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Janet Hergt

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Janet Margaret Hergt
NationalityAustralian
Alma materLa Trobe University
Australian National University
OccupationGeochemist

Janet Margaret Hergtis anAustraliangeochemist.She is a Redmond Barry DistinguishedProfessorin the School ofGeography, Earth and Atmospheric Sciencesat theUniversity of Melbourne,Victoria,Australia.[1]The main focus of her research has been in thechemicalanalysis ofrocksandmineralsto explore the exquisite record ofEarthprocesses preserved within them. Hergt is best known for hergeochemicalinvestigations ofmagmatic rocksalthough she has employed similar techniques ininterdisciplinaryprojects including areas ofarchaeologicalandbiological science.[2]

Early life and education

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Hergt's earliest years were spent living ondairy farmsin rural Victoria before moving toFrankstonwhere she attended Karingal Primary School, and later Karingal High School.[citation needed]Hergt completed her undergraduate degree (BScHons) atLa Trobe UniversityinMelbournein 1983, where she was awarded the David Myers University Medal and Ian Carlyle Medal in Geology. She received anAustralian Governmentscholarship to study at theAustralian National UniversityinCanberrawhere she completed herPhDunder the joint supervision of Bruce Chappell andIan McDougall.[1]Her project involved the analysis of compositionally unusualcontinental flood basalts(magmatism on a vast scale often occurring as a precursor to continental breakup) from the Ferrar Province and her thesis is entitled 'The Origin and Evolution of theTasmanianDolerites'.[2]It was during this time that she learned to appreciate the power oftrace elementandisotopicdata retrieved from magmatic rocks.[citation needed]

Career and impact

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Throughout her career, Hergt has retained a keen interest in extracting high qualitygeochemicaldata from rocks and minerals to solve problems in the geosciences. Her work on the Tasmanian Dolerites provided arguably the first dataset that combined major element, trace element,Sr-,Nd-,Pb- andoxygenisotopedata on the same samples from a single suite offlood basalts.[3]The dataset for the Tasmanian Dolerites, together with the extreme compositions of these rocks, provided the first opportunity to test competinghypothesesabout source processes and constrain the origin of thesemagmas.[4]

Hergt secured her firstpost-doctoralresearch position in theUKin 1988 working at theOpen Universitywith Chris Hawkesworth on a range of topics including further work on flood basalt magmatism (inAntarctica,Brazil[5]andSiberia)[6]with a number of Australian and international colleagues. It was at the Open University that she also began her studies into the geochemical expression of arc rupture andback-arc basinopening in theLau Basinin theSouthwest Pacific.Hergt participated onIntegrated Ocean Drilling Program(IODP) Leg 135, identifying two mantle domains with geochemical characteristics of "Indian" or "Pacific"mid-ocean ridgebasaltsthat has aided in understanding the mantle dynamics in this region.[7]Other work from the IODP expedition demonstrated thatmagmaserupted at the earliest stages of arc rupture had the ability to tap mantle sources as well as source rocks modified by the flux of elements released from the subducting slab.[8]

Following her move to theUniversity of Melbournein 1994, Hergt's contributions have involved a wide range of international collaborators andgraduate students,and have included investigations of continental flood basalts,[9]arc magmas,[10][11]graniteformation,[12][13]ore deposits,the origin ofkimberlites[14][15][16]and processes preserved in mantlexenoliths.Hergt has also made important contributions in establishing innovativelaboratoryprotocols[17][18][19][20][21][22]and has supported the development of Iolite data visualisation software since its inception.[23][24]Most recently, her work has extended to applications of geochemistry in the biosciences[25]and archaeological science.[26][27][28]

Hergt has held a variety of senior leadership roles at the University of Melbourne, including Deputy Head of the School of Earth Sciences (2001–2004), Associate Dean-Academic Programs in the Faculty of Science (2001–2003), Head of the School of Earth Sciences (2005–2013), Deputy Dean of the Faculty of Science (2011–2013 and 2014–2017), Acting Dean of the Faculty of Science (2013–2014), Deputy Vice President then Vice President and finally President of Academic Board (2018–2020). Hergt became a Vincent Fairfax Fellow in 2018 and was recognised as a Redmond Barry Distinguished Professor in 2019.[3]

Hergt has served on a range ofadvisory boards,senior committees, review panels, and theeditorial boardsof several international journals (Chemical Geology2008–2016;Geostandards and Geoanalytical Research2000–2013; and theJournal of the Geological Society of London,2002–2007). In 2021 theGeochemical Society(USA) and theEuropean Association of Geochemistryawarded her the honorary title of Geochemistry Fellow for her contributions to the field of geochemistry.[3]

References

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  1. ^ab"Janet Hergt – President of the Academic Board at University of Melbourne".THE ORG.Retrieved30 March2021.
  2. ^ab"Janet Hergt".scholar.google.com.au.Retrieved30 March2021.
  3. ^abc"Prof Janet Hergt".findanexpert.unimelb.edu.au.Retrieved30 March2021.
  4. ^HERGT, J. M.; CHAPPELL, B. W.; McCULLOCH, M. T.; McDOUGALL, I.; CHIVAS, A. R. (1 August 1989)."Geochemical and Isotopic Constraints on the Origin of the Jurassic Dolerites of Tasmania".Journal of Petrology.30(4): 841–883.doi:10.1093/petrology/30.4.841.ISSN0022-3530.
  5. ^Hergt, J.M.; Peate, D.W.; Hawkesworth, C.J. (July 1991)."The petrogenesis of Mesozoic Gondwana low-Ti flood basalts".Earth and Planetary Science Letters.105(1–3): 134–148.Bibcode:1991E&PSL.105..134H.doi:10.1016/0012-821x(91)90126-3.ISSN0012-821X.
  6. ^Lightfoot, P. C.; Hawkesworth, C. J.; Hergt, J.; Naldrett, A. J.; Gorbachev, N. S.; Fedorenko, V. A.; Doherty, W. (June 1993)."Remobilisation of the continental lithosphere by a mantle plume: major-, trace-element, and Sr-, Nd-, and Pb-isotope evidence from picritic and tholeiitic lavas of the Noril'sk District, Siberian Trap, Russia".Contributions to Mineralogy and Petrology.114(2): 171–188.Bibcode:1993CoMP..114..171L.doi:10.1007/bf00307754.ISSN0010-7999.S2CID128945624.
  7. ^Hergt, J.M.; Hawkesworth, C.J. (May 1994), "Pb-, Sr-, and Nd-Isotopic Evolution of the Lau Basin: Implications for Mantle Dynamics during Backarc Opening",Proceedings of the Ocean Drilling Program, 135 Scientific Results,Proceedings of the Ocean Drilling Program, vol. 135, Ocean Drilling Program,doi:10.2973/odp.proc.sr.135.142.1994
  8. ^Hergt, J.M.; Farley, K.N. (May 1994), "Major Element, Trace Element, and Isotope (Pb, Sr, and Nd) Variations in Site 834 Basalts: Implications for the Initiation of Backarc Opening",Proceedings of the Ocean Drilling Program, 135 Scientific Results,Proceedings of the Ocean Drilling Program, vol. 135, Ocean Drilling Program,doi:10.2973/odp.proc.sr.135.144.1994
  9. ^BRAUNS, C. M.; HERGT, J. M.; WOODHEAD, J. D.; MAAS, R. (1 July 2000)."Os Isotopes and the Origin of the Tasmanian Dolerites".Journal of Petrology.41(7): 905–918.doi:10.1093/petrology/41.7.905.ISSN1460-2415.
  10. ^Hergt, Janet M.; Woodhead, Jon D. (October 2007)."A critical evaluation of recent models for Lau–Tonga arc–backarc basin magmatic evolution".Chemical Geology.245(1–2): 9–44.Bibcode:2007ChGeo.245....9H.doi:10.1016/j.chemgeo.2007.07.022.ISSN0009-2541.
  11. ^Woodhead, J.D.; Hergt, J.M.; Davidson, J.P.; Eggins, S.M. (October 2001)."Hafnium isotope evidence for 'conservative' element mobility during subduction zone processes".Earth and Planetary Science Letters.192(3): 331–346.Bibcode:2001E&PSL.192..331W.doi:10.1016/s0012-821x(01)00453-8.ISSN0012-821X.
  12. ^Hergt, J; Woodhead, J; Schofield, A (August 2007)."A-type magmatism in the Western Lachlan Fold Belt? A study of granites and rhyolites from the Grampians region, Western Victoria".Lithos.97(1–2): 122–139.Bibcode:2007Litho..97..122H.doi:10.1016/j.lithos.2006.12.008.ISSN0024-4937.
  13. ^Iles, Kieran A.; Hergt, Janet M.; Woodhead, Jon D.; Ickert, Ryan B.; Williams, Ian S. (March 2020)."Petrogenesis of granitoids from the Lachlan Fold Belt, southeastern Australia: The role of disequilibrium melting".Gondwana Research.79:87–109.Bibcode:2020GondR..79...87I.doi:10.1016/j.gr.2019.08.011.ISSN1342-937X.S2CID210311456.
  14. ^Paton, Chad; Hergt, Janet M.; Woodhead, Jon D.; Phillips, David; Shee, Simon R. (November 2009)."Identifying the asthenospheric component of kimberlite magmas from the Dharwar Craton, India".Lithos.112:296–310.Bibcode:2009Litho.112..296P.doi:10.1016/j.lithos.2009.03.019.ISSN0024-4937.S2CID129645827.
  15. ^Woodhead, Jon; Hergt, Janet; Phillips, Dave; Paton, Chad (November 2009)."African kimberlites revisited: In situ Sr-isotope analysis of groundmass perovskite".Lithos.112:311–317.Bibcode:2009Litho.112..311W.doi:10.1016/j.lithos.2009.03.031.ISSN0024-4937.S2CID128679944.
  16. ^Dalton, Hayden; Giuliani, Andrea; O'Brien, Hugh; Phillips, David; Hergt, Janet (October 2020). "Corrigendum to" The role of lithospheric heterogeneity on the composition of kimberlite magmas from a single field: The case of Kaavi-Kuopio, Finland "[Lithos 354–355 (2020) 105333]".Lithos.370–371: 105611.Bibcode:2020Litho.37005611D.doi:10.1016/j.lithos.2020.105611.ISSN0024-4937.
  17. ^Chappell, Bruce W.; Hergt, Janet M. (December 1989)."The use of known Fe content as a flux monitor in neutron activation analysis".Chemical Geology.78(2): 151–158.Bibcode:1989ChGeo..78..151C.doi:10.1016/0009-2541(89)90113-7.ISSN0009-2541.
  18. ^Woodhead, Jon D; Hergt, Janet M (June 1997)."Application of the 'double spike' technique to Pb-isotope geochronology".Chemical Geology.138(3–4): 311–321.Bibcode:1997ChGeo.138..311W.doi:10.1016/s0009-2541(97)00013-2.ISSN0009-2541.
  19. ^Woodhead, Jon D.; Hergt, Janet M. (July 2005)."A Preliminary Appraisal of Seven Natural Zircon Reference Materials for In Situ Hf Isotope Determination".Geostandards and Geoanalytical Research.29(2): 183–195.doi:10.1111/j.1751-908x.2005.tb00891.x.ISSN0150-5505.S2CID98471188.
  20. ^Woodhead, Jon; Swearer, Stephen; Hergt, Janet; Maas, Roland (2005)."In situ Sr-isotope analysis of carbonates by LA-MC-ICP-MS: interference corrections, high spatial resolution and an example from otolith studies".Journal of Analytical Atomic Spectrometry.20(1): 22.doi:10.1039/b412730g.ISSN0267-9477.
  21. ^Paton, Chad; Woodhead, Jon D.; Hergt, Janet M.; Phillips, David; Shee, Simon (16 November 2007)."Strontium Isotope Analysis of Kimberlitic Groundmass Perovskite via LA-MC-ICP-MS".Geostandards and Geoanalytical Research:071117031212001––.doi:10.1111/j.1751-908x.2007.00131.x.ISSN0150-5505.S2CID95072741.
  22. ^Iles, Kieran A.; Hergt, Janet M.; Sircombe, Keith N.; Woodhead, Jon D.; Bodorkos, Simon; Williams, Ian S. (May 2015)."Portrait of a reference material: Zircon production in the Middledale Gabbroic Diorite, Australia, and its implications for the TEMORA standard".Chemical Geology.402:140–152.Bibcode:2015ChGeo.402..140I.doi:10.1016/j.chemgeo.2015.02.036.ISSN0009-2541.
  23. ^Paton, Chad; Hellstrom, John; Paul, Bence; Woodhead, Jon; Hergt, Janet (2011)."Iolite: Freeware for the visualisation and processing of mass spectrometric data".Journal of Analytical Atomic Spectrometry.26(12): 2508.doi:10.1039/c1ja10172b.ISSN0267-9477.
  24. ^Paul, Bence; Paton, Chad; Norris, Ashley; Woodhead, Jon; Hellstrom, John; Hergt, Janet; Greig, Alan (2012)."CellSpace: A module for creating spatially registered laser ablation images within the Iolite freeware environment".Journal of Analytical Atomic Spectrometry.27(4): 700.doi:10.1039/c2ja10383d.ISSN0267-9477.
  25. ^Marillo-Sialer, Estephany; Black, Jay R.; Paul, Bence; Kysenius, Kai; Crouch, Peter J.; Hergt, Janet M.; Woodhead, Jon D.; Hare, Dominic J. (2020)."Construction of 3D native elemental maps for large biological specimens using LA-ICP-MS coupled with X-ray tomography".Journal of Analytical Atomic Spectrometry.35(4): 671–678.doi:10.1039/c9ja00423h.ISSN0267-9477.S2CID214102259.
  26. ^Finch, Damien; Gleadow, Andrew; Hergt, Janet; Levchenko, Vladimir A.; Fink, David (April 2019)."New developments in the radiocarbon dating of mud wasp nests".Quaternary Geochronology.51:140–154.doi:10.1016/j.quageo.2019.02.007.ISSN1871-1014.S2CID134230346.
  27. ^Finch, Damien; Gleadow, Andrew; Hergt, Janet; Levchenko, Vladimir A.; Heaney, Pauline; Veth, Peter; Harper, Sam; Ouzman, Sven; Myers, Cecilia; Green, Helen (February 2020)."12,000-Year-old Aboriginal rock art from the Kimberley region, Western Australia".Science Advances.6(6): eaay3922.Bibcode:2020SciA....6.3922F.doi:10.1126/sciadv.aay3922.ISSN2375-2548.PMC7002160.PMID32076647.
  28. ^Finch, Damien; Gleadow, Andrew; Hergt, Janet; Heaney, Pauline; Green, Helen; Myers, Cecilia; Veth, Peter; Harper, Sam; Ouzman, Sven; Levchenko, Vladimir A. (March 2021)."Ages for Australia's oldest rock paintings".Nature Human Behaviour.5(3): 310–318.doi:10.1038/s41562-020-01041-0.ISSN2397-3374.PMID33619375.S2CID232020013.
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