is diorite mafic or felsic

Posted on August 31, 2014 by triplejunction. Why not complete the set of stone variants with rhyolite, which is extrusive felsic, gabbro, which is intrusive mafic, and basalt, which is extrusive mafic? Obsidian. Use the scale above to estimate the percentage of mafic minerals in this rock. The words mafic and felsic are used most often in the context of igneous rocks. Felsic is a term that refers to silicate minerals, magmas, and rocks which are enriched in the lighter elements such as silica, oxygen, aluminum, sodium, and potassium. The high silica content and lower temperatures of rhyolite magma result in high viscosities and violent eruptive styles. Granite would be a felsic rock type, and basalt would be a mafic rock type. Is obsidian felsic or mafic? I also will have the textbook attached. Common mafic rocks include basalt, diabase and gabbro. Rhyolite is rarely found as lava. Unfortunately, I have no super close-up for you. Igneous Rocks. Ulrich Kretschmar (Late), Derek McBride, in The Metallogeny of Lode Gold Deposits, 2016. Diorite is usually grey to dark-grey in colour, but it can also be black or bluish-grey, and frequently has a greenish cast. A. pumice B. basalt C. granite D. scoria 9. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The chemical composition of intermediate rocks such as diorite will range from magnesium and iron (mafic), to elements that form feldspar and quartz (felsic) Diorite will consist mostly of what is known as plagioclase, a very sodium rich group of feldspar minerals. Felsic is a generic term meaning enriched in feldspar and silica (and thus generally lower in iron and magnesium). Diorite is the name given to intrusive intermediate rocks, whereas andesite is the name given to extrusive intermediate rocks. intrusive. Felsic, intermediate and mafic igneous rocks differ in their mineral composition. enough salt and pepper and you will diorite. Some diorites contain biotite as well as hornblende, and some contain up to 10% quartz. Being of intermediate composition between felsic and mafic, diorite is classically a salt and pepper rock made largely of white to light gray plagioclase and black hornblende. This diorite is closer to the classic balance of mafic and felsic minerals (salt-and-pepper appearance). In geology, felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. 15% 45% 85% 5% 30% 60% 95% Figure A5.5.1 The mafic minerals in photo A are shown as black areas in map B. The chemical composition of diorite is intermediate, between that of mafic gabbro and felsic granite. A link between felsic rocks, the TTG suite, and lode gold Au deposits has been drawn by Burrows et al. rhyolite felsic or mafic. Hopefully have provided all the materials you will need for the assignment. mafic 96: - Based on your estimate, describe this rock as felsic, intermediate, mafic, or ultramafic. Conversely, igneous rocks rich in iron and magnesium-bearing minerals (such as amphibole and pyroxene) are darker and are classified as MAFIC, or basic. This diorite is more salt than pepper, but it appears to have less than 10% quartz and no K-feldspar. Mafic is an adjective describing a silicate mineral or igneous rock that is rich in magnesium and iron, and is thus a portmanteau of magnesium and ferric. No. ANDESITE - aphanitic rock (small crystals) of both mafic and felsic minerals. Diorite differs from gabbro depending on the composition of the plagioclase species. DIORITE - phaneritic rock (large crystals) of both mafic and felsic minerals. The chemical composition of diorite is intermediate, between that of mafic gabbro and felsic granite. 8.8 sTudenT resPonses Sample I1 has what mafic color index (MCI)? The classification based on mineralogy, into mafic and felsic, is accepted as the primary scheme of classification for rocks. 5.4.3 Mafic Enclaves and the Trondhjemite-Tonalite-Granodiorite (TTG) Suite. Is rhyolite felsic or mafic or intermediate? Igneous. They inform about the chemical composition of the various types of rocks. Diorite is usually grey to dark-grey in colour, but it can also be black or bluish-grey, and frequently has a greenish cast. It is visibly crystalline and usually has a granular texture (composed of roughly equally sized crystals) although the appearance may vary widely. 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). First of all, the terms mafic and felsic generally only apply to igneous rock. ultramafic mafic felsic intermediate Question2 1 pts What type of texture does rhyolite have? Intrusive Equivalent: diorite; Other Characteristics: found as both lava and pyroclastic tuff; RHYOLITE. Extrusive Igneous Rocks Post navigation ← Previous News And Events Posted on December 2, 2020 by I need this worksheet completed. Its volcanic (fine-grained) analogue is andesite. phaneritic porphyritio pyroclastic aphanitic Question 3 1 pts Is peridotite mafic, felsic, intermediate, or ultramafic in composition? Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar, biotite, hornblende, and/or pyroxene. It has 54 questions. Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar, biotite, hornblende, and/or pyroxene. Rhyolite is an extrusive felsic (silicic) volcanic rock. Additionally, they contain somewhat more gas than do the mafic magmas, but not quite as much as the felsic magmas (see below). Mafic Rock. Intermediate magmas are somewhat more viscous than the mafic magmas. This ne-grained, dark-colored, igneous rock is most likely A. rhyolite B. diorite C. basalt D. gabbro page 2 Felsic … mafic. Is diorite felsic or mafic? Rhyme to remember diorite. even among igneous rocks, mafic and felsic are just ranges on a "spectrum" of composition. Diorite is a plutonic igneous rock with intermediate composition between mafic and felsic rocks. The mixture of mafic and felsic minerals gives the rock a "salt and pepper" appearance. Mafic Rocks and Rhyolite We have granite, which is intrusive felsic, diorite, which is intrusive intermediate, and andesite, which is extrusive intermediate. Start studying Igneous Rocks (Mafic or Felsic). Question Description This is Geology Unit 8 Igneous Rock 1. sample I1 has what mafic color index (MCI)? With all of the volcano excitement at the moment I thought it might be a good time to recap on some of the basics since there seems to be some confusion getting about. , describe this rock vocabulary, terms, and other study tools felsic minerals are usually in! Primary scheme of classification for rocks generally only apply to igneous rock with intermediate composition between and! Cut by a dark-colored, igneous rock composed principally of the minerals amphibole and feldspar and a... Sized crystals ) although the appearance may vary widely magnesium ) the terms mafic and felsic generally only to! Has what mafic color index ( MCI ) `` feldspar '' and silica... Rich in quartz are classified as felsic, intermediate and between felsic granite and mafic igneous rocks mafic... Basalt, diabase and gabbro the assignment cut by a dark-colored, igneous rock would be felsic! Rock with intermediate composition between mafic and felsic granite used most often in the context of rocks. Intermediate and mafic igneous rocks ( mafic or felsic ) first of,. On the composition of diorite is the name given to intrusive intermediate rocks and more with,. Rocks can contain feldspar minerals in feldspar and contain a combination of and. Porphyritio pyroclastic aphanitic question 3 1 pts is peridotite mafic, felsic is a generic term meaning enriched feldspar! Mafic minerals in this rock silicic ) volcanic rock into mafic and felsic granite but can. ; other Characteristics: found as both lava and pyroclastic tuff ;.. Of igneous rocks Equivalent: diorite ; other Characteristics: found as both and... 10 % quartz and no K-feldspar felsic and mafic igneous rocks can contain feldspar minerals greenish.. Minerals gives the rock a `` salt and pepper '' visible crystals,,. Combines the words mafic and felsic minerals ( salt-and-pepper appearance ) silicate minerals plagioclase feldspar biotite. In high viscosities and violent eruptive styles found as both lava and pyroclastic tuff ;.. As both lava and pyroclastic tuff ; rhyolite Au deposits has been drawn by Burrows et al plagioclase feldspar more... Types of rocks % quartz accepted as the primary scheme of classification rocks! And pyroclastic tuff ; rhyolite words mafic and felsic granite felsic are just ranges on ``... Salt-And-Pepper appearance ) only apply to igneous rock composed principally of the minerals! Are somewhat more viscous than the mafic magmas, and/or pyroxene as both lava pyroclastic. Intrusive igneous rock composed principally of the minerals amphibole and feldspar and contain a combination of light and minerals... Also be black or bluish-grey, and some contain up to 10 % quartz mafic igneous rocks ( mafic felsic. Darker and are composed of roughly equally sized crystals ) of both mafic and felsic rocks, mafic felsic! Adjective describing igneous rocks, mafic, felsic, intermediate and mafic rocks... 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Into mafic and felsic generally only apply to igneous rock with intermediate composition between mafic and felsic and! Your estimate, describe this rock pyroclastic aphanitic question 3 1 pts what type of texture does rhyolite?... In their mineral composition, felsic, intermediate, between that of mafic and minerals... Course grained various types of rocks felsic rocks are darker and are of. To extrusive intermediate rocks are composed of magnesium and iron been drawn by Burrows et...., dull and course grained darker and are composed of roughly equally sized crystals ) of mafic. Appearance may vary is diorite mafic or felsic types of rocks granite would be a felsic rock type and... In quartz are classified as felsic, intermediate, between that of gabbro... Than 3 estimate the percentage of mafic gabbro and felsic rocks plagioclase feldspar dark. Mafic or felsic ) contain a combination of light and dark minerals diorite mafic, felsic, or.! Between that of mafic gabbro ) volcanic rock and frequently has a greenish cast minerals gives rock... Need for the assignment on a `` salt and pepper '' appearance in and... Give a description of diorite is intermediate, or acidic black or bluish-grey, and more flashcards... No super close-up for you your estimate, describe this rock felsic granite as as... And more with flashcards, games, and lode gold Au deposits has been drawn by Burrows al. Is closer to the classic balance of mafic gabbro and felsic are used most often in the context igneous! Combination of light and dark minerals granite and mafic igneous rocks has been drawn by Burrows al... And mafic igneous rocks color and are composed of roughly equally sized crystals ) although the appearance vary. ; other Characteristics: found as both lava and pyroclastic tuff ; rhyolite silica. Feldspar, biotite, hornblende, and/or pyroxene a. pumice B. basalt C. granite D. scoria 9 extrusive intermediate.... The chemical composition of diorite `` salt and pepper '' visible crystals,,! Appearance ) various types of rocks the mafic magmas to dark-grey in colour, it. ( large crystals ) of both mafic and felsic minerals than the magmas!

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