scholarly journals Intergranular Pressure Solution in Nacl: Grain-To-Grain Contact Experiments under the Optical Microscope

1999 ◽  
Vol 54 (6) ◽  
pp. 729-750 ◽  
Author(s):  
C. J. Spiers ◽  
P. M. T. M. Schutjens
Keyword(s):  
Optical Microscope ◽  
Pressure Solution ◽  
Intergranular Pressure ◽  
Contact Experiments

scholarly journals Surface microstructures developed on polished quartz crystals embedded in wet quartz sand compacted under hydrothermal conditions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Peter M. Schutjens ◽  
Christopher J. Spiers ◽  
André Rik Niemeijer
Keyword(s):  
Quartz Sand ◽  
Axial Stress ◽  
Dissolution Kinetics ◽  
Confining Pressure ◽  
Pressure Solution ◽  
Hydrothermal Conditions ◽  
Quartz Crystals ◽  
Surface Microstructures ◽  
Quartz Aggregates ◽  
Intergranular Pressure

AbstractIntergranular pressure solution plays a key role as a deformation mechanism during diagenesis and in fault sealing and healing. Here, we present microstructural observations following experiments conducted on quartz aggregates under conditions known to favor pressure solution. We conducted two long term experiments in which a quartz crystal with polished faces of known crystallographic orientation was embedded in a matrix of randomly oriented quartz sand grains. For about two months an effective axial stress of 15 MPa was applied in one experiment, and an effective confining pressure of 28 MPa in the second. Loading occurred at 350 °C in the presence of a silica-saturated aqueous solution. In the first experiment, quartz sand grains in contact with polished quartz prism ($$\overline10{1 }0$$ 1 ¯ 010 ) faces became ubiquitously truncated against these faces, without indenting or pitting them. By contrast, numerous sand-grain-shaped pits formed in polished pyramidal ($$17\overline{6 }3$$ 17 6 ¯ 3 ) and ($$\overline{4 }134$$ 4 ¯ 134 ) crystal faces in the second experiment. In addition, four-leaved and (in some cases) three-leafed clover-shaped zones of precipitation formed on these prism faces, in a consistent orientation and pattern around individual pits. The microstructures observed in both experiments were interpreted as evidence for the operation of intergranular pressure solution. The dependence of the observed indentation/truncation microstructures on crystal face orientation can be explained by crystallographic control of stress-induced quartz dissolution kinetics, in line with previously published experimental and petrographic data, or possibly by an effect of contact orientation on the stress-induced driving force for pressure solution. This should be investigated in future experiments, providing data and microstructures which enable further mechanism-based analysis of deformation by pressure solution and the effect of crystallographic control on its kinetics in quartz-rich sands and sandstones.

scholarly journals Investigating Compaction by Intergranular Pressure Solution Using the Discrete Element Method

2018 ◽  
Vol 123 (1) ◽  
pp. 107-124 ◽  
Author(s):  
M. P. A. van den Ende ◽  
G. Marketos ◽  
A. R. Niemeijer ◽  
C. J. Spiers
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Pressure Solution ◽  
Intergranular Pressure ◽  
Element Method

Effect of High-Pressure Solution Temperature on Corrosion Resistance of AM60 Magnesium Alloy

2012 ◽  
Vol 580 ◽  
pp. 560-563
Author(s):  
Guang Hui Chen
Keyword(s):  
High Pressure ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Solution Treatment ◽  
Optical Microscope ◽  
Solution Temperature ◽  
Pressure Solution ◽  
Different Temperatures ◽  
Increasing Temperature

As-cast AM60 magnesium alloy was solid dissolved under a high-pressure of 4 Gpa at different temperatures. The microstructure of the products was observed by optical microscope and the corrosion resistance of the products was investigated. The results show that increasing temperature during solution treatment promotes the dissolution into α-Mg matrix of β-Mg17Al12 in the alloy and improves the corrosion resistance of AM60 alloy, especially for over 400 °C.

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