Lab 05 - Sedimentary Rock Identification Key

Total Page：16

File Type：pdf, Size：1020Kb

Lab 05 - Sedimentary Rock Identification Key 1. weathering and erosion; lithification 2. no; all except quartz are unstable 3. quartz 4. clay 5. quartz + clay 6. for gravel and sand = cementation; for silt and clay = dehydration + compaction 7. sorting by different sizes 8. detrital = quartz + clay; nondetrital = hardparts of plants or animals & evaporites 9. yes, because most surface water contains some dissolved chemicals in it 10. breccia = little transport and abrasion; conglomerate = much more transport and abrasion 11. both are very fine-grained but, silt is gritty; clay is smooth 12. coal; an organic mineraloid left over from compressed plant material 13. yes, you need lots of waves to move the particles that will be coated with calcite to make ooids 14. taste, rock salt tastes like salt; rock gypsum does not Rock Texture Rock Composition Characteristic Features NAME large angular gray Detrital quartz gravel with quartz cement quartz clasts breccia large rounded gray/ Detrital quartz gravel with calcite cement white quartz clasts conglomerate quartz, muscovite & orthoclase square orthoclase and Detrital arkose sand with hematite cement sparkly muscovite sand Detrital pure quartz sand with calcite cement white quartz sandy rock white arenite pure quartz sand with Detrital reddish quartz sandy rock red arenite hematite cement Detrital very fine gritty quartz greenish-gray gritty rock siltstone flat, black soft rock with Detrital very fine clay plates shale bits of plant fossils broken up fresh bits of coquina Non-detrital fresh calcite seashells sea shells broken up very old bits fossil Non-detrital old calcite seashells of sea shells limestone layers of soft black carbon bituminous Non-detrital carbon with a little sulfur with yellowish sulfur coal white, fluffy, very soft Non-detrital pure gypsum rock gypsum rock, scratch with fingernail tastes like dirty salt, small halite with a little clay Non-detrital grayish cubic crystals rock salt round calcite ooids with small white balls of calcite, oolitic Non-detrital calcite cement can be scratched with a nail limestone.

Copy Link

Recommended publications

Part 629 – Glossary of Landform and Geologic Terms
Title 430 – National Soil Survey Handbook Part 629 – Glossary of Landform and Geologic Terms Subpart A – General Information 629.0 Definition and Purpose This glossary provides the NCSS soil survey program, soil scientists, and natural resource specialists with landform, geologic, and related terms and their definitions to— (1) Improve soil landscape description with a standard, single source landform and geologic glossary. (2) Enhance geomorphic content and clarity of soil map unit descriptions by use of accurate, defined terms. (3) Establish consistent geomorphic term usage in soil science and the National Cooperative Soil Survey (NCSS). (4) Provide standard geomorphic definitions for databases and soil survey technical publications. (5) Train soil scientists and related professionals in soils as landscape and geomorphic entities. 629.1 Responsibilities This glossary serves as the official NCSS reference for landform, geologic, and related terms. The staff of the National Soil Survey Center, located in Lincoln, NE, is responsible for maintaining and updating this glossary. Soil Science Division staff and NCSS participants are encouraged to propose additions and changes to the glossary for use in pedon descriptions, soil map unit descriptions, and soil survey publications. The Glossary of Geology (GG, 2005) serves as a major source for many glossary terms. The American Geologic Institute (AGI) granted the USDA Natural Resources Conservation Service (formerly the Soil Conservation Service) permission (in letters dated September 11, 1985, and September 22, 1993) to use existing definitions. Sources of, and modifications to, original definitions are explained immediately below. 629.2 Definitions A. Reference Codes Sources from which definitions were taken, whole or in part, are identified by a code (e.g., GG) following each definition.
