Possible Jurassic age for part of Rakaia Terrane: Implications for tectonic development of the Torlesse accretionary prism

Vegetation and climate of the New Zealand Jurassic

“…Or more specifically, where were the components of New Zealand? New Zealand is known to be a collage of tectonic terranes of diverse origins (Bishop et al 1985;Mortimer & Campbell 1996), although Kamp (2001) cautioned that the time has come to consider their potential inter-relationships more than their differences. By the mid-Cretaceous, the components had essentially amalgamated and New Zealand lay in high, polar latitudes, but in the Jurassic at least three units have been identified and their relative positions at that time are still not clear.…”

Integration of zircon color and zircon fission-track zonation patterns in orogenic belts: application to the Southern Alps, New Zealand

“…Torlesse provenance ages (230 Ma) eroded from the highest level crust are represented by component P3 in the Rangitata River sample. Component P1 at 100 Ma in the same sample represents the timing of a major Late Cretaceous cooling event widely recognised in the Torlesse basement (Kamp, 2001) and attributed to exhumation in the inboard parts of the contemporary accretionary prism. Component P2 in the Rangitata River sample having intermediate ages represents grains eroded from the ZPAZ fossilized by the 100 Ma cooling event and exhumed to the surface during the Late Cenozoic.…”

“…Zircon FT ages decrease across the Southern Alps towards the Alpine Fault, and these data define two sets of zircon reset and partial annealing zones (Kamp et al, 1989;Tippett and Kamp, 1993). The older zircon ages are located within the greywacke succession mainly east of the current drainage divide and relate to Cretaceous exhumation (Kamp et al, 1989;Kamp, 2001). Reset and partially annealed zircon FT ages in the Alpine Schist west of the Main Divide indicate that exhumation of the crustal section is mainly a Late Cenozoic feature.…”

Different styles of modern and ancient non-collisional orogens and implications for crustal growth: a Gondwanaland perspective

“…The timing of structuring of the accretionary wedge is at least Middle to Late Jurassic, perhaps due to accretion of the Esk Head Melange, thereby changing its taper and thus deformation mode (e.g., Kamp 2000Kamp , 2001Adams et al 2007). Structuring was thus underway before deposition of the Cretaceous Pahau Terrane and its accretion to the front of the wedge.…”

“…Structuring was thus underway before deposition of the Cretaceous Pahau Terrane and its accretion to the front of the wedge. Kamp (2001) suggested exhumation of Otago-Haast Schist began at ϳ135 Ma in response to the accretionary wedge achieving steady state conditions. The concept of different transport paths for different rocks was taken further by Rahl et al (2011), who suggested rocks on the eastern (prowedge) side of the Otago-Haast culmination had been frontally accreted, whereas those on the western (retrowedge) side had been underplated.…”