Palynomorph preservation in volcaniclastic rocks of the Miocene Tepoztlan formation (Central Mexico) and implications for paleoenvironmental reconstruction

dc.contributor.authorLenhardt, Nils
dc.contributor.authorHerrmann, Mark
dc.contributor.authorGoetz, A.E. (Annette)
dc.contributor.emailnils.lenhardt@up.ac.zaen_US
dc.date.accessioned2014-06-04T08:43:43Z
dc.date.available2014-06-04T08:43:43Z
dc.date.issued2013-10
dc.description.abstractPalynomorph preservation in sedimentary rocks is strongly affected by various taphonomic factors related to transport, deposition, diagenesis and preservation potential. The palynological record may contribute to distinguish different taphonomic factors and also displays changes in paleoenvironment, especially in volcanic settings where a very complex interaction of eruptive, gravitational and fluvial processes in time and space can be observed. Herein, we report on new palynological data from the Miocene Tepoztlán Formation. The 800 m thick formation mainly consists of pyroclastic rocks, mass flow units (lahars) and fluvial deposits. It is part of the southern Transmexican Volcanic Belt, cropping out south of the Valley of Mexico and within the two states of Morelos and Mexico State. The volcaniclastic succession records various stages of recovery of vegetation related to a wide variety of disturbance factors and mechanisms. During the entire period of deposition, mixed mesophytic forests appear to have been widespread in the lowlands along streams and midaltitude uplands surrounding the valley. Pollen assemblages were repeatedly reset by volcanic eruptions or their secondary effects (lahars) to more limited assemblages with gradual recoveries to the initial stages before the eruption. A clear distinction can be made between samples taken from different transport regimes (fluvial, lahar and pyroclastic flow transport). The highest percentages of well-preserved, amorphous, and crumpled palynomorphs can be found in fluvial sediments while the highest percentage of fragmented palynomorphs is characteristic of lahar deposits. In contrast, the highest percentage of corroded palynomorphs can be found in deposits originating from pyroclastic flows.en_US
dc.description.librarianhb2014en_US
dc.description.urihttp://palaios.sepmonline.orgen_US
dc.identifier.citationLenhardt, N, Herrmann, M & Gotz, AE 2013, 'Palynomorph preservation in volcaniclastic rocks of the MioceneTepoztlan formation (Central Mexico) and implications for paleoenvironmental reconstruction', Palaios, vol. 28, no. 9, pp. 710-723.en_US
dc.identifier.issn0883-1351 (print)
dc.identifier.issn1938-5323 (online)
dc.identifier.other10.2110/palo.2013.p13-015r
dc.identifier.urihttp://hdl.handle.net/2263/39982
dc.language.isoenen_US
dc.publisherSEPM Society for Sedimentary Geologyen_US
dc.rights© 2014 by the SEPM Society for Sedimentary Geologyen_US
dc.subjectVolcaniclasticsen_US
dc.subjectPalynomorphsen_US
dc.subjectTaphonomyen_US
dc.subjectMioceneen_US
dc.subjectCentral Mexicoen_US
dc.titlePalynomorph preservation in volcaniclastic rocks of the Miocene Tepoztlan formation (Central Mexico) and implications for paleoenvironmental reconstructionen_US
dc.typePostprint Articleen_US

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