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Late Lutetian Thermal Maximum

The Late Lutetian Thermal Maximum (LLTM), also known as the C19r Event,[1] was a hyperthermal event that occurred during the Lutetian epoch.[2]

Timing

The LLTM occurred about 41.52 Ma,[1] amidst a broader cooling trend known as the Middle-Late Eocene Cooling (MLEC),[2] and lasted for about 30 kyr.[1] It is believed to have been a globally synchronous event.[3]

Causes

The LLTM coincided with exceptionally high insolation of the Northern Hemisphere caused by the coincidence of a precession minimum modulated by high eccentricity and an obliquity maximum, which also cooccurred with maxima in the 2.4 Myr eccentricity cycle and the 1.2 Myr obliquity cycle.[1]

Effects

The high solar irradiance experienced by the Earth during the LLTM caused an acceleration of the water cycle, increasing the rate of runoff and input of terrestrial sediment into the ocean. This resulted in the freshening and eutrophication of seawater. Amidst these conditions occurred peaks in the abundance of opportunistic Reticulofenestra that were less than 5 μm in size and of an assortment of opportunistic benthic foraminifera, while the oligotrophic calcareous nannofossil Zygrhablithus bijugatus was significantly reduced in abundance.[4]

References

  1. ^ a b c d Westerhold, T.; Röhl, Ursula; Donner, B.; Frederichs, T.; Kordesch, W. E. C.; Bohaty, Steven M.; Hodell, D. A.; Laskar, J.; Zeebe, R. E. (27 December 2017). "Late Lutetian Thermal Maximum—Crossing a Thermal Threshold in Earth's Climate System?". Geochemistry, Geophysics, Geosystems. 19 (1): 73–82. doi:10.1002/2017GC007240. ISSN 1525-2027. Retrieved 3 February 2025 – via Wiley Online Library.
  2. ^ a b Scotese, Christopher Robert; Song, Haijun; Mills, Benjamin J.W.; van der Meer, Douwe G. (April 2021). "Phanerozoic paleotemperatures: The earth's changing climate during the last 540 million years". Earth-Science Reviews. 215: 103503. Bibcode:2021ESRv..21503503S. doi:10.1016/j.earscirev.2021.103503. Retrieved 3 February 2025 – via Elsevier Science Direct.
  3. ^ Edgar, Kirsty M.; Bohaty, Steven M.; Coxall, Helen K.; Bown, Paul R.; Batenburg, Sietske J.; Lear, Caroline H.; Pearson, Paul N. (27 July 2020). "New composite bio- and isotope stratigraphies spanning the Middle Eocene Climatic Optimum at tropical ODP Site 865 in the Pacific Ocean". Journal of Micropalaeontology. 39 (2): 117–138. Bibcode:2020JMicP..39..117E. doi:10.5194/jm-39-117-2020. ISSN 2041-4978. Retrieved 3 February 2025 – via Copernicus Publishing.
  4. ^ Intxauspe-Zubiaurre, Beñat; Martínez-Braceras, Naroa; Payros, Aitor; Ortiz, Silvia; Dinarès-Turell, Jaume; Flores, José-Abel (15 September 2018). "The last Eocene hyperthermal (Chron C19r event, ~41.5 Ma): Chronological and paleoenvironmental insights from a continental margin (Cape Oyambre, N Spain)". Palaeogeography, Palaeoclimatology, Palaeoecology. 505: 198–216. Bibcode:2018PPP...505..198I. doi:10.1016/j.palaeo.2018.05.044. Retrieved 3 February 2025 – via Elsevier Science Direct.

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Index: pl ar de en es fr it arz nl ja pt ceb sv uk vi war zh ru af ast az bg zh-min-nan bn be ca cs cy da et el eo eu fa gl ko hi hr id he ka la lv lt hu mk ms min no nn ce uz kk ro simple sk sl sr sh fi ta tt th tg azb tr ur zh-yue hy my ace als am an hyw ban bjn map-bms ba be-tarask bcl bpy bar bs br cv nv eml hif fo fy ga gd gu hak ha hsb io ig ilo ia ie os is jv kn ht ku ckb ky mrj lb lij li lmo mai mg ml zh-classical mr xmf mzn cdo mn nap new ne frr oc mhr or as pa pnb ps pms nds crh qu sa sah sco sq scn si sd szl su sw tl shn te bug vec vo wa wuu yi yo diq bat-smg zu lad kbd ang smn ab roa-rup frp arc gn av ay bh bi bo bxr cbk-zam co za dag ary se pdc dv dsb myv ext fur gv gag inh ki glk gan guw xal haw rw kbp pam csb kw km kv koi kg gom ks gcr lo lbe ltg lez nia ln jbo lg mt mi tw mwl mdf mnw nqo fj nah na nds-nl nrm nov om pi pag pap pfl pcd krc kaa ksh rm rue sm sat sc trv stq nso sn cu so srn kab roa-tara tet tpi to chr tum tk tyv udm ug vep fiu-vro vls wo xh zea ty ak bm ch ny ee ff got iu ik kl mad cr pih ami pwn pnt dz rmy rn sg st tn ss ti din chy ts kcg ve
Prefix: a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9

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