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Thermal history and basin evolution of the Moatize - Minjova Coal Basin (N'Condédzi sub-basin, Mozambique) constrained by organic maturation levels

2019Journal article Open access
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dc.contributor.authorGalasso, Francesca
dc.contributor.authorFernandes, Paulo
dc.contributor.authorMontesi, Giovanni
dc.contributor.authorMarques, João
dc.contributor.authorSpina, Amália
dc.contributor.authorPereira, Zélia
dc.date.accessioned2020-12-15T17:13:20Z
dc.date.available2024-12-01T01:30:44Z
dc.date.issued2019
dc.date.updated2020-12-07T10:31:55Z
dc.description.abstractABSTRACT: Kerogen concentrates obtained from Lopingian (Late Permian) to Upper Triassic mudrock lithologies of seven coal exploration boreholes, drilled in the Moatize – Minjova Coal Basin (N'Condédzi sub-basin, Mozambique), were studied by means of vitrinite reflectance (VR), spore fluorescence and spore colour, in order to constrain the thermal history and basin evolution by organic maturation levels. VR increases with depth, indicating organic maturation related to sediment burial for most of the boreholes. Modelled VR data indicate a regional palaeogeothermal gradient between 35 and 40 °C/km. Lower Jurassic doleritic intrusions observed in three boreholes had only local thermal effects without affecting the regional palaeogeothermal gradient. Two boreholes located near the basin margin show high palaeogeothermal gradients suggesting thermal processes other than heating due to burial were involved. These processes may have involved hot diagenetic fluids circulating through fault zones and/or permeable lithologies, locally elevating geothermal gradients. Circulation of these fluids was induced by lithostatic pressure due to rapid rates of sedimentation. These high sedimentation rates lead to the accumulation of a thick succession (over 2000 m) of Lopingian (Late Permian) to Upper Triassic siliciclastic sediments. All the organic maturation indices measured and the age of the successions indicate that organic maturation occurred during or after Late Triassic times. However, the presence of reworked Permian palynomorphs into Upper Triassic sediments and the absence of Middle Triassic sediments indicate an exhumation and erosion of Permian strata in Middle Triassic times. The organic maturation levels of the reworked palynomorph population are considerably higher than the indigenous Upper Triassic population, indicating that they attained higher burial temperatures prior to being reworked.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationGalasso, F... [et.al.] - Thermal history and basin evolution of the Moatize - Minjova Coal Basin (N'Condédzi sub-basin, Mozambique) constrained by organic maturation levels. In: Journal of African Earth Sciences, 2019, Vol. 153, p. 219-238pt_PT
dc.identifier.doi10.1016/j.jafrearsci.2019.02.020pt_PT
dc.identifier.eid2-s2.0-85062984270
dc.identifier.issn1464-343X
dc.identifier.slugcv-prod-2107222
dc.identifier.urihttp://hdl.handle.net/10400.9/3517
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationPermian-Triassic palaeoclimatic cycles of the Karoo Supergroup in Mozambique, and its implications on a changing world
dc.relation.publisherversionhttps://doi.org/10.1016/j.jafrearsci.2019.02.020pt_PT
dc.subjectPaleogeografiapt_PT
dc.subjectPalinostratigrafiapt_PT
dc.subjectPalinomorfospt_PT
dc.subjectMaturação orgânicapt_PT
dc.subjectVitrinitept_PT
dc.subjectKaroopt_PT
dc.subjectMoçambiquept_PT
dc.titleThermal history and basin evolution of the Moatize - Minjova Coal Basin (N'Condédzi sub-basin, Mozambique) constrained by organic maturation levelspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitlePermian-Triassic palaeoclimatic cycles of the Karoo Supergroup in Mozambique, and its implications on a changing world
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTA-GEO%2F30082%2F2017/PT
oaire.citation.endPage238pt_PT
oaire.citation.startPage219pt_PT
oaire.citation.titleJournal of African Earth Sciencespt_PT
oaire.citation.volume153pt_PT
oaire.fundingStream3599-PPCDT
person.familyNameFernandes
person.familyNamePereira
person.givenNamePaulo
person.givenNameZélia
person.identifier422469
person.identifier.ciencia-id051D-A133-65D9
person.identifier.ciencia-id6C1B-ED1C-8F5D
person.identifier.orcid0000-0003-4888-0230
person.identifier.orcid0000-0003-3056-6219
person.identifier.ridJ-6577-2014
person.identifier.scopus-author-id57197129025
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.cv.cienciaid6C1B-ED1C-8F5D | Zélia Pereira
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationb42caa3f-b216-443e-921f-a05b10543663
relation.isAuthorOfPublication5d2bf797-f915-4f53-ae53-166dedd0845a
relation.isAuthorOfPublication.latestForDiscovery5d2bf797-f915-4f53-ae53-166dedd0845a
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