Rupert Southerland John Townend Michael J. Allen Leeza Becroft Austin Boles Carolyn Boulton Brett Carpenter Alan K. Cooper Simon C. Cox Christopher Daube Daniel R. Faulkner Angela Halfpenny Naoki Kato Stephen Keys Martina Kirilova Yusuke Kometani Timothy Little Elisabetta Mariani Benjamin L. Melosh Catriona D. Menzies Luiz Morales Chance Morgan Hiroshi Mori Andre Niemeijer Richard Norris David Prior Katrina Sauer Anja Schleicher Norio Shigematsu Damon A.H. Teagle Harold Tobin Robert Valdez Jack Williams Samantha Yeo Laura-May Baratin Nicolas C. Barth Adrian Benson Caroline Boese Bernard Celerier Calum J. Chamberlain Ronald Conze Jamie Coussens Lisa Craw Mai-Linh Doan Jennifer L. Eccles Jason Grieve Julia Grochowski Anton Gulley Jamie Howarth Katrina D. Zamudio Lucie Janku-Capova Tamara Nicole Jeppson Robert M. Langridge Deirdre Mallyon Ray Marx Cecile Massiot Loren Mathewson Josephine Moore Osamu Nishikawa Brent Pooley Alex Pyne Martha K. Savage Doug Schmitt Sam Taylor-Offord Phaedra Upton Konrad C. Weaver Thomas Wiersberg Martin Zimmer Virginia G. Toy 2017 <div class="hlFld-Abstract"><div class="abstractSection abstractInFull"><p>During the second phase of the Alpine Fault, Deep Fault Drilling Project (DFDP) in the Whataroa River, South Westland, New Zealand, bedrock was encountered in the DFDP-2B borehole from 238.5–893.2 m Measured Depth (MD). Continuous sampling and meso- to microscale characterisation of whole rock cuttings established that, in sequence, the borehole sampled amphibolite facies, Torlesse Composite Terrane-derived schists, protomylonites and mylonites, terminating 200–400 m above an Alpine Fault Principal Slip Zone (PSZ) with a maximum dip of 62°. The most diagnostic structural features of increasing PSZ proximity were the occurrence of shear bands and reduction in mean quartz grain sizes. A change in composition to greater mica:quartz + feldspar, most markedly below c. 700 m MD, is inferred to result from either heterogeneous sampling or a change in lithology related to alteration. Major oxide variations suggest the fault-proximal Alpine Fault alteration zone, as previously defined in DFDP-1 core, was not sampled.</p></div></div> application/pdf 10.1080/00288306.2017.1375533 en Taylor & Francis Bedrock geology of DFDP-2B, central Alpine Fault, New Zealand article