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Conglomerate samples
Conglomerate samples
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Conglomerate samples
These siliciclastic rocks are conglomerates varying in textural maturity, sorting, and roundness. Conglomerates are composed of a framework of coarse clasts (>2 mm) enclosed in a fine-grained matrix of sand, silt, and/or mud particles. Sample A is an intraformational conglomerate due to the coarser clasts and finer matrix being of the same provenance, as well as the deformational fractures within the clast. Image A' is the cross-sectional view of sample A. This sample is also the most mature because it is well-sorted and well-rounded in addition to being matrix supported. Samples B and C are both extraformational because of the variation in colour between the clasts and the matrix. This indicates a difference in composition and provenance. Both samples display very poor sorting. Sample B is paraconglomerate (matrix-supported) with sub-rounded to well-rounded grains while Sample C is an orthoconglomerate (grain-supported) with subangular grains and is the most texturally immature. Sample D is similar to Sample A in having coarser, well-rounded clasts, but is grain-supported. The poor sorting of pebble-sized clasts, smaller fragments, and the fine-grained matrix in between clasts, as well as having poor sphericity, consisting of elongated clasts with no preferred orientation make this sample texturally immature.
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Date
09/07/2018
Creator
Dolphin, Glenn
Digital Publisher
Calgary : University of Calgary
Location
Country
Canada
Municipality
City of Calgary
How can you use this image?
Permitted uses are outlined in License and Usage Rights. Usage Restrictions can only be waived by the copyright holder. Add to cart and make a request if you have any questions.
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In Copyright
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Conditions of Use
https://libanswers.ucalgary.ca/faq/199047
License URL
https://creativecommons.org/licenses/by/4.0/
License
CC BY 4.0
Attribution
Attribution
Conglomerate samples, 2018, (CU125599) by Dolphin, Glenn, is used under CC BY 4.0. Courtesy of Geoscience Images Collection, Libraries and Cultural Resources Digital Collections, University of Calgary.