A multifaceted study of the offshore Titihaoa-1 drillhole and a Neogene accretionary slope basin, Hikurangi subduction margin

This paper presents a reappraisal of datasets from Titihaoa-1, an offshore petroleum exploration drillhole that intersects a ∼2740 m-thick Holocene to early-middle Miocene sedimentary succession in the Titihaoa Sub-basin, part of the Hikurangi accretionary wedge. The well provides an important datap...

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Bibliographic Details
Published in:New Zealand journal of geology and geophysics 2022-01, Vol.65 (1), p.79-104
Main Authors: Griffin, Angela G., Bland, Kyle J., Morgans, Hugh E. G., Strogen, Dominic P.
Format: Article
Language:English
Subjects:
Accretion
biostratigraphy
Datasets
East Coast Basin
Ecological succession
flysch
FMI™ image log
Foraminifera
Geological history
Holocene
in-situ stress
Lithofacies
Miocene
Mudstone
Neogene
Offshore
Oil and gas exploration
Oil exploration
Outcrops
paleoenvironments
Palliser group
Petroleum
Sedimentation rates
Stratigraphy
Subduction
Subduction (geology)
Titihaoa sub-basin
Turbidites
Water depth
Whakataki Formation
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Summary:This paper presents a reappraisal of datasets from Titihaoa-1, an offshore petroleum exploration drillhole that intersects a ∼2740 m-thick Holocene to early-middle Miocene sedimentary succession in the Titihaoa Sub-basin, part of the Hikurangi accretionary wedge. The well provides an important datapoint in the offshore southern Hikurangi subduction margin. We present new and revised foraminiferal biostratigraphic and paleoenvironmental interpretations that help to constrain age, depositional paleo-water depths, sedimentation rates, and oceanicity. Analysis of open-hole wireline and image-log datasets, combined with analogues from nearby outcrops, provide an improved understanding of the sedimentary architecture, depositional systems, and present-day in-situ stress at the drillhole site. The succession within Titihaoa-1 comprises a shallowing-upward succession of thin-bedded lower- to middle-bathyal turbidites, overlain by mudstone-dominated lithofacies deposited in the middle- to upper-bathyal and mid-shelf environments. The geological history and stratigraphic trends within the Titihaoa Sub-basin are analogous to other Neogene accretionary wedge basins within the Hikurangi Margin.
ISSN:0028-8306
1175-8791
DOI:10.1080/00288306.2021.1932527