All Felsic rocks contain a high percentage of silica. Composition of igneous rocks reflects the chemistry of the original magma. The word 'felsic' was made up from parts of those words. {{courseNav.course.topics.length}} chapters | Many specimens are so full of bubbly vesicles that they are less dense than water. Felsic magmas are the most viscous because of their high silica content. Examples of felsic igneous rocks are granite, rhyolite, and pumice. Once you have determined the texture and composition of an igneous rock, you can name it and you can also say something important about how it formed. The intrusion of large bodies of granite—batholiths—is usually part of the origin of a mountain range. A classic example of a felsic igneous rock is granite, which is mainly composed of quartz (SiO2) and feldspar (potassium-rich and sodium-calcium rich varieties exist) with minor amounts of other minerals (biotite or amphibole). Study.com has thousands of articles about every Therefore, rocks are divided into ultramafic, mafic, intermediate, and felsic. This is an order showing increased silica content. [citation needed] That usage, with the contrasting term "basic rock", was based on an incorrect idea, dating from the 19th century, that "silicic acid" was the chief form of silicon occurring in rocks. Suzanne has taught college economics, geography, and statistics, and has master's degrees in agricultural economics and marine affairs (marine resource management). Earn Transferable Credit & Get your Degree, Bowen's Reaction Series: Crystallization Process & Magmatic Differentiation, Classification of Igneous Rocks: Textures and Composition, Detrital & Chemical Sedimentary Rocks: Definition & Differences, Base Level of a Stream: Definition & Effect on Erosion, Contact Metamorphism Vs. Pumice is famous for being the rock that can sometimes float. The mineral compositions of igneous rocks are usually described as being felsic, intermediate, mafic, or ultramafic (as examples, see Figure 4.7 and Figure 4.8). Working Scholars® Bringing Tuition-Free College to the Community. Examples of intrusive igneous rocks are diabase, diorite, gabbro, granite, pegmatite, and peridotite. Quiz & Worksheet - What Are Bronchial Tubes? and career path that can help you find the school that's right for you. For example, a coarse-grained, felsic igneous rock is not only a granite, it is an intrusive igneous rock that formed from slow cooling and crystallization of a body of magma within the earth’s crust. In some cases, felsic volcanic rocks may contain phenocrysts of mafic minerals, usually hornblende, pyroxene or a feldspar mineral, and may need to be named after their phenocryst mineral, such as 'hornblende-bearing felsite'. Because the magma is not exposed to the open air or water, it cools slowly and has time to form the kinds of crystals seen in a typical piece of granite. Compare and contrast granite and rhyolite. credit-by-exam regardless of age or education level. Regional Metamorphism: Definition & Differences, Non-silicate Minerals: Chemical Classifications & Examples, Comparing Silicate & Non-silicate Minerals, Volcanic vs Plutonic Igneous Rocks: Definition and Differences, Lithification of Sediments: Definition & Processes, Basaltic Lava: Definition & Characteristics, Optical Properties of Minerals: Luster, Light Transmission, Color & Streak, Geological Faults: Definition, Causes & Types, Silicate Minerals: Chemical Classifications & Examples, Transform Fault: Definition & Characteristics, Unconformities in Geology: Definition & Types, Holt McDougal Modern Chemistry: Online Textbook Help, High School Physical Science: Homework Help Resource, Holt McDougal Physics: Online Textbook Help, High School Biology: Homework Help Resource, DSST Environmental Science: Study Guide & Test Prep, UExcel Microbiology: Study Guide & Test Prep, Prentice Hall Biology: Online Textbook Help, Holt Physical Science: Online Textbook Help, Holt McDougal Modern Biology: Online Textbook Help, AP Environmental Science: Help and Review. Volcanic rocks:Subvolcanic rocks:Plutonic rocks: Igneous rock rich in silica and forming feldspar and quartz, "TECHNICAL REPORT MACKENZIE MOUNTAINS IRON-COPPER PROPERTY, NORTHWEST TERRITORIES, CANADA", https://en.wikipedia.org/w/index.php?title=Felsic&oldid=991274546, Short description is different from Wikidata, Articles with unsourced statements from March 2019, Creative Commons Attribution-ShareAlike License, This page was last edited on 29 November 2020, at 05:46. All rights reserved. An example of a felsic rock is _____ granite _____ rocks are a combination of felsic and mafic rocks. The name 'granite' refers to the grainy quality of the rock. Due to the color of the minerals forming them, the rocks are either light or dark. 