Simple Lithology

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piedra / wacke
definition Clastic sandstone with more than 10 percent matrix of indeterminate detrital or diagenetic nature. Matrix is mud size silicate minerals (clay, feldspar, quartz, rock fragments, and alteration products). more like this
example graywacke more like this
note Distinction from mudstone is based on inference that less that 50 percent of the mud size fraction (matrix) is original mud size detrital particles. May also grade into diamictite or conglomerate based on size distribution of discernible particles. If more than 50 percent of rock is detrital particles of intrabasinal orgin and carbonate composition, categorize as carbonate wackestone. Term is typically applied to diagenetically altered volcanic-lithic clastic rocks in which the definition of the original clasts has been obscured. Suggested boundaries between wacke and arenite range from 5 to 15 percent matrix. See Dickinson (1970) for discussion of interpretation of undiscernible matrix in diagenetically altered lithic clastic rocks. Dickinson, W.R., 1970, Interpreting detrital modes of graywacke and arkose: Journal of Sedimentary Petrology, v. 40, p. 695-707. more like this
source Pettijohn, Potter, Siever, 1972, Sand and Sandstone: New York, Springer Verlag, 681 p. more like this
type
Resource
Concept
broader clastic sandstone
in scheme simplelithology
unconsolidated material
definition compoundMaterial composed of an aggregation of particles that do not adhere to each other strongly enough that the aggregate can be considered a solid in its own right. more like this
narrower anthropogenic unconsolidated material
broader unconsolidated material
natural unconsolidated material
narrower
sediment
tephra
broader unconsolidated material
source This vocabulary more like this
type
Resource
Concept
broader compound material
narrower
rock
sedimentary material
unconsolidated material
in scheme simplelithology
ultramafic igneous rock
definition Igneous rock that consists of greater than 90 percent mafic minerals. more like this
example alkremite more like this
narrower hornblendite
broader ultramafic igneous rock
komatiitic rock
broader ultramafic igneous rock
peridotite
broader ultramafic igneous rock
pyroxenite
broader ultramafic igneous rock
source LeMaitre et al. 2002; Gillespie and Styles 1999 more like this
type
Resource
Concept
broader igneous rock
narrower
ultrabasic igneous rock
ultramafic igneous rock
broader rock
in scheme simplelithology
ultrabasic igneous rock
definition Igneous rock with less than 45 percent SiO2. more like this
source after LeMaitre et al. 2002 more like this
type
Resource
Concept
broader igneous rock
in scheme simplelithology
tuffit / tuffite
definition Rock consists of more than 50 percent particles of indeterminate pyroclastic or epiclastic origin and less than 75 percent particles of clearly pyroclastic origin. commonly the rock is laminated or exhibits size grading. (based on LeMaitre et al. 2002; Murawski and Meyer 1998). more like this
example volcaniclastic sedimentary rock more like this
note In practice, it is likely that any rock for which there is suspicion that it may consist of redeposited pyroclastic material, usually based on sedimentary structures, irrespective of the presence or percentage of clearly epiclastic particles, would be called a tuffite. 50 percent cutoff with epiclastic rock is in contrast with LeMaitre et al., but is used for consistentency with other sedimentary rock categories following the pattern that the rock name reflects the predominant constituent. more like this
source LeMaitre et al. 2002; Murawski and Meyer 1998 more like this
type
Resource
Concept
broader rock
in scheme simplelithology
tuff breccia agglomerate or pyroclastic breccia
definition Pyroclastic rock in which greater than 25 percent of particles are greater than 64 mm in largest dimension. Includes agglomerate, pyroclastic breccia of Gillespie and Styles (1999) more like this
source Schmid 1981; LeMaitre et al. 2002 more like this
type
Resource
Concept
broader pyroclastic rock
narrower tuff breccia agglomerate or pyroclastic breccia
in scheme simplelithology
travertine
broader chemical sedimentary material
broader sedimentary material
narrower travertine
limestone
narrower travertine
definition Biotically or abiotically precipitated calcium carbonate, from spring-fed, heated, or ambient-temperature water. May be white and spongy, various shades of orange, tan or gray, and ranges to dense, banded or laminated rock. Macrophytes, bryophytes, algae, cyanobacteria and other organisms often colonize the surface of travertine and may be preserved, to produce the porous varieties. more like this
