Bedrock geology of DFDP-2B, central Alpine Fault, New Zealand

Virginia Gail Toy; Rupert Sutherland; John Townend; Michael John Allen; Leeza Becroft; Austin Boles; Carolyn Boulton; Brett M. Carpenter; Alan Cooper; Simon C. Cox; Christopher Daube; Daniel R. Faulkner; Angela Halfpenny; Naoki Kato; Stephen Keys; Martina Kirilova; Yusuke Kometani; Timothy Little; Elisabetta Mariani; Benjamin Melosh; Catriona D. Menzies; Luiz Morales; Chance Morgan; Hiroshi Mori; André Niemeijer; Richard Norris; David J. Prior; Katrina Sauer; Anja M. Schleicher; Norio Shigematsu; Damon A H Teagle; Harold Tobin; Robert Valdez; Jack Williams; Samantha Yeo; Laura May Baratin; Nicolas Barth; Adrian Benson; Carolin Boese; Bernard Célérier; Calum J. Chamberlain; Ronald Conze; Jamie Coussens; Lisa Craw; Mai Linh Doan; Jennifer Eccles; Jason Grieve; Julia Grochowski; Anton Gulley; Jamie Howarth; DFDP-2 Science Team

doi:10.1080/00288306.2017.1375533

Bedrock geology of DFDP-2B, central Alpine Fault, New Zealand

Virginia Gail Toy^*, Rupert Sutherland, John Townend, Michael John Allen, Leeza Becroft, Austin Boles, Carolyn Boulton, Brett M. Carpenter, Alan Cooper, Simon C. Cox, Christopher Daube, Daniel R. Faulkner, Angela Halfpenny, Naoki Kato, Stephen Keys, Martina Kirilova, Yusuke Kometani, Timothy Little, Elisabetta Mariani, Benjamin MeloshCatriona D. Menzies, Luiz Morales, Chance Morgan, Hiroshi Mori, André Niemeijer, Richard Norris, David J. Prior, Katrina Sauer, Anja M. Schleicher, Norio Shigematsu, Damon A H Teagle, Harold Tobin, Robert Valdez, Jack Williams, Samantha Yeo, Laura May Baratin, Nicolas Barth, Adrian Benson, Carolin Boese, Bernard Célérier, Calum J. Chamberlain, Ronald Conze, Jamie Coussens, Lisa Craw, Mai Linh Doan, Jennifer Eccles, Jason Grieve, Julia Grochowski, Anton Gulley, Jamie Howarth, DFDP-2 Science Team

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

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.

Original language	English
Pages (from-to)	497-518
Number of pages	22
Journal	New Zealand Journal of Geology and Geophysics
Volume	60
Issue number	4
DOIs	https://doi.org/10.1080/00288306.2017.1375533
Publication status	Published - 17 Oct 2017

Keywords

Alpine Fault
cataclasite
mylonite
New Zealand
scientific drilling

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Toy, V. G., Sutherland, R., Townend, J., Allen, M. J., Becroft, L., Boles, A., Boulton, C., Carpenter, B. M., Cooper, A., Cox, S. C., Daube, C., Faulkner, D. R., Halfpenny, A., Kato, N., Keys, S., Kirilova, M., Kometani, Y., Little, T., Mariani, E., ... DFDP-2 Science Team (2017). Bedrock geology of DFDP-2B, central Alpine Fault, New Zealand. New Zealand Journal of Geology and Geophysics, 60(4), 497-518. https://doi.org/10.1080/00288306.2017.1375533

@article{596ed66eff804214be0cea6db13c8125,

title = "Bedrock geology of DFDP-2B, central Alpine Fault, New Zealand",

abstract = "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.",

keywords = "Alpine Fault, cataclasite, mylonite, New Zealand, scientific drilling",

author = "Toy, {Virginia Gail} and Rupert Sutherland and John Townend and Allen, {Michael John} and Leeza Becroft and Austin Boles and Carolyn Boulton and Carpenter, {Brett M.} and Alan Cooper and Cox, {Simon C.} and Christopher Daube and Faulkner, {Daniel R.} and Angela Halfpenny and Naoki Kato and Stephen Keys and Martina Kirilova and Yusuke Kometani and Timothy Little and Elisabetta Mariani and Benjamin Melosh and Menzies, {Catriona D.} and Luiz Morales and Chance Morgan and Hiroshi Mori and Andr{\'e} Niemeijer and Richard Norris and Prior, {David J.} and Katrina Sauer and Schleicher, {Anja M.} and Norio Shigematsu and Teagle, {Damon A H} and Harold Tobin and Robert Valdez and Jack Williams and Samantha Yeo and Baratin, {Laura May} and Nicolas Barth and Adrian Benson and Carolin Boese and Bernard C{\'e}l{\'e}rier and Chamberlain, {Calum J.} and Ronald Conze and Jamie Coussens and Lisa Craw and Doan, {Mai Linh} and Jennifer Eccles and Jason Grieve and Julia Grochowski and Anton Gulley and Jamie Howarth and {DFDP-2 Science Team}",

