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Topic: Phyllite

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In the News (Sun 17 Jun 18)

  Phyllite   (Site not responding. Last check: 2007-10-10)
Phyllite is a fine-grained metamorphic rock formed by the low grade metamorphism of fine-grained, sedimentary rocks, such as mudstones or shales.
Phyllite has a marked fissility (a tendency to split into sheets or slabs) due to the parallel alignment of platy minerals; it may have a silky sheen on its surfaces due to tiny plates of micas.
Phyllite is formed by relatively low-grade metamorphic conditions in the lower part of the greenschist facies.
geology.csupomona.edu /alert/metamorphic/phyllite.htm   (187 words)

 Phyllite   (Site not responding. Last check: 2007-10-10)
Phyllite represents slightly higher temperature and pressure environment that slate.
Phyllites have what is known as a "phyllitic sheen".
It is similar to slatey cleavage but, because of the typically higher pressures involved in the formation of the phyllite, the pressures often contort or disrupt the simple flat planes of the slate.
www.gc.maricopa.edu /earthsci/imagearchive/phyllite.htm   (133 words)

 USGS B 2123 -- Paleozoic Rocks
Phyllite in the Loudoun Formation is tuffaceous with elongated amygdules so it may be genetically related to Catoctin volcanism (Stose and Stose, 1946; King, 1950; Reed, 1955; Toewe, 1966; Gathright and Nystrom, 1974).
Phyllite of the Loudoun Formation(-CZlp) is well exposed north of Purcell Knob on the limbs of inverted folds (pl. 1, ref. loc.
Phyllite of the Loudoun is not observed on the east side of Short Hill Mountain.
pubs.usgs.gov /bul/b2123/paleo.html   (1821 words)

 This paper deals with the lithostratigraphy and structure of the Kharidhunga Magnesite Mine area
The area is characterised by the presence of gritty phyllite, white quartzite, dolomite and fl slate in the west and gneiss and garnetiferous schist in the east with remarkable magnesite deposit.
Quartzitic dolomite, grey coloured slaty phyllite with remarkable magnesite and talc deposits, calcareous phyllite, quartzites, carbonaceous phyllites, graphitic schist and phyllite and garnetiferous schist are found in the eastern part of the study area.
The Kharidhunga Formation exposed in the Kharidhunga village 33 km in the Lamosanghu-Jiri road, is composed of grey phyllite and interbeded with garnetiferous chloritic schist and white; green and pink quartzite are the main lithology of the Kharidhunga Formation.
www.geocities.com /rkdtu/thesis1.html   (3732 words)

 Black Mountain Conservancy Geology
Phyllite is a metamorphic rock because it is the result of intense heat and pressure acting over millions of years on shale, sometimes informally known as claystone.
Phyllite forms the ridge along the northern slope to the summit.
The foliation in phyllite follows the direction of the mica crystals, which tend to grow deep underground perpendicular to the gravitational stress field.
www.blkmtnconservancy.org /geology.html   (874 words)

 Phyllite (via CobWeb/3.1 planet03.csc.ncsu.edu)   (Site not responding. Last check: 2007-10-10)
Phyllite is between slate and schist on the metamorphic scale.
Phyllite looks a lot like slate, but its glossy sheen gives it away.
Phyllite usually has cleavage and is composed mainly of very fine crystals of either muscovite or chlorite.
www.casdn.neu.edu.cob-web.org:8888 /~geology/department/staff/colgan/iceland/minerals/phyll.htm   (55 words)

 Nikon MicroscopyU: Phyllite Thin Section in Polarized Light
An examination of geological thin sections of the mineral phyllite using polarizing microscopy, as well as providing information on component minerals, can reveal a great deal about how the rock was formed.
Phyllite, a metamorphic rock, clearly shows the alignment of crystals under the effects of heat and stress.
Small scale folds are visible in the plane-polarized image and more clearly defined under crossed polars with and without the wave plate.
www.microscopyu.com /articles/polarized/phyllite.html   (203 words)

 phyllite   (Site not responding. Last check: 2007-10-10)
PHYLLITE The parent rock for phyllite is slate.
This is a microscopic, thin-section view of phyllite.
Comparison of a sample of phyllite (above) with a sample of slate (below).
seis.natsci.csulb.edu /bperry/metarock/PHYLLITE.htm   (147 words)

 Phyllite - Wikipedia, the free encyclopedia
Phyllite is a type of foliated metamorphic rock primarily composed of quartz, sericite mica, and chlorite; the rock represents a gradiation in the degree of metamorphism between slate and mica schist.
Its constituent platy minerals are larger than those in slate but are not visible with the naked eye.
Phyllites are said to have a "phyllitic texture" and are usually classified as having a low grade on the Barrovian Sequence.
en.wikipedia.org /wiki/Phyllite   (135 words)

