The strength anisotropy of localized compaction: A model for the role of the nature and orientation of cross‐beds on the orientation and distribution of compaction bands in 3‐D

Deng, Shang; Aydin, Atilla

doi:10.1002/2014jb011689

Cited by 20 publications

(2 citation statements)

References 74 publications

(138 reference statements)

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“…Deng and Aydin [2012] investigated the influences of cross-beds on the distribution of compaction bands in this sandstone. The primary mechanical reason for their distribution is thought to be the strength anisotropy of localized compaction [Deng and Aydin, 2015] induced by the cross-bedding [Deng et al, 2015b].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of formation of wiggly compaction bands in porous sandstone: 1. Observations and conceptual model

et al. 2015

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Field observations are combined with microscopic analyses to investigate the mechanism of formation of wiggly compaction bands (CBs) in the porous Jurassic aeolian Aztec Sandstone exposed at Valley of Fire State Park, Nevada. Among the three types of CBs (T1, T2, and T3), we focused on the wiggly CBs (T3), which show a chevron (T31) or wavy (T32) pattern with typical corner angles of approximately 90° or 130°, respectively. Where corner angles of wiggly CBs increase to 180°, they become straight CBs (T33). Image analyses of thin sections using an optical microscope show host rock porosity increases downslope in this dune, and the predominant type of wiggly CBs also varies from chevron to straight CBs. Specifically, band type varies continuously from chevron to wavy to straight where the porosity and grain sorting of the host rock increase systematically. Based on the crack and anticrack models, we infer that the change from chevron to straight CBs is due to increasing failure angle of the sandstone and this may correlate with increasing grain sorting. Wavy CBs with intermediate failure angle and host rock porosity are an intermediate stage between chevron and straight CBs. Previous sedimentological studies also have suggested that grain size and sorting degree increase downslope on the downwind side of sand dunes due to a sieving process of the wind‐blown grains. Therefore, the transition of wiggly CB types in this regard correlates with increasing sorting and perhaps with increasing porosity downslope.

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Section: Introductionmentioning

confidence: 99%

Mechanism of formation of wiggly compaction bands in porous sandstone: 1. Observations and conceptual model

et al. 2015

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“…These authors demonstrated that the compaction band domains (assemblages of compaction bands of different orientations) are mostly confined within the depositional domains (dune units characterized by certain cross-beds orientation therein). This phenomenon could be related to the strength anisotropy of localized compaction (Deng and Aydin, 2015) induced by the cross-bedding related anisotropy, which was measured to be about 13% (Deng et al, 2015a). Because…”

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confidence: 96%

The dynamics and interaction of compaction bands in Valley of Fire State Park, Nevada (USA): Implications for their growth, evolution, and geostatistical property

et al. 2015

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Geometry, geostatistics and microstructures of two sets of high-angle compaction bands within AztecSandstone are investigated for the purpose of characterizing their dimensions, distributions, and growth dynamics. Both sets generally terminate at the dune boundaries. The first set of compaction bands is longer than the second set, which is thought to be controlled by the depositional architecture. The macroscopic thickness of single compaction bands varies from zero at their tips to maximum values, 3 to 10 mm commonly within the central parts. The compaction bands often cluster into zones, the thickness of which increases by addition of a new band sub-parallel to the previously formed bands. The average thickness of a given zone does not change significantly except for a limited number of places along their lengths and a high thickness/distance gradient at their ends. The high thickness anomalies in the thickness distribution plots along the zones correspond to local complexities such as eye structures, steps, and intersections of converging or diverging bands and may reach to about 35 cm. Microstructural analysis of single compaction bands highlights the presence of two typical portions, a thin portion and a thick portion. The thin portion of the band contains pockets of tightly packed grains surrounded by large pores in the band. The thick portion is characterized by an almost homogeneously distributed compaction throughout the band. The thin A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 2 portions are found close to the tips, whereas the thick portions occur primarily in the central parts of the bands. Two other characteristics of both single bands and zones of bands in high resolutionimages are that their thicknesses appear to be smaller and that their lateral boundaries are unexpectedly rough with respect to their appearance in outcrops and hand samples, the latter of which may play an important role in their lateral growth.

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Impacts of bedding angle and cementation type of bedding planes on mechanical behavior of thin-layer structured bedded rocks under uniaxial compression

Liu,

Luo,

et al. 2023

Geomechanics for Energy and the Environment

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The strength anisotropy of localized compaction: A model for the role of the nature and orientation of cross‐beds on the orientation and distribution of compaction bands in 3‐D

Cited by 20 publications

References 74 publications

Mechanism of formation of wiggly compaction bands in porous sandstone: 1. Observations and conceptual model

Mechanism of formation of wiggly compaction bands in porous sandstone: 1. Observations and conceptual model

The dynamics and interaction of compaction bands in Valley of Fire State Park, Nevada (USA): Implications for their growth, evolution, and geostatistical property

Impacts of bedding angle and cementation type of bedding planes on mechanical behavior of thin-layer structured bedded rocks under uniaxial compression

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