's' : ''}}. succeed. Felsic rocks are igneous rocks that are rich in feldspar and silicon. Plus, get practice tests, quizzes, and personalized coaching to help you It may seem strange to think of a solid granite mountain as light weight, but compared to a basalt rock of the same size, it is. just create an account. - Definition & Explanation, What is a Plateau? Read More on This Topic felsic and mafic rocks Mafic rocks are made of _____ & _____ magnesium & Ferric. Mafic minerals are typically dark in color (black, brown, or dark green) and rich in iron and magnesium. In order for a rock to be classified as felsic, it generally needs to contain more than 75% felsic minerals; namely quartz, orthoclase and plagioclase. Graphite is a well-known example of felsic rocks. Igneous rocks are classified according to their mineral content: Ultramafic rocks are dominated by olivine and/or pyroxene. An example of a felsic rock is granite, the light colored rocks that we find in places like the Sierra Nevada mountains in California. Perhaps you meant to contrast felsic rocks with mafic rocks. lessons in math, English, science, history, and more. Select a subject to preview related courses: Pumice is usually a felsic rock, although it's possible for mafic pumice to form. - Location, Facts & History, Yellowstone National Park: Facts, Location & History, General Studies Earth & Space Science: Help & Review, Biological and Biomedical | {{course.flashcardSetCount}} Mafic rock is commonly contrasted with felsic rock, in which light-coloured minerals predominate. NPS photo by Janice Wei. Granite is a great example of Felsic rocks and muscovite, quartz, and some feldspar are the best examples of Felsic minerals. first two years of college and save thousands off your degree. Mafic: Derived from the words magnesium and ferric (Fe is the chemical symbol for iron) to describe an igneous rock having abundant dark-colored, magnesium- or iron-rich minerals such as biotite, pyroxene, or olivine. The word igneous means that the rock became a solid after having originally been hot magma, or lava. Mafic rocks are dominated by plagioclase and pyroxene (even if you can't see them with the naked eye) and smaller amounts of olivine. In order for a rock to be classified as felsic, it generally needs to contain more than 75% felsic minerals; namely quartz, orthoclase and plagioclase. Rocks with greater than 90% felsic minerals can also be called leucocratic, from the Greek words for white and dominance. Obsidian fractures into very sharp-edged pieces, and cultures around the world have taken advantage of this fact to make beautiful cutting tools and weapons. Already registered? Felsic rocks are generally rich in silicon and aluminum and contain only small amounts of magnesium and iron. Log in or sign up to add this lesson to a Custom Course. Igneous Rocks. Geologists don't intend to be confusing by using so many terms, but rather the terms are used for different properties. Which type of volcano would be more likely to erupt explosively? Andesite and diorite likewise refer to extrusive and intrusive intermediate rocks (with dacite and granodiorite applying to those rocks with composition between felsic and intermediate). Common mafic rocks include basalt and its coarse-grained intrusive equivalent, gabbro. Get access risk-free for 30 days, Granite is a felsic rock containing feldspar and quartz along with mica and amphibole, which are also silicate minerals. It erupts from volcanoes and cools too quickly to form large crystals. Igneous rocks are classified according to how and where they formed (in other words, if they’re plutonic or volcanic) and their mineral composition (describing the minerals they contain). If you find a piece of pumice you know that a very violent eruption took place, because this