The original rock of the area is phyllite - the phyllite in contact with heat from the intrusion was metamorphosed into hornfels.
It is believed that the hornfels derived from phyllite which had recrystallised through heat from the nearby intrusion.
The phyllite was altered into hornfels as a results of heat from a granite intrusion (this process is referred to as contact metamorphism; heat rather than pressure was the main agent of recrystallisation).
www.vnc.qld.edu.au /enviro/landform/landf-mc.htm   (963 words)

 PHYLLITE (Gr. 40)XAov,... - Online Information article about PHYLLITE (Gr. 40)XAov,... (via CobWeb/3.1 ...   (Site not responding. Last check: 2007-10-10)
mineral constitution to the phyllites, but are finer grained and are distinguished also by a very much better cleavage.
rutile, so often seen in clay-slates, are not often met with in phyllites, but this mineral forms small prisms which may be intergroivn with fl magnetite; at other times it occurs as networks of sagenite.
From the imperfection of their cleavage phyllites are rarely suitable for roofing materials; their softness renders them valueless as road stones, but they are not uncommonly employed as inferior See also:
encyclopedia.jrank.org.cob-web.org:8888 /PER_PIG/PHYLLITE_Gr_40_XAov_a_leaf_prob.html   (698 words)

 [No title]   (Site not responding. Last check: 2007-10-10)
King Albite is to abdicate in favor of Phyllite and devote: his days to science, but the unexpected arrival of a party of Tech co-eds in a flying-machine upsets all plans.
But luckily for Phyllite, Princess Beryl has cap- tivated the heart of Topaz, a robber chief, and she goes to him for aid.
Phyllite is crowned, Topaz is forgiven and wins Beryl's hand, the royal secretary wooes Polly Con, and the king extends his blessing to all.
www-tech.mit.edu /archives/VOL_022/TECH_V022_S0279_P005.txt   (321 words)

 Weekend 2
The Dalles Bridge is along the Easton Terrane which is part of the Northwestern Cascades.
The primary component of Darrington Phyllite is metasediments that were deposited on the seafloor, while the Shuksan Schist are metabasalt that was previously part of an ancient seafloor.
After the initial metamorphism, the phyllite folded as Wrangella collided with North America 90 million years ago.
www.ac.wwu.edu /~babcock/v31_1.html   (288 words)

 Official Series Description - SYLCO Series
They formed in residuum that is affected by soil creep in the upper part, and weathered from metasedimentary rocks such as phyllite, slate, and metsandstone.
Amount of thin, flat fragments of phyllite, metasandstone, or of slate ranges from about 10 to 50 percent in the A horizon, 15 to 45 percent in the B horizon, and from 40 to 70 percent in the C horizon.
The soil formed in residuum that is affected by soil creep in the upper part, and weathered from metasedimentary rocks such as metasandstone, slate and phyllite.
ortho.ftw.nrcs.usda.gov /osd/dat/S/SYLCO.html   (959 words)

 Geologic Maps of Maryland: Rocks of the South Mountain Anticlinorium and Frederick Valley
Brown to dark bluish-gray banded shale, light bluish-gray, finely laminated phyllite; distinctively pale purple in basal part; bedding obscured by cleavage; increasingly metamorphosed toward east from shale to slate and phyllite; estimated thickness 2,000 feet.
Interbedded white to dark gray, thin-bedded micaceous, ferruginous, and sericitic quartzites, phyllites, and white, thick-bedded, ledge-making quartzites; some gray to brown ferruginous quartz conglomerate and purple-banded phyllite; thickness approximately 100 feet in south, increases to 425 feet in north.
Thick-bedded metabaslt with amygdaloidal layers and secondary veins of quartz, calcite, and epidote; interbedded green tuffaceous phyllite and blue amygdaloidal metaandesite.
www.mgs.md.gov /esic/geo/lgsmfv.html   (490 words)

 [No title]   (Site not responding. Last check: 2007-10-10)
Phyllites are fine-grained metamorphic rocks with well developed foliation, or alignment of platy or elongate grains.
Phyllites typically consist of micas, quartz, and sodic plagioclase, formed during recrystallization of shales during regional dynamothermal metamorphism.
The photo (crossed polarizers) shows strongly aligned, brightly colored muscovite, darker biotite, and light gray quartz and feldspars.
sorrel.humboldt.edu /~jdl1/web.page.images/phyllite1.html   (52 words)

Unlike a slate the crystals in this phyllite have grown larger and light reflects more easily off the cleavage faces, leading to a high light reflectance (scheen), a characteristic feature of phyllite.
Since light reflection is so important in getting a feel for this rock, typically the first thing a geologist does upon picking it up is to turn it over and over to catch all the properties and way light reflects.
Slates are part of a metamorphic sequence that begins with shale and progresses through slate, phyllite, schist, and gneiss.
csmres.jmu.edu /geollab/Fichter/MetaRx/Rocks/phyllite1.html   (175 words)

