Clay Petrology of Mudstones, Leg 18, Deep Sea Drilling Project

Hayes, John B.

doi:10.2973/dsdp.proc.18.128.1973

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…This result is consistent with the very high smectite content measured in the pelagic clay near the base of Site 178, ∼1.5 km from Site U1417 (Figure ). The fraction of illite in the mixed‐layer clays of the lowermost samples is similar to that of the overlying sediment [ Hayes , ; reported as percent of mica‐like layers]. Modeling results suggest that significant opal‐A reaction occurs ∼300 to 400 mbsf.…”

Section: Application Of the Code To The Gulf Of Alaskamentioning

confidence: 52%

“…Smectite content was estimated from X‐ray diffraction (XRD) analyses by Hayes [] and sample analyses from IODP Site U1417 [ Screaton et al ., ]. Hayes [] reported that smectite mole fraction in mixed‐layer clays is variable in the incoming sediment section, ranging from 0.5 to 0.8 at Site 178. Results were reported as smectite wt.…”

Section: Application Of the Code To The Gulf Of Alaskamentioning

confidence: 99%

“… Results of sample analyses . ( a) Volume percent smectite from Site 178 [ Hayes , ] in red triangles and smectite (purple squares) and biogenic silica (blue circles) from Site U1417. (b) Sample permeability (circles) plotted as a function of porosity and Daigle and Screaton [] k‐n relationships (lines).…”

Section: Application Of the Code To The Gulf Of Alaskamentioning

confidence: 99%

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The impact of rapid sediment accumulation on pore pressure development and dehydration reactions during shallow subduction in the Gulf of Alaska

Meridth

Screaton

Jaeger

et al. 2017

Geochem Geophys Geosyst

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In the Gulf of Alaska region, sediment has rapidly accumulated (>1 km/my) in the trench sourced from intensified glaciation in the past $1.2 million years. This rapid sediment accumulation increases overburden and should accelerate dehydration of hydrous minerals by insulating the underlying sediment column. These processes have the potential to generate fluid overpressures in the low permeability sediments entering the subduction zone. A 1-D model was developed to simulate dehydration reaction progress and investigate excess pore pressures as sediments approach the trench and are subducted. At the deformation front, simulated temperatures increase by $308C due to the insulating effect of trench sediments. As a result, opal-A begins to react to form quartz while smectite remains mostly unreacted. Loading due to the trench sediments elevates excess pore pressures to $30% of lithostatic pressure at the deformation front; however, deformation front excess pore pressures are sensitive to assumptions about the permeability of outer wedge sediments. If the outer wedge sediments are coarse-grained and high-permeability rather than mud-dominated, excess pore pressures are lower but still have an insulating effect. During early subduction, simulated pore pressures continue to rise and reach $70% of lithostatic by 60 km landward. The 1-D modeling results suggest that the elevated pore pressures are primarily due to loading and that dehydration reactions are not a significant component of excess pore pressure generation at this margin.

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Section: Application Of the Code To The Gulf Of Alaskamentioning

confidence: 52%

Section: Application Of the Code To The Gulf Of Alaskamentioning

confidence: 99%

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The impact of rapid sediment accumulation on pore pressure development and dehydration reactions during shallow subduction in the Gulf of Alaska

Meridth

Screaton

Jaeger

et al. 2017

Geochem Geophys Geosyst

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“…Reynolds and Hower (1970) have shown that pure montmorillonite as well as irregular mixed-layer illite/ montmorillonite containing as much as 60 percent illite layers have a 17Å peak. Although DSDP X-ray data sheets list the mineral with this behavior as montmorillonite, it should be called 17Å irregular mixed-layer illite/montmorillonite as suggested by Hayes (1973). The amount of expandable layers is determined by the spacing of the 002 illite/003 montmorillonite peak (Reynolds and Hower, 1970).…”

Section: Identification Of Clay Mineralsmentioning

confidence: 99%

Burial Diagenesis of Pelitic and Carbonate Deep-Sea Sediments from the Arabian Sea

Matter¹

1974

Initial Reports of the Deep Sea Drilling Project

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“…As shown by Matter (1974) and Hayes (1973), this mineral should be called a 17Å irregular mixed layer illite/montmorillonite. Because the amount of expandable layers could not be determined, this mineral is included in the smectite calculation.…”

Section: Allochthonous Constituentsmentioning

confidence: 99%

Mineralogy and Lithofacies of Black Sea Sediments, Leg 42B Deep Sea Drilling Project

Stoffers¹,

Müller²

1978

Initial Reports of the Deep Sea Drilling Project

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In general, three types of sediments were encountered in the three sites drilled during Leg 42B in the Black Sea: terrigenous, chemical (calcite, high-magnesian calcite, aragonite, dolomite, siderite), and biogenic (mainly diatomaceous). Terrigenous muds predominate in the Pleistocene whereas chemical sediments are abundant in the lower Pleistocene and Pliocene sediments. Biogenic constituents play a minor role only. Five different lithofacies could be recognized which are related to the changing environmental conditions in the Black Sea. The facies are: terrigenous muds, Seekreide, sapropelic diatomaceous clay, siltstone with dolostone intercalations, and siltstone. In many intervals a cyclic sedimentation of carbonate-free sapropelic sediments and carbonate layers were noted which is explained by an oscillating density boundary with anoxic conditions and the dissolution of carbonates below the interface. Stratification is often caused by the influx of marine waters into a fresh water Black Sea. The changes in the Mg/Ca ratio of the Black Sea water determine the carbonate mineralogy. Dolomitized crusts, oolites, algae mats, intraclasts, and pellets found in the Pliocene sediments suggest deposition in a shallow marine to supratidal environment with subsequent diagenetic alteration under meteoric conditions. The Pleistocene sediments are basically influenced by the climatic fluctuations related to glacial and interglacial periods. A distinct shift in the importance of the different source areas is noted. The late Miocene-Pliocene to lower Pleistocene sediments characterized by abundant smectite are mainly derived from the south (Turkey) whereas the increased amount of illite and detrital dolomite which occur in the Pleistocene sediment sequence indicate sediment transport mainly from the north (Danube).

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Clay Petrology of Mudstones, Leg 18, Deep Sea Drilling Project

Cited by 6 publications

References 9 publications

The impact of rapid sediment accumulation on pore pressure development and dehydration reactions during shallow subduction in the Gulf of Alaska

The impact of rapid sediment accumulation on pore pressure development and dehydration reactions during shallow subduction in the Gulf of Alaska

Burial Diagenesis of Pelitic and Carbonate Deep-Sea Sediments from the Arabian Sea

Mineralogy and Lithofacies of Black Sea Sediments, Leg 42B Deep Sea Drilling Project

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