Compactional Diagenesis

Chilingarian, George V.

doi:10.1007/978-94-009-7259-9_2

Cited by 21 publications

(14 citation statements)

References 48 publications

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“…Pressure solution is a possible mechanism for the generation of silica cement from the interbedded mudstones [12,13]. Pressure dissolution of silica is minor in the upper 1500 m of the sediments, but increases in a roughly linear manner with depth [14]. Quartz-rich mudstones and siltstones that have undergone pressure dissolution may be possible sources for the generation of silica cement in the sandstone-rich section of the basin.…”

Section: Discussion and Interpretationmentioning

confidence: 99%

Diagenesis and Mass Transfer Between Permo-Triassic Sandstones and Interbedded Mudstones, Ulster Basin

Ahmed

2002

Bull. Chem. Soc. Eth.

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ABSTRACT. Beds of siltstone, mudstone and shale are interbedded in the Permo-Triassic sandstones of the Ulster Basin, UK, at different stratigraphic levels. The paragenetic sequences of authigenic minerals both in the sandy and fine-grained sediments (mudstones and siltstones) indicate red bed diagenetic trend. Abundant authigenic quartz overgrowths and carbonate crystals observed near the sandstone-siltstone and sandstone-mudstone contacts, indicating that pore water and mass transfer from the fine-grained sediments to sandstone facies. The fine-grained sediments are the main source of ions for the authigenesis of quartz and feldspar overgrowths and carbonate precipitation. Mechanical compaction of fine-grained sediments, influx of gravity-driven acidic meteoric pore water, dehydration water, diffusion and convection are the most important means of mass transfer and pore water circulation. Pore water migration depends upon permeability distribution and pressure difference.

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Section: Discussion and Interpretationmentioning

confidence: 99%

Diagenesis and Mass Transfer Between Permo-Triassic Sandstones and Interbedded Mudstones, Ulster Basin

Ahmed

2002

Bull. Chem. Soc. Eth.

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“…All known primary ore in the Grants uranium region lies under the mudflat facies of the Brushy Basin Member (Fishman and others, 1984). The downward movement of alkaline, humic-acidbearing pore fluids was driven by compaction and salinity gradients, a common phenomenon where fine-grained lacustrine sediments overlie permeable strata (Chilingarian, 1983) and which has been modeled in modern lakes by Winter (1981). This hypothesis is supported by Fe-Ti-oxide alteration patterns in the upper part of the Westwater Canyon Member in the ML-LV cores (Reynolds and others, 1986) Grants uranium region (Adams and others, 1974).…”

Section: Origin Of Epigenetic Amorphous Organic Mattermentioning

confidence: 92%

Uranium ore in the Mariano Lake-Lake Valley cores and the genesis of coffinite in the Grants uranium region, New Mexico

Hansley¹

1988

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“…Mudrocks buried to a depth of 3.4 km are compacted to between 5 % and 10 % porosity (from an initial 70-90 % porosity). Burial to a depth of 7.3 km will result in compaction to less than 3 % porosity (Chilingarian, 1983). Therefore differential compaction is a possible explanation for the thickness variation between the two sections.…”

Section: Cause Of the Thickness Variation Between Spengill And Stockdmentioning

confidence: 99%

The use of magnetic susceptibility and trace element geochemistry for the correlation of fine-grained siliciclastic sequences: a Late Llandovery example from northwest England

English

1999

Geol. Mag.

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High-resolution lithological and magnetic susceptibility logs were made of two sections of the Upper Llandovery Browgill Formation in northwest England: Stockdale Beck, the type section of the Browgill Formation, and Spengill. The Browgill Formation is composed of fine-grained deep marine siliciclastics, which can be divided broadly into two facies: a homogeneous grey mudstone, deposited under oxygenated bottom-water conditions, and subordinate beds of laminated, graptolitebearing black mudstone deposited under low bottom-water oxygen levels. The latter facies is often partially or fully diagenetically altered to chlorite nodules, occasionally with manganese carbonate nucleii. Magnetic susceptibility logs are shown to reflect variations in the illite-chlorite ratio of the clay mineralogy. Chlorite is a paramagnetic mineral, so the bands of chlorite nodules produce magnetic susceptibility highs. Correlation demonstrates that diagenetically altered beds of laminated black mudstone are continuous between the two sections, now situated 32 km apart. This lateral continuity would favour pelagic fallout in preference to gravity flow as a depositional model for both facies. A correlated sequence within the turriculatus Biozone is 3.8 times thicker at Spengill than at Stockdale Beck, probably reflecting variations in sediment accumulation rates. Correlation also identifies significant non-sequences in both sections: at least 47 % of the turriculatus Biozone (including maximus Subbiozone) is missing at Stockdale Beck and at least 77 % of the crispus Biozone is missing at Spengill. The identification of non-sequences may be of value for refining graptolite biostratigraphy.

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Compactional Diagenesis

Cited by 21 publications

References 48 publications

Diagenesis and Mass Transfer Between Permo-Triassic Sandstones and Interbedded Mudstones, Ulster Basin

Diagenesis and Mass Transfer Between Permo-Triassic Sandstones and Interbedded Mudstones, Ulster Basin

Uranium ore in the Mariano Lake-Lake Valley cores and the genesis of coffinite in the Grants uranium region, New Mexico

The use of magnetic susceptibility and trace element geochemistry for the correlation of fine-grained siliciclastic sequences: a Late Llandovery example from northwest England

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