Gutenberg Open Science: Micro- and nano-porosity of the active Alpine Fault zone, New Zealand

Please use this identifier to cite or link to this item: http://doi.org/10.25358/openscience-5605

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DC Field	Value	Language
dc.contributor.author	Martina, Kirilova	-
dc.contributor.author	Toy, Virginia	-
dc.contributor.author	Sauer, Katrina	-
dc.contributor.author	Renard, François	-
dc.contributor.author	Gessner, Klaus	-
dc.contributor.author	Wirth, Richard	-
dc.contributor.author	Xiao, Xianghui	-
dc.contributor.author	Matsumura, Risa	-
dc.date.accessioned	2021-01-28T11:17:24Z	-
dc.date.available	2021-01-28T11:17:24Z	-
dc.date.issued	2020	-
dc.identifier.uri	https://openscience.ub.uni-mainz.de/handle/20.500.12030/5609	-
dc.description.abstract	Porosity reduction in rocks from a fault core can cause elevated pore fluid pressures and consequently influence the recurrence time of earthquakes. We investigated the porosity distribution in the New Zealand's Alpine Fault core in samples recovered during the first phase of the Deep Fault Drilling Project (DFDP-1B) by using two-dimensional nanoscale and three-dimensional microscale imaging. Synchrotron X-ray microtomography-derived analyses of open pore spaces show total microscale porosities in the range of 0.1 %–0.24 %. These pores have mainly non-spherical, elongated, flat shapes and show subtle bipolar orientation. Scanning and transmission electron microscopy reveal the samples' microstructural organization, where nanoscale pores ornament grain boundaries of the gouge material, especially clay minerals. Our data imply that (i) the porosity of the fault core is very small and not connected; (ii) the distribution of clay minerals controls the shape and orientation of the associated pores; (iii) porosity was reduced due to pressure solution processes; and (iv) mineral precipitation in fluid-filled pores can affect the mechanical behavior of the Alpine Fault by decreasing the already critically low total porosity of the fault core, causing elevated pore fluid pressures and/or introducing weak mineral phases, and thus lowering the overall fault frictional strength. We conclude that the current state of very low porosity in the Alpine Fault core is likely to play a key role in the initiation of the next fault rupture.	en_GB
dc.description.sponsorship	DFG, Open Access-Publizieren Universität Mainz / Universitätsmedizin Mainz	de
dc.language.iso	eng	de
dc.rights	CC BY	*
dc.rights.uri	https://creativecommons.org/licenses/by/4.0/deed.en	*
dc.subject.ddc	550 Geowissenschaften	de_DE
dc.subject.ddc	550 Earth sciences	en_GB
dc.title	Micro- and nano-porosity of the active Alpine Fault zone, New Zealand	en_GB
dc.type	Zeitschriftenaufsatz	de
dc.identifier.doi	http://doi.org/10.25358/openscience-5605	-
jgu.type.dinitype	article	en_GB
jgu.type.version	Published version	de
jgu.type.resource	Text	de
jgu.organisation.department	FB 09 Chemie, Pharmazie u. Geowissensch.	de
jgu.organisation.number	7950	-
jgu.organisation.name	Johannes Gutenberg-Universität Mainz	-
jgu.rights.accessrights	openAccess	-
jgu.journal.title	Solid earth	de
jgu.journal.volume	11	de
jgu.journal.issue	6	de
jgu.pages.start	2425	de
jgu.pages.end	2438	de
jgu.publisher.year	2020	-
jgu.publisher.name	Copernicus Publ.	de
jgu.publisher.place	Göttingen	de
jgu.publisher.uri	https://doi.org/10.5194/se-11-2425-2020	de
jgu.publisher.issn	1869-9529	de
jgu.organisation.place	Mainz	-
jgu.subject.ddccode	550	de
jgu.publisher.doi	10.5194/se-11-2425-2020
jgu.organisation.ror	https://ror.org/023b0x485
Appears in collections:	JGU-Publikationen

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