A mafic mineral or rock is a silicate mineral or igneous rock rich in magnesium and iron. Most mafic minerals are dark in color, and common rock-forming...
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Ultramafic rock (redirect from Ultra-mafic)
high FeO, low potassium, and are composed of usually greater than 90% mafic minerals (dark colored, high magnesium and iron content). The Earth's mantle...
9 KB (1,059 words) - 21:34, 3 January 2024
relatively rich in elements that form feldspar and quartz. It is contrasted with mafic rocks, which are relatively richer in magnesium and iron. Felsic refers...
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volcanics. The hangingwall to the deposit is broadly related to a more mafic sequence of volcanic rocks, either andesite (examples being Whim Creek &...
20 KB (2,537 words) - 22:35, 8 March 2024
Layered intrusion (redirect from Ultramafic to mafic layered intrusions)
ultramafic-mafic intrusive complex consists of ultramafic peridotites and pyroxenites with associated chromitite layers toward the base with more mafic norites...
21 KB (2,455 words) - 01:00, 19 August 2024
feldspar (90–100%), with a minimal mafic component (0–10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present. Anorthosites...
26 KB (3,129 words) - 10:23, 21 June 2024
Gabbro (category Mafic rocks)
Gabbro (/ˈɡæbroʊ/ GAB-roh) is a phaneritic (coarse-grained), mafic intrusive igneous rock formed from the slow cooling of magnesium-rich and iron-rich...
19 KB (2,321 words) - 17:11, 7 July 2024
consists largely of tonalitic and granodioritic gneisses and lesser amounts of mafic and ultramafic gneisses. It underlies and is largely concealed by thin,...
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from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon. More...
69 KB (7,764 words) - 21:21, 8 July 2024
of alkali metals. It is intermediate in composition between low-silica (mafic) gabbro and high-silica (felsic) granite. Diorite is found in mountain-building...
23 KB (2,456 words) - 11:51, 12 August 2024
branches, the continuous (felsic minerals: feldspars) and the discontinuous (mafic minerals). The minerals at the top of the illustration (given aside) are...
5 KB (492 words) - 01:52, 13 July 2022
TTG rocks were directly derived from preexisting mafic materials. The melting temperature of meta-mafic rocks (generally between 700 °C and 1000 °C) depends...
20 KB (2,194 words) - 17:44, 23 March 2024
felsic. Mafic rocks are primarily composed of biotite, hornblende, pyroxene and olivine. Generally, felsic rocks are light colored and mafic rocks are...
48 KB (5,656 words) - 02:36, 23 June 2024
melting of crust rock from the heat of underlying mafic magmas. The lighter felsic magma floats on the mafic magma without significant mixing. Less commonly...
89 KB (9,964 words) - 18:23, 17 August 2024
Lava (section Mafic lava)
into four chemical types based on silica content: felsic, intermediate, mafic, and ultramafic. Felsic or silicic lavas have a silica content greater than...
56 KB (6,577 words) - 18:17, 8 June 2024
formation of a volcanic arc, the Tickalara Oceanic Arc. Sedimentary rocks, mafic volcanic and volcaniclastic rocks deposited in the Central Zone of the Lamboo...
33 KB (3,395 words) - 01:28, 25 March 2024
Fractional crystallization of a mafic parent magma. Partial melting of crustal material. Magma mixing between felsic rhyolitic and mafic basaltic magmas in a magma...
25 KB (2,765 words) - 23:46, 10 May 2024
Magma (section Mafic magmas)
into four chemical types based on silica content: felsic, intermediate, mafic, and ultramafic. Felsic or silicic magmas have a silica content greater...
63 KB (7,678 words) - 15:34, 26 July 2024
together. The spinel petrogenesis in mafic magmatic rocks is strongly debated, but certainly results from mafic magma interaction with more evolved magma...
16 KB (1,537 words) - 13:47, 16 June 2024
crystal mush.: 8 Two distinct mafic magmas were involved in the eruption, and a total volume of 3–5 km3 (0.72–1.20 cu mi) of mafic magma is atypically high...
27 KB (2,688 words) - 13:31, 19 July 2024
Tuff (section Mafic volcanism)
resemblance to the modern ash beds of Cotopaxi, Krakatoa, and Mont Pelé. Mafic volcanism typically takes the form of Hawaiian eruptions that are nonexplosive...
42 KB (4,848 words) - 06:48, 10 July 2024
fluid-mobile elements in the mantle, and the provision of evidence that oxidized mafic magmas bring base metals and sulfur from the mantle to form giant copper...
26 KB (2,940 words) - 08:53, 15 January 2024
feldspar granite – Type of igneous rock rich in alkali feldspar Anorthosite – Mafic intrusive igneous rock composed predominantly of plagioclase Aplite – Fine-grained...
14 KB (2,187 words) - 23:33, 16 April 2024
the few gemstones that occur in only one color. Peridot can be found in mafic and ultramafic rocks occurring in lava and peridotite xenoliths of the mantle...
17 KB (1,667 words) - 19:58, 18 August 2024
massive sulfides. The Blake River Megacaldera Complex consists of mainly mafic to intermediate volcanic flows and less abundant felsic volcanic flows and...
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Southern Oklahoma Aulacogen (section Mafic rocks)
occurred simultaneously, with two definite episodes of magma activity, mafic and felsic, the former of which being chiefly composed of gabbro-heavy magma...
20 KB (2,435 words) - 00:27, 4 April 2023
Group consists predominantly of mafic volcanic and calcareous rocks. The Alwar Group mainly consists of arenaceous and mafic volcanic rocks. The Ajabgarh...
19 KB (2,358 words) - 21:44, 5 May 2024
"Petrological constraints on the recycling of mafic crystal mushes and intrusion of braided sills in the Torres del Paine Mafic Complex (Patagonia)" (PDF). Journal...
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Brook Formation. Locally abundant rocks include tholeiitic to transitional mafic fragmental rocks and massive flows, as well as felsic tuffs, tholeiitic...
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between 3.7 and 3.8 billion years. The belt contains variably metamorphosed mafic volcanic and sedimentary rocks, and is the largest exposure of Eoarchaean...
36 KB (4,094 words) - 10:48, 29 November 2023