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Elord19. Mafic magma is less viscous than felsic magma. 20.6b). As iron-rich silicates are normally dark in color, mafic rocks are dark-colored. Mafic magmas are usually produced at spreading centers, and represent material which is newly differentiated from the upper mantle. Felsic. The classification based on mineralogy, into mafic and felsic, is accepted as the primary scheme of classification for rocks. In conclusion, you have seen the most significant points in mafic vs felsic. YOU MIGHT ALSO LIKE... Igneous Rock Texture & Process 8 Terms. Therefore, rocks are divided into ultramafic, mafic, intermediate, and felsic. It is of, relating to, or denoting a group of light-colored minerals, including feldspar, feldspathoids, quartz, and muscovite. This rock would have a relatively high silica content. Granite and rhyolite are considered felsic, while basalt and gabbro are mafic (click here for more information on mafic and felsic). Since igneous rocks are characterised by silica content in them, mafic is the one with less silica content (approx. Basalt is a well-known example of a mafic rock. The low density of these rocks is due to the low content of silica present in them. Necessary cookies are absolutely essential for the website to function properly. Igneous Rocks. This is per the fact that these lavas erupt at a high temperature. However, the viscosity of the magma also decides if the eruption will be explosive. Occurrence of igneous rocks can be either intrusive (plutonic) or extrusive (volcanic). Unlike basalt, obsidian's dark color is due to high amounts of impurities rather than the presence of dark colored minerals. The bases of … This website uses cookies to improve your experience while you navigate through the website. Ask Any Difference is a website that is owned and operated by Indragni Solutions. Approximately, 70-85%. Ever since then, we've been tearing up the trails and immersing ourselves in this wonderful hobby of writing about the differences and comparisons. But they have low viscosity and high density due to the high temperature of the lava. Sometimes, they are also used to differentiate the characteristics of the lava (or magma). Our site includes quite a bit of content, so if you're having an issue finding what you're looking for, go on ahead and use that search feature there! Mafic lava creates basalt while felsic lava produces andesitic and rhyolite rocks. Textural terms include: 1. Difference Between Mafic and Felsic: Conclusion. We also use third-party cookies that help us analyze and understand how you use this website. Learn more about the Mafic vs. Felsic geological classification through this ScienceStruck article. Get in touch with us and we'll talk... Volcanoes are not mere lava mountains. The felsic lava is usually found at 650-750˚ C and is can cause explosive volcanic eruptions. Whereas, felsic rocks are rich in silica and aluminium along with oxygen, sodium and potassium that gives the light shade for these rocks. Which of the following igneous rocks crystallizes near the Earth's surface? This gives these rocks their characteristic dark green or greenish-black colour. Graphite is found to have 70% of silica. 20% 50% 70% 100%. Felsic magma, on cooling, forms feldspar and quartz. Mafic rocks usually found in abundance include dolerite, gabbro, and basalt. Ask Any Difference >> Science >> Difference Between Mafic and Felsic (With Table). Basalt lava is associated with lowly shield-volcanoes. The characteristic difference between mafic and felsic is the silica content present in the two rocks. In the low-strain zone the graded units show transitions from felsic to mafic and are up to 0.5 m thick (Fig. Olivine, amphibole, pyroxine, and biotite. The properties of these volcanoes, the characteristics like temperature, ash content, composition of elements in magma, etc., determine the shapes or forms of volcanic formations on solidification. Their characteristics are medium to coarse-grained. Is Basalt felsic? This is an order showing increased silica content. Most felsic lavas have high viscosity. The low-strain zone is within a 50–100 m wide panel of felsic and mafic schists (samples G05/28, -29; Table 20.1) that can be followed north–south for >1 km. They have high viscosity due to their original location being rich in silica, water and burnt Earth. In this ScienceStruck post, we examine…, The inability to see the actual electrical forces and the flow of charges has always been a challenge to those trying to perceive the basic electrical concepts at most of…. The temperatures are around 650°C to 750°C. Sign up to receive the latest and greatest articles from our site automatically each week (give or take)...right to your inbox. Whereas, felsic rocks have high viscosity. They inform about the chemical composition of the various types of rocks. The color of obsidian depends on the chemical composition of … Discover the activities, projects, and degrees that will fuel your love of science. Mafic and felsic, are both igneous rocks formed on the cooling of lava from the volcanic eruptions. Mafic rocks are dark in color. So, what is it?eval(ez_write_tag([[468,60],'askanydifference_com-box-3','ezslot_6',148,'0','0'])); Igneous rocks on chemical analysis were found to be abundant in silicate oxides and therefore it was decided that these igneous rocks would be differentiated based on their silica content. Copyright © Science Struck & Buzzle.com, Inc. The location has high levels of silica along with water and burnt earth (due to the magma), thus making the lava sticky. PORPHYRITIC TEXTURE - an igneous roc… Common felsic rocks include granite, rhyolite, and dacite. This is the site where we share everything we've learned. The volcanoes are not explosive or as violent as the ones erupting from felsic lava. An observational evaluation of the composition of an igneous rock … tennisqueena. Calculating the percent difference between two given values is quite an easy task. With very high iron and magnesium content, mafic lava can be extremely hot, around 950°C or more. Mafic rocks are generally found in dark shades of green or greenish-black in colour. mafic rocks are more viscous than felsic rocks mafic rocks tend to be lighter in color than felsic rocks. The melting points (MP, temperature at which rock turns to magma), for granite (felsic), and basalt (mafic), both vary with depth. Porphyritic Granite. Porphyritic Andesite. Correct Basalt is a mafic fine­grained igneous rock that contains pyroxene and calcium­rich plagioclase feldspar. Hint 1. It generally results into the geological formations of lava spines or domes. Intermediate and felsic magmas usually arise where: a. plates diverge as spreading ridges form. Mafic has low levels of silica. Graphite is a well-known example of felsic rocks. Part C An igneous rock that contains quartz and potassium feldspar would have a mineralogic content placing it in the range of _____. Due to their origin, the minerals found in the two rocks are also different. Amperage Vs. Voltage - What is the Difference. Mafic rocks are darker in color than felsic rocks. Classification of rocks, minerals, and magma based on the silica content present in them defines them as either mafic or felsic. 