[Show full text]
Beachrock, in Schwartz, ML, Ed., Encyclopedia of Coastal Science
Turner, RJ. 2005. Beachrock, in Schwartz, ML, ed., Encyclopedia of Coastal Science. Kluwer Academic Publishers, The Netherlands. Pp. 183-186. BEACHROCK Formation and Distribution of Beachrock Beachrock is defined by Scoffin and Stoddart (1987, 401) as "the consolidated deposit that results from lithification by calcium carbonate of sediment in the intertidal and spray zones of mainly tropical coasts." Beachrock units form under a thin cover of sediment and generally overlie unconsolidated sand, although they may rest on any type of foundation. Maximum rates of subsurface beachrock cementation are thought to occur in the area of the beach that experiences the most wetting and drying - below the foreshore in the area of water table excursion between the neap low and high tide levels (Amieux et al, 1989; Higgins, 1994). Figure B49 shows a beachrock formation displaying typical attributes. Figure B49 Multiple unit beachrock exposure at barrio Rio Grande de Aguada, Puerto Rico. The sculpted morphology, development of a nearly vertical landward edge, and dark staining of outer surface by cyanobacteria indicate that this beachrock has experience extended exposure. Landward relief and imbricate morphology of beachrock units define shore- parallel runnels that impound seawater (photo R. Turner). There are a number of theories regarding the process of beach sand cementation. Different mechanisms of cementation appear to be responsible at different localities. The primary mechanisms proposed for the origin of beachrock cements are as follows: 1)
[Show full text]
Sedimentary Rock Formation Models
Sedimentary Rock Formation Models 5.7 A Explore the processes that led to the formation of sedimentary rock and fossil fuels. The Formation Process Explained • Formation of these rocks is one of the important parts of the rock cycle. For millions of years, the process of deposition and formation of these rocks has been operational in changing the geological structure of earth and enriching it. Let us now see how sedimentary rocks are formed. Weathering The formation process begins with weathering of existent rock exposed to the elements of nature. Wind and water are the chisels and hammers that carve and sculpt the face of the Earth through the process of weathering. The igneous and metamorphic rocks are subjected to constant weathering by wind and water. These two elements of nature wear out rocks over a period of millions of years creating sediments and soil from weathered rocks. Other than this, sedimentation material is generated from the remnants of dying organisms. Transport of Sediments and Deposition These sediments generated through weathering are transported by the wind, rivers, glaciers and seas (in suspended form) to other places in the course of flow. They are finally deposited, layer over layer by these elements in some other place. Gravity, topographical structure and fluid forces decide the resting place of these sediments. Many layers of mineral, organics and chemical deposits accumulate together for years. Layers of different deposits called bedding features are created from them. Crystal formation may also occur in these conditions. Lithification (Compaction and Cementation) Over a period of time, as more and more layers are deposited, the process of lithification begins.
[Show full text]
Weathering Transportation Deposition Sediments Sedimantary Rocks
Weathering Transportation Deposition Uplift & exposure Sediments Igneous rocks (extrusive) Lithification Pyroclastic (Compaction and material Cementation) Consolidation Sedimantary rocks Igneous rocks (ıntrusion) Metamorphic Crystallization rocks Melting Prof.Dr.Kadir Dirik Lecture Notes Prof.Dr.Kadir Dirik Lecture Notes Sediment and Sedimentary Rocks The term sediment refers to (1) all solid particles of preexisting rocks yielded by mechanical and chemical weathering, (2) minerals derived from solutions containing materials dissolved during chemical weathering and (3) minerals extracted from sea water by organisms to build their shell. Sedimentary rock is simply any rock composed of sediments. 2 Prof.Dr.Kadir Dirik Lecture Notes Sedimentary rocks cover about two thirds of the continents and most of the seafloor, except spreading ridges. All rocks are important to understand the Earth history, but sedimentary rocks play a special role because they preserve evidence of surface processes responsible for them.By studying sedimentary rocks we can determine past distribution of streams, lakes, deserts, glaciers, and shorelines. They also make interferences about ancient climates and biosphere. In adition, some sediments and sedimentary rocks are themselves natural resources, or they are the host for resources such as petroleum and natural gas. Depositional Processes (Çökelme Süreçleri) Weathering & Erosion, Transportation, Deposition / Sedimentation and Diagenesis. Weathering & Erosion Weathering and erosion are the fundamental processes in the origin of sediment. During this process two types of sediments are produced: detrital sediments and chemical sediments. 3 Prof.Dr.Kadir Dirik Lecture Notes Ayrışma/bozunma erozyon Taşınma ve Çökelme/depolanma Gömülme ve taşlaşma 4 Prof.Dr.Kadir Dirik Lecture Notes Detrital Sediments. are all particles derived from any type of weathering.
