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Igneous rock rich in silica and feldspar
In geology, felsic is a modifier describing igneous rocks that are relatively rich in elements that form feldspar and quartz. It is contrasted with mafic
Felsic
Molten rock expelled by a volcano during an eruption
into four chemical types based on silica content: felsic, intermediate, mafic, and ultramafic. Felsic or silicic lavas have a silica content greater than
Lava
Ratio of dark- to light-colored minerals in a rock
of the ratio between generally dark mafic minerals and generally light felsic minerals in an igneous rock. The color index of an igneous rock is the volume
Color_index_(geology)
Geological formation
consists of subvolcanic intrusions of a partly preserved volcanic vent and felsic volcanic rocks that were erupted from the vent. The eastern portion of The
The_Devastator_Assemblage
Metamorphic rock unit in Canada
The Acasta Gneiss Complex, also called the Acasta Gneiss, is a body of felsic to ultramafic Archean basement rocks, gneisses, that form the northwestern
Acasta_Gneiss
Rock formed through the cooling and solidification of magma or lava
viscosity similar to thick, cold molasses or even rubber when erupted. Felsic magma, such as rhyolite, is usually erupted at low temperature and is up
Igneous_rock
Felsic volcanic rocks formed in the Archean Eon
Archean felsic volcanic rocks are felsic volcanic rocks that were formed in the Archean Eon (4 to 2.5 billion years ago). The term "felsic" means that
Archean_felsic_volcanic_rocks
Metal sulfide ore deposit
unconsolidated sediments. The typical location for VMS deposits is at the top of the felsic volcanic sequence, within a sequence of volcaniclastic tuffaceous epiclastics
Volcanogenic massive sulfide ore deposit
Volcanogenic_massive_sulfide_ore_deposit
Type of conical volcano composed of layers of lava and tephra
spreading far, due to high viscosity. The magma forming this lava is often felsic, having high to intermediate levels of silica (as in rhyolite, dacite, or
Stratovolcano
oceanic crust, while continental crust consists principally of lower-density felsic granitic rocks. Geologists generally agree that the following tectonic plates
List_of_tectonic_plates
Type of rock texture
especially of the felsic type such as felsites and rhyolites, may have a cryptocrystalline groundmass as distinguished from pure obsidian (felsic) or tachylyte
Cryptocrystalline
Intrusive igneous rock
syenites contain larger proportions of mafic components and smaller amounts of felsic material than most granites; those are classed as being of intermediate
Syenite
Igneous, volcanic rock, of felsic (silica-rich) composition
Eruptions of rhyolite lava are relatively rare compared to eruptions of less felsic lavas. Only four eruptions of rhyolite have been recorded since the start
Rhyolite
Hot semifluid material found beneath the surface of Earth
into four chemical types based on silica content: felsic, intermediate, mafic, and ultramafic. Felsic or silicic magmas have a silica content greater than
Magma
Naturally occurring volcanic glass
rapidly with minimal crystal growth. It is an igneous rock. Produced from felsic lava, obsidian is rich in the lighter elements such as silicon, oxygen,
Obsidian
Geological formation in Northern New Brunswick, Canada
fragmental rocks and massive flows, as well as felsic tuffs, tholeiitic pillow basalts and minor porphyritic felsic flows. Siltstone, greywacke, iron formation
Flat_Landing_Brook_Formation
Science that applies chemistry to analyze geological systems
siliceous igneous rocks containing greater than 66% of silica, known as felsic rocks, quartz is not abundant in igneous rocks. In basic rocks (containing
Geochemistry
Rupture in a planet's crust where material escapes
contains a high percentage (>63%) of silica, the lava is described as felsic. Felsic lavas (dacites or rhyolites) are highly viscous and are erupted as domes
Volcano
Common high-grade metamorphic rock
containing more magnesium and iron). The lighter bands contain relatively more felsic minerals (minerals such as feldspar or quartz, which contain more of the
Gneiss
Volcanic rock
pyroclastic igneous rock. It is commonly but not exclusively of silicic or felsic to intermediate in composition (e.g., rhyolitic, dacitic, andesite, pantellerite
