METAMORPHIC ZONES, TERRANES, AND CENOZOIC FAULTS IN THE MARLBOROUGH SCHIST, NEW-ZEALAND

The northeast-striking Picton Fault Zone is a major structural and met amorphic break that divides the Marlborough-Schist into two separate b locks. The northwestern (Kaituna) block shows a regular increase in te xtural and metamorphic grade to the southeast from prehnite-pumpellyit e to greenschist facies and textural zone I to IV. The southeastern (A rapawa) block shows an irregular increase in grade to the southeast fr om prehnite-pumpellyite to pumpellyite-actinolite facies and textural zone I to IIB. The Kaituna block is correlated with the Caples and Tor lesse Terranes and the Otago Schist of the southern South Island. The Arapawa block is correlated with the Waipapa Terrane (possibly also th e Torlesse Terrane) and Kaimanawa Schist of the North Island. Isotects and the Picton Fault Zone are dextrally offset by 10-15 km across the ENE-striking Queen Charlotte Fault Zone. The latter should be include d with the late Cenozoic Marlborough faults.