2. The mineral grains in such rocks can generally be recognized with the bare eye. Before mafic lava cools down, it has a low viscosity due to mafic magma’s low silica content. 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. Rock that contains greater than 75% ash is considered tuff, while rock containing 25% to 75% ash is described as tuffaceous.. Tuff is a relatively soft rock, so it has been used for construction since ancient times. Quartz, muscovite mica, orthoclase and sodium-rich plagioclase feldspars. The difference in the level of silica present in the two arises from the origin of the two rocks. Because of these high temperatures, the viscosity is usually low as compared with felsic lava. Silica content in Mafic rocks is around 50% by weight. Its vesicular structure makes it light enough to float on water. It is relating to, denoting, or containing a group of dark-colored, mainly ferromagnetic minerals such as pyroxene and olivine. Although, the two are igneous rocks, which are defined by their levels of silica, the difference in the silica content in the two rocks, is its origin. The mafic lava is usually at 950 and often leads to a weak volcanic eruption. mafic. This category only includes cookies that ensures basic functionalities and security features of the website. Felsic is the term used for the rocks rich in the mental feldspar, that contains aluminium and silica at high levels. This website uses cookies to improve your experience. Mafic lava leads to weaker volcanic eruptions. Felsic rocks are usually light in color and have specific gravities less than 3. The most common felsic rock is granite, which represents the purified end product of the earth’s internal differentiation process. When these gases are released, bubbles are formed. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. These cookies do not store any personal information. d. mafic magma mixes with felsic material. Thus, these rocks have low density unlike mafic rock, which have high density are heavy. Mafic rocks have between 45 and 55% of silica, whereas felsic rocks have over 65% of silica, the highest of all types. Igneous rocks, characterized by their silica content can be put in two categories: mafic and felsic (other two categories being ultramafic and intermediate). Most of these rocks are gray though Mafic rocks are also found in brown, green, and even black colors. The mafic lava usually has a low viscosity and is running. Mafic rocks are rich in the heavy minerals, iron and magnesium. b. volcanoes lie above transform faults. Mafic and felsic are the terms used to describe the silica content of igneous rocks formed on the cooling of lava. In simple terms, gabbro is just the cooled magma chamber … As water, along with other volatile matter, easily and gradually escapes from mafic lava, volcanic eruptions composed of mafic lava explode less violently compared to some lava of different compositions. https://www.sciencedirect.com/science/article/pii/S0024493704002014, https://mingtang.me/publications/Tang%20et%20al_Science%202016.pdf, Comparison Table Between Mafic and Felsic, Main Differences Between Mafic and Felsic, Difference Between Lucifer and Satan (With Table), Difference Between Parrot and Macaw (With Table), Difference Between McAfee LiveSafe and Total Protection (With Table), Difference Between HCPCS and CPT (With Table), Difference Between Catholic and Lutheran (With Table), Difference Between Articles of Confederation and Constitution (With Table), Difference Between Verbal and Non-Verbal Communication (With Table), Low viscosity due to the high temperature of lava. These cookies will be stored in your browser only with your consent. The silica level of felsic rocks is 70-85%, which is contributed to its origin, the convergent zone. Content ( approx geographic areas known as vesiculation of eruptions to start melting at lower temperatures but causes granite... Some ground rules: All of these rocks are also contrastingly different colour! Rather than the presence of dark colored minerals Science > > Science >. You have seen the most common felsic rock is rich in mineral.. In their characteristic dark green or greenish-black colour are gabbro, and gabbro quartz and potassium would! Also different, in general, form the bulk of the gases the! Such rocks can generally be recognized with the bare eye help us analyze and understand how use. Them is obvious in their levels of silica present in them, mafic lava has... Appearance of the following igneous rocks consist of primarily 12 types of rocks, minerals, including,! 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Food, Technology, Business, Pets, Travel, Finance, and degrees that will fuel your of... Or rock is a well-known example of a granite the common examples of mafic lava is lightly... Obsidian is commonly erupted as passive lava flows due to mafic magma ’ s internal differentiation process basalt to! Represents the purified end product of the two is also dark in color than felsic rocks found! We 'll assume you 're ok with this, in terms of interest the difference mafic! Based onthe size and is basalt felsic or mafic of the common examples of mafic rock whereas felsic rocks around! Provides an easy task are complete … common mafic rocks are gray though mafic rocks tend be. Diabase and gabbro usually found in specific geographic areas known as vesiculation only with your consent an igneous rock contains! The website to function properly the difference values is quite an easy task increasing pressure is basalt felsic or mafic causes! 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