Pumice
Volcanic rock intermediate in composition between andesite and rhyolite
magma is formed by the subduction of young oceanic crust under a thick felsic continental plate. Oceanic crust is hydrothermally altered causing addition
Dacite
metal oxides – A felsic volcanic rock which is intermediate between a rhyolite and a dacite Rhyolite – Igneous, volcanic rock, of felsic (silica-rich) composition
List_of_rock_types
created, very rarely, by advanced carbon dioxide alteration (carbonation) of felsic and mafic rocks. It is characterised by the presence of alkali feldspar
Fenite
Order of crystallization of minerals in magma
material had formed. The series is divided into two branches, the continuous (felsic minerals: feldspars) and the discontinuous (mafic minerals). The minerals
Bowen's_reaction_series
Geologic formation in Northeastern Ontario, Canada
supracrustal rocks in Eastern Ontario, as well as some of the most ancient felsic magmatic events in this section of the Superior craton. Uranium-lead dating
Temagami_Greenstone_Belt
Silicate mineral or igneous rock that is rich in magnesium and iron
iron, magnesium, and calcium and typically dark in color. In contrast, the felsic rocks are typically light in color and enriched in aluminium and silicon
Mafic
Third planet from the Sun
been mafic in composition. The first continental crust, which was more felsic in composition, formed by the partial melting of this mafic crust. Hadean-aged
Earth
Ancient granite-greenstone terrane in South Africa
trondhjemitic suite of silicified felsic intrusive and flow banded rocks, and sedimentary chert beds. Veins of felsic, chert and ultramafic material intrude
Barberton_Greenstone_Belt
Layer of rock that forms the continents and continental shelves
Conrad discontinuity), there is a reasonably sharp contrast between the more felsic upper continental crust and the lower continental crust, which is more mafic
Continental_crust
Igneous rock
Tonalite is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic (coarse-grained) texture. Feldspar is present as plagioclase
Tonalite
Volcano that has erupted with a volcanic explosivity index of 8
Central Andes, Chile: Compositional Variation of Two Cogenetic, Large-Volume Felsic Ignimbrites". Journal of Petrology. 42 (3): 459–486. Bibcode:2001JPet..
Supervolcano
Region in East Asia
a volcanic island in the Sea of Japan, the composition of which is more felsic than Jeju. The volcanic islands tend to be younger, the more westward. Because
Korea
refers to such situations in plutonic rocks. Micro-granular enclaves in felsic plutons result from the introduction of mafic magma into the magma chamber
Enclave_(geology)
Failed rift of tectonic plates in the southern US
simultaneously, with two definite episodes of magma activity, mafic and felsic, the former of which being chiefly composed of gabbro-heavy magma and the
Southern_Oklahoma_Aulacogen
Eruption of both mafic and felsic lavas from a single volcanic centre
Bimodal volcanism is the eruption of both mafic and felsic lavas from a single volcanic centre with little or no lavas of intermediate composition. This
Bimodal_volcanism
Large igneous rock intrusion
deep in the Earth's crust. Batholiths are almost always made mostly of felsic or intermediate rock types, such as granite, quartz monzonite, or diorite
Batholith
Igneous rock type
intermediate in composition between low-silica (mafic) gabbro and high-silica (felsic) granite. Diorite is found in mountain-building belts (orogens) on the margins
Diorite
Radiometric dating method useful for determining the ages of rocks and meteorites
partitioning during sedimentation and diagenesis. Fractional crystallisation of felsic minerals changes the Sm/Nd ratio of the resultant materials. This, in turn
Samarium–neodymium_dating
Geological formations in North America
trace element geochemistry of the bentonite shows that its source was a felsic calc-alkalic magmatic source, which is characteristic of volcanism from
Deicke and Millbrig bentonite layers
Deicke_and_Millbrig_bentonite_layers
Hydrous potassium iron titanium silicate mineral
Its great submetallic gleam and darkness contrast sharply with the light (felsic) matrix the mineral is regularly found within. Astrophyllite is usually
Astrophyllite
Type of igneous rock rich in alkali feldspar
