Cretaceous and Cenozoic geology east of the Tinui Fault Complex in northeastern Wairarapa, New Zealand

Abstract

The study area, which has Mataikona in the southeast, lies within the east coast ranges, northeast

Neogene development of the onland part of the forearc in northern Wairarapa, North Island, New Zealand: A synthesis

“…The Eketahuna Basin is a successor basin, which originated in earliest Pliocene time when there was uniform downwarping in much of the forearc, and the bathyal Eketahuna Trough formed. The main stratigraphic units of the onland part of the forearc in northern Wairarapa (after Neef 1974Neef , 1992bNeef , 1995Neef , 1997a Inboard of the accretionary prism lie the following extant (or extinct) onland forearc units: (1) Coastal Block (outboard); (2) Tawhero Basin; (3) Forearc Platform; (4) Mt Bowen Basin; (5) Mauriceville Ridge; (6) Eketahuna Basin (with two subunits); and (7) the Axial Ranges (inboard) (Fig. 2,3).…”

“…1). (Moore 1988) BOUNDING FAULTS: The western boundary of the Coastal Block lies along the Tinui Fault Complex, and its eastern margin is bounded by the Whakataki Fault (Neef 1995) and the western margins of the Owahanga and Panui diapirs (Neef 1992b) (Fig. 7).…”

“…7). The Tinui Fault was active in early and mid-Miocene time, whereas faulting along the eastern margin of the unit was in post-early Miocene time (Neef 1995).…”

“…7) (Neef 1992b(Neef , 1995 Locally these strata are overlain by less indurated, but als< steeply northwest-dipping, Late Cretaceous and Eocene bathyal strata. The highly calcareous, bathyal Weber Formation, of Oligocene age and widespread in Nev, Zealand, is virtually absent (Neef 1992b;1995).…”

“…7) (Neef 1992b(Neef , 1995 Locally these strata are overlain by less indurated, but als< steeply northwest-dipping, Late Cretaceous and Eocene bathyal strata. The highly calcareous, bathyal Weber Formation, of Oligocene age and widespread in Nev, Zealand, is virtually absent (Neef 1992b;1995). Miocene Two c. 1-2 m thick debris-flow deposit beds within the Whakataki Formation outboard of the Owahanga Hill diapir in the accretionary prism show that diapir activit was syndepositional (Neef 1992b), whereas exposures at the eastern margin of the Panui diapir (metric grid ref.…”