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

Abstract

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 sizemore » and sorting degree increase downslope on the downwind side of sand dunes due to a sieving process of the wind-blown grains. Furthermore, the transition of wiggly CB types in this regard correlates with increasing sorting and perhaps with increasing porosity downslope.« less

Authors:
 [1];  [2];  [3];  [2]
  1. Nanjing Univ., Nanjing (China); Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States)
  3. Stanford Univ., Stanford, CA (United States); Sinopec Group, Beijing (China)
Publication Date:
Research Org.:
The Leland Stanford Junior Univ., Palo, Alto, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1468439
Alternate Identifier(s):
OSTI ID: 1402308
Grant/Contract Number:  
FG02-04ER15588; DE‐FG02‐04ER15588
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 120; Journal Issue: 12; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; wiggly compaction band; formation mechanism; sandstone deformation; porosity; grain sorting

Citation Formats

Liu, Chun, Pollard, David D., Deng, Shang, and Aydin, Atilla. Mechanism of formation of wiggly compaction bands in porous sandstone: 1. Observations and conceptual model. United States: N. p., 2015. Web. doi:10.1002/2015JB012372.
Liu, Chun, Pollard, David D., Deng, Shang, & Aydin, Atilla. Mechanism of formation of wiggly compaction bands in porous sandstone: 1. Observations and conceptual model. United States. doi:10.1002/2015JB012372.
Liu, Chun, Pollard, David D., Deng, Shang, and Aydin, Atilla. Tue . "Mechanism of formation of wiggly compaction bands in porous sandstone: 1. Observations and conceptual model". United States. doi:10.1002/2015JB012372. https://www.osti.gov/servlets/purl/1468439.
@article{osti_1468439,
title = {Mechanism of formation of wiggly compaction bands in porous sandstone: 1. Observations and conceptual model},
author = {Liu, Chun and Pollard, David D. and Deng, Shang and Aydin, Atilla},
abstractNote = {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. Furthermore, the transition of wiggly CB types in this regard correlates with increasing sorting and perhaps with increasing porosity downslope.},
doi = {10.1002/2015JB012372},
journal = {Journal of Geophysical Research. Solid Earth},
number = 12,
volume = 120,
place = {United States},
year = {2015},
month = {11}
}

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    Works referencing / citing this record:

    Mechanism of formation of wiggly compaction bands in porous sandstone: 2. Numerical simulation using discrete element method
    journal, December 2015

    • Liu, Chun; Pollard, David D.; Gu, Kai
    • Journal of Geophysical Research: Solid Earth, Vol. 120, Issue 12
    • DOI: 10.1002/2015jb012374

    Multiscale Study of Physical and Mechanical Properties of Sandstone in Three Gorges Reservoir Region Subjected to Cyclic Wetting–Drying of Yangtze River Water
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    Viscoplastic Interpretation of Localized Compaction Creep in Porous Rock
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    • Journal of Geophysical Research: Solid Earth, Vol. 124, Issue 10
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    Damage to the Microstructure and Strength of Altered Granite under Wet–Dry Cycles
    journal, December 2018