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Topic: Foliation (geology)


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In the News (Thu 23 May 19)

  
 USGS B 2123 -- Structural Geology
Gneissic foliations in the Middle Proterozoic rocks are planar zones of dark- and light-colored minerals in leucocratic and melanocratic layers that range from 1 cm to 0.5 m thick.
Gneissic foliation in the garnet monzogranite and biotite gneiss is nearly flat lying along the bluffs of the Potomac River east of Short Hill Mountain (fig.
Mylonitic foliation is marked by planar aggregates of sericite, chlorite, and fine-grained recrystallized quartz in the otherwise massive gneiss.
pubs.usgs.gov /bul/b2123/struct.html   (3052 words)

  
 Shear band foliation as an indicator of sense of shear; field observations in central Spain -- Weijermars and Rondeel 12 (10): 603 -- Geology
Shear band foliation as an indicator of sense of shear; field observations in central Spain -- Weijermars and Rondeel 12 (10): 603 -- Geology
Shear band foliation as an indicator of sense of shear; field observations in central Spain
The Macizo de Nevera, a Paleozoic basement inlier surrounded by essentially flat-lying Mesozoic cover rocks, exhibits an extremely consistent system of steep, dextral strike-slip faults.
geology.geoscienceworld.org /cgi/content/abstract/12/10/603   (169 words)

  
 Sill (geology) - Open Encyclopedia
In geology, a sill is a tabular, horizontal mass of igneous rock that has been intruded laterally between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic rock.
www.open-encyclopedia.com /Sill_%28geology%29   (55 words)

  
 North Cascades Geology: Annealing the Parts-Metamorphism
Large tracts of land began as igneous plutonic rock, now commonly with metamorphic foliation and/or lineation; Such plutonic rocks are called orthogneiss (literally meaning "straight gneiss"), by which geologists mean gneiss derived from igneous plutonic rocks rather than from the thorough metamorphism of sedimentary or volcanic rocks.
The rocks of the Metamorphic Core Domain, the most rugged and mountainous part of the North Cascades, were created or modified during such a metamorphism at the bottom of a thrust stack, most of which began about 90 million years ago.
The metamorphic Skagit Gneiss Complex is derived from the metamorphosed strata of the Chelan Mountains terrane by intrusion of many igneous sills and dikes, which were then metamorphosed.
www2.nature.nps.gov /geology/usgsnps/noca/nocageol6.html   (55 words)

  
 Physical Geology Slides-Crustal Deformation
Several minor folds are visible, the foliation is parallel to their axial planes, and the thickness of the beds measured parallel to the axial planes is nearly constant.
The significance of these minor folds is that the geologist can tell which side of a large fold she is on and locate its axial plane by observing the shapes of the small folds.
The outer surface of the ridge is a folded layer of resistant rock.
www.uwgb.edu /dutchs/EarthSC202Slides/struslid.htm   (1752 words)

  
 rodhpubs.html
Geology of the metamorphic units of the North D'Aguilar Block - Goomeri, Nanango and Nambour 1:100 000 sheet areas.
Regional Geology, Tectonics and metallogenesis, New England Orogen, NEO ’99, Dept of Earth Sciences, University of New England, Armidale, 275-284.
Abstracts, Conference on reaction mechanisms and microstructure, fabric and foliation development in tectonites, Mission Beach, Qld.
www.earthsciences.uq.edu.au /~rodh/publications/rodhpubs.html   (2960 words)

  
 Journal Contents - 3D spiral inclusion trail development
Reversals may indicate either a change in the sense of matrix shear, or alternatively a change in the relative rate of rotation of sphere and matrix foliation.
This is of significance for studies that seek to measure the orientation of inclusion trails within a population of porphyroblasts, or correlate sections of inclusion trail between different porphyroblasts on the basis of orientation.
Movies of serial slices through the simulated spirals can be used as an aid to interpret the wide range of inclusion trail geometries commonly observed in thin sections in terms of the orientation of the thin section with respect to the spiral axis.
www.virtualexplorer.com.au /2002/9/stallard/paper4.html   (1676 words)

  
 Sill (geology) - Enpsychlopedia
In geology, a sill is a tabular, often horizontal mass of igneous rock that has been intruded laterally between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic rock.
www.grohol.com /psypsych/Sill_%28geology%29   (214 words)

  
 References
Haneberg, W.C., 1990, A Lagrangian interpolation method for three-point problems: Journal of Structural Geology, v.
Hanmer, S 1986 :Asymmetrical pul-aparts and foliation fish as kinematic Indicators.
Weiss, L.E., 1969, Flexural-slip folding of foliated model materials: in A.J. Baer and D.K. Norris, editors, Research in Tectonics, Geological Survey of Canada, Paper 68-52, p.
www.structural-geology-portal.com /references.html   (214 words)

  
 Geologic Map of the Riverside East 7.5' Quadrangle, Riverside County, California
Geologic mapping and digital preparation of this report were sponsored jointly by (1) the National Cooperative Geologic Mapping Program of the U.S. Geological Survey, (2) the California Division of Mines and Geology, (3) the Southern California Areal Mapping Project (SCAMP), and (4) the U.S. Air Force.
The geologic map database of the Riverside East 7.5' quadrangle contains new data that have been subjected to rigorous review and are a substantially complete representation of the current state of knowledge concerning the geology of the quadrangle.
Geological point data includes site-specific information describing the types and the orientation of bedding, foliation, and lineations.
geo-nsdi.er.usgs.gov /metadata/open-file/01-452/metadata.faq.html   (2404 words)

  
 Charles Darwin - South American Geology Page 128
For a space of 300 miles on the shores of the Chonos and Chiloe Islands, we have seen that the foliation seldom deviates more than a point of the compass from a N. 19 degrees W. and S. 19 degrees E. strike.
With respect to both foliation and cleavage becoming tortuous where quartz-veins abound, I have seen instances near Monte Video, at Concepcion, and in the Chonos Islands.
For analogous cases in clay-slate, see Professor Henslow's Memoir in "Cambridge Philosophical Transactions" volume 1 page 379, and Macculloch's "Classification of Rocks" page 351.
charles-darwin.classic-literature.co.uk /south-american-geology/ebook-page-128.asp   (2404 words)

  
 Rock Springs
This rock is pictured in geologic books as a type illustrating important principles of structural geology and has been a point of special interest to many investigators in geology visiting this region.
It was here that Van Hise and his associates developed many of the relationships between bedding and foliation that structural geologists use routinely.
The material of this rock was once sand on the sea bottom and has since hardened into quartzite.
www.uwsp.edu /geo/projects/geoweb/participants/dutch/geolwisc/GEOSTOPS/rocksprs.htm   (794 words)

  
 References
Weinberger, Ram, Amotz Agnon, Hagai Ron and Zvi Garfunkel, 1995, Rotation about an inclined axis: three dimensional matrices for reconstructing paleomagnetic and structural data: Journal of Structural Geology, v.
Hanmer, S 1986 :Asymmetrical pul-aparts and foliation fish as kinematic Indicators.
Weiss, L.E., 1969, Flexural-slip folding of foliated model materials: in A.J. Baer and D.K. Norris, editors, Research in Tectonics, Geological Survey of Canada, Paper 68-52, p.
www.structural-geology-portal.com /references.html   (7675 words)

  
 Geology Driving Tour
It is identified by distinct foliation, which is a geologic term meaning very fine layering.
During the Paleozoic Era, this area was a basin covered by a shallow sea that, over millions of years, deposited a thick blanket of sediments over the Precambrian igneous and metamorphic rocks.
Geologic time lines are expressed in geologic eras and periods.
www.nps.gov /wica/Geology_Driving_Tour.htm   (1095 words)

  
 Sill (geology) - Wikipedia, the free encyclopedia
In geology, a sill is a tabular, often horizontal mass of igneous rock that has been intruded laterally between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic rock.
Certain mafic and ultramafic layered intrusions are a variety of sill that often contain important ore deposits.
The term sill is synonymous with concordant intrusive sheet.
en.wikipedia.org /wiki/Sill_(geology)   (179 words)

  
 metamorphism on Encyclopedia.com
METAMORPHISM [metamorphism] in geology, process of change in the structure, texture, or composition of rocks caused by agents of heat, deforming pressure, shearing stress, hot, chemically active fluids, or a combination of these, acting while the rock being changed remains essentially in the solid state.
Further higher-grade metamorphic conditions lead to a foliation called schistosity, resulting in schists, formed when tabular minerals, such as hornblende, graphite, mica, or talc are aligned and tightly packed in a parallel fashion.
Metamorphic rocks that develop by shearing and crushing of the rock at low temperature are called cataclastic and are usually associated with the mechanical forces, especially pressure, involved in faulting (see fault).
www.encyclopedia.com /html/m1/metamorpsm.asp   (831 words)

  
 Geology of Namew Lake, Manitoba
Parts of the host pyroxenite still had some igneous minerals, including pentlandite, pyrrhotite, and chalcopyrite (bright blebs), some olivine and pyroxene (pale), but also contain ubiquitous metamorphic minerals (dark amphiboles arranged in the M1 foliation).
Our work (Menard et al., 1996) established that the host pyroxenite was emplaced as a sill and affected by the same deformational and metamorphic events as the country rock gneisses.
M5 produced tremolite, the third distinctive amphibole, in the margins of the metapyroxenite and produced partial serpentization of the remaining igneous olivine and Opx and M3 talc.
www.geo.ucalgary.ca /~tmenard/ores/namewSeg.html   (831 words)

  
 Mineralogical Record: Geology of the Sweet Home mine and Alma district
Where undisturbed, the foliation trends approximately east-west and dips moderately to the south; this is consistent with the trend observed during surface mapping in Buckskin Gulch.
Examination of the underground workings at the Tanner Boy and Queen Mary mines on the west side of Buckskin Gulch confirmed the continuity of the vein swarm to the southwest.
However, correlation of individual veins from the southwest to northeast across Buckskin Gulch is tenuous.
www.findarticles.com /p/articles/mi_qa3672/is_199807/ai_n8792822   (1239 words)

  
 The Potomac-Shenandoah River System The Geology of Virginia
Most of the rapids and riffles in this stretch of the river occur as the water drops over bedding and foliation planes.
One kilometer east of Catoctin Mountain, the Potomac crosses the western border fault of the Mesozoic Culpeper basin.
The North Fork of the Shenandoah River heads in the mountainous terrain of the Ridge & Valley subprovince of northwestern Rockingham County.
www.wm.edu /geology/virginia/rivers/potomac-shenandoah.html   (1545 words)

  
 AusStats : Special Article - The Geology of Australia
Except where purely local disturbances have taken place, the planes of foliation lie in a north-westerly direction, or paraIlel to the bug axis of the basic lenses, whilst the quartz reefs or lodes usually follow them, thus presenting a bedded appearance.
It is probable, however, that the basic dykes also traverse the basic rocks, and the acidic the gneisses, but owing to their similarity in a weathered condition at the surface, it is difficult to determine their presence.
Basic dykes can be observed intersecting the gneissic rocks, whilst porphyritic and granite dykes are of common occurrence in the basic zone.
www.abs.gov.au /Ausstats/abs%40.nsf/94713ad445ff1425ca25682000192af2/2b69a0f02f44c730ca2569de001f1083!OpenDocument   (13433 words)

  
 Bibliografia relativa alla geologia delle Alpi occidentali (Italy).References about geology of the North - Western italian Alps.
Capponi G. and Crispini L. Progressive shear deformation in the metasediments of the Voltri Group (Ligurian Alps, Italy): occurence of structures recording extention parallel to the regional foliation.
Hoogerduijn Strating E., Piccardo G.B.,Rampone E. and Scambelluri M. and Vissers R. The structure and petrology of the Erro – Tobbio peridotite, Voltri Massif, Ligurian Alps, Guidebook for a two-day-excursion with amphasis on processes in the upper mantle (Voltri Massif, June 26 – 28, 1989).
Capponi G. Megastructure of the South – Eastern part of the Voltri Group (Ligurian Alps): a tentativ interpretation.
italiangeology.tripod.com /Bibliografia.htm   (13433 words)

  
 Darwin Correspondence Project: Introduction to Volume 4: 1847-1850
Darwin maintained that cleavage was the result of differences in mechanical tension that affected the crystallising and concretionary processes in rocks and that foliation was a further stage of the same process.
Darwin was asked by the editor, Sir John Frederick William Herschel, to write the chapter on geology (letter to J. Herschel, 4 February [1848]).
Darwin was much shaken by Milne's evidence, especially as he realised that it made plausible the theory of Louis Agassiz, who had proposed that a glacier blocking the foot of Glen Roy had produced a lake and the consequent beaches.
www.lib.cam.ac.uk /Departments/Darwin/intros/vol4.html   (13433 words)

  
 Geology 200A - Lab 2 (Ophiolites)
Vocabulary: talc serpentine olivine bronzite clinopyroxene spinel chromite magnetite plagioclase amphibole epidote chlorite lherzolite harzburgite dunite wehrlite websterite anorthosite troctolite gabbro trondhjemite gabbro basalt chert cumulate intercumulus tectonite segregation pegmatite breccia pillow veins xenocryst restite foliation honeycomb effusive aphyric microlites phenocryst lythophysae variolites chilled.
004 2-2e1 2-2e2 3 samples: orange/brown weathered serpentinized knobbly harzburgite composed of serpentinized olivine, orthopyroxene, and black spinel; this sample represents partially melted mantle lherzolite from which all clinopyroxene has been removed into the basaltic melt; it is a mantle restite.
005 2-2d : orange/brown weathering, smooth surfaced, serpentinized (matte black) dunite with black grains of chromite; the rock, in as much as it is composed of olivine and chromite only, represents the residue remaining from the high temperature melting removal of all clino- and ortho-pyroxene from the primitive mantle lherzolite represented by sample 2-2c;.
instruct.uwo.ca /earth-sci/200a-001/200lab2.htm   (13433 words)

  
 DLESE Find a Resource > Subject: Geology
Foliation, lineation, cleavage, schistosity, gneissose structure, hornfels, and granofels are discussed.
Eclogite, granulite, amphibolite, blueschist, greenschist, prehnite-pumpellyite, zeolite, sanidinite, pyroxene hornfels, hornblende hornfels, and albite-epidote hornfels facies are defined...
Metamorphism in pelitic hornfels rocks is also discussed and migmatitic textures are illustrated.
www.dlese.org /dds/browse_su_0e-1200.htm   (416 words)

  
 Black Mountain Conservancy Geology
The foliation in phyllite follows the direction of the mica crystals, which tend to grow deep underground perpendicular to the gravitational stress field.
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.
www.blkmtnconservancy.org /geology.html   (874 words)

  
 Geology 200A - Lab 2 (Ophiolites)
Vocabulary: talc serpentine olivine bronzite clinopyroxene spinel chromite magnetite plagioclase amphibole epidote chlorite lherzolite harzburgite dunite wehrlite websterite anorthosite troctolite gabbro trondhjemite gabbro basalt chert cumulate intercumulus tectonite segregation pegmatite breccia pillow veins xenocryst restite foliation honeycomb effusive aphyric microlites phenocryst lythophysae variolites chilled.
005 2-2d : orange/brown weathering, smooth surfaced, serpentinized (matte black) dunite with black grains of chromite; the rock, in as much as it is composed of olivine and chromite only, represents the residue remaining from the high temperature melting removal of all clino- and ortho-pyroxene from the primitive mantle lherzolite represented by sample 2-2c;.
Click here to return to Earth Science course list.
instruct.uwo.ca /earth-sci/200a-001/200lab2.htm   (874 words)

  
 Geology 200A - Lab 2 (Ophiolites)
020 2-7a: dark grey, compositionally layered and foliated gabbro composed of clinopyroxene and plagioclase; basal cumulate of an ophiolite gabbro layer; this rock has a primary high temperature 'plastic' foliation induced during sea-floor spreading.
034 2-9b1: 2-9b2 dull green, aphanitic small pillow basalt with spherical aggregates of feldspar and pyroxene microlites called lithophysae (this texture is known as variolitic texture); rapid nucleation from chilling of the hot lava by cold seawater; uppermost effusive unit of the ophiolite.
031 2-8d: feldspar porphyric diabase dike; feldspars occur as both large crystals (phenocrysts), and as microlitic laths; sheeted dike unit of an ophiolite.
instruct.uwo.ca /earth-sci/200a-001/200lab2.htm   (902 words)

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