Gutenberg Open


Personen: Salomon, Eric (Autor) 
Koehn, Daniel (Autor) 
Passchier, Cornelis Willem (Autor) 
Chung, Peter (Autor) 
Häger, Tobias (Autor) 
Salvona, Aron (Autor) 
Davis, Jennifer (Autor) 
Titel: Deformation and fluid flow in the Huab Basin and Etendeka Plateau, NW Namibia
Quelle: Journal of structural geology. Bd. 88. Amsterdam u.a. : Elsevier Science. S. 46 - 62
Erscheinungsjahr:    2016
ISBN / ISSN: 0191-8141
URL der Originalveröffentlichung doi:10.1016/j.jsg.2016.05.001
Zeitschriftenaufsatz Zeitschriftenaufsatz
Sprache: Englisch
Open Access:
Personen der Universität:    Salomon, Eric  In UnivIS suchen  ; Passchier, Cornelis Willem  In UnivIS suchen ; Häger, Tobias  In UnivIS suchen 
Einrichtung: Institut für Geowissenschaften
DDC-Sachgruppe:    Geowissenschaften
DFG-Fachgebiet: Geologie und Paläontologie
ID: 53913  Universitätsbibliothek Mainz
Informationen zu den Nutzungsrechten unserer Inhalte Informationen zu den Nutzungsrechten unserer Inhalte
Abstract: The Lower Cretaceous Twyfelfontein sandstone formation in the Huab Basin in NW Namibia shows the effects of volcanic activity on a potential reservoir rock. The formation was covered by the Paraná-Etendeka Large Igneous Province shortly before or during the onset of South-Atlantic rifting. Deformation bands found in the sandstone trend mostly parallel to the continental passive margin and must have formed during the extrusion of the overlying volcanic rocks, indicating that their formation is related to South-Atlantic rifting. 2D-image porosity analysis of deformation bands reveals significant porosity reduction from host rock to band of up to 70%. Cementation of the sandstone, linked to advective hydrothermal flow during volcanic activity, contributes an equal amount to porosity reduction from host rock to band when compared to initial grain crushing. Veins within the basaltic cover provide evidence for hot fluid percolation, indicated by spallation of wall rock and colloform quartz growth, and for a later low-temperature fluid circulation at low pressures indicated by stilbite growth sealing cavities. Sandstone samples and veins in the overlying volcanic rocks show that diagenesis of the Twyfelfontein sandstone is linked to Atlantic rifting and was affected by both hydrothermal and low-thermal fluid circulation.
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