foamy rock only forms under very high heat and pressure conditions. Mafic rocks are made of dark-colored, higher-density minerals such as oliv… For example, a magma that would form rhyolite if it vented at the surface would crystallize into a granite in a subterranean chamber kilometers below the surface. Create an account to start this course today. "Felsic" and "igneous" are overlapping categories: granite and rhyolite are examples of felsic igneous rocks. These rocks are formed from the molten material found beneath the Earth's crust. courses that prepare you to earn Rocks with greater than 90% felsic minerals can also be called leucocratic, meaning 'light-coloured'.Template:Citation needed Felsite is a petrologic field term used to refer to very fine-grained or aphanitic, light-colored volcanicrocks which might be later reclassified after a more detailed microscopic or chemical analysis. a) A very large one that has a very broad gentle slope that looks like a warriors shield from a distance. The rock samples shown in Figure 8.2 are all phaneritic rocks. B. Obsidian is natural volcanic glass. Anyone can earn Obsidian fractures into very sharp-edged pieces, and cultures around the world have taken advantage of this fact to make beautiful cutting tools and weapons. The most common felsic rock is granite. For example, granite contains around 70% of silica. Get the unbiased info you need to find the right school. These varieties include the aforementioned feldspar, which is the name for a group of aluminum silicate minerals containing the light metallic elements potassium, sodium, or calcium; quartz, which is a silicate mineral that comes in a vast array of different forms, from semiprecious gemstones to common sand; and granite, which is a felsic rock containing feldspar and quartz along with mica and amphibole, which are also silicate minerals. Examples of texture are: the size of the mineral grains (crystals), holes or vesicles in the rock, or a mass of mineral grains or a bunch of smaller rocks melted or welded together. Mafic vs Felsic • Mafic and Felsic are categories into which igneous rocks are classified. Feldspar is linked to German. There are examples known of highly sheared granites which can be mistaken for rhyolites. Because there are so many forms that all these minerals can take, there are also many types of granite. In some cases, felsic volcanic rocks may contai… Instead glass forms (example, obsidian). The most common felsic rock is granite. a mafic rock : Granite a felsic rock : 1. Forms high in Bowen's Reaction series: 1. Intermediate rocks are roughly even mixtures of felsic minerals (mainly plagioclase) and mafic minerals (mainly hornblende, pyroxene, and/or biotite ). Because they are made of lighter elements, they tend to be more buoyant than mafic rocks, which are rocks high in magnesium and iron, like basalt. intermediate _____ is an example of an intermediate rock. What are Igneous Rocks? {{courseNav.course.mDynamicIntFields.lessonCount}} lessons a. includes melting and incorporation of inclusions of country rock b. results in additional heating of a magma body c. occurs in all plutons d. separates malfic rock from felsic rock e. includes the inclusion of country rock in an extrusive magma To learn more, visit our Earning Credit Page. Often the species of mafic minerals is included in the name, for instance, hornblende-bearing granite, pyroxene tonalite or augite megacrystic monzonite, because the term "granite" already assumes content with feldspar and quartz. Olivine/pyroxene/Calcic plagioclase rich 4. Unlike mafic rocks, which are rocks high in magnesium and iron (like basalt), felsic rocks come in amazing and unforgettable varieties. An error occurred trying to load this video. Rhyolite is a felsic rock that, like granite, is rich in silicate minerals. Other examples of felsic rocks include rhyolite, which is a felsic rock that, like granite, is rich in silicate minerals and is extrusive (it erupts from volcanoes and cools too quickly to form large crystals); obsidian, which is natural volcanic glass that you can find among rhyolite deposits; and pumice, which is a type of volcanic glass that is a hardened silicate foam, one that had to come from an extremely powerful eruption. Over 83,000 lessons in all major