feldspar granite, some varieties of which are called 'red granite', is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar
Alkali_feldspar_granite
Type of igneous rock
pegmatite masses occur with granite. Granite forms from silica-rich (felsic) magmas. Felsic magmas are thought to form by addition of heat or water vapor to
Granite
Part of the Indian Shield in south India
volcanic eruptions caused by accretions led to the formation of Archean felsic continent crust. For finding when the Archean crust accretions happened
Dharwar_Craton
Relatively flat submarine region that rises well above the level of the ambient seabed
7–4.3 mi)) mafic or ultra-mafic crust and are therefore uncontaminated by felsic crust and representative for their mantle sources. These plateaus often
Oceanic_plateau
Rock consolidated from volcanic ash
Guadalupe Formation in Luzon, Philippines Composition Classification Mafic to felsic Primary Volcanic ash Secondary Quartz, feldspars (sanidine, anorthoclase
Tuff
Rocks rich in aluminium silicate minerals
sial is 2.7 g/cm3. Geologists often refer to the rocks in this layer as felsic, because they contain high levels of feldspar, an aluminium silicate mineral
Sial
Sodium endmember of the plagioclase feldspar series
white, hence its name from Latin, albus. It is a common constituent in felsic rocks. Albite crystallizes with triclinic pinacoidal forms. Its specific
Albite
Canada. It has a diameter of 60 km (37 mi) and is composed mainly of Eocene felsic and mafic volcanic rocks. Rocks within the caldera range in composition
Clisbako_Caldera_Complex
Earth's outer shell of rock
25–70 km (about 15–44 mi) thick and mostly composed of less dense, more felsic rocks, such as granite. In a few places, such as the Tibetan Plateau, the
Earth's_crust
Fine-grained intrusive igneous rock type similar to granite
They are associated with the later stages of many larger intermediate to felsic intrusions. Aplites have a global distribution and have been described from
Aplite
(modal) composition is more often used (dividing the igneous rocks into felsic/leucocratic, mafic/melanocratic and ultramafic). The term "silicic", widely
Acidic_rock
Lithostratigraphic unit in the Grand Canyon, Arizona
relict structures and textures, the Brahma Schist is composed of mafic to felsic-composition metavolcanic rocks. The Rama Schist consists of massive, fine-grained
Vishnu_Basement_Rocks
Type of igneous rock
composition refers to a rock whose chemical composition is intermediate between felsic and mafic compositions, typically containing about 52–63 wt% SiO2. It is
Intermediate_composition
Geologic eon, 4567–4031 million years ago
Chen, K; Rudnick, RL (2016). "Archean upper crust transition from mafic to felsic marks the onset of plate tectonics". Science. 351 (6271): 372–375. Bibcode:2016Sci
Hadean
Geologic Feature
deposits form in hydrothermal fluid circulation systems developed around felsic to intermediate magma chambers and/or cooling plutons. However, they did
Hydrothermal_mineral_deposit
Type of igneous rock
Quartz monzonite is an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. It is typically
Quartz_monzonite
Explosive eruptions usually involve thick, highly viscous, silicic or felsic magma, high in volatiles like water vapor and carbon dioxide. Pyroclastic
List of largest volcanic eruptions
List_of_largest_volcanic_eruptions
Felsic volcanic rock
lithophysa (plural lithophysae, from Greek lithos "stone" + phusa "bubble") is a felsic volcanic rock with a spherulitic structure and interior cavity with concentric
Lithophysa
Active lava dome in Iojima, Kagoshima, Japan
the borders of the town of Mishima. The mountain is made up of non-alkali felsic rock and pyroclasitic flows. Geographical Survey Institute map 25000:1 薩摩硫黄島
Mount_Iō_(Iōjima)
Mountain range in British Columbia, Canada
shield volcanoes. It is mainly composed of 70 to 150 m (230 to 490 ft) thick felsic lava flows that were erupted from a central vent. These are overlain by
Itcha_Range
Mine in North Carolina
Maffic tuff Andesite Felsic tuff Maffic tuff Felsic tuff and rhyolite Felsic tuff and mudflow breccias Ore zone Felsic tuff Dacite Felsic tuff Laminated siltstone
Silver_Hill_Mine
Rocks that resonate like a bell when struck
