Geohistory plots for seismic shot points and a composite well/outcrop section in the Northland Basin, New Zealand

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Herzer, R.H. 1993 Geohistory plots for seismic shot points and a composite well/outcrop section in the Northland Basin, New Zealand. Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 93/11 62 p.

Abstract: Seismic facies and sequence stratigraphy, regional paleogeography and (in one case) biostratigraphy have been combined to compute geohistory and sedimentation rate plots for seven offshore shot point locations and one onshore composite (well+outcrop) section in the Northland Basin. The geohistory plots present paleobathymetric, compaction and sea-level corrected unit subsidence, tectonic and total subsidence curves for each location. Collectively, the curves record the following sequence of events in the Northland Basin: (i) rapid subsidence and high rates of sedimentation in the Late Cretaceous, (ii) gradual subsidence and low sedimentation rates through the Paleogene, (iii) increased subsidence in the Oligocene, culminating in (iv) rapid subsidence with high sedimentation rates in the Early Miocene, and finally (v) basin infilling by progradation throughout the late Neogene. (auth)