subjects, {{courseNav.course.mDynamicIntFields.lessonCount}}, What is a Continent? - Definition, Examples & Facts, Geography of the Northeastern United States, Informational Listening: Definition & Skills, Quiz & Worksheet - The Boy Who Cried Wolf Plot. Create your account. Test Optional Admissions: Benefiting Schools, Students, or Both? Felsite is a petrologic field term used to refer to very fine-grained or aphanitic, light-colored volcanic rocks which might be later reclassified after a more detailed microscopic or chemical analysis. Felsic magma or lava is higher in viscosity than mafic magma/lava. You'll also take a quiz to test your understanding. The rock texture thus determines the basic name of a felsic rock. Compilations of many rock analyses show that rhyolite and granite are felsic, with an average silica content of about 72 percent; syenite, diorite, and monzonite are intermediate, with an average silica content of 59 percent; gabbro and basalt are mafic, with an average silica content of 48 percent; and peridotite is an ultramafic rock, with an average of 41 percent silica. 4b in Nutman et al., 1984). Rhyolite refers to the volcanic and felsic igneous rocks and granite refer to intrusive and felsic igneous rocks. Gabbro is a mafic rock and has the same chemistry and mineralogy as basalt; diorite is an intermediate rock equivalent to andesite; and granite is a felsic rock equivalent to rhyolite. - Definition, History, Facts & Topics, What is Latitude? Mafic rocks are richer in Mg, Fe, and Ca. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. Although pumice and obsidian look about as different as two rocks can, pumice is also a type of volcanic glass that is a hardened silicate foam. Felsic rocks are igneous rocks that are rich in feldspar and silicon. Intrusive rocks also can be categorized consistent with the shape and size of the intrusive body and its relation t… The explosive volcanic eruptions that produce rhyolite are also sources of obsidian. It is a borrowing of Feldspat. Intrusive Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of a planet, surrounded by way of pre-present rock (called us of a rock); the magma cools slowly and, as a result, these rocks are coarse-grained. study Felsic rocks are made of light-colored, low-density minerals such as quartz and feldspar. Log in here for access. However, this only applies to volcanic rocks. Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form. Granite and rhyolite (shown here) are examples of felsic rocks. Granite is an intrusive, or plutonic, igneous rock, which means that it's formed when magma cools and hardens in spaces within the Earth's crust. What results when carbonic acid reacts with potassium feldspar? 2. Why or why not? Like more familiar kinds of glass, it's high in silica. They have different terminology for describing chemical composition, texture, mineral proportions, and sometimes even location. Like more familiar kinds of glass, it's high in silica. Igneous Rocks Examples. Common felsic minerals include quartz, muscovite, hornblende, orthoclase, and the sodium rich plagioclase feldspars. However, rhyolite is extrusive. 1. It erupts from volcanoes and cools too quickly to form large crystals. In order for a rock to be classified as felsic, it generally needs to contain more than 75% felsic minerals; namely quartz, orthoclase and plagioclase. Services. Felsic rocks are rich in silica, potassium, sodium, and aluminum and contain only small amounts of iron, magnesium, and calcium. Did you know… We have over 220 college - Definition & Explanation, What is a Map Key/Legend? Mafic rocks have between 45 and 55% of silica, whereas felsic rocks have over 65% of silica, the highest of all types. Older, broader usage is now considered archaic. Examples of Archean felsic volcanic rocks occurrence in greenstone belts Felsic volcanic units/localities Age (Ma) Greenstone belt Craton Country/Region Duffer Formation: 3468 ± 2: Warrawoona Eastern Pilbara Craton Australia Marda Tank: 2734 ± 3: Marda Volcanic Complex: Yilgarn Craton Australia Kallehadlu Felsic Volcanics The link is therefore to German Feld, meaning "field".