Biotite supports long-range diffusive transport in dissolution–precipitation creep in halite through small porosity fluctuations
-
Published:2022-01-10
Issue:1
Volume:13
Page:41-64
-
ISSN:1869-9529
-
Container-title:Solid Earth
-
language:en
-
Short-container-title:Solid Earth
Author:
Schwichtenberg Berit, Fusseis FlorianORCID, Butler Ian B., Andò EdwardORCID
Abstract
Abstract. Phyllosilicates are generally regarded to have a reinforcing effect on chemical compaction by dissolution–precipitation creep (DPC) and thereby
influence the evolution of hydraulic rock properties relevant to groundwater resources and geological repositories as well as fossil fuel
reservoirs. We conducted oedometric compaction experiments on layered NaCl–biotite samples to test this assumption. In particular, we aim to analyse
slow chemical compaction processes in the presence of biotite on the grain scale and determine the effects of chemical and mechanical feedbacks. We
used time-resolved (4-D) microtomographic data to capture the dynamic evolution of the porosity in layered NaCl–NaCl/biotite samples over 1619 and
1932 h of compaction. Percolation analysis in combination with advanced digital volume correlation techniques showed that biotite grains influence
the dynamic evolution of porosity in the sample by promoting a reduction of porosity in their vicinity. However, the lack of preferential strain
localisation around phyllosilicates and a homogeneous distribution of axial shortening across the sample suggests that the porosity reduction is not
achieved by pore collapse but by the precipitation of NaCl sourced from outside the NaCl–biotite layer. Our observations invite a renewed discussion
of the effect of phyllosilicates on DPC, with a particular emphasis on the length scales of the processes involved. We propose that, in our
experiments, the diffusive transport processes invoked in classical theoretical models of DPC are complemented by chemo-mechanical feedbacks that
arise on longer length scales. These feedbacks drive NaCl diffusion from the marginal pure NaCl layers into the central NaCl–biotite mixture over
distances of several hundred micrometres and several grain diameters. Such a mechanism was first postulated by Merino et al. (1983).
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Earth-Surface Processes,Geochemistry and Petrology,Geology,Geophysics,Soil Science
Reference57 articles.
1. Aharonov, E. and Katsman, R.:
Interaction between pressure solution and clays in stylolite development: Insights from modeling,
Am. J. Sci.,
309, 607–632, https://doi.org/10.2475/07.2009.04, 2009. a 2. Arganda-Carreras, I., Kaynig, V., Rueden, C., Eliceiri, K. W., Schindelin, J., Cardona, A., and Sebastian Seung, H.:
Trainable Weka Segmentation: a machine learning tool for microscopy pixel classification,
Bioinformatics,
33, 2424–2426, https://doi.org/10.1093/bioinformatics/btx180, 2017. a 3. Bons, P. D. and Urai, J. L.:
Experimental deformation of two-phase rock analogues,
Mat. Sci. Eng. A,
175, 221–229, https://doi.org/10.1016/0921-5093(94)91061-8, 1994. a 4. Bruthans, J., Soukup, J., Vaculikova, J., Filippi, M., Schweigstillova, J., Mayo, A. L., Masin, D., Kletetschka, G., and Rihosek, J.:
Sandstone landforms shaped by negative feedback between stress and erosion,
Nat. Geosci.,
7, 597–601, https://doi.org/10.1038/ngeo2209, 2014. a 5. Buades, A., Coll, B., and Morel, J.-M.:
Non-local means denoising,
Image Processing On Line,
1, 208–212, https://doi.org/10.5201/ipol.2011.bcm_nlm, 2011. a
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|