Frontispiece.

A. Coastal infrared satellite image of eastern New Zealand. Site 1119 is located near the junction between warmer subtropical water (blue) and colder subantarctic (magenta) water masses, which are separated across the Southland Front and are both northward traveling. Also marked are (A) the passage of both water bodies through the Mernoo Gap, east of Banks Peninsula, and (B) a small eddy spawned from the Wairarapa Eddy at the southern end of the south-traveling East Coast Current.1 Inset: satellite view from 650 km of the eruption of 17 June 1996 from Mt. Ruapehu, central North Island. Note the characteristic east-turning dispersion of the ash plume.2  

B. Eastern New Zealand Sedimentary System (ENZOSS), the source. View northwest up the braided Tasman River, outwash train from the Tasman Glacier, located east of the high peak of Mt. Cook (3754 m), the highest peak of the Southern Alps mountain range, the western side of which coincides with the Alpine Fault and the boundary between the Pacific and the Australian plates. Click on images for individual enlargements.

THE SCIENCE SETTING: THREE RECONCILABLE VIEWS?

Plate Boundary
"The narrow-gutted but lofty archipelago of New Zealand, consisting of two large and many smaller islands, rises from a system of relatively shallow submarine rises and plateaux between the South West Pacific Ocean and the Tasman Sea. (This mountainous region is).... part of a complex system that extends north to Melanesia, then westward to the Indonesian archipelago and northward to Japan and beyond as the geographic manifestation of the Circum-Pacific Mobile Belt."
Charles A. Fleming (1975)

C. February 1770 pen sketch of "a mountain of stupendous height, which was covered with snow," when Resolution was 6 leagues offshore from the mouth of the Clarence River.3 Mt. Tapuae-o-Uenuku (2885 m), the highest peak of the Inland Kaikoura Range, is viewed across the northward-declining heights of the coastal Seaward Kaikoura Range. These ranges are bounded by the major transcurrent Wairau, Awatare, and Clarence Faults, which splay northeastward from the Alpine Fault to link to the Hikurangi subduction margin.4

Passive Margin
"A transgression, which began in the early Upper Cretaceous, extended more and more widely from time to time; and in many districts marine deposition went on continuously or almost continuously (with local breaks only) throughout the Tertiary era. Unconformities, some of them strongly angular, and also such disconformities as have been discovered, are for the most part of limited lateral extent, indicating only local emergence and erosion.... Though it is unlikely that a complete section exists at any one place (in the area that is now above the sea), it was long ago suspected that when evidence from many scattered localities was pieced together a record would be available of beds of every age from early Upper Cretaceous to Pliocene. With the help of micro-palaeontology this goal is in sight; and it now seems even that the record continues through Pleistocene into Recent time."
Charles A. Cotton (1955)

D. Pen sketch by Sir Charles Cotton (1954), which summarizes the Cretaceo-Cenozoic (Notocene; Kaikoura Synthem) stratigraphy of the New Zealand microcontinent. The postrift sediment apron, shown here in a faulted inlier, comprises a Late Cretaceous–late Eocene marine transgressive sequence that passes from terrigenous inshore facies to offshore biopelagic radiolarian and nannoplankton oozes. By the early Oligocene, the New Zealand landmass was almost entirely submerged. Above the Amuri limestone, a thin succession of regressive terrigenous sediment dips into and is truncated against the Clarence Fault, the master structure along which the Inland Kaikoura Range was uplifted from the Early Miocene onward. 

Global Ocean Circulations
"Two prominent global-scale ocean circulations, namely the thermohaline ‘conveyor belt’ and the Antarctic Circumpolar Current, are difficult to treat on an individual or partial basis.... These two circulations interact extensively with each other, via both mean and eddy flows; and the two are jointly affected by thermohaline and wind forcing. Thus many ocean regions and processes are significantly interdependent, and use of a global model is advisable."
A.J. Semtner and R.M. Chervin (1992)

E. Modeled flow field of the Australasian Southern Ocean part of the global ocean,5 depicted as a time-averaged vector plot over 5 yr for a water depth range of 3300–5000 m and using a seasonal forcing simulation at 0.5° resolution. An arrow of length 2° in latitude or longitude represents a transport of 5000 m cm/s. Black = Australian, New Zealand, and Antarctic continents, white = seafloor shallower than 3300 m. The model resolves well the strong flows of the Antarctic Circumpolar and Deep Western Boundary currents, apart from an underestimate of the amount of westward flow which occurs adjacent to the Hikurangi Plateau, northen edge of the New Zealand microcontinent.

1Image PEL 701, Coastal Zone Color Scanner, Nimbus 7, Bands 1, 3, 6, taken 20 July 1979. Reproduced courtesy of the National Aeronautical and Space Agency [NASA].
2National Oceanic and Atmospheric Administration [NOAA] Advanced Very High Resolution Radiomenter [AVHRR] Image 14, received and processed by Landcare Research, New Zealand.
3Attributed by Begg and Begg [1969] to Captain James Cook.
4Add 7085, Folio 31, Drawing 2. Digital image provided courtesy of the British Library.
5After Semtner and Chervin, 1992, plate 9.