[2]. diorite. Molten lava cooling and forming igneous rock at Hawai'i Volcanoes National Park, Hawai'i. In this lesson, you will read about felsic rocks and find out what they're made of - their name gives clues to their composition. Felsic rocks are richer in K, Na, Al and Si, and, compared to mafic rocks, are … After feldspar, it's the second most important crust mineral. On the opposite side of the rock spectrum are the iron and magnesium rich mafic and ultramafic minerals and rocks. - Definition, Symbols & Examples, What is a Mountain Range? An example of a mafic rock is basalt, the black rock that forms from lava flows in places like Hawaii. However, rhyolite is extrusive. For phaneritic felsic rocks, the QAPF diagram should be used, and a name given according to the granite nomenclature. The explosive volcanic eruptions that produce rhyolite are also sources of obsidian. The word 'feldspar' comes from German words meaning 'field rock.' Main Differences Between Mafic and Felsic The characteristic difference between mafic and felsic is the silica content present in the two rocks. Dark color 2. Mafic rocks are what color? Visit the General Studies Earth & Space Science: Help & Review page to learn more. In geology, felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. - Definition & Explanation, What is Carbon Dating? Obsidianis natural volcanic glass. High specific gravity 3. In Figure 8.2 are examples of igneous rocks that represent the mafic and felsic rock compositions (Figures 8.2A and 8.2C, respectively), as well as an intermediate rock type (Figure 8.2B). The word 'felsic' was made up from parts of those words. - Definition & Overview, What is Geology? Typical felsic rocks are dacite and rhyolite. There are two basic types. Table 1. When it cools and crystallizes into rock, the rock will be described as felsic igneous rock. Fine grained - crystals only seen under high power 5. Common felsic minerals include quartz, muscovite, orthoclase, and the sodium-rich plagioclase feldspars (albite-rich). While non-geologists may look at a rock and just see a rock, geologists are likely thinking of one of the hundreds of descriptive terms they use to describe rocks. How to Do Your Best on Every College Test. Quartz is a silicate mineral that comes in a vast array of different forms, from semiprecious gemstones to common sand. College Student Uses Free Course to Test Out of General Education Requirement, Biology Lesson Plans: Physiology, Mitosis, Metric System Video Lessons, OCL Psychology Student Diary: The Last Test, Online ASE Test Information and Requirements, Master of Business Administration (MBA): Leadership Degree Overview, Best Bachelor's Degrees in Organizational Leadership, Top Ranked Business Administration Degree Program - Milwaukee WI, Web Design Top Rated School Offering Courses in Web Design - Baltimore MD, Networking Degrees Top Rated Computer Networking School - Greensboro NC, Top Rated School with Computer Programming Degree Programs - Greenville SC, FTCE Earth & Space Science 6-12 (008): Test Practice & Study Guide, Environmental Science 101: Environment and Humanity, FTCE Middle Grades General Science 5-9 (004): Test Practice & Study Guide, FTCE Physics 6-12 (032): Test Practice & Study Guide, Introduction to Biology: Certificate Program, Introduction to Astronomy: Certificate Program, Human Anatomy & Physiology: Help and Review, UExcel Pathophysiology: Study Guide & Test Prep, Biosphere & Ocean Absorption of Greenhouse Gases, Explaining & Analyzing Processes of Life in Biology: Practice Problems, Explaining & Analyzing Physical Structures in Biology: Practice Problems, Bacterial Protein Synthesis: Definition, Process & Inhibitors, Quiz & Worksheet - Practical Applications of DNA Technology, Quiz & Worksheet - Ethical and Safety Concerns for DNA Technology, Quiz & Worksheet - Evidence for Evolution in Various Scientific Fields, CPA Subtest IV - Regulation (REG): Study Guide & Practice, CPA Subtest III - Financial Accounting & Reporting (FAR): Study Guide & Practice, ANCC Family Nurse Practitioner: Study Guide & Practice, Top 50 K-12 School Districts for Teachers in Georgia, Finding Good Online Homeschool Programs for the 2020-2021 School Year, Coronavirus Safety Tips for Students Headed Back to School, Parent's Guide for Supporting Stressed Students During the Coronavirus Pandemic, What is Cross-Contamination? Whether you meet them on a climbing expedition or in an archeological dig, or even floating on the ocean, their name tells you that they all have something in common. Try refreshing the page, or contact customer support. © copyright 2003-2020 Study.com. If the rock is analyzed and found to be felsic but is metamorphic and has no definite volcanic protolith, it may be sufficient to simply call it a 'felsic schist'. 