year = "2017",

month = oct,

day = "17",

doi = "10.1080/00288306.2017.1375533",

language = "English",

volume = "60",

pages = "497--518",

journal = "New Zealand Journal of Geology and Geophysics",

issn = "0028-8306",

publisher = "Taylor and Francis Asia Pacific",

number = "4",

}

Toy, VG, Sutherland, R, Townend, J, Allen, MJ, Becroft, L, Boles, A, Boulton, C, Carpenter, BM, Cooper, A, Cox, SC, Daube, C, Faulkner, DR, Halfpenny, A, Kato, N, Keys, S, Kirilova, M, Kometani, Y, Little, T, Mariani, E, Melosh, B, Menzies, CD, Morales, L, Morgan, C, Mori, H, Niemeijer, A, Norris, R, Prior, DJ, Sauer, K, Schleicher, AM, Shigematsu, N, Teagle, DAH, Tobin, H, Valdez, R, Williams, J, Yeo, S, Baratin, LM, Barth, N, Benson, A, Boese, C, Célérier, B, Chamberlain, CJ, Conze, R, Coussens, J, Craw, L, Doan, ML, Eccles, J, Grieve, J, Grochowski, J, Gulley, A, Howarth, J & DFDP-2 Science Team 2017, 'Bedrock geology of DFDP-2B, central Alpine Fault, New Zealand', New Zealand Journal of Geology and Geophysics, vol. 60, no. 4, pp. 497-518. https://doi.org/10.1080/00288306.2017.1375533

TY - JOUR

T1 - Bedrock geology of DFDP-2B, central Alpine Fault, New Zealand

AU - Toy, Virginia Gail

AU - Sutherland, Rupert

AU - Townend, John

AU - Allen, Michael John

AU - Becroft, Leeza

AU - Boles, Austin

AU - Boulton, Carolyn

AU - Carpenter, Brett M.

AU - Cooper, Alan

AU - Cox, Simon C.

AU - Daube, Christopher

AU - Faulkner, Daniel R.

AU - Halfpenny, Angela

AU - Kato, Naoki

AU - Keys, Stephen

AU - Kirilova, Martina

AU - Kometani, Yusuke

AU - Little, Timothy

AU - Mariani, Elisabetta

AU - Melosh, Benjamin

AU - Menzies, Catriona D.

AU - Morales, Luiz

AU - Morgan, Chance

AU - Mori, Hiroshi

AU - Niemeijer, André

AU - Norris, Richard

AU - Prior, David J.

AU - Sauer, Katrina

AU - Schleicher, Anja M.

AU - Shigematsu, Norio

AU - Teagle, Damon A H

AU - Tobin, Harold

AU - Valdez, Robert

AU - Williams, Jack

AU - Yeo, Samantha

AU - Baratin, Laura May

AU - Barth, Nicolas

AU - Benson, Adrian

AU - Boese, Carolin

AU - Célérier, Bernard

AU - Chamberlain, Calum J.

AU - Conze, Ronald

AU - Coussens, Jamie

AU - Craw, Lisa

AU - Doan, Mai Linh

AU - Eccles, Jennifer

AU - Grieve, Jason

AU - Grochowski, Julia

AU - Gulley, Anton

AU - Howarth, Jamie

AU - DFDP-2 Science Team

PY - 2017/10/17

Y1 - 2017/10/17

N2 - 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.

AB - 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.

KW - Alpine Fault

KW - cataclasite

KW - mylonite

KW - New Zealand

KW - scientific drilling

UR - http://www.scopus.com/inward/record.url?scp=85031489907&partnerID=8YFLogxK

U2 - 10.1080/00288306.2017.1375533

DO - 10.1080/00288306.2017.1375533

M3 - Article

AN - SCOPUS:85031489907

SN - 0028-8306

VL - 60

SP - 497

EP - 518

JO - New Zealand Journal of Geology and Geophysics

JF - New Zealand Journal of Geology and Geophysics

IS - 4

ER -

Bedrock geology of DFDP-2B, central Alpine Fault, New Zealand

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Keywords

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