007091
  • Editorial: Magnetic Records of Extreme Geological Events, Font Eric, Abrajevitch Alexandra, Florindo Fabio, FRONTIERS IN EARTH SCIENCE, 4, 20161108, 2296-6463, 10.3389/feart.2016.00094
  • Magnetic properties of iron minerals produced by natural iron- and manganese-reducing groundwater bacteria, Abrajevitch Alexandra, Kondratyeva Lubov M., Golubeva Evgeniya M., Kodama Kazuto, Hori Rie S., GEOPHYSICAL JOURNAL INTERNATIONAL, 206, 2, 1340, 1351, 20160800, 0956-540X, 10.1093/gji/ggw221
  • Mercury anomaly, Deccan volcanism and the end-Cretaceous Mass Extinction, Font Eric, Adatte Thierry, Keller Gerta, Abrajevitch Alexandra, Sial Alcides Nobrega, de Lacerda Luiz Drude, Punekar Jahnavi, GEOLOGY, 44, 3, 20160300, 0091-7613, 10.1130/G37717Y.1
  • Tracing acidification induced by Deccan Phase 2 volcanism, Font Eric, Ponte Jorge, Adatte Thierry, Fantasia Alicia, Florindo Fabio, Abrajevitch Alexandra, Mirao Jose, PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 441, 181, 197, 20160101, 0031-0182, 10.1016/j.palaeo.2015.06.033
  • Asteroid impact vs. Deccan eruptions: The origin of low magnetic susceptibility beds below the Cretaceous-Paleogene boundary revisited, Abrajevitch Alexandra, Font Eric, Florindo Fabio, Roberts Andrew P., EARTH AND PLANETARY SCIENCE LETTERS, 430, 209, 223, 20151115, 0012-821X, 10.1016/j.epsl.2015.08.022
  • A new paleoprecipitation proxy based on soil magnetic properties: Implications for expanding paleoclimate reconstructions, Hyland Ethan G., Sheldon Nathan D., Van der Voo Rob, Badgley Catherine, Abrajevitch Alexandra, GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 127, 7-8, 975, 981, 20150700, 0016-7606, 10.1130/B31207.1
  • Haematite pigmentation events and palaeomagnetic recording: implications from the Pilbara Print Stone, Western Australia, Abrajevitch Alexandra, Pillans Brad J., Roberts Andrew P., GEOPHYSICAL JOURNAL INTERNATIONAL, 199, 2, 658, 672, 20141100, 0956-540X, 10.1093/gji/ggu293
  • Volcanic iron fertilization of primary productivity at Kerguelen Plateau, Southern Ocean, through the Middle Miocene Climate Transition, Abrajevitch Alexandra, Roberts Andrew P., Kodama Kazuto, PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 410, 1, 13, 20140915, 0031-0182, 10.1016/j.palaeo.2014.05.028
  • Quantifying magnetite magnetofossil contributions to sedimentary magnetizations, Heslop David, Roberts Andrew P., Chang Liao, Davies Maureen, Abrajevitch Alexandra, De Deckker Patrick, EARTH AND PLANETARY SCIENCE LETTERS, 382, 58, 65, 20131115, 0012-821X, 10.1016/j.epsl.2013.09.011
  • Rock magnetic record of the Triassic-Jurassic transition in pelagic bedded chert of the Inuyama section, Japan, Abrajevitch Alexandra, Hori Rie S., Kodama Kazuto, GEOLOGY, 41, 7, 803, 806, 20130700, 0091-7613, 10.1130/G34343.1
  • Unraveling the early-middle Paleozoic paleogeography of Kazakhstan on the basis of Ordovician and Devonian paleomagnetic results, Bazhenov Mikhail L., Levashova Natalia M., Degtyarev Kirill E., Van der Voo Rob, Abrajevitch Alexandra V., McCausland Phil J. A., GONDWANA RESEARCH, 22, 3-4, 974, 991, 20121100, 1342-937X, 10.1016/
  • Palaeomagnetism of the West Sakhalin Basin: evidence for northward displacement during the Cretaceous, Abrajevitch Alexandra, Zyabrev Sergey, Didenko Alexei N., Kodama Kazuto, GEOPHYSICAL JOURNAL INTERNATIONAL, 190, 3, 1439, 1454, 20120900, 0956-540X, 10.1111/j.1365-246X.2012.05572.x
  • The similar to 270 Ma palaeolatitude of Baltica and its significance for Pangea models, Dominguez Ada R., Van der Voo Rob, Torsvik Trond H., Hendriks Bart W. H., Abrajevitch Alexandra, Domeier Mathew, Larsen Bjorn T., Rousse Sonia, GEOPHYSICAL JOURNAL INTERNATIONAL, 186, 2, 529, 550, 20110800, 0956-540X, 10.1111/j.1365-246X.2011.05061.x
  • Diagenetic sensitivity of paleoenvironmental proxies: A rock magnetic study of Australian continental margin sediments, Abrajevitch Alexandra, Kodama Kazuto, GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 12, 20110503, 1525-2027, 10.1029/2010GC003481