[Show full text]
Concretions, Nodules and Weathering Features of the Carmelo Formation
Concretions, nodules and weathering features of the Carmelo Formation The features that characterize a sedimentary rock can form at chemical origin and include nodules and concretions. diverse times and under very different conditions. Geologists Deformational features result from the bending, buckling, or divide these features into four classes. Depositional features breaking of sedimentary strata by external forces. Surficial form while the sediment is accumulating. They can tell a much (weathering) features develop in a rock at or near the about the ancient environment of deposition and include many surface where it is subject to groundwater percolation. These examples in the Carmelo Formation. Diagenetic features features can reflect both physical and chemical processes. a develop after the sediment has accumulated and can include number of examples exist in the rocks of Point Lobos. (See link the transition from sediment to rock. They typically have a to The Rocks of Point Lobos for further descriptions). Depositional Diagenetic Deformational Surficial Features that form as Features that form after Features that develop Features that form while the the sediment the sediment was anytime after deposition rock is exposed at or near accumulates deposited until it becomes and reflect the bending, the present-day land surface a rock swirling, or breaking of the stratification Examples: Examples: Examples: Examples: Bedding (layering, Nodules “Convolute lamination” Iron banding stratification) Concretions Slump structure Honeycomb Grain size Lithification (rock Tilting weathering Grain organization formation) Folds Color change (grading, pebble Faults orientation, imbrication) Ripple marks Ripple lamination Trace fossils Erosional scours Channels Features of a sedimentary rock sorted according to their origin.
[Show full text]
Scientist Guide the Crayon Rock Cycle
Scientist Guide The Crayon Rock Cycle Introduction Soil is one of Earth’s most important natural resources. It is the bridge between the living and non- living worlds and ultimately where most of our food originates. Soil is composed of organic materi- al (humus), water, air and minerals. Rocks are mixtures of minerals such as quartz, feldspar, mica and calcite. They are the source of all soil mineral material and the origin of all plant nutrients with the exception of nitrogen, hydrogen and carbon. As rock is chemically and physically weathered, eroded and precipitated, it is trans- formed into soil. The rock cycle shows how rocks change over time by a variety of physical and chemical processes (see Figure 1). Natural processes that are part of the rock cycle include weathering, erosion, lithifi- cation, metamorphism, melting and cooling. • Weathering involves both the chemical and physical IGNEOUS ROCK Weathering breakdown of rock at or near the Earth’s surface. and Erosion Cooling This results in accumulation of sediments – loose materials, such as rock and mineral fragments, or Sediment Magma pieces of animal and plant remains that have been transported. Lithiﬁcation (Compaction and Cementation) Melting • Erosion is the process by which soil and rock are removed from the Earth’s surface by exogenic SEDIMENTARY METAMORPHIC processes, such as wind or water flow, and then ROCK ROCK transported and deposited in other locations. Metamorphism (Heat and/or Pressure) • Lithification is the transformation of sediment into rock. The main processes involved in lithification are: Figure 1. o Cementation – large sediments are held together by natural cements.
[Show full text]
Sedimentary Rocks and Sedimentary Basins
Reading Sedimentary • Stanley, S.M., 2015, Sedimentary Environments, – Ch. 5. Earth Systems History Rocks and • On Ecampus Sedimentary Basins What is a Sedimentary Basin? Sedimentary Rocks – A thick accumulation of sediment – Necessary conditions: •Intro 1. A depression (subsidence) • Origin of sedimentary rocks 2. Sediment Supply – Clastic Rocks – Carbonate Sedimentary Rocks • Interpreting Sedimentary Rocks – Environment of deposition • Implications for the Petroleum System World Map of Sedimentary Basins Where are the Sedimentary Basins? 6 A B Watts Our Peculiar Planet: The Rock Cycle Liquid Water and Plate Tectonics Hydrologic Cycle Tectonics http://www.dnr.sc.gov/geology/images/Rockcycle-pg.pdf 8 SEDIMENT 3 Basic Types of Sedimentary Rocks • Unconsolidated products of Weathering & Erosion • Detrital ( = Clastic) – Loose sand, gravel, silt, mud, etc. – Made of Rock Fragments – Transported by rivers, wind, glaciers, currents, etc. • Biochemical – Formed by Organisms • Sedimentary Rock: – Consolidated sediment • Chemical – Lithified sediment – Precipitated from Chemical Solution Detrital Material Transported by a River Formation of a Sedimentary Rocks 1. Weathering – mechanical & chemical 2. Transport – by river, wind, glacier, ocean, etc. 3. Deposition – in a point bar, moraine, beach, ocean basin, etc 4. Lithification – loose sediment turns to solid rock Processes during Transport • 1. Sorting – Grain size is related to energy of transport – Boulders high energy environment – Mud low energy Facies: Rock unit characteristic of a depositional
[Show full text]
How Fast Do Rocks Form?
