Analcime in lake and lake‐margin sediments of the Carboniferous Rocky Brook Formation, Western Newfoundland, Canada

Gall, Q; Hyde, Richard S.

doi:10.1111/j.1365-3091.1989.tb01751.x

Cited by 30 publications

(14 citation statements)

References 19 publications

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“…The recognition of zeolites in pores confirms that they formed from solution rather than by direct transformation of clay minerals in the groundmass (Remy & Ferrell, 1989;Renaut, 1993); the latter has been suggested for some analcime occur rences observed in thin setions (e.g. However, analcime coatings in root passages in Carboniferous lake margin deposits seem to have formed after burial rather than during soil development (Gall & Hyde, 1989). Occurrences in pores that formed during subaerial exposure, particularly channels, generally indicate a pedogenic nature of the zeolites (Haesaerts et al, 1983;Renaut, 1993;Ashley & Driese, 2000;Yakimenko et al, 2004).…”

Section: Thin Section Studiessupporting

confidence: 53%

Authigenic Silicate Minerals – Sepiolite-Palygorskite, Zeolites and Sodium Silicates

Mees

2010

Interpretation of Micromorphological Features of Soils and Regoliths

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Section: Thin Section Studiessupporting

confidence: 53%

Authigenic Silicate Minerals – Sepiolite-Palygorskite, Zeolites and Sodium Silicates

Mees

2010

Interpretation of Micromorphological Features of Soils and Regoliths

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“…While volcanic glass is the most frequent precursor of zeolites in saline-alkaline lakes (Surdam and Sheppard, 1978;Boles and Surdam, 1979), these minerals can also form at the expense of other materials, such as clay minerals, feldspars, and feldspathoids (Hay and Sheppard, 2001). Analcime in particular has been recorded in several cases in lacustrine sediments free of associated volcaniclastic material (Hay, 1966;Gall and Hyde, 1989;Remy and Ferrell, 1989;Renaut, 1993;English, 2001).…”

Section: Analcime Authigenesismentioning

confidence: 97%

“…9b). The coexistence of smectite and analcime has been documented, for example, in the Rocky Brook Formation of Western Newfoundland, Canada (Gall and Hyde, 1989). Lake Natron, Tanzania, probably represents a close modern analogue of the Maíz Gordo Formation, as this alkaline lake (pH N 9.5) is devoid of potential precursor volcanogenic material and no zeolites other than analcime were identified (Hay, 1966).…”

Section: Analcime Authigenesismentioning

confidence: 97%

Clay mineral assemblages and analcime formation in a Palaeogene fluvial–lacustrine sequence (Maíz Gordo Formation Palaeogen) from northwestern Argentina

Campo

Papa

Jiménez-Millán

et al. 2007

Sedimentary Geology

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The Palaeogene Maíz Gordo Formation is one of the main lacustrine events recorded in northwestern Argentina. It consists of sandstone, mudstone, and limestone beds 200 m thick, deposited in a brackish-alkaline lake and braided alluvial systems. The Maíz Gordo Lake evolved mainly as a closed system, with brief periods as an open one. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study samples from seven sites, corresponding respectively to proximal, intermediate, and transitional positions of the fluvial environment and marginal and inner-lake environment, focusing on the clay mineralogy and analcime formation. The basinward zonation of diagenetic minerals identified in the Maíz Gordo Lake was: mordenite → analcime → K-feldspar. Although not a typical zonation of saline-alkaline lakes, it does indicate an increase in salinity and alkalinity towards the centre.In proximal fluvial settings, smectite predominates at the base of the sequence, with scarce kaolinite. Towards the top, a striking increase in kaolinite content suggests a change from a relatively arid climate with alternating humid and dry seasons, towards a warm and humid climate. Kaolinite content clearly decreases in a basinward direction. Such a variation is attributable to changes in hydro-geochemistry, denoting the progressive influence of the brackish and alkaline lake water on interstitial pores. SEM images of intermediate fluvial samples reveal authigenesis of illite at the expense of kaolinite booklets.In littoral and inner-lake settings the clay fraction is composed of muscovite, sometimes with subordinate smectite. Analcime occurs in variable amounts in all sedimentary facies, in rock pores or filling veins. It forms subhedral square to hexagonal, or anhedral rounded crystals, denoting that they coarsened at low to moderate degrees of supersaturation. Although the mordenite identified in a fluvial level would have been the precursor of analcime in the Maíz Gordo Basin, no textural evidence of analcime formation through replacement of mordenite or other precursor zeolite was found. Hence it is more probable that analcime formation took place by direct authigenic precipitation or through the reaction between interstitial brines and clay minerals or plagioclase.

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“…This relatively recent example provides a partial analogue for several ancient lake marginal zeolite occurrences in the geological record (e.g. Hay, 1970;Gall & Hyde, 1989;Remy & Ferrell, 1989). All analyses expressed in mg 1-', except alkalinity (HC03 +CO,) for GW l(*), expressed in meq 1-'.…”

Section: Introductionmentioning

confidence: 96%

Zeolitic diagenesis of late Quaternary fluviolacustrine sediments and associated calcrete formation in the Lake Bogoria Basin, Kenya Rift Valley

Renaut

1993

Sedimentology

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Late Quaternary fluviolacustrine siltstones, mudstones and claystones (Loboi Silts) on the northern margins of the saline, alkaline Lake Bogoria in the Kenya Rift Valley contain up to c. 40% authigenic analcime and minor natrolite. The zeolitic sediments are reddish brown and up to 1 m thick. The amount of analcime increases upward in the profile, but decreases with distance from the lake. The altered sediments show many pedogenic features including zeolitic root mats, rootmarks, concretions and carbonate rhizoliths. Residual patches of calcrete locally cap the zeolitic rocks. The profile is interpreted as an exhumed palaeosol and land surface on the former margins of the lake. The analcime occurs as submicroscopic (0–5–2–5 μ.m) subhedral and euhedral crystals, which have an average Si/A 1 ratio of 2–33 (as determined by X‐ray microanalysis) or 2–18 (d‐value of 639 analcime peak). The analcime formed in lake marginal sediments (soils) by reaction of silicate detritus with Na2CO3 rich pore waters concentrated close to the land surface by evaporative pumping and evapotranspiration. Poorly ordered clay minerals were probably the main reactants. Authigenic illite may have been a by‐product of the reactions. Chemical analyses suggest that pore waters supplied some of Na+, and possibly K+ and SiO2. The associated calcrete and rhizoliths were formed during or shortly after the main period of zeolitic alteration. The Ca2+ may have originated from infiltrating dilute runoff and groundwater. Authigenic smectite was precipitated in open porosity following analcime formation. The zeolitic alteration at Lake Bogoria provides a relatively recent analogue for lake marginal zeolites found in many ancient saline, alkaline lake sediments.

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Analcime in lake and lake‐margin sediments of the Carboniferous Rocky Brook Formation, Western Newfoundland, Canada

Cited by 30 publications

References 19 publications

Authigenic Silicate Minerals – Sepiolite-Palygorskite, Zeolites and Sodium Silicates

Authigenic Silicate Minerals – Sepiolite-Palygorskite, Zeolites and Sodium Silicates

Clay mineral assemblages and analcime formation in a Palaeogene fluvial–lacustrine sequence (Maíz Gordo Formation Palaeogen) from northwestern Argentina

Zeolitic diagenesis of late Quaternary fluviolacustrine sediments and associated calcrete formation in the Lake Bogoria Basin, Kenya Rift Valley

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