siltstone


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siltstone

[′silt‚stōn]
(geology)
Indurated silt having a shalelike texture and composition. Also known as siltite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
- A large 2km by 1km soil anomaly with peak value of 1200ppm Zn and 700ppm Pb is associated with andesitic volcaniclastics and siltstones. Random grab sampling returned anomalous Zn to 0.7% and Pb to 0.62%.
Strata: Triassic limestone (ST1); Triassic Xujiahe Formation sandstone (ST2); lower Jurassic Ziliujing Formation siltstone (ST3); middle Jurassic Shaximiao Formation siltstone (ST4); upper Jurassic Suining Formation sand-mudstone (ST5).
Above the boundary, coarse-grained sandstone composed of feldspars and quartz was identified as the incised valley filling in the lowstand systems tract (LST), while under the boundary, bituminous siltstone interbedded with silty mudstone was deposited in a lakeshore environment.
Within the outcrops under consideration, the Ishim Formation combines beds of uneven-grained sands and bleached pelitic siltstone and represents an unified formation of up to 20 m thick (Astapov, 1977).
Figure 2 demonstrates that the resultant stress-strain curves of the uniaxial compression of siltstone were categorized into the following four phases:
The exposed section of the Bara Formation in Lakhra areas is 20 meter thick; it is located, near Lailian Nala, and is composed of sandstone, shale and minor siltstone. The sandstones are yellow, purple, white and red in colors, loose, friable, poorly sorted, unconsolidated - consolidated, and cross-bedded [3].
Table 1--Rock Types and Explosive Loads Explosive Load Explosive Rock Type (grains/ft.) Load (g/m) Siltstone 100 21 Sandstone 250 53 Shale 300 64 Limestone 550 117 Granite 700 149 Table 2--Young's Modulus Study (Konya and Konya) Young's Explosive Explosive Modulus Load Load Rock Type (GPa) (grains/ft.) (kg/m) Siltstone 8.5 100 0.021 Sandstone 15 250 0.053 Shale 20 300 0.064 Limestone 30 550 0.117 Granite 40 700 0.149 Table 3--Compressive Strength to Crains Per Ft.
Key words: Murree Formation, sandstone, siltstone, aggregate, Loss Angeles abrasion test.
[[sigma].sub.ci] Rock mass (MPa) mi GSI index Marl & Mudstone 1 7 30 Silty marl & siltstone 5 7 35 Sandstone 18.3 17 45 Table 2: Calculated constants of Hoek-Brown failure criterion for rock masses at Safa Dam site.
The TBMs mined the tunnel through mixed ground conditions of dolomitic siltstone, clay stone, mudstone, and gypsum without causing any adverse surface settlements.
The 750-tonne and 110-metre long TBM, with its trailing backup equipment, is used to drill through mixed ground conditions of dolomitic siltstone, claystone, mudstone and gypsum without incident.