The Proceedings of the International Conference on Creationism Volume 1 Print Reference: Volume 1:II, Page 197-204 Article 44 1986 How Fast Do Rocks Form? Kurt Wise Follow this and additional works at: https://digitalcommons.cedarville.edu/icc_proceedings DigitalCommons@Cedarville provides a publication platform for fully open access journals, which means that all articles are available on the Internet to all users immediately upon publication. However, the opinions and sentiments expressed by the authors of articles published in our journals do not necessarily indicate the endorsement or reflect the views of DigitalCommons@Cedarville, the Centennial Library, or Cedarville University and its employees. The authors are solely responsible for the content of their work. Please address questions to [email protected]. Browse the contents of this volume of The Proceedings of the International Conference on Creationism. Recommended Citation Wise, Kurt (1986) "How Fast Do Rocks Form?," The Proceedings of the International Conference on Creationism: Vol. 1 , Article 44. Available at: https://digitalcommons.cedarville.edu/icc_proceedings/vol1/iss1/44 HOW FAST DO ROCKS FORM? Kurt Wise ABSTRACT Geologists typically maintain that the crustal rocks cannot be formed in less than millions of years. Creationists typically maintain that at catastrophic rates, all the earth's surface rocks could form rapidly. Several rock types are studied to test the validity of the creationist claim. Examples include basalts, granites, metamorphic rocks, shales, limestones and sandstones. Non-creationist geologists typically maintain that the rocks on the earth's surface could only be created over long periods of time. It is claimed that it would be quite impossi ble to form all the rocks of the earth in a 6,000 year history.
[Show full text]
Glossary of Geological Terms
GLOSSARY OF GEOLOGICAL TERMS These terms relate to prospecting and exploration, to the regional geology of Newfoundland and Labrador, and to some of the geological environments and mineral occurrences preserved in the province. Some common rocks, textures and structural terms are also defined. You may come across some of these terms when reading company assessment files, government reports or papers from journals. Underlined words in definitions are explained elsewhere in the glossary. New material will be added as needed - check back often. - A - A-HORIZON SOIL: the uppermost layer of soil also referred to as topsoil. This is the layer of mineral soil with the most organic matter accumulation and soil life. This layer is not usually selected in soil surveys. ADIT: an opening that is driven horizontally (into the side of a mountain or hill) to access a mineral deposit. AIRBORNE SURVEY: a geophysical survey done from the air by systematically crossing an area or mineral property using aircraft outfitted with a variety of sensitive instruments designed to measure variations in the earth=s magnetic, gravitational, electro-magnetic fields, and/or the radiation (Radiometric Surveys) emitted by rocks at or near the surface. These surveys detect anomalies. AIRBORNE MAGNETIC (or AEROMAG) SURVEYS: regional or local magnetic surveys that measures deviations in the earth=s magnetic field and carried out by flying a magnetometer along flight lines on a pre-determined grid pattern. The lower the aircraft and the closer the flight lines, the more sensitive is the survey and the more detail in the resultant maps. Aeromag maps produced from these surveys are important exploration tools and have played a major role in many major discoveries (e.g., the Olympic Dam deposit in Australia).