  • Magnetization carriers and remagnetization of bedded chert, Abrajevitch Alexandra, Hori Rie S., Kodama Kazuto, EARTH AND PLANETARY SCIENCE LETTERS, 305, 1-2, 135, 142, 20110501, 0012-821X, 10.1016/j.epsl.2011.02.047
  • Incompatible Ediacaran paleomagnetic directions suggest an equatorial geomagnetic dipole hypothesis, Abrajevitch Alexandra, Van der Voo Rob, EARTH AND PLANETARY SCIENCE LETTERS, 293, 1-2, 164, 170, 20100415, 0012-821X, 10.1016/j.epsl.2010.02.038
  • Variations in relative abundances of goethite and hematite in Bengal Fan sediments: Climatic vs. diagenetic signals, Abrajevitch Alexandra, Van der Voo Rob, Rea David K., MARINE GEOLOGY, 267, 3-4, 191, 206, 20091215, 0025-3227, 10.1016/j.margeo.2009.10.010
  • Biochemical vs. detrital mechanism of remanence acquisition in marine carbonates: A lesson from the K-T boundary interval, Abrajevitch Alexandra, Kodama Kazuto, EARTH AND PLANETARY SCIENCE LETTERS, 286, 1-2, 269, 277, 20090830, 0012-821X, 10.1016/j.epsl.2009.06.035
  • Paleomagnetism of mid-Paleozoic subduction-related volcanics from the Chingiz Range in NE Kazakhstan: The evolving paleogeography of the amalgamating Eurasian composite continent, Levashova Natalia M., Van der Voo Rob, Abrajevitch Alexandra V., Bazhenov Mikhail L., GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 121, 3-4, 555, 573, 20090300, 0016-7606, 10.1130/B26354.1
  • The role of the Kazakhstan orocline in the late Paleozoic amalgamation of Eurasia, Abrajevitch Alexandra, Van der Voo Rob, Bazhenov Mikhail L., Levashova Natalia M., McCausland Phil J. A., TECTONOPHYSICS, 455, 1-4, 61, 76, 20080718, 0040-1951, 10.1016/j.tecto.2008.05.006
  • Paleornagnetic constraints on the paleogeography and oroclinal bending of the Devonian volcanic arc in Kazakhstan, Abrajevitch Alexandra, Van der Voo Rob, Levashova Natalia M., Bazhenov Mikhail L., TECTONOPHYSICS, 441, 1-4, 67, 84, 20070815, 0040-1951, 10.1016/j.tecto.2007.04.008

Conference Activities & Talks

  • Magnetic and mercury anomalies at the Paleocene-Eocene Thermal Maximum (PETM): environmental acidification and the role of volcanism, M Andrade, E Font, T Adatte, H Khozyem, A Abrajevitch, EGU General Assembly Conference, 20180409


  • Neotethys and the India-Asia collision: Insights from a palaeomagnetic study of the Dazhuqu ophiolite, southern Tibet, Alexandra V. Abrajevitch, Alexandra V. Abrajevitch, Jason R. Ali, Jonathan C. Aitchison, Badengzhu, Aileen M. Davis, Jianbing Liu, Jianbing Liu, Sergey V. Ziabrev, Earth and Planetary Science Letters, 233, 87, 102, 20050430, 0012821X, 10.1016/j.epsl.2005.02.003,, Since 1999, independently derived geophysical and geological models have been published arguing for an intra-oceanic subduction system along essentially the entire width of the India-Eurasia collision belt. This idea conflicts with earlier proposals, where in the eastern part of the convergence zone Neotethyan mid-ocean ridge-generated lithosphere directly north of the Indian craton was consumed beneath Eurasia in Tibet in an Andean-type plate configuration. New palaeomagnetic data are reported from three Barremian-Aptian (∼ 120 Ma) sequences of chert, siliceous mudstones and volcaniclastic rocks. These rocks form the uppermost part of the Dazhuqu supra-subduction zone ophiolite terrane, which crop out along substantial portions of the India-Eurasia (= Yarlung Tsangpo) suture zone in southern Tibet. The declination data provide little regionally-useful tectonic information; they are dominated by local rotations, presumably related to the Dazhuqu terrane's initial obduction onto the India plate in the Palaeocene and subsequent movement(s) as India later collided and indented into Eurasia. The inclination data are, however, useful because they yield consistent sub-equatorial formation sites (2.7 °S ± 3.0°, 7.9 °N ± 2.7°, 1.4 °N ± 5.7°), which correspond with the location of the Neotethyan intra-oceanic subduction system inferred from the seismic tomographic data. At the time these Dazhuqu terrane rocks formed, the intra-Tethyan subduction zone would have been about 2500 km south of Eurasia. © 2005 Elsevier B.V. All rights reserved.