example
calcareous sinter more like this
onyx marble more like this
tufa more like this
source Neuendorf et al. 2005; http://en.wikipedia.org/wiki/Travertine; Chafetz, H.S., and Folk, R.L., 1984, Travertine: Depositional morphology an dthe bacterially constructed constituents: J. Sed. Petrology, v. 126, p.57-74. more like this
type
Resource
Concept
in scheme simplelithology
trachytoid
definition Fine grained igneous rock than contains less than 90 percent mafic minerals, less than 10 percent feldspathoid mineral and less than 20 percent quartz in the QAPF fraction and has a plagioclase to total feldspar ratio less than 0.65. Mafic minerals typically include amphibole or mica; typically porphyritic. Includes rocks defined modally in QAPF fields 6, 7 and 8 (with subdivisions) or chemically in TAS Field T as trachyte or latite. more like this
example
basaltic-trachyandesite more like this
benmoreite more like this
hawaiite more like this
mugearite more like this
potassic-trachybasalt more like this
shoshonite more like this
trachyandesite more like this
trachybasalt more like this
trachydacite more like this
trachyte(TAS) more like this
narrower alkali feldspar trachytic rock
broader trachytoid
latitic rock
broader trachytoid
trachytic rock
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader fine grained igneous rock
narrower
rhyolitoid
tephritoid
trachytoid
in scheme simplelithology
trachytic rock
definition Trachytoid that has a plagioclase to total feldspar ratio between 0.1 and 0.35. QAPF fields 7, 7', and 7*. more like this
narrower foid bearing trachyte
broader trachytic rock
quartz trachyte
trachyte
note LeMaitre et al. (2002) used 'trachyte' to refer to QAPF fields 7, 7', and 7* in the text (p. 30) as well as to the more restrictive category (QAPF field 7 only). The term Trachytic rock is introduced here to label this more general category of trachyte. more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader trachytoid
in scheme simplelithology
trachyte
definition Trachytoid that has a plagioclase to total feldspar ratio between 0.1 and 0.35, between 0 and 5 percent quartz in the QAPF fraction, and no feldspathoid minerals. QAPF field 7. more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader trachytic rock
in scheme simplelithology
tonalite
definition Granitoid consisting of quartz and intermediate plagioclase, usually with biotite and amphibole. Includes rocks defined modally in QAPF field 5; ratio of plagioclase to total feldspar is greater than 0.9. more like this
example
plagiogranite more like this
trondhjemite more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader granitoid
narrower tonalite
in scheme simplelithology
tholeiitic basalt
definition Tholeiitic basalt is defined here to contain 2 pyroxene phases and interstitial quartz or tridymite or cristobalite in the groundmass. Pyroxene (augite and orthopyroxene or pigeonite) and calcium-rich plagioclase are common phenocryst minerals. Olivine may also be a phenocryst, and when present, may have rims of pigeonite. Only in tholeiitic basalt is olivine in reaction relationship with melt. Interstitial siliceous residue may be present, and is often glassy. Tholeiitic basalt is relatively poor in sodium. This category includes most basalts of the ocean floor, most large oceanic islands, and continental flood basalts such as the Columbia River Plateau. more like this
note Definition of tholeiite and alkali basalt here are more proscriptive than those found in most reference authorities. This is to actually provide some descriptive criteria to allow assignment of rocks on a hand sample basis to the tholeiite or alkali basalt categories if detailed petrographic or chemical data are available. more like this
source http://en.wikipedia.org/wiki/Basalt; Carmichael, I.S. Turner, F.J., Verhoogen, John, 1974, Igneous petrology: New York, McGraw HIll Book Co., p.42-43. more like this
type
Resource
Concept
broader basalt
narrower tholeiitic basalt
in scheme simplelithology
tephritoid
alt label
tephritic rock more like this
definition Fine grained igneous rock than contains less than 90 percent mafic minerals, between 10 and 60 percent feldspathoid mineral in the QAPF fraction and has a plagioclase to total feldspar ratio greater than 0.5. Includes rocks classified in QAPF field 13 and 14 or chemically in TAS field U1 as basanite or tephrite. more like this
narrower basanite
broader tephritoid
phonolitic basanite
broader tephritoid
phonolitic tephrite
broader tephritoid
tephrite
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader fine grained igneous rock