[Show full text]
Glossary Cementation Part of Lithification That Involves Minerals Crystallizing in Pore Space and Holding Sediments Together, Hardening the Sediment
Glossary cementation Part of lithification that involves minerals crystallizing in pore space and holding sediments together, hardening the sediment. This happens when water flows through pores between sediments. Ions in the water will combine to form minerals (crystals) that fill the pores, holding the sediments together. Some sedimentary rocks are "well cemented." making them quite hard. Some sedimentary rocks are "poorly cemented" and may crumble in your hand. Quartz and calcite are the two minerals that most commonly form the cement in sedimentary rocks. chemical sedimentary rock Rocks formed by an accumulation and lithification of minerals that crystallized in water. Because the water must be saturated with ions to form these minerals, these rocks most often form in oceans (ions make seawater taste salty). These rocks include those made of minerals crystallized by organisms, which are sometimes called biochemical or bioclastic sedimentary rocks. Limestone, chert, rock salt, and rock gypsum are all types of chemical sedimentary rocks. chemical weathering Processes that break a rock apart by changing the chemical composition of minerals or dissolving minerals entirely. For example, salt dropped into a glass of water will dissolve, in which case it will change from the mineral (NaCl) to ions (Na+ and Cl-) that float about in the water. Another example is rust, in which oxygen enters an iron-bearing mineral and changes it into a different (oxidized and smaller) mineral. Chemical weathering is responsible for making the oceans salty and creating all of the clay minerals on Earth. Clay minerals form when feldspar (the most common minerals in Earth's crust) chemically weather.
[Show full text]
A Partial Glossary of Spanish Geological Terms Exclusive of Most Cognates
U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY A Partial Glossary of Spanish Geological Terms Exclusive of Most Cognates by Keith R. Long Open-File Report 91-0579 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 1991 Preface In recent years, almost all countries in Latin America have adopted democratic political systems and liberal economic policies. The resulting favorable investment climate has spurred a new wave of North American investment in Latin American mineral resources and has improved cooperation between geoscience organizations on both continents. The U.S. Geological Survey (USGS) has responded to the new situation through cooperative mineral resource investigations with a number of countries in Latin America. These activities are now being coordinated by the USGS's Center for Inter-American Mineral Resource Investigations (CIMRI), recently established in Tucson, Arizona. In the course of CIMRI's work, we have found a need for a compilation of Spanish geological and mining terminology that goes beyond the few Spanish-English geological dictionaries available. Even geologists who are fluent in Spanish often encounter local terminology oijerga that is unfamiliar. These terms, which have grown out of five centuries of mining tradition in Latin America, and frequently draw on native languages, usually cannot be found in standard dictionaries. There are, of course, many geological terms which can be recognized even by geologists who speak little or no Spanish.
[Show full text]
Erosion, Weathering, and Change Activity Guide
National Park Service U.S. Department of the Interior Zion National Park Weathering, Erosion, and Change Geologic Events in Zion PHOTO CREDIT Contents Introduction 2 Core Connections 2 Background 2 Activities Earth’s Power Punches 4 Rock On, Zion 5 It Happened Here! 6 Glossary 8 References 9 Introduction This guide contains background information about how weathering, erosion, and other geologic processes such as volcanoes continually shape the landscape, and directions for three activities that will help students better understand how these processes are at work in Utah. This guide is specifically designed for fifth grade classrooms, but the activities can be NPS modified for students at other levels. Theme of deposition (sedimentation), lithification, The Earth’s surface is a dynamic system that is uplift, weathering, erosion, tectonics, and constantly changing due to weathering, volcanic activity make the park a showcase for erosion, floods, earthquakes, volcanoes, and changing landscapes. other geologic events. Deposition (Sedimentation) Focus Zion National Park was a relatively flat basin The activities focus on relationship between near sea level 275 million years ago, near the NPS/MARC NEIDIG geologic processes such as weathering and coast of Pangaea, the land area believed to erosion and changes on the Earth’s surface. have once connected nearly all of the earth’s landmasses together. As sands, gravels, and Activities muds eroded from surrounding mountains, Earth’s Power Punches streams carried these materials into the Students view a presentation of digital im- basin and deposited them in layers. The sheer ages showing the forces that shape the Earth’s weight of these accumulated layers caused surface.
[Show full text]