Multiphase, decoupled faulting in the southern German Molasse Basin – evidence from 3-D seismic data

dc.bibliographicCitation.firstPage2097eng
dc.bibliographicCitation.issue6eng
dc.bibliographicCitation.lastPage2117eng
dc.bibliographicCitation.volume11eng
dc.contributor.authorShipilin, Vladimir
dc.contributor.authorTanner, David C.
dc.contributor.authorvon Hartmann, Hartwig
dc.contributor.authorMoeck, Inga
dc.date.accessioned2022-08-19T05:32:51Z
dc.date.available2022-08-19T05:32:51Z
dc.date.issued2020
dc.description.abstractWe use three-dimensional seismic reflection data from the southern German Molasse Basin to investigate the structural style and evolution of a geometrically decoupled fault network in close proximity to the Alpine deformation front. We recognise two fault arrays that are vertically separated by a clay-rich layer – lower normal faults and upper normal and reverse faults. A frontal thrust fault partially overprints the upper fault array. Analysis of seismic stratigraphy, syn-kinematic strata, throw distribution, and spatial relationships between faults suggest a multiphase fault evolution: (1) initiation of the lower normal faults in the Upper Jurassic carbonate platform during the early Oligocene, (2) development of the upper normal faults in the Cenozoic sediments during the late Oligocene, and (3) reverse reactivation of the upper normal faults and thrusting during the mid-Miocene. These distinct phases document the evolution of the stress field as the Alpine orogen propagated across the foreland. We postulate that interplay between the horizontal compression and vertical stresses due to the syn-sedimentary loading resulted in the intermittent normal faulting. The vertical stress gradients within the flexed foredeep defined the independent development of the upper faults above the lower faults, whereas mechanical behaviour of the clay-rich layer precluded the subsequent linkage of the fault arrays. The thrust fault must have been facilitated by the reverse reactivation of the upper normal faults, as its maximum displacement and extent correlate with the occurrence of these faults. We conclude that the evolving tectonic stresses were the primary mechanism of fault activation, whereas the mechanical stratigraphy and pre-existing structures locally governed the structural style.eng
dc.description.versionpublishedVersioneng
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/10084
dc.identifier.urihttp://dx.doi.org/10.34657/9122
dc.language.isoengeng
dc.publisherGöttingen : Copernicus Publ.eng
dc.relation.doihttps://doi.org/10.5194/se-11-2097-2020
dc.relation.essn1869-9529
dc.relation.ispartofseriesSolid earth : SE 11 (2020), Nr. 6eng
dc.rights.licenseCC BY 4.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/eng
dc.subjectClay mineralseng
dc.subjectSeismic waveseng
dc.subjectSeismologyeng
dc.subjectStratigraphyeng
dc.subjectCarbonate platformseng
dc.subject.ddc550eng
dc.titleMultiphase, decoupled faulting in the southern German Molasse Basin – evidence from 3-D seismic dataeng
dc.typearticleeng
dc.typeTexteng
dcterms.bibliographicCitation.journalTitleSolid earth : SEeng
tib.accessRightsopenAccesseng
wgl.contributorLIAGeng
wgl.subjectGeowissenschafteneng
wgl.typeZeitschriftenartikeleng
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