Some geochemical aspects of sedimentary rocks in proximity of coals, sydney coalfield (upper carboniferous), cape breton island, nova scotia, canada

Zodrow, Erwin L.

doi:10.1016/0166-5162(83)90015-0

Cited by 11 publications

(8 citation statements)

References 18 publications

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“…1C. The rocks are classified as grey, silty shale, moderately fissile, with interspersed thin sideritic bands and smaller nodules (see Zodrow 1983). Associated medium-grained muscovitic sandstone also contained some foliar remains.…”

Section: Methodsmentioning

confidence: 99%

“…The specimens are still in good condition because of the absence of destructive pyritic oxidation (Zodrow 2005). However, the coalified layer of 186 has deteriorated slightly because of localized clayey or sideritic oxidation (Zodrow 1983) in the rock matrix (the obverse is pristine). The specimens also include associated Macroneuropteris scheuchzeri (Hoffmann) Cleal et al, Lobatopteris vestita auct.…”

Section: The Types Of Linopteris Obliquamentioning

confidence: 99%

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The arborescent Linopteris obliqua plant (Medullosales, Pennsylvanian)

Zodrow¹,

Tenchov²,

Cleal³

2007

Bull. Geosci.

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The foliar morphospecies Linopteris obliqua (Bunbury) Zeiller, 1899 was originally based on isolated pinnules from Middle Pennsylvanian (upper Westphalian) strata in the Sydney Coalfield in Nova Scotia, Canada. However, new finds from the type area, including segments of a cauline axis and some fronds, attached juvenile croziers, an attached ovule, and associated pre-pollen organ, allow for a more complete understanding of the whole Linopteris obliqua plant. It was arborescent, 9 m to 10 m tall, with fronds ca 7 m long. Ovules of the Hexagonocarpus-type were attached directly to the petiole near the base of the frond, and pre-pollen was produced by Potoniea-type structures. The plant produced seeds and pollen at different times to avoid self-pollination. Ovule production was periodic and accompanied by mass pinnule abscission. The venation, especially the areolate-vein geometry, is relatively invariable within the plant species, and thus provides the typus (blueprint) for distinguishing other linopterid species, especially when combined with two-dimensional probability surfaces, and traditional pinnule morphology. However, the venation must be viewed on the abaxial surface of the pinnules if it is to be reliably interpreted. The mode of vein reticulation is shown to be quite distinct from the anastomosis-pattern seen in the other medullosalean taxa, and is another character that separates the Potonieaceae from the rest of the order

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Section: Methodsmentioning

confidence: 99%

Section: The Types Of Linopteris Obliquamentioning

confidence: 99%

The arborescent Linopteris obliqua plant (Medullosales, Pennsylvanian)

Zodrow¹,

Tenchov²,

Cleal³

2007

Bull. Geosci.

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“…In effect, the factor probably represents fluvial sedimentary influxes (Hildalgo, 1969;Cheek and Donaldson, 1969;Staub and Cohen, 1979;McCabe, 1987) and is named the Clay Factor. Independent work (Zodrow, 1983) shows that uranium concentration varies directly with clay content and that uranium and thorium concentrations in coal samples are relatable to sedimentary processes (Zodrow et al, 1987), supporting the interpreted identity of the factor. Factor 1 is inferentially linked with the process 1 (Table 12).…”

Section: The Oblique Factors and Their Coal-geological Identitiesmentioning

confidence: 75%

“…The entries in the factor structure matrix (Table 11) represent the individual correlation between the oblique factor and its effect. The factor structure matrix is not only the key in fitting the factor model to the conceptual coal-sulfur model but it also contains statistically valuable infor mation for use in regression analysis, [refer to Eqs.4 and 5 and Zodrow (1970)], and it can be used to construct models for each of the remaining 30 effects (e.g., the coal-manganese model with only one underlying influence, Factor5).…”

Section: The Calculated Correlation and Structure Matricesmentioning

confidence: 99%

A coal-sulfur model for Sydney Coalfield (Upper Carboniferous), Nova Scotia, Canada

Zodrow¹

1991

atgeol

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Methods of modern factor analysis are applied to a set of 31 variables (metals, sulfur and ash) of coal data, with focus on explaining the sulfur variance in coal for the formulation of a coal-sulfur model. The derived five hypo thetical factors which are fitted to the conceptual coal-sulfur model are inferred to represent general sedimentary/ geochemical processes, except for one for which there is no available identity and no corresponding process in the conceptual model. The fluvial sedimentary influx and the pyrite-forming factors are the most influential in explaining the variation of sulfur in the coal, where the latter factors are linked with sulfur supplied from recycled sulfate solution. The factor interpretation is consistent with independent results that identify clay minerals and pyrite as the dominating coal mineralogy in the Sydney Coalfield.

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“…Stratigraphic section of the Mabou Sub-Basin is omitted but see Zodrow & Vasey (1986). study. These samples originated from the clay-rich roof rocks, Table 2 (see also Zodrow 1983) in the Sydney Mines Formation (Fig. 2), Sydney Coalfield (Cleal et al 2003).…”

Section: Methodsmentioning

confidence: 99%

A proposed origin for fossilized Pennsylvanian plant cuticles by pyrite oxidation (Sydney Coalfield, Nova Scotia, Canada)

Zodrow¹,

Mastalerz²

2009

Bull. Geosci.

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Fossilized cuticles, though rare in the roof rocks of coal seam in the younger part of the Pennsylvanian Sydney Coalfield, Nova Scotia, represent nearly all of the major plant groups. Selected for investigation, by methods of Fourier transform infrared spectroscopy (FTIR) and elemental analysis, are fossilized cuticles (FCs) and cuticles extracted from compressions by Schulze's process (CCs) of Alethopteris ambigua. These investigations are supplemented by FTIR analysis of FCs and CCs of Cordaites principalis, and a cuticle-fossilized medullosalean(?) axis. The purpose of this study is threefold: (1) to try to determine biochemical discriminators between FCs and CCs of the same species using semi-quantitative FTIR techniques; (2) to assess the effects chemical treatments have, particularly Schulze's process, on functional groups; and most importantly (3) to study the primary origin of FCs. Results are equivocal in respect to (1); (2) after Schulze's treatment aliphatic moieties tend to be reduced relative to oxygenated groups, and some aliphatic chains may be shortened; and (3) a primary chemical model is proposed. The model is based on a variety of geological observations, including stratal distribution, clay and pyrite mineralogies associated with FCs and compressions, and regional geological structure. The model presupposes compression-cuticle fossilization under anoxic conditions for late authigenic deposition of sub-micron-sized pyrite on the compressions. Rock joints subsequently provided conduits for oxygen-enriched ground-water circulation to initiate in situ pyritic oxidation that produced sulfuric acid for macerating compressions, with resultant loss of vitrinite, but with preservation of cuticles as FCs. The timing of the process remains undetermined, though it is assumed to be late to post-diagenetic. Although FCs represent a pathway of organic matter transformation (pomd) distinct from other plant-fossilization processes, global applicability of the chemical models remains to be tested. CCs and FCs are inferred endpoints on a spectrum of pomd which complicates assessing origin of in-between transformations (partially macerated cuticles). FCs index highly acidic levels that existed locally in the roof rocks.•

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Some geochemical aspects of sedimentary rocks in proximity of coals, sydney coalfield (upper carboniferous), cape breton island, nova scotia, canada

Cited by 11 publications

References 18 publications

The arborescent Linopteris obliqua plant (Medullosales, Pennsylvanian)

The arborescent Linopteris obliqua plant (Medullosales, Pennsylvanian)

A coal-sulfur model for Sydney Coalfield (Upper Carboniferous), Nova Scotia, Canada

A proposed origin for fossilized Pennsylvanian plant cuticles by pyrite oxidation (Sydney Coalfield, Nova Scotia, Canada)

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