Lacustrine microbialite pinnacles in the Palaeogene of Patagonia, Argentina: Facies and controls

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dc.contributor.authorAlonso Zarza, Ana María
dc.contributor.authorCabaleri, Nora G.
dc.contributor.authorHuerta, Pedro
dc.contributor.authorArmella, Claudia
dc.contributor.authorRodríguez Berriguete, Álvaro
dc.contributor.authorMonferran, Mateo D.
dc.contributor.authorGallego, Oscar F.
dc.contributor.authorUbaldon, María Cecilia
dc.contributor.authorSilva Nieto, Diego
dc.date.accessioned2023-06-16T15:24:47Z
dc.date.available2023-06-16T15:24:47Z
dc.date.issued2020-10
dc.description.abstractLarge carbonate microbialite build-ups are relatively uncommon in ancient fresh-water lacustrine basins as compared with those marine and saline environments. This paper discusses the formation of a large continental lacustrine deposit, the Oligocene-Miocene Carinao Formation in Argentina, which contains large bioherms. The lacustrine formation occurs in N-S corridor and is mostly composed by meter scale pinnacles and sheet-like carbonate beds that grade to detrital deposits towards the more subsident southern areas. The main facies are autochthonous and allochthonous limestones and detrital deposits. The autochthonous limestones include the carbonate pinnacles, which are about 4 m high and 0.5 m in diameter and coalesce laterally to form very continuous beds (several kms). The pinnacles are formed by plate-like, dome, vertically elongated and irregular horizontal bioherms, most of them with radial structure. The bioherms are boundstones of fibrous (fans and spherulites) and feather calcite crystals, micrite and inequigranular calcite mosaics. Both biogenic and abiogenic processes interfered in carbonate precipitation. Allochthonous limestones include peloidal, ostracod and intraclastic limestones, some containing coated grains. Polymictic conglomerates and cross-bedded hybrid arenites deposited in a fluvial-deltaic system located at the southwest of the basin. δ13C values vary between −0.4 and −3.2‰ VPDB and δ18O are comprised between −5.7 and −8.6‰ VPDB. The 87Sr/86Sr ratios range between 0.7061 and 0.7056. The Carinao Formation deposited in a fresh-water lake, sourced by meteoric and deep-groundwater. Tectonics was a main control determining the configuration of the lake system, the water supply and the alignment of some bioherms. The vertical succession or the different bioherms morphologies reflects well the lake level changes controlled by both tectonic and climate.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Ciencia e Innovación (MICINN)
dc.description.sponsorshipConsejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/62412
dc.identifier.doi10.1016/j.sedgeo.2020.105742
dc.identifier.issn0037-0738
dc.identifier.officialurlhttps://www.sciencedirect.com/science/article/pii/S0037073820301573?via%3Dihub#!
dc.identifier.urihttps://hdl.handle.net/20.500.14352/6612
dc.issue.number105742
dc.journal.titleSedimentary Geology
dc.language.isoeng
dc.publisherElsevier
dc.relation.projectIDCGL2014-54818-P
dc.relation.projectIDPIP-11220150100117CO
dc.rights.accessRightsrestricted access
dc.subject.cdu552.54(828)
dc.subject.keywordLacustrine
dc.subject.keywordPinnacles
dc.subject.keywordBioherms
dc.subject.keywordCarbonate
dc.subject.keywordGeochemistry
dc.subject.keywordArgentina
dc.subject.ucmPetrología
dc.titleLacustrine microbialite pinnacles in the Palaeogene of Patagonia, Argentina: Facies and controls
dc.typejournal article
dc.volume.number408
dspace.entity.typePublication
relation.isAuthorOfPublicationf29ff48e-a667-4a09-89eb-a8c1b3d55083
relation.isAuthorOfPublicationaedd54b2-0df6-4bb6-9401-72410a98f353
relation.isAuthorOfPublication.latestForDiscoveryaedd54b2-0df6-4bb6-9401-72410a98f353
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