A chemical and petrographic study of Pre-Cambrian sediments

Macpherson, H. G.

doi:10.1016/0016-7037(58)90095-4

Cited by 29 publications

(9 citation statements)

References 8 publications

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“…The average BaO content of 18 feldspathic graywackes is 0.05 percent, which corresponds to about 450 ppm Ba. The average of 16 Precambrian "arkosic and feldspathic" graywackes is 360 ppm Ba (Macpherson, 1958). The composite sample of 253 sandstones analyzed by Stokes (Clarke, 1924, p. 547) contains the same proportion of barium.…”

Section: Minor Elements In Sandstonesmentioning

confidence: 99%

“…Sahama (1945) found 2 to 8 ppm Ni in the quartzites of southern Lapland. Macpherson (1958) found 90 ppm Ni in Precambrian graywackes of Ontario. The high value is perhaps related to the argillaceous debris and matrix of these sandstones.…”

Section: Trace Elements In Sandstonesmentioning

confidence: 99%

“…This is about 775 ppm Mn, a figure of the same order of magnitude as the manganese content of shale and phyllite and the average igneous rock (Rankama and Sahama, 1950, p. 652). The average of 16 Precambrian "arkosic and feldspathic" graywackes is 579 ppm Mn (Macpherson, 1958). The high silica Orthoquartzites would probably be poorer in manganese content.…”

Section: Minor Elements In Sandstonesmentioning

confidence: 99%

“…Weber (1960) reported 9 to 37 ppm Cu for graywackes (mainly Ordovician) from eastern Canada and New York State. Macpherson (1958), however, reports an average of 46 ppm Cu in 16 "arkosic and feldspathic graywackes" of Precambrian age in Ontario. Macpherson's graywackes, as a class, are richer in copper than other sandstones perhaps because they come mainly from a mineralized province.…”

Section: Trace Elements In Sandstonesmentioning

confidence: 99%

“…This conclusion is supported by the Tanner graywacke (Helmbold, 1952) the fine, medium, and coarse specimens of which contain 37, 28, and 18 ppm B respectively. Macpherson (1958) reports 44 ppm B in 16 Precambrian "arkosic and feldspathic graywackes." A reasonable estimate for the average sandstone, therefore, is 25-35 ppm B. Glauconitic sandstones are notably enriched in boron.…”

Section: Trace Elements In Sandstonesmentioning

confidence: 99%

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Chemical composition of sandstones, excluding carbonate and volcanic sands

Pettijohn¹

1963

Professional Paper

107

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Section: Minor Elements In Sandstonesmentioning

confidence: 99%

Section: Trace Elements In Sandstonesmentioning

confidence: 99%

Section: Minor Elements In Sandstonesmentioning

confidence: 99%

Section: Trace Elements In Sandstonesmentioning

confidence: 99%

Section: Trace Elements In Sandstonesmentioning

confidence: 99%

See 3 more Smart Citations

Chemical composition of sandstones, excluding carbonate and volcanic sands

Pettijohn¹

1963

Professional Paper

107

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Chemostratigraphic characteristics of trace elements, biomarkers and clay mineralogy indicating environmental conditions within Aptian sediments of the Organyà Basin, North‐east Spain, prior to the onset of OAE 1a

Herdocia

Maurrasse

2022

The Depositional Record

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Shifting palaeoceanographic and palaeoclimatic conditions together with fluctuating eustatic sea levels during the Early Cretaceous Aptian stage led to a globally widespread deposition of organic-rich marine sediments designated Oceanic Anoxic Event 1a. Here a detailed lithostratigraphic and geochemical study is presented for 35.6 m of the Cabó Formation, part of the Organyà Basin, North-east Spain, to assess intermittent periods of enhanced organic carbon preservation in Lower Aptian sediments preceding Oceanic Anoxic Event 1a. The Organyà area contains well-exposed outcrops of Mesozoic black to dark grey marlstones and limestones with variable amount of organic matter (OM) indicative of oxygendeficient conditions. Previous work in a section near the town of Organyà focussed on lithostratigraphy and biostratigraphy and assigned a Barremian-Aptian age. This study aims to provide an updated age based on carbon isotope correlation established elsewhere, and assess the chemostratigraphic characteristics of the Barremian-Aptian to clarify environmental changes regarding oxygen deficient conditions in the basin at that time. The δ 13 C org values fluctuate from −22.1 to −24.4‰ showing concurrence with results at the El Pui section west of the studied section. Chemostratigraphic correlation of the δ 13 C org reveals that the section is within segment C2, in the Lower Aptian. Redox-sensitive trace elements (V, Ni, Co, Cr, Cu, Mo) indicate heightened dysoxic conditions at five organic-rich layers, here designated carbonaceous layers (TOC >2%), associated with enhanced terrigenous fluxes coincident with increased major elements (Al, Si and Ti) during these intervals. Biomarkers from six levels showed n-alkane distributions with chain lengths from nC 14 to nC 34 , mostly below nC 21 indicating a predominance of marine-derived OM. Climate conditions inferred from variable smectite, and kaolinite content suggests fluctuating humid-warm conditions. The results thus reveal that the Organyà Basin experienced intervals of distinct oxygen-poor conditions prior to the onset of Oceanic Anoxic Event 1a. How to cite this article: Herdocia C. & Maurrasse FJ-M.R. (2022) Chemostratigraphic characteristics of trace elements, biomarkers and clay mineralogy indicating environmental conditions within Aptian sediments of the Organyà Basin, North-east Spain, prior to the onset of OAE 1a.

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Literatur

Puchelt¹

1967

Zur Geochemie Des Bariums Im Exogenen Zyklus

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A chemical and petrographic study of Pre-Cambrian sediments

Cited by 29 publications

References 8 publications

Chemical composition of sandstones, excluding carbonate and volcanic sands

Chemical composition of sandstones, excluding carbonate and volcanic sands

Chemostratigraphic characteristics of trace elements, biomarkers and clay mineralogy indicating environmental conditions within Aptian sediments of the Organyà Basin, North‐east Spain, prior to the onset of OAE 1a

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