Controls of pre‐existing structures on clinoform architecture and the associated progradational system elements

Abstract

There remains a limited understanding of the controls of pre-existing structures on the architecture of deep-water progradational sequences. In the Northern Taranaki Basin (NTB), New Zealand, Pliocene post-extensional sedimentary sequences overlie Miocene back-arc volcaniclastic units. We utilize seismic reflection datasets to investigate the relationships between the buried back-arc mound-shaped structures, 876 | EAGE CLAIRMONT eT AL. Highlights • Buried syn-extension volcanoes occur only in the north area. • Differential compaction of post-extension sequences are influenced by the paleovolcanoes. • Steep clinoform foreset slopes and wide incising channels in the north, but are absent in the south. • The later differential compaction influenced the basinward migration and geometry of continental slope. • Buried volcanoes in the north modulated the postextension sedimentation patterns. 878 | EAGE CLAIRMONT eT AL. F I G U R E 1 Location and the geologic setting of the study area. (a) Topographic map of northern New Zealand showing the Taranaki and Northland Basins, large faults and the Miocene volcanic fields of the Mohakatino Volcanic Belt (modified after Stagpoole & Funnell, 2001 and Johnston et al., 2010). The location of the primary study area (Nimitz 3D Seismic Survey) is shown in the white rectangle, together with a 2D transect line used to show the extent of interpreted geologic features, discussed throughout this expert. (b) Map of the Nimitz 3D seismic survey and location of the Korimako-1 well. (c) Generalized stratigraphic column of the upper fill of the Taranaki Basin (after Unkaracalar, 2018 and King & Thrasher, 1996), and generated wireline logs and synthetic model of the Korimako-1 well. The following stage abbreviations reflect the local geology of the

Impact of igneous intrusion and associated ground deformation on the stratigraphic record

“…7). Considering how differential compaction may affect subsurface structures in volcanic areas, where incompressible intrusive or extrusive igneous rocks occur, is critical to properly assessing palaeosurface geomorphology (Clairmont et al 2021).…”