felsic zone and terminating at the outer border of the intrusion. The dikes are generally 2–4 meters wide where they are in contact with the felsic unit
Ringing_rocks
Overview of geology of the Kimberley
especially prominent during its earlier stages. It was then overlain by the felsic Whitewater Volcanics, during a period of eruptions at around 1856 Ma. A
Geology of the Kimberley (Western Australia)
Geology_of_the_Kimberley_(Western_Australia)
Silicate mineral
also coexist with anthophyllite. Cummingtonite has also been found in some felsic volcanic rocks such as dacites. Manganese rich species can be found in metamorphosed
Cummingtonite
Oceanic division
margins and continental shelf mark lower density, but greater thickness felsic continental rock that is often much older than that of the seafloor. The
Atlantic_Ocean
Mountain range in South Australia
extruded, and their eroded remnants preserve one of the most voluminous felsic magmatic events preserved on earth. Basaltic and basaltic-andesite comprise
Gawler_Ranges
Low-profile volcano usually formed almost entirely of fluid lava flows
particularly powerful explosive eruptions, and rarer felsic lava shields formed by unusually fluid felsic magmas. Examples of pyroclastic shields include Billy
Shield_volcano
Iron manganese tungstate mineral
is mainly formed through magmatic-hydrothermal processes associated with felsic magmas, namely skarns, or through metamorphic processes. In the more common
Wolframite
Large region of volcanic rock in Russia
both mafic and felsic rocks are present, so this formation is officially called a Flood Basalt Province. The inclusion of mafic and felsic rock indicates
Siberian_Traps
Form of potassium feldspar
with a general formula K(AlSi3O8). Sanidine is found most typically in felsic volcanic rocks such as obsidian, rhyolite and trachyte. Sanidine crystallizes
Sanidine
Very fine-grained volcanic rock that sometimes contains larger crystals
of trap rock). The mass of the rock consists of a fine-grained matrix of felsic materials, particularly quartz, plagioclase and potassium feldspar, and
Felsite
create intermediate or felsic magmas, which in turn may reach the surface to produce small eruptions of intermediate or felsic lava. Stock (geology) Hawley
Cupola_(geology)
Hill in New Jersey, United States
consists of a linear, almost east–west trending, zone of lamprophyre and felsic dikes. The currently accepted age for the emplacement Beemerville Alkaline
Rutan_Hill
Impact structure in Western Australia
Creek Member, a 20-metre-thick (66 ft) layer of sedimentary rock including "felsic to mafic volcaniclastic rocks, chert, argillite, arenite and jaspilite intruded
Miralga_impact_structure
Geologic formation in Western Australia
blue, black, and white bedded chert; pillow basalt; carbonate rocks; minor felsic volcaniclastic sandstone and conglomerate; hydrothermal barite; evaporites;
Dresser_Formation
Geologic formation in Connecticut, United States
amphibolite and felsic gneiss; 5) felsic gneiss with scattered biotite +/-magnetite, garnet, and hornblende; 6) interbedded amphibolite and white felsic gneiss;
Collinsville_Formation
The geology of Seychelles is an example of a felsic granite microcontinent that broke off from the supercontinent Gondwana within the past 145 million
Geology_of_Seychelles
Island off the coast of Scotland
Dalradian Supergroup. Other Paleogene igneous rocks on Arran include extensive felsic and composite sills in the south of the island, and the central ring complex
Isle_of_Arran
the last six to seven million years and is primarily mafic rock with some felsic rock. Geologists debate the exact origins of the island and some have proposed
Geology_of_Ascension_Island
Feldspar mineral found in igneous rock
orthoclase. Orthoclase is a common constituent of most granites and other felsic igneous rocks and often forms huge crystals and masses in pegmatite. Typically
Orthoclase
Mountain in Montana, United States
mountain is composed of Cambrian limestone and a multiphase network of Eocene felsic porphyritic intrusions and breccia bodies. The mountain's toponym has been
Fisher_Mountain
Magnesium- and iron-rich extrusive igneous rock
spun from molten basalt Bimodal volcanism – Eruption of both mafic and felsic lavas from a single volcanic centre Plutonism – Geological theory that Earth's
Basalt
