GEO1115_2021_Activity9.3S

THEME 9 – SEDIMENTARY ROCKS [ 19/24 : B+ ] A CTIVITY 9.3S – I DENTIFICATION OF SEDIMENTARY ROCKS SAMPLES FROM THE KIT ( /24) Reference material: - Lecture of associated theme (Brightspace) - Glossary ( https://mysite.science.uottawa.ca/dumas/ ) - Reference document “Section of the lab manual” in Brightspace Activity: You must identify the name of 8 selected sedimentary rocks samples from your kit. To do this, you need to study the properties of these rocks: texture (grain size, rounding, etc.), composition (clastic particles – quartz, feldspar – calcite, gypsum, etc.). You will need your course notes as well as the reference documents on sedimentary rocks (informative text on sedimentary rocks, sedimentary rocks classification table, and sedimentary rocks worksheets – see “Reference document: section of the Lab Manual” in Brightspace). Thus, you must associate each identified sample number in your kit (see below) with a sedimentary rock name from the list below . We also require that you fill in and submit the sedimentary rocks worksheets for the various samples identified. This will help you, among other things, to make links between the grain size and the energy level associated with the deposition of these sediments (for clastic rocks) as well as to better integrate the general composition of the sediments in each of the three categories of sedimentary rocks. List of the 8 sedimentary rocks to identify: (sedimentary rocks highlighted in yellow in the reference material “Section of the lab manual”) Limestone Shale Rock salt Conglomerate Gypsum rock Sandstone Coal Chert Sample numbers of the kit to identify: 7 : Rock salt 31 : Conglomerate 8 : Gypsum rock 32 : Limestone 29 : Shale 33 : Chert 30 : Sandstone 34 : Coal

Sedimentary Rocks Worksheet List of samples to identify: shale, sandstone, conglomerate, limestone, chert, rock salt, gypsum, coal. COMPOSITION (minerals, rock fragments, plant fragments, etc.) TEXTURE (grain size, roundness, etc.) CATEGORY (clastic, biochemical, chemical) OTHERS (energy level, environment of deposition, formation processes, etc.) ROCK NAME Mainly quartz, feldspars, rock fragments, and clay minerals Siltstone: 0.0039-0.062mm Mudstone: in between the two Claystone: <0.0039mm Clastic Siltstone: predominance of silt and clay, non-fissile Mudstone: about equal proportions of silt and clay, non- fissile Claystone: predominance of clay, non-fissile Shale Mainly quartz, feldspars, rock fragments, and clay minerals Sand (0.062 – 2 mm) Clastic Grains of various compositions Sandstone Mainly quartz, feldspars, rock fragments, and clay minerals Gravel (> 2 mm) Clastic Rounded grains Conglomerate Mainly calcite (CaCO 3 ) various sizes Biochemical Bioclastic sediments, i.e. mainly composed of skeletal fragments Fossiliferous Limestone Mainly calcite (CaCO 3 ) Spherical grains with concentric laminations around a nucleus Chemical Biochemical? formed by precipitation in agitated waters Oolitic Limestone Mainly calcite (CaCO 3 ) microscopic Biochemical Chemical Aggregate of microscopic particles of CaCO 3 Microcrystalline Limestone