Obsidian. even among igneous rocks, mafic and felsic are just ranges on a "spectrum" of composition. Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar, biotite, hornblende, and/or pyroxene. This type of stone is usually brown to dark gray in color but Diorite can also be black and bluish-gray and Diorite is often greenish in color. Give a description of diorite "salt and pepper" visible crystals, heavy, dull and course grained. Extrusive Igneous Rocks The chemical composition of diorite is intermediate, between that of mafic gabbro and felsic granite. DIORITE - phaneritic rock (large crystals) of both mafic and felsic minerals. It is contrasted with mafic rocks, which are relatively richer in magnesium and iron.Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. ANDESITE - aphanitic rock (small crystals) of both mafic and felsic minerals. Is diorite felsic or mafic? This diorite is more salt than pepper, but it appears to have less than 10% quartz and no K-feldspar. Igneous Rocks. Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar, biotite, hornblende, and/or pyroxene. Hopefully have provided all the materials you will need for the assignment. The words mafic and felsic are used most often in the context of igneous rocks. Posted on August 31, 2014 by triplejunction. Granite would be a felsic rock type, and basalt would be a mafic rock type. 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 Diorite is usually grey to dark-grey in colour, but it can also be black or bluish-grey, and frequently has a greenish cast. Mafic rocks include basalt, its intrusive equivalent of gabbro, and a variety of less common rock types with higher or lower contents of Na and K. Andesite and its intrusive equivalent, diorite, with slightly higher silica content, are intermediate between mafic and felsic. 5.4.3 Mafic Enclaves and the Trondhjemite-Tonalite-Granodiorite (TTG) Suite. The chemical composition of diorite is intermediate, between that of mafic gabbro and felsic granite. The mixture of mafic and felsic minerals gives the rock a "salt and pepper" appearance. 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. This diorite is closer to the classic balance of mafic and felsic minerals (salt-and-pepper appearance). Question Description This is Geology Unit 8 Igneous Rock 1. sample I1 has what mafic color index (MCI)? Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar, biotite, hornblende, and/or pyroxene. Both felsic and mafic igneous rocks can contain feldspar minerals. Mafic rocks are darker and are composed of magnesium and iron. Its volcanic (fine-grained) analogue is andesite. Felsic igneous rocks are light colored. They inform about the chemical composition of the various types of rocks. Conversely, igneous rocks rich in iron and magnesium-bearing minerals (such as amphibole and pyroxene) are darker and are classified as MAFIC, or basic. 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). I hope it opens up the right the first time. This ne-grained, dark-colored, igneous rock is most likely A. rhyolite B. diorite C. basalt D. gabbro page 2 Felsic … Diorite (red) on the QAPF diagram. 1. determine texture: coarse-grained (visible crystals) = plutonic, fine-grained (microscopic crystals), or porphyritic (visible crystals in fine groundmass) = volcanic. intrusive. Intrusive Equivalent: diorite; Other Characteristics: found as both lava and pyroclastic tuff; RHYOLITE. I also will have the textbook attached. The chemical composition of diorite is intermediate, between that of mafic gabbro and felsic granite. 2. determine color/composition: mostly light minerals = felsic; half light, half black (or gray in fine grained rocks) = intermediate; mostly black minerals = mafic; mostly olivine = ultramafic The chemical composition of diorite is intermediate and between felsic granite and mafic gabbro. Mafic rocks often also contain calcium-rich varieties of plagioclase feldspar. Learn vocabulary, terms, and more with flashcards, games, and other study tools. I need this worksheet completed. Rhyolite is rarely found as lava. No. In geology, felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. Some diorites contain biotite as well as hornblende, and some contain up to 10% quartz. 8.8 sTudenT resPonses Sample I1 has what mafic color index (MCI)? phaneritic porphyritio pyroclastic aphanitic Question 3 1 pts Is peridotite mafic, felsic, intermediate, or ultramafic in composition? A. pumice B. basalt C. granite D. scoria 9. rhyolite felsic or mafic. Mafic Rocks and Rhyolite We have granite, which is intrusive felsic, diorite, which is intrusive intermediate, and andesite, which is extrusive intermediate. 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? Question 1 1 pts Is diorite mafic, felsic, intermediate, or ultramafic in composition? Additionally, they contain somewhat more gas than do the mafic magmas, but not quite as much as the felsic magmas (see below). It is visibly crystalline and usually has a granular texture (composed of roughly equally sized crystals) although the appearance may vary widely. The high silica content and lower temperatures of rhyolite magma result in high viscosities and violent eruptive styles. The term combines the words "feldspar" and "silica." First of all, the terms mafic and felsic generally only apply to igneous rock. enough salt and pepper and you will diorite. Andesite is a type name that applies to igneous rocks having an intermediary composition (sort of a mix of the two, or the transition from mafic to felsic). Unfortunately, I have no super close-up for you. It has 54 questions. Post navigation ← Previous News And Events Posted on December 2, 2020 by Diorite is usually grey to dark-grey in colour, but it can also be black or bluish-grey, and frequently has a greenish cast. Mafic Rock. A link between felsic rocks, the TTG suite, and lode gold Au deposits has been drawn by Burrows et al. mafic. Intermediate magmas are somewhat more viscous than the mafic magmas. Ulrich Kretschmar (Late), Derek McBride, in The Metallogeny of Lode Gold Deposits, 2016. Start studying Igneous Rocks (Mafic or Felsic). Use the scale above to estimate the percentage of mafic minerals in this rock. Is obsidian felsic or mafic? 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. Diorite is a plutonic igneous rock with intermediate composition between mafic and felsic rocks. Is rhyolite felsic or mafic or intermediate? Felsic rocks are light in color and are composed of feldspars and silicates. The photograph below shows an outcrop where a light-colored, igneous rock is cross cut by a dark-colored, igneous rock. It thus qualifies as a diorite. Felsic is a generic term meaning enriched in feldspar and silica (and thus generally lower in iron and magnesium). Rhyme to remember diorite. Felsic, intermediate and mafic igneous rocks differ in their mineral composition. Mafic and Felsic, some igneous basics. 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. mafic 96: - Based on your estimate, describe this rock as felsic, intermediate, mafic, or ultramafic. Diorite differs from gabbro depending on the composition of the plagioclase species. Igneous. Diorite is the name given to intrusive intermediate rocks, whereas andesite is the name given to extrusive intermediate rocks. felsic composition? Felsic minerals are usually light in color and have specific gravities less than 3. intermediate mafic felsic granite, rhyolite) (diorite, andesite) (basalt, gabbro (peridotite, etc.) Common mafic rocks include basalt, diabase and gabbro. Is diorite extrusive or intrusive? 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. Intermediate rocks are composed of the minerals amphibole and feldspar and contain a combination of light and dark minerals. Rhyolite is an extrusive felsic (silicic) volcanic rock. ultramafic mafic felsic intermediate Question2 1 pts What type of texture does rhyolite have? The chemical composition of diorite is intermediate, between that of mafic gabbro and felsic granite. 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 classification based on mineralogy, into mafic and felsic, is accepted as the primary scheme of classification for rocks. Those rich in quartz are classified as FELSIC, or acidic. 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