  • Stratigraphic and sedimentological constraints on the age and tectonic evolution of the Neotethyan ophiolites along the Yarlung Tsangpo suture zone, Tibet, Jonathan C. Aitchison, Aileen M. Davis, Alexandra V. Abrajevitch, Jason R. Ali, Badengzhu, Jianbing Liu, Hui Luo, Isabella R.C. McDermid, Sergey V. Ziabrev, Geological Society Special Publication, 218, 147, 164, 20040623, 03058719, 10.1144/GSL.SP.2003.218.01.09,, Ophiolitic rocks distributed along the Yarlung Tsangpo suture zone in southern Tibet are the few remaining fragmentary remnants of many thousands of kilometres of the ocean space that formerly existed between India and Eurasia. Portions of mid-Jurassic and mid-Cretaceous intra-oceanic island arcs can be recognized amongst those rocks that have been studied in detail. Complete suprasubduction zone ophiolite successions are preserved in the Dazhuqu terrane, which crops out both east and west of Xigaze. Radiolarians in inter-pillow cherts and immediately overlying sedimentary rocks indicate a Barremian ophiolite generation event. Palaeomagnetic data show that this ophiolite formed at equatorial latitudes south of the Lhasa terrane before its south-directed emplacement onto the northern margin of India. Highly refractory ultramafic rocks in the Luobusa ophiolite appear to be of Mid-Jurassic age and are potentially related to intra-oceanic island arc remnants in the nearby Zedong terrane. Ophiolitic massifs along the suture in western Tibet are thrust southwards onto northern India and record Late Jurassic ocean-floor development. Miocene north-directed back-thrusting associated with India-Asia collision has further complicated interpretation of regional geology. The ophiolitic rocks of the Yarlung Tsangpo suture zone provide evidence for the former existence of multiple oceanic island arc segments within Neotethys and suggest that consumption of the oceanic space between India and Asia was more complicated than has been predicted by existing models. © The Geological Society of London 2003.
  • Bainang Terrane, Yarlung-Tsangpo suture, southern Tibet (Xizang, China): A record of intra-Neotethyan subduction-accretion processes preserved on the roof of the world, Sergey V. Ziabrev, Jonathan C. Aitchison, Alexandra V. Abrajevitch, Badengzhu, Aileen M. Davis, Hui Luo, Journal of the Geological Society, 161, 523, 538, 20040501, 00167649, 10.1144/0016-764903-099,, The Bainang terrane, an intra-oceanic island are subduction complex into which Tethyan oceanic rocks were accreted during the Cretaceous, is preserved within the Yarlung-Tsangpo suture zone of Tibet. The lithostratigraphic succession established from field mapping records a long history of sedimentation in different portions of the central Tethyan domain from Late Triassic to mid-Cretaceous time. These rocks are preserved within a south-verging imbricate thrust stack of thin (≪ 1 km thick) northward younging tectonic slices. Five lithotectonic units were mapped in the terrane and these units are assigned to two distinct tracts. The northern tract, which accumulated on the north side of Neotethys, was probably separated from its southern counterpart by a mid-ocean ridge. Detailed radiolarian biostratigraphy is used to constrain the timing of depositional events within each tract. Oceanic plate stratigraphy of the northern tract records its northward travel and mid-Cretaceous (late Aptian) approach towards a south-facing intra-oceanic subduction zone. Rocks in the southern tract developed closer to the Indian subcontinent and experienced thermotectonic subsidence and Mid-Jurassic basic alkaline intraplate magmatism. They were probably accreted late in the Cretaceous. Variations in structural style across the terrane indicate deformation at different depths and vertical growth of the wedge rather than lateral accretion. The overall tectonostratigraphy of the terrane reflects its development in a remote intra-oceanic setting.