 Magnus Resources Inc.
This hole went through a series of veining and breccia zones, in both carbonaceous phyllite shale and mudstone) and quartz phyllite (sandstone and siltstone) and intersected several sulphide-bearing intervals.
a sandy unit (quartz phyllite) between an upper and a lower muddy unit (carbonaceous phyllite).
Drilling revealed veining and brecciation at various areas along the hole with the most intense concentration found in quartz phyllite situated near the middle part of the hole.
www.magnusresources.com /hui_dong_recent_updates.php   (1283 words)

 Baraboo Rocks   (Site not responding. Last check: 2007-10-10)
The cleavage orientation changes dramatically between the nearly massive quartzite and the finely cleaved phyllite.
This is the most famous rock in the Baraboo region- known as Van Hise Rock (named after the famous geologist C. Van Hise).
In this photo, you can see an excited structural geologist marking the vertical (upturned) bedding with her torso, and marking cleavage orientations in the phyllite and quartzite layers with her arms.
www.uwm.edu /~dyanna/baraboorocks.html   (243 words)

 Official Series Description - DIOBSUD Series
The Diobsud series consists of moderately deep, moderately well drained soils formed in colluvium and glacial till high in phyllite with an admixture of volcanic ash.
The particle size control-section averages 20 to 35 percent unweathered phyllite fragments.
The soils formed in glacial till high in phyllite with an admixture of volcanic ash.
ortho.ftw.nrcs.usda.gov /osd/dat/D/DIOBSUD.html   (954 words)

 Phyllite   (Site not responding. Last check: 2007-10-10)
Phyllite is a foliated rock formed by the continued metamorphism of slate.
As temperature increase, these clays are transformed into much larger, although still invisible to the eye, crystals of muscovite.
Notice that it is far glossier, shinier, than is the slate.
www.jsu.edu /depart/geography/mhill/phylabtwo/lab3/phyllite.html   (54 words)

 Physical Geology Meta. Rx. Samples
*Note: Phyllite has a texture that is intermediate between slate and schist.
Characteristics: planar alignment of microscopic clay grains cause the rock to break in parallel layers (slaty cleavage).
Phyllite is a low-grade foliated metamorphic rock that is intermediate in grade between slate and schist.
itc.gsw.edu /faculty/tweiland/metarx.htm   (274 words)

 (phyllite) schist   (Site not responding. Last check: 2007-10-10)
Since these newly formed minerals often display - yes you guessed it - preferred orientation they all reflect the light at very similar angles, making the surface shiny even though the individual crystals are too small to see.
These rocks are called phyllites, or phyllite schists.
The image below shows a phyllite schist from Wyoming with nice shiny surfaces.
www.trincoll.edu /~cgeiss/courses/mamo/schist.htm   (242 words)

 The Sphakia Survey: Internet Edition
The grits are blue to pink in colour and have been identified by petrography as phyllite.
Usually handbuilt thick bodied sherds, but it can also occur in thinner, carefully worked shapes, including a small footed shape (Aradena (3.20) P05), and 2 examples of herringbone incised decoration (Livaniana Akropolis (5.01) P09).
A very hard,thin,redbrown to pinkish (5yr6/4) surface with a dark grey core (2.5yr5/0) with large (up to 7.5mm), slightly lustrous, white rhomboidal shaped inclusions, identified by petrography as phyllite.
sphakia.classics.ox.ac.uk /fabric/phyllite.html   (386 words)

 Terranes of the North Cascades: Easton
Metamorphosed at especially high pressure to the Darrington Phyllite and Shuksan Greenschist respectively.
The uppermost terrane in the Western Domain, the Easton terrane, was originally oceanic basalt and overlying deep-ocean mud and sand.
The basalt became what has long been called the Shuksan Greenschist; and the overlying sediments became what is known as the Darrington Phyllite.
www2.nature.nps.gov /geology/usgsnps/noca/t4easton.html   (327 words)

MAGNETIC AND MINERALOGICAL INVESTIGATIONS OF PHYLLITE LAYERS FROM THE BARABOO AREA, WI KELLY, Colleen, Geoscienecs, Univ of Wisconsin-Milwaukee, P.O.Box 413, Milwaukee, WI 53201, colleenk@uwm.edu and KEAN, William F., Geosciences, Univ of Wisconsin-Milwaukee, P.O.Box 413, Milwaukee, WI 53201,
We investigated the magnetic mineralogy and remanent magnetic directions of phyllite layers in the Baraboo area of Wisconsin to aid in resolving the deformation age of the syncline.
The phyllites, which were originally clay-rich layers of sediment, are assumed to have formed during the deformational formation of the Baraboo Syncline.
gsa.confex.com /gsa/2001NC/finalprogram/abstract_5604.htm   (201 words)

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