in scheme simplelithology
tephritic phonolite
definition Phonolitoid that has a plagioclase to total feldspar ratio between 0.1 and 0.5. Broadly corresponds to TAS tephriphonolite of TAS field U3. more like this
example tephriphonolite more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader phonolitoid
narrower tephritic phonolite
in scheme simplelithology
tephritic foidite
definition Foiditoid that contains less than 90 percent feldspathoid minerals in the QAPF fraction, and has a plagioclase to total feldspar ratio that is greater than 0.5, with less than 10 percent normative olivine more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader foiditoid
narrower tephritic foidite
in scheme simplelithology
tephrite
definition Tephritoid that has a plagioclase to total feldspar ratio greater than 0.9, and contains less than 10 percent normative (CIPW) olivine. more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader tephritoid
in scheme simplelithology
tephra
broader natural unconsolidated material
pyroclastic material
narrower tephra
definition Unconsolidated pyroclastic material in which greater than 75 percent of the fragments are deposited as a direct result of volcanic processes and the deposit has not been reworked by epiclastic processes. Includes ash, lapilli tephra, bomb tephra, block tephra and unconsolidated agglomerate. more like this
narrower ash and lapilli
broader tephra
ash breccia bomb or block tephra
broader tephra
source Hallsworth and Knox 1999; LeMaitre et al. 2002 more like this
type
Resource
Concept
in scheme simplelithology
syenogranite
definition Granite that has a plagiolcase to total feldspar ratio between 0.10 and 0.35. QAPF field 3a. more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader granite
narrower syenogranite
in scheme simplelithology
syenitoid
definition Phaneritic crystalline igneous rock with M less than 90, consisting mainly of alkali feldspar and plagioclase; minor quartz or nepheline may be present, along with pyroxene, amphibole or biotite. Ratio of plagioclase to total feldspar is less than 0.65, quartz forms less than 20 percent of QAPF fraction, and feldspathoid minerals form less than 10 percent of QAPF fraction. Includes rocks classified in QAPF fields 6, 7 and 8 and their subdivisions. more like this
narrower alkali feldspar syenitic rock
broader syenitoid
monzonitic rock
broader syenitoid
narrower quartz monzonite
syenitic rock
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader phaneritic igneous rock
narrower
quartz rich igneous rock
syenitoid
in scheme simplelithology
syenitic rock
definition Syenitoid with a plagioclase to total feldspar ratio between 0.1 and 0.35. Includes rocks in QAPF fields 7, 7*, and 7'. more like this
narrower foid bearing syenite
broader syenitic rock
quartz syenite
syenite
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader syenitoid
in scheme simplelithology
syenite
definition Syenitic rock that contains between 0 and 5 percent quartz and no feldspathoid mineral in the QAPF fraction. Defined modally in QAPF Field 7. more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader syenitic rock
in scheme simplelithology
spilite
definition Altered basic to intermediate composition fine-grained igneous rock in which the feldspar is partially or completely composed of of albite, typically accompanied by chlorite, calcite, quartz, epidote, prehnite, and low-tempaerature hydrous crystallization products. Preservation of eruptive volcanic features is typical. more like this
example
meta-andesite more like this
metabasalt more like this
source Fettes and Desmon, 2007; Best, M.G., 1982, Igneous and metamorphic petrology: New York, W.H. Freeman and company, p. 398; Neuendorf et al. 2005, p. 619. more like this
type
Resource
Concept
broader metasomatic rock
narrower
skarn
spilite
in scheme simplelithology
slate
definition compact, fine grained rock with an average grain size less than 0.032 millimeter and a well developed schistosity (slaty cleavage), and hence can be split into slabs or thin plates. more like this
source NADM metamorphic rock vocabulary SLTTm1.0; Neuendorf et al. 2005 more like this
type
Resource
Concept
broader foliated metamorphic rock
narrower
schist
slate
in scheme simplelithology
skarn
alt label
exoskarn more like this
tactite more like this
definition Metasomatic rock consisting mainly of Ca-, Mg-, Fe-, or Mn-silicate minerals, which are free from or poor in water. Typically formed at the contact between a silicate rock or magma and a carbonate rock. more like this
source Fettes and Desmons, 2007, p195 more like this
type
Resource
Concept
broader metasomatic rock