  • First Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implications, Jason R. Ali, David J. Ward, David J. Ward, Chris King, Chris King, Alexandra Abrajevitch, Geophysical Journal International, 154, 463, 470, 20030801, 0956540X, 10.1046/j.1365-246X.2003.01974.x,, A palaeomagnetic investigation of lower Eocene (ca. 52 Ma) London Clay Formation cemented mudstones from Sheppey (SE England) has yielded a mean direction of Dec. = 1.1°, Inc. = 43.2°, where N = 9, α95 = 6.8° and K = 58.5. This apparently high-quality direction (Q-factor = 5) has an associated palaeopole of 178.6°E, 63.7°N, where A95 = 6.8°. The data represent the first pole from post Jurassic stable Eurasia rocks outside of the European North Atlantic Igneous Province (NAIP), of which most results have been obtained from NW Britain and the Faroe Islands. The data can in part be used to constrain the position of Palaeogene Eurasia, in particular the zero-offset declination implying negligible rotation of western Eurasia since the early Cenozoic. This is in contrast with data derived from the European NAIP, which imply small to moderate clockwise rotations for this part of the plate. The inclination angle may provide less useful information as it appears to be anomalously shallow when compared with that associated with the NAIP derived poles. In an attempt to understand the shallowing, we re-examined data from Palaeocene-Eocene sediments recovered in several boreholes (bathyal sediments in DSDP Hole 550, four cores through fluvio-delatic to middle shelf sequences in the London area, and one borehole sequence from East Anglia). In all cases, the sediments show systematic inclination shallowing similar in magnitude to that reported from Sheppey. Tectonic and geomagnetic explanations can be discounted; sediment compaction appears to be the likely cause. In light of the current controversy surrounding the 'stable Asia shallow inclination problem', the result reinforces the suggestion that tectonic modelling needs to be done carefully when the supporting data are based exclusively on palaeomagnetic studies of sedimentary rocks.
  • Precise radiolarian age constraints on the timing of ophiolite generation and sedimentation in the Dazhuqu terrane, Yarlung-Tsangpo suture zone, Tibet, Sergey V. Ziabrev, Jonathan C. Aitchison, Alexandra V. Abrajevitch, Badengzhu, Aileen M. Davis, Hui Luo, Hui Luo, Journal of the Geological Society, 160, 591, 599, 20030701, 00167649, 10.1144/0016-764902-107,, Well-preserved, abundant radiolarians provide high-precision biostratigraphic age constraints on the timing of the eruption of ophiolitic basalts exposed along the Yarlung-Tsangpo suture zone in southern Tibet. Dazhuqu terrane ophiolites were generated in an intra-oceanic supra-subduction zone setting within a relatively short (<10 Ma) interval from late Barremian to late Aptian. Accumulation of sediments upon the newly generated ophiolite initially occurred in a series of discrete rift-controlled sub-basins associated with various spreading centres. An increasing flux of arc-derived volcaniclastic sediment up-section indicates nearby volcanic are activity. The Dazhuqu terrane developed in an intra-oceanic setting within Tethys where it was isolated from any continental influence.
  • New insights into the evolution of the Yarlung Tsangpo suture zone, Xizang (Tibet), China, Jonathan C. Aitchison, A. Abrajevitch, J. R. Ali, Badengzhu, A. M. Davis, H. Luo, J. B. Liu, I. R.C. McDermid, S. Ziabrev, Episodes, 25, 90, 94, 20020601, 07053797,, Detailed investigations along the Yarlung Tsangpo suture zone, Tibet result in the following conclusions. (1) Arc, forearc, and subduction complex elements of at least one intra-oceanic island arc which once lay within Tethys and accreted to India prior to its collision with Asia are preserved within the suture. (2) Collision-related tectonic mélange is widespread. (3) Temporally distinct conglomeratic molasse units were developed; they are related to different collision events. (4) Improved radiolarian fossil data place constraints on timing of the development of intra-oceanic terranes and mélange formation. (5) A simple unconformable contact occurs between Upper Oligocene-Lower Miocene conglomerates and the southern Lhasa terrane; the so-called south-directed "Gangdese thrust" does not exist. These new results suggest the former existence of an intra-oceanic subduction system within Tethys and indicate that considerable revision of existing models for the evolution of the Yarlung Tsangpo suture zone is required.

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