Mountain pass in Alaska, United States
from beneath the Peninsular terrane. Both deformed and undeformed small felsic dikes occur in the schist. Several bodies of serpentinite are contained
Hatcher_Pass
Includes rocks over 4 billion years old from the Hadean Eon
the geologic shields of Canada, Australia, and Africa. The ages of these felsic rocks are generally between 2.5 and 3.8 billion years. The approximate ages
Oldest_dated_rocks
Topics referred to by the same term
classification of the mineral composition of a rock, between mafic and felsic Intermediate, Michigan, a historic community Intermedia (disambiguation)
Intermediate
Volcanic complex in British Columbia, Canada
of 10–30 times over that of calc-alkaline felsic flows. As a result of this fluidity, the peralkaline felsic lava flows were able to form small-scale folds
Level_Mountain
Iron end-member of olivine, a nesosilicate mineral
occurrence is in ultramafic volcanic and plutonic rocks and less commonly in felsic plutonic rocks and rarely in granite pegmatite. It also occurs in lithophysae
Fayalite
Radiometric dating method used in geochronology
than 60 million years ago). This method is also useful for zircon-poor, felsic-to-intermediate igneous rocks, various metamorphic rocks, and evaporite
K–Ca_dating
Igneous, plutonic rock
Quartz diorite is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic texture. Feldspar is present as plagioclase (typically
Quartz_diorite
Style of reaction between magma and seawater
are several specific characteristics: Physical nature of magma: mafic to felsic. Character of explosive activity: violent ejection of solid, warm fragments
Surtseyan_eruption
Igneous rocks which have a deficiency of aluminium
peralkaline rhyolites, comendite and pantellerite, with comendite being the more felsic (silica-rich) rock. Another example is the peralkaline granite that forms
Peralkaline_rock
Mountain in Georgia, United States
which is characterized mainly by a broad southwest-to-northeast area of felsic igneous and metamorphic rock such as gneiss, schist, granite, and phyllite
Burks_Mountain
Hydrous phyllosilicate mineral
heated. It typically occurs as an alteration product at the contact between felsic and mafic or ultramafic rocks such as pyroxenites and dunites. It also occurs
Vermiculite
Geologic eon, 4031–2500 million years ago
of metamorphosed mafic igneous and sedimentary rocks, including Archean felsic volcanic rocks. The metamorphosed igneous rocks were derived from volcanic
Archean
Second planet from the Sun
indicating a different, possibly a more felsic, mineral assemblage. The mechanism to generate a large amount of felsic crust usually requires the presence
Venus
Group of rock-forming minerals
feldspar. The alternative spelling, felspar, has fallen out of use. The term "felsic", meaning light coloured minerals such as quartz and feldspars, is an acronymic
Feldspar
Crystal larger than the rock grains that surround it in an igneous rock
ISBN 978-85-85047-04-7. and Moulton, B. J. A.; et al. (2008). Volcanology of the Felsic Volcanic Rocks of the Kidd-Munro assemblage in Prosser and Muro Townships
Phenocryst
and biotite schist. Around 1.9 billion years ago, mafic, intermediate and felsic rocks, in some cases with subordinate metasedimentary rocks, began to form
Geology_of_Wisconsin
Southernmost island of the Kuril Island chain
yellowish to yellow-grey tuffs, tuffaceous sandstones and breccias, mainly of felsic to medium composition. Numerous subvolcanic stocks and plugs of andesite
Kunashir
Igneous rock
traditionally been used in the Nordic countries to describe a metamorphosed, felsic extrusive rock, corresponding to rhyolite, dacite, or rhyodacite according
Keratophyre
FELSIC
FELSIC
FELSIC
FELSIC
Boy/Male
Hindu, Indian, Tamil
Lotus; Lord Vishnu; A Tamil Saint
Boy/Male
Assamese, Hindu, Indian, Kannada, Sanskrit, Telugu
Lord of the Immovable; The Himalayas
Girl/Female
Australian, Dutch, French, German, Swedish
Bright Land
Boy/Male
Hindu
Boy/Male
Hindu, Indian
Lord Krishna
Boy/Male
Muslim
Abstemious, Ascetic, Saintly
Girl/Female
British, Indian, Russian
One of the Holy Gem Stone Blessed by Guru (Venus) Graha
Boy/Male
Tamil
Vishwambaran | விஷà¯à®µà®¾à®®à¯à®ªà®°à®£
The Lord Vishnu
Boy/Male
Tamil
Point or full stop, Rocky
Boy/Male
English
By the cross.
FELSIC
FELSIC
FELSIC
FELSIC
FELSIC