The Pikikiruna nappe, northwest Nelson

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Abstract
Recumbent folding on NNW‐SSE axes in the Pikikiruna Schist and Ordovician Arthur Marble of the Pikikiruna Range, northwest Nelson, New Zealand, was accompanied by almandinegarnet‐ grade metamorphism. Observations in the Rameka Creek area indicate that this deformation and metamorphism predate the intrusion of Rameka Gabbro (367 Ma) thus placing the metamorphism in the Silurian‐Devonian periods. Structural models for the Paleozoic metasediments of the Pikikiruna Range are outlined. Favoured is a model involving clockwise rotation (looking from the south) and inversion of the sedimentary sequence in a ductile shear zone (formed in excess of 15 km depth) subsequently extruded near the surface as a nappe, here named informally, the Pikikiruna nappe . In this model, the Pikikiruna Schist is younger than the Arthur Marble and is correlated with the Silurian Hailes Quartzite.

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