6. Quiz & Worksheet - Dr. Heidegger's Experiment by Hawthorne, Quiz & Worksheet - Social Issues in Literature, Flashcards - Real Estate Marketing Basics, Flashcards - Promotional Marketing in Real Estate, HiSET Language Arts - Reading: Prep and Practice, MTEL Adult Basic Education (55): Practice & Study Guide, WEST English Language Arts (301): Practice & Study Guide, Praxis Environmental Education: Ecosystem Interaction & Species Relationships, Quiz & Worksheet - Working with Double Integrals, Quiz & Worksheet - Function & Structure of the Basement Membrane, Quiz & Worksheet - Characteristics of Complementary Goods, Economic Efficiency: Definition & Examples, Joseph Lister: Biography, Facts & Inventions, School Closures in Washington: Plan for WA Students Learning at Home, Learning Activities for Children with Down Syndrome, Tech and Engineering - Questions & Answers, Health and Medicine - Questions & Answers. Although there are complete … Rocks are generally separated into one of three different categories: igneous, sedimentary, and metamorphic. Figure 8.2A is a phaneritic mafic rock called gabbro, Figures 8.2B and 8.3B are a phaneritic intermediate rock called di-orite, and the rock in Figure 8.2C is a phaneritic felsic rock known as granite. The chemical name of a felsic rock is given according to the TAS classification of Le Maitre (1975). Feldspar, one of the key components of felsic rock, which is the name for a group of aluminum silicate minerals containing the light metallic elements potassium, sodium, or calcium. Igneous rocks with 0-15% dark colored minerals (or 0-15% MCI) are the felsic rocks (Figure 4A), igneous rocks with 46-85% MCI are the mafic rocks (Figure 4C), and igneous rocks with over 85% MCI are considered ultramafic (Figure 84D). Do pipettes blow up like balloons when they are heated? You can test out of the They are also darker in color and denser. Granite is the most common felsic rock. This lesson is on mafic, which is on… (See mafic to contrast.) A common mafic rock is basalt. Similarly, a fine-grained, mafic igneous rock is not only a basalt, i… Enrolling in a course lets you earn progress by passing quizzes and exams. Sciences, Culinary Arts and Personal As a group, feldspars form about 60% of Earth's crust. The term "felsic" combines the words "feldspar" and "silica". imaginable degree, area of - Definition, Calculation & Examples, Mid-Atlantic Ridge: Definition & Explanation, Mountain: Definition, Formation, Characteristics & Examples, Phagocytosis: Definition, Process & Types, The Mississippi River: Facts, History & Location, Where Is the Redwood Forest? They contain rare examples of graded layering, defined by variation in the abundance of coarse plagioclase grains (Fig. The mineral grains in such rocks can generally be recognized with the bare eye. To unlock this lesson you must be a Study.com Member. The similarity of the resulting term felsic to the German felsig, "rocky" (from Fels, "rock"), is purely[citation needed] accidental. Image: Basalt, Granite Biotite Hornblende, Rhyolite, Gabbro, and Diorite This may not sound very specific, and in fact there are many different kinds of feldspar. Not sure what college you want to attend yet? Rocks with greater than 90% felsic minerals can also be called leucocratic,[3] from the Greek words for white and dominance. Occurrence of igneous rocks can be either intrusive (plutonic) or extrusive (volcanic). In modern usage, the term acid rock, although sometimes used as a synonym, normally now refers specifically to a high-silica-content (greater than 63% SiO2 by weight) volcanic rock, such as rhyolite.

Dark Chocolate Peanut Butter Brownies, Receptionist Resume Sample Word File, Little Feat Dixie Chicken Song, Mgh Mclean Psychiatry Residency Program, Square Foot Gardening Spacing,

felsic rocks examples

Legg igjen en kommentar

Din e-postadresse vil ikke bli publisert. Obligatoriske felt er merket med *