Introduction to siliciclastic sandstones v2(2010)...Cretaceous Sites sandstone, Cache Ck, CA...
Transcript of Introduction to siliciclastic sandstones v2(2010)...Cretaceous Sites sandstone, Cache Ck, CA...
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Introduction to siliciclasticsandstones
Geosciences 443September 15, 2010
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Pettijohn, Potter, and Seiver, 1972
Cambrian qtz arenite, WI
Miocene arkose, So. CA
Eocene wacke, central CA
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Pettijohn, Potter, and Seiver, 1972
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Pettijohn, Potter, and Siever, 1972
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Pettijohn, Potter, and Siever, 1972
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Neogene Ridge Basin, CA
Lv in Holocene sand, Lake Malawi Cht and Lci in Permian Powwow congl., W TX
Tertiary Six Mile Creek Fm, Ruby Mtns, MT
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The matrix problem
Psuedomatrix – deformed LsCambrian Vaughan ss, W. Tx
Clay cementEocene Domengine ssVallecitos syncline, CA
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Major controls on sandstone composition
• Source composition (dependent on tectonic setting)• Modification during weathering (climate)• Modification during transport (sorting, compositional
stabilization)• Modification during burial (introduction of cements,
deletion of labile grains)
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Basu et al., 1975
Qm, Cambrian, WI
Qp, Miocene Orinda sandstone, E SF Bay
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Stable craton provenance
Cambrian qtz arenite, WI
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Continental Block provenance
Neogene Peeler ss,Ridge Basin, CA
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Continental Block provenance
Neogene Peeler sandstone, Ridge Basin, CA
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Recycled Orogen Provenance
Permian Powwow cngl, W TX
Miocene Orinda ss, East SF Bay
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Magmatic Arc Provenance
Cretaceous Sites sandstone,Cache Ck, CA
Holocene sand, Mono Lake, CA
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Major controls on sandstone composition
• Source composition (dependent on tectonic setting)• Modification during weathering (climate)• Modification during transport (sorting, compositional
stabilization)• Modification during burial (introduction of cements,
deletion of labile grains)
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Modification of sandstone composition by climate
Suttner and Dutta, 1986
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Suttner and Dutta, 1986
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Eocene Domengine sandstone, Vallecitos syncline, CA
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Major controls on sandstone composition
• Source composition (dependent on tectonic setting)• Modification during weathering (climate)• Modification during transport (sorting, compositional
stabilization)• Modification during burial (introduction of cements,
deletion of labile grains)
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Pettijohn, Potter, and Seiver, 1972
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Petrographic analysis of siliciclastic sandstones
Important considerations:1) Fabric of sample – spatial relationships among several grains
Examples: grain vs. matrix support; nature of grain contacts (point contact, concavo-convex; long contact; sutured contact; overgrowths)
2) Texture of grains – size, shape relations of grainssorting, rounding, sphericityConcept of textural inversion = textural anomaly
well-rounded sand grains floating in silt or clay matrixextremely well-sorted but very angular grainsfiner grains better rounded than coarser grains
3) Composition of framework grains: more on this later4) Composition and nature of interstitial material: diagenetic contributions
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Major terrigenous constituents
• Detrital constituents: quartz, feldspar, chert, accessories, lithicgrains; biogenic components (may not be derived from outside basin of deposition)
• Chemical consituents: cements– Carbonate and silica– Sulfate, halite, clay
• Authigenic grains: minerals forming in situ during diagenesis (note: these can be reworked as detrital components).– Feldspars– Hematite– Glauconite– zeolites
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QuartzQuartz types• Plain and monocrystalline – volcanic• Polycrystalline and undulose – metamorphic rocks• Undulose with abundant inclusions and bubbles – plutonic• Unstrained polycrystalline – vein quartz• Very finely crystalline quartz – chert (salt and pepper appearance in
xp)• Fan-like quartz with radial extinction – chalcedony• Isotropic opal may rarely form cement in very young sandstones
Other considerations• Elongate, lineated quartz – probably metamorphic• Monocrystalline quartz more common in mature sandstones• Polycrystalline quartz more common in immature sandstones• Embayed quartz common in shallow intrusives and volcanic rocks –
phenocryst formed early moves to lower P,T conditions and becomes unstable
• Fluid inclusions more common in plutonic rocks; may form in lines
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Quartz overgrowths
• Chemical addition of quartz onto original detrital grain• Very common cement type• Samples typically ‘sparkle’ in sunshine• Overgrowth may be strained as is detrital grain• Overgrowths may become abraided if sandstone is weathered and
individual grains (+ overgrowth) are reworked. Good evidence ofsedimentary recycling.
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Feldspars• K-spars include: orthoclase, microcline, anorthoclase, sanidine, adularia
(low T, diagenetic)• Plagioclase solid solution series from albite (An0) to anorthite (An100)• Perthite is a mixed (intergrown) plagioclase in a K-spar host• Antiperthite is Kspar in plag host• Graphic granite and myrmekitic texture: quartz blebs in Kspar crystal –
indicators of a plutonic source• metamorphic and igneous feldspars both common – look for mineralogic
or lithologic associations such as garnet, metamorphic rock fragments• Feldspar is less durable than quartz – perfect three-directions of
cleavage• Feldspar commonly resides in finer grain size fraction because of
cleavage• K-spars more common than plagioclase in early Pz sandstones –
(function of chemical weathering environment prior to land plantevolution?)
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Lithic fragments
• Provide clearest and most direct provenance indicators• Fine-grained and may be difficult to interpret (e.g., chert may be
sedimentary or devitrified volcanic glass)• Factors influencing presence and type of lithic fragments:
– Source type– Distance from source (e.g., schist fragments restricted to close to
source)– Generally more prevalent in coarser fractions– Durability influenced by climate– Some are highly susceptible to weathering and diagenesis (e.g.,
volcanic lithics)– Intraclasts derived from within basin
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Volcaniclastic rocks
• Very important volumetrically, especially in orogenic belts• Eruption type related to composition: explosive = silicic; ‘quiet’
eruptions = more mafic.• Volcaniclastic – may be air or water lain; later reworked at surface.
When is volcanic tuff a sedimentary tuff?• Tephra – fragmented volcanic material, usually glass-rich• Useful to recognize three tuff end members: vitric, crystal, lithic
– Vitric tuffs: texture most characteristic; pumice fragments, shard structures; flow banding; devitrification or alteration of glass during diagenesis can result in formation of zeolites, clays, celadonite (green), or palagonite (brown) and release of large volumes of silica
– Crystal tuffs: crystals can be most any volcanic mineral– Lithic tuffs: variety of lithic fragments can be incorporated into
rock, either during eruption or during subsequent reworking of volcanic sand.
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Saint Peter sandstoneOrdovician, southern WI
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Permian Powwow cngl, W TX
Miocene Orinda ss, East SF Bay
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Holocene sand, Mono Lake, CA
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Granitic rock fragment
Lv in Holocene sand, Lake Malawi