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Thermo-mechanical modelling of progressive deformation at the lithosphere-asthenosphere boundary: The effect of a horizontal pressure gradient
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik.ORCID-id: 0000-0002-9165-6384
Goethe-University, Institute of Geoscience, Frankfurt am Main, Germany.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik.
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nationell ämneskategori
Geologi Multidisciplinär geovetenskap
Forskningsämne
Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
Identifikatorer
URN: urn:nbn:se:uu:diva-280695OAI: oai:DiVA.org:uu-280695DiVA, id: diva2:911788
Tillgänglig från: 2016-03-14 Skapad: 2016-03-14 Senast uppdaterad: 2024-04-18
Ingår i avhandling
1. Strain quantifications in different tectonic scales using numerical modelling
Öppna denna publikation i ny flik eller fönster >>Strain quantifications in different tectonic scales using numerical modelling
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis focuses on calculation of finite and progressive deformation in different tectonic scales using 2D numerical models with application to natural cases. Essentially, two major tectonic areas have been covered: a) salt tectonics and b) upper mantle deformation due to interaction between the lithosphere and asthenosphere.

The focus in salt tectonics lies on deformation within down-built diapirs consisting of a source layer feeding a vertical stem. Three deformation regimes have been identified within the salt: (I) a squeezing channel flow underneath the overburden, (II) a corner flow underneath the stem, and (III) a pure channel flow within the stem. The results of the model show that the deformation pattern within the stem of a diapir (e.g. symmetric or asymmetric) can reveal information on different rates of salt supplies from the source layer (e.g. observed in Klodowa-diapir, Poland). Composite rock salt rheology results in strong localization and amplification of the strain along the salt layer boundaries in comparison to Newtonian rock salt. Flow and fold structures of passive marker lines are directly correlated to natural folds within a salt diapir.

In case of the upper mantle, focus lies on deformation and resulting lattice preferred orientation (LPO) underneath an oceanic plate. Sensitivity of deformation and seismic anisotropy on rheology, grain size (d), temperature (T), and kinematics (v) has been investigated. The results of the model show that the mechanical lithosphere-asthenosphere boundary is strongly controlled by T and less so by v or d. A higher strain concentration within the asthenosphere (e.g. for smaller potential mantle temperatures, higher plate velocities, or smaller d) indicates a weaker coupling between the plate and the underlying mantle, which becomes stronger with the age of the plate. A Poiseuille flow within the asthenosphere, significantly affects the deformation and LPO in the upper mantle. The results of the model show, that deformation in the upper mantle at a certain distance away from the ridge depends on the absolute velocity in the asthenosphere. However, only in cases of a driving upper mantle base does the seismic anisotropy and delay times reach values within the range of natural data.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2016. s. 58
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1354
Nyckelord
Deformation modelling, progressive and finite deformation, salt tectonics, down-built diapir, upper mantle, lithosphere-asthenosphere boundary, seismic anisotropy, plate-mantle (de)coupling
Nationell ämneskategori
Geologi Multidisciplinär geovetenskap
Forskningsämne
Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
Identifikatorer
urn:nbn:se:uu:diva-280759 (URN)978-91-554-9513-8 (ISBN)
Disputation
2016-05-04, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2016-04-11 Skapad: 2016-03-15 Senast uppdaterad: 2024-04-18

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Fuchs, LukasKoyi, Hemin

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