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Terrestrial environmental change across the Permian-Triassic boundary in the Karoo Zambezi Basin, Mozambique: Integrating palynological, sedimentological and carbon isotope evidence

2026-07Artigo científico Acesso aberto
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datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
datacite.subject.fosCiências Naturais::Outras Ciências Naturais
dc.contributor.authorFernandes, Paulo
dc.contributor.authorPereira, Zélia
dc.contributor.authorSpangenberg, J. E.
dc.contributor.authorSilva Mendes, Márcia Cristina
dc.contributor.authorLopes, Gilda
dc.contributor.authorJorge, Raul C. G. Santos
dc.contributor.authorAlbardeiro, Luís
dc.contributor.authorFont, Eric
dc.contributor.authorAdatte, T.
dc.contributor.authorVennemann, T.
dc.contributor.authorMarques, J.
dc.date.accessioned2026-09-09T14:38:06Z
dc.date.available2026-09-09T14:38:06Z
dc.date.issued2026-07
dc.description.abstractABSTRACT: The Permian-Triassic boundary (PTB; ca. 252 Ma) marks the most severe biotic crisis in Earth history, yet high-resolution terrestrial records from southeastern Gondwana, outside the Main Karoo Basin of South Africa, remain scarce. We present a multidisciplinary investigation of borehole CIMT-014 from the N'Cond & eacute;dzi Coalfield, Mozambique, which preserves a near-continuous continental succession spanning the PTB within the Karoo Zambezi Basin. Sedimentological, palynological, palynofacies, total organic carbon (TOC), and organic carbon isotope (delta(13)Corg) analyses were integrated to reconstruct environmental, ecological, and carbon-cycle changes across the transition. The uppermost Permian Matinde Formation comprises organic-rich floodplain mudstones, siltstones, and thin coal seams deposited under warm, humid conditions and dominated by Glossopteris-associated gymnosperm floras. Crossing the PTB, these deposits are abruptly replaced by conglomeratic, lacustrine, and fluvial sediments of the C & aacute;dzi Formation. Palynological data document a marked decline of glossopterid and other gymnosperm pollen, followed by a short-lived increase in opportunistic lycophyte and fern spores. Concurrently, palynofacies shift from assemblages rich in non-opaque phytoclasts to assemblages dominated by opaque phytoclasts, while TOC values decline from >40 wt% in coal-bearing intervals to <0.2 wt% in the earliest Triassic succession. A pronounced negative delta(13)Corg excursion of approximately 5.4 parts per thousand occurs across the boundary interval, with values decreasing from -25.0 parts per thousand to a minimum of -30.4 parts per thousand. The magnitude, stratigraphic coherence, and association with floral turnover, cessation of peat formation, and fluvial reorganisation indicate that the isotopic carbon excursion records a major perturbation of the global carbon cycle rather than local diagenetic effects. The isotopic signal is consistent with widespread carbon-cycle disruption linked to Siberian Traps magmatism and associated greenhouse-gas emissions. Our results demonstrate that terrestrial ecosystems in southeastern Gondwana experienced profound ecological and environmental disruption during the end-Permian crisis and establish the Karoo Zambezi Basin of Mozambique as a key archive for correlating continental records of the PTB in Gondwana.eng
dc.identifier.citationFernandes, P., Pereira, Z., Spangenberg, J.E., Mendes, M., Lopes, G., Jorge, R.C.G.S., Albardeiro, L., Font, E., Adatte, T., Vennemann, T., & Marques, J. (2026). Terrestrial environmental change across the Permian-Triassic boundary in the Karoo Zambezi Basin, Mozambique: Integrating palynological, sedimentological and carbon isotope evidence. In: Palaeogeography, Palaeoclimatology, Palaeoecology, 2026, vol. 699, article 114049. https://doi.org/10.1016/j.palaeo.2026.114049
dc.identifier.doi10.1016/j.palaeo.2026.114049
dc.identifier.eissn1872-616X
dc.identifier.issn0031-0182
dc.identifier.urihttp://hdl.handle.net/10400.9/6437
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationAquatic Research Infrastructure Network
dc.relationCentre for Marine and Environmental Research (CIMA)
dc.relationInstitute Dom Luiz
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0031018226005122?pes=vor&utm_source=clarivate&getft_integrator=clarivate&__cf_chl_tk=MRx_pTAg1QB3XWcjmm2.enwxCzQ8zxoyzZc0xs81Sfo-1788961492-1.0.1.1-1OFqysNCp7RWH56uATMkSc7dcgkYzaCDXf_GvLxc6wE
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectPalynology
dc.subjectCarbon isotopes
dc.subjectGondwana
dc.subjectPermian-Triassic boundary
dc.subjectMozambique
dc.titleTerrestrial environmental change across the Permian-Triassic boundary in the Karoo Zambezi Basin, Mozambique: Integrating palynological, sedimentological and carbon isotope evidenceeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberLA/P/0069/2020
oaire.awardNumberUIDP/00350/2020
oaire.awardNumberUID/GEO/50019/2019
oaire.awardTitleAquatic Research Infrastructure Network
oaire.awardTitleCentre for Marine and Environmental Research (CIMA)
oaire.awardTitleInstitute Dom Luiz
oaire.awardURIhttp://hdl.handle.net/10400.9/5686
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00350%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FGEO%2F50019%2F2019/PT
oaire.citation.titlePalaeogeography, Palaeoclimatology, Palaeoecology
oaire.citation.volume699
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameFernandes
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person.familyNameSilva Mendes
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project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
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