in scheme simplelithology
siltstone
alt label
Silt bearing mudstone more like this
definition Mudstone that contains detectable silt. (see comments) more like this
example siltstone more like this
note Use of 'dectable silt' in the criteria for this category is based on the observation that in practice, distinction of claystone from 'siltstone' is typically based on a qualitative assessment of 'grittiness' (e.g. rubbing with fingers, or chewing); the property that these tests can determine is the presence or absence of silty particles in the material. Quantitative grain size analysis in the the clay/silt fraction of a lithified sediment is difficult at best, and of questionable significance because diagensis has altered the size and mineralogy of original sedimentary particles. more like this
source This vocabulary more like this
type
Resource
Concept
broader clastic mudstone
narrower
shale
siltstone
in scheme simplelithology
silt
alt label
loess more like this
definition Mud that consists of greater than 50 percent silt-size grains. more like this
source based on SLTTs 2004; Neuendorf et al. 2005; particle size from Wentworth grade scale more like this
type
Resource
Concept
broader mud
narrower silt
in scheme simplelithology
siliceous ooze
broader non clastic siliceous sediment
broader sediment
narrower siliceous ooze
ooze
narrower siliceous ooze
silicate mud
definition ooze that consists of more than 50 percent siliceous skeletal remains more like this
source This vocabulary more like this
type
Resource
Concept
in scheme simplelithology
silicate mudstone
definition Mudstone that contains less than 10 percent carbonate minerals. more like this
note Operational distinction of this category will typically be based on whether or not the rock fizzes when hydrochloric acid is applied--the rock is silicate mudstone if it does not fizz. The quantitative '10 percent' criteria is fuzzy. more like this
source This vocabulary more like this
type
Resource
Concept
broader generic mudstone
broader sedimentary rock
narrower silicate mudstone
in scheme simplelithology
silicate mud
definition Mud size sediment that consists of less than 50 percent carbonate minerals. more like this
source This vocabulary more like this
type
Resource
Concept
broader mud size sediment
broader sediment
narrower silicate mud
in scheme simplelithology
narrower siliceous ooze
shale
definition Laminated mudstone that will part or break along thin, closely spaced layers parallel to stratification. more like this
note Note definition does not specify carbonate vs. siliclastic nature of mud. more like this
source NADM SLTT sedimentary, 2004 more like this
type
Resource
Concept
broader clastic mudstone
in scheme simplelithology
serpentinite
definition Rock consisting of more than 75 percent serpentine-group minerals, eg. antigorite, chrysotile or lizardite; accessory chlorite, talc and magnetite may be present; derived from hydration of ferromagnesian silicate minerals such as olivine and pyroxene. more like this
source Neuendorf et al. 2005 more like this
type
Resource
Concept
broader metamorphic rock
narrower
quartzite
serpentinite
in scheme simplelithology
sedimentary rock
broader
rock
sedimentary material
definition Rock formed by accumulation and cementation of solid fragmental material deposited by air, water or ice, or as a result of other natural agents, such as precipitation from solution, the accumulation of organic material, or from biogenic processes, including secretion by organisms. Includes epiclastic deposits. more like this
narrower carbonate sedimentary rock
broader sedimentary rock
clastic sedimentary rock
generic conglomerate
broader sedimentary rock
generic mudstone
generic sandstone
broader sedimentary rock
narrower clastic sandstone
hybrid sedimentary rock
broader sedimentary rock
iron rich sedimentary rock
broader sedimentary rock
non clastic siliceous sedimentary rock
broader sedimentary rock
organic rich sedimentary rock
broader sedimentary rock
phosphorite
broader sedimentary rock
source SLTTs 2004 more like this
type
Resource
Concept
in scheme simplelithology
sedimentary material
definition Material formed by accumulation of solid fragmental material deposited by air, water or ice, or material that accumulated by other natural agents such as chemical precipitation from solution or secretion by organisms. Includes both sediment and sedimentary rock. Includes epiclastic deposits. All stated composition criteria are based on the mineral/ compound material (GeoSciML term)/particulate fraction of the material, irrespective of porosity or the pore-fluid. No distinctions are made based on porosity or pore fluid composition (except organic rich sediment in which liquid hydrocarbon content may be considered). more like this
narrower carbonate sedimentary material
broader sedimentary material
chemical sedimentary material
clastic sedimentary material
broader sedimentary material
non clastic siliceous sedimentary material
broader sedimentary material
organic rich sedimentary material
broader sedimentary material
phosphate rich sedimentary material
broader sedimentary material
sediment
sedimentary rock
source SLTTs 2004 more like this
type
Resource
Concept
broader compound material
in scheme simplelithology
sediment
broader
natural unconsolidated material
sedimentary material
definition Unconsolidated material consisting of an aggregation of particles transported or deposited by air, water or ice, or that accumulated by other natural agents, such as chemical precipitation, and that forms in layers on the Earth's surface. Includes epiclastic deposits. more like this
narrower biogenic sediment
broader sediment
carbonate sediment
broader sediment
clastic sediment
broader sediment
narrower sand
gravel size sediment
broader sediment
hybrid sediment
broader sediment
iron rich sediment
broader sediment
mud size sediment
non clastic siliceous sediment
phosphate rich sediment
broader sediment
sand size sediment
source SLTTs 2004 more like this
type
Resource
Concept
in scheme simplelithology
schist
definition Foliated phaneritic metamorphic rock with well developed, continuous schistosity, meaning that greater than 50 percent of the rock by volume is mineral grains with a thin tabular, lamellar, or acicular prismatic crystallographic habit that are oriented in a continuous planar or linear fabric. more like this
source SLTTm 2004; Neuendorf et al. 2005 more like this
type
Resource
Concept
broader foliated metamorphic rock
in scheme simplelithology
narrower mica schist
broader schist
sapropel
definition Jelly like organic rich sediment composed of plant remains, usually algal. Liptinite to Inertinite ratio is greater than one (Economic commission for Europe, committee on Sustainable Energy- United Nations (ECE-UN), 1998, International Classification of in-Seam Coals: Energy 19, 41 pp.) more like this
source Neuendorf et al. 2005 more like this
type
Resource
Concept
broader organic rich sediment
narrower sapropel
in scheme simplelithology
sandstone
alt label
clastic sandstone more like this
sandy rock more like this
broader
clastic sedimentary rock
generic sandstone
definition Clastic sedimentary rock in which less than 30 percent of particles are greater than 2 mm in diameter (gravel) and the sand to mud ratio is at least 1. more like this
narrower arenite
broader clastic sandstone
wacke
note Note this category is equivalent to cagetory labeled 'sandy rock' in SLTTs (2004), not to the much more restricted category labeled 'Sandstone' in that system. more like this
source SLTTs 2004; Neuendorf et al. 2005; particle size from Wentworth grade scale more like this
type
Resource
Concept
in scheme simplelithology
sand size sediment
definition Sediment in which less than 30 percent of particles are gravel (greater than 2 mm in diameter) and the sand to mud ratio is at least 1. composition or genesis of clasts not specified. more like this
source Neuendorf et al. 2005 ; particle sizes defined from Krumbein phi scale (W C Krumbein and L L Sloss, Stratigraphy and Sedimentation, 2nd edition, Freeman, San Francisco, 1963; Krumbein and Pettijohn, 1938, Manual of Sedimentary Petrography: New York, Appleton Century Co., Inc.) more like this
type
Resource
Concept
broader sediment
in scheme simplelithology
narrower sand
sand
broader
clastic sediment
sand size sediment
definition Clastic sediment in which less than 30 percent of particles are gravel (greater than 2 mm in diameter) and the sand to mud ratio is at least 1. More than half of the particles are of epiclastic origin. more like this
source definition of sand from SLTTs 2004 sandy sediment; particle sizes defined from Krumbein phi scale (W C Krumbein and L L Sloss, Stratigraphy and Sedimentation, 2nd edition, Freeman, San Francisco, 1963; Krumbein and Pettijohn, 1938, Manual of Sedimentary Petrography: New York, Appleton Century Co., Inc.) more like this
type
Resource
Concept
in scheme simplelithology
rock salt
definition Evaporite composed of at least 50 percent halite. more like this
source This vocabulary more like this
type
Resource
Concept
broader evaporite
narrower rock salt
in scheme simplelithology
rock
definition Consolidated aggregate of one or more EarthMaterials, or a body of undifferentiated mineral matter, or of solid organic material. Includes mineral aggregates such as granite, shale, marble; glassy matter such as obsidian; and organic material such a coal. Excludes unconsolidated materials. more like this
narrower aphanite
broader rock
composite genesis rock
broader rock
igneous rock
sedimentary rock
tuffite
source Jackson, 1997; NADM C1 2004; Neuendorf et al 2005 more like this
type
Resource
Concept
broader compound material
in scheme simplelithology
rhyolitoid
alt label
rhyolitic rock more like this
broader acidic igneous rock
narrower
quartz rich igneous rock
rhyolitoid
fine grained igneous rock
definition fine_grained_igneous_rock consisting of quartz and alkali feldspar, with minor plagioclase and biotite, in a microcrystalline, cryptocrystalline or glassy groundmass. Flow texture is common. Includes rocks defined modally in QAPF fields 2 and 3 or chemically in TAS Field R as rhyolite. QAPF normative definition is based on modal mineralogy thus: less than 90 percent mafic minerals, between 20 and 60 percent quartz in the QAPF fraction, and ratio of plagioclse to total feldspar is less than 0.65. more like this
narrower alkali feldspar rhyolite
broader rhyolitoid
rhyolite
note Note that technical definition, based on modal mineralogy plotted in a QAPF triangle may be applied qualitatively, based on phenocryst mineralogy when ground mass mineralogy can not be determined optically, or based on CIPW norm. Although TAS categories are defined based on chemical analyses, the correspondence with the QAPF defined categories is generally close enough that QAPF categories are commonly used interchangeably with TAS categories. It is important to note the basis for assignment of fine-grained igneous rocks to a specifice lithology category. more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
in scheme simplelithology
rhyolite
definition rhyolitoid in which the ratio of plagioclase to total feldspar is between 0.1 and 0.65. more like this
example
liparite more like this
rhyodacite more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader rhyolitoid
in scheme simplelithology
residual material
definition Material of composite origin resulting from weathering processes at the Earth's surface, with genesis dominated by removal of chemical constituents by aqueous leaching. Miinor clastic, chemical, or organic input may also contribute. Consolidation state is not inherent in definition, but typically material is unconsolidated or weakly consolidated. more like this
source This vocabulary more like this
type
Resource
Concept
broader material formed in surficial environment
narrower residual material
in scheme simplelithology
quartzite
definition Metamorphic rock consisting of greater than or equal to 75 percent quartz; typically granoblastic texture. more like this
example itacolumite more like this
source after Neuendorf et al. 2005 more like this
type
Resource
Concept
broader metamorphic rock
in scheme simplelithology
quartz trachyte
definition Trachytic rock that contains between 5 and 20 percent quartz in the QAPF fraction. QAPF field 7*. more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader trachytic rock
in scheme simplelithology
quartz syenite
definition Syenitic rock that contains between 5 and 20 percent quartz in the QAPF fraction. Defined modally in QAPF Field 7*. more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader syenitic rock
in scheme simplelithology
quartz rich igneous rock
broader
acidic igneous rock
phaneritic igneous rock
definition Phaneritic crystalline igneous rock that contains less than 90 percent mafic minerals and contains greater than 60 percent quartz in the QAPF fraction. more like this
example
quartz-rich granitoid more like this
quartzolite more like this
note Occurrence of igneous rocks meeting this criteria seems to be vanishingly rare, thus subdividing the category does not seem warranted for the purposes of This vocabulary. Future usage of the vocabulary may motivate including quatzolite and quartz-rich granitoid in future revisions more like this
source Gillespie and Styles 1999; LeMaitre et al. 2002 more like this
type
Resource
Concept
in scheme simplelithology
quartz monzonite
definition Monzonitic rock that contains 5-20 percent quartz iin the QAPF fraction. Includes rocks defined modally in QAPF Field 8*. more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader monzonitic rock
in scheme simplelithology
quartz monzogabbro
definition Monzogabbroic rock that contains between 5 and 20 percent quartz in the QAPF fraction. QAPF field 9*. more like this
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader monzogabbroic rock
narrower quartz monzogabbro
in scheme simplelithology