Minust
Olen teadur Tartu Ülikooli Geoloogia osakonnas. Minu teadustöö põhisuunaks on uurida iidsel Maal toimunud suuremastaabilisi muutusi mandrite murenemises ja toitainete ringluses veekeskkondades ning nende muudatuste mõju ookeanidele, atmosfäärile ja biosfäärile. Selle tarbeks rakendan ma iidsetesse settekivimitesse salvestunud jälgmetallide-põhiseid paleokeskkonna indikaatoreid, mille abil on võimalik taasluua mineviku keskkonnatingimusi.
Huvid
- Jälgmetallide ja toiteelmentide geokeemia
- Redokstingimused Maa ajaloos
- Murenemiskeskkonnad
- Merevaigu geokeemia
Haridus
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Filosoofiadoktor (maa- ja atmosfääriteadused), 2021
Alberta Ülikool, Kanada
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Teadusmagister (geoloogia, cum laude), 2016
Tartu Ülikool
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Bakalaureusekraad (geoloogia, cum laude), 2013
Tartu Ülikool
Teadussuunad
Jälgmetallide ja mineraalsete toiteelementide porsumine mandritel, nende transport ookeanidesse ja ladestumine setetes.
Maakera pinna redokstingimuste areng läbi Arhaikumi, Proterosoikumi ja Paleosoikumi ajaperioodide ning nende vastastikkune mõju elementide ringlusele ja elu arengule.
Setteliste fosfaatsete mineraalide teke. Mikroobide roll apatiidi nukleerumisel ja kasvul.
Murenemiskeskkonnad kui biosfäärile vajalike mineraalsete toitainete allikad ja Maa atmosfäärilise koostise arhiivid.
Merevaigulademete tekketingimuste uurimine stabiilsete isotoopide suhete ja sprektraalanalüüsi abil.
Publikatsioonid
(2021).
The Kaolinite Shuttle Links the Great Oxidation and Lomagundi Events.
Nature Communications.
(2021).
Iron Isotopes Reveal a Benthic Iron Shuttle in the Palaeoproterozoic Zaonega Formation: Basinal Restriction, Euxinia, and the Effect on Global Palaeoredox Proxies.
Minerals.
(2021).
Constraining the conditions of phosphogenesis: Stable isotope and trace element systematics of Recent Namibian phosphatic sediments.
Geochimica et Cosmochimica Acta.
(2021).
Depositional and environmental constraints on the late Neoarchean Dagushan deposit (Anshan-Benxi area, North China Craton): An Algoma-type banded iron formation.
Economic Geology.
(2021).
Iron and carbon isotope constraints on the formation pathway of iron-rich carbonates within the Dagushan Iron Formation, North China Craton.
Minerals.
(2021).
Trace Elemental Partitioning on Clays Derived from Hydrothermal Muds of the El Tatio Geyser Field, Chile.
Journal of Geophysical Research: Solid Earth.
(2020).
Oxygenated conditions in the aftermath of the Lomagundi-Jatuli Event: The carbon isotope and rare earth element signatures of the Paleoproterozoic Zaonega Formation, Russia.
Precambrian Research.
(2020).
Identifying global vs. basinal controls on Paleoproterozoic organic carbon and sulfur isotope records.
Earth-Science Reviews.
(2020).
Hydrothermally induced $^{34}$S enrichment in pyrite as an alternative explanation of the Late-Devonian sulfur isotope excursion in South China.
Geochimica et Cosmochimica Acta.
(2020).
New constraints on the onset age of the Emeishan LIP volcanism and implications for the Guadalupian mass extinction.
Lithos.
(2020).
Palaeoproterozoic oxygenated oceans following the Lomagundi–Jatuli Event.
Nature Geoscience.
(2020).
Trace metals.
Encyclopedia of Astrobiology.
(2019).
REE+Y uptake and diagenesis in recent sedimentary apatites.
Chemical Geology.
(2019).
High-CO$\\_2$, acidic and oxygen-starved weathering at the Fennoscandian Shield at the Archean-Proterozoic transition.
Precambrian Research.
(2018).
Multiple sulphur isotope records tracking basinal and global processes in the 1.98 Ga Zaonega Formation, NW Russia.
Chemical Geology.
(2018).
Authigenesis of biomorphic apatite particles from Benguela Upwelling Zone sediments off Namibia: The role of organic matter in sedimentary apatite nucleation and growth.
Geobiology.
(2018).
Distinct origins for Rovno and Baltic ambers: Evidence from carbon and hydrogen stable isotopes.
Palaeogeography, Palaeoclimatology, Palaeoecology.
(2018).
Geochemical methods help resolve a long-standing debate in amber palaeontology.
Science Trends.
(2014).
Mikrofossiilid maailma vanimates fosforiitides.
Fosfor – aegade algusest tänapäevani. Schola Geologica X. Estonian Naturalists’ Society, Tartu.
Tunnustused
University of Alberta Graduate Fellowship
Ashley & Janet Cameron Graduate Scholarship
Graduate Student Teaching Award
Vega Graduate Scholarship
Harington Paleoenvironmental Scholarship
Steve and Elaine Antoniuk Graduate Scholarship in Arctic Research in Earth and Atmospheric Sciences
Doctoral Recruitment Scholarship
Kristjan Jaagu kraadiõpe välismaal (stipendium)
Üliõpilaste Teadustööde Riiklik Konkurss
- preemia bio- ja keskkonnateaduste valdkonnas, rakenduskõrgharidusõppe ja bakalaureuseõppe üliõpilaste astmes
Teenistuskäik
Laborant/andmetöötluse spetsialist
Õppeassistent
Keskkonnakeemia spetsialist / analüütik
Ettekanded
(2021).
The origins of biodiversity: Did changing oxygen levels in the Proterozoic induce the rise of complex life?.
Seminars on Animal Ecology, Tartu, Estonia.
(2020).
Kaotatud paradiis ja keeruka elu häll: Hapnik ja päristuumsed 2 miljardit aastat tagasi.
Schola Geologica XVI: Tihedalt koos elamine, Tartu, Estonia.
(2019).
Oxygenated oceans persisted after the Lomagundi Event: Evidence from the Zaonega Formation.
2nd Geobiology Society Meeting, Banff, Canada.
(2018).
High molybdenum abundance in the ~2 Ga Zaonega Formation: Implications for seawater following the Lomagundi excursion.
Gordon research conference “Geobiology 2018,” Galveston, Texas, USA.
(2017).
Trace metal enrichment in 1.98 Ga black shales of the Zaonega Formation.
1st Geobiology Society Meeting, Banff, Canada.
(2016).
Origin of rod and dumbbell shaped phosphate precipitates in Namibian Shelf sediments.
32nd Nordic Geological Winter Meeting, Helsinki, Finland.
(2015).
Apatitic micronodules in Namibian Shelf sediments: Mineralized microbes or diagenetic precipitates?.
Goldschmidt 2015, Prague, Czechia.
(2015).
Phosphatised microstructures in ancient and modern phosphorites.
Scientific knowledge applied to the sustainable use of coastal upwelling ecosystems, Swakopmund, Namibia.
(2014).
Mikrofossiilid maailma vanimates fosforiitides.
Schola Geologica X: Fosfor – aegade algusest tänapäevani, Jäneda, Estonia.
Kontakt
- kaarel.mand@ut.ee
- Tartu Ülikool, Geoloogia Osakond, Ravila 14A, 50411 Tartu, Eesti