Bahaman Calcareous Sands

Illing, L. V.

doi:10.1306/5ceadeb4-16bb-11d7-8645000102c1865d

Cited by 91 publications

(3 citation statements)

References 39 publications

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“…This difference most probably is related to a reservoir effect on faecal pellet ages, where Artemia absorbs suspended and dissolved carbonates from lake water without filtering (e.g. Eardley, 1938; Illing, 1954; Reeve, 1963). The chronological framework for the studied core using 14 C ages from faecal pellets and bulk sediment is compared with previously published radiocarbon ages obtained from Urmia Lake (Table S6; Fig.…”

Section: Discussionmentioning

confidence: 99%

Sedimentary evolution and lake level fluctuations of Urmia Lake (north‐west Iran) over the past 50 000 years; insights from Artemia faecal pellet records

Sarı,

Mohammadi,

Schwamborn

et al. 2023

Sedimentology

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A 25 m long sediment core from hypersaline Urmia Lake (north‐west Iran) was studied for the Late Quaternary depositional history and palaeoclimate variations using the abundance and compositional characteristics of Artemia fecal pellets. Sediment analysis is supported by scanning electron microscopy – energy dispersive X‐ray spectroscopy, organic and inorganic carbon contents measurements, and stable isotopes (δ13C and δ18O) from fecal pellet carbonates. The imprecise chronology of the core back to 50 kyr BP is supported by ten radiocarbon ages from fecal pellets and bulk sediments. The palaeoenvironmental record is subdivided into four periods: (i) During much of Marine Isotope Stage 3, a period of lake level lowering is characterized by a decreasing amount of fecal pellets, and an increasing amount of coated grains, sulphate minerals and reworked shell fragments. (ii) During late Marine Isotope Stage 3 and early Marine Isotope Stage 2 a lake level lowstand and a lake floor exposure is interpreted based on the relatively low abundance of pellets, which are multicoloured and appear together with volcanic lithics and rounded sulphate minerals. (iii) During late Marine Isotope Stage 2 the record is devoid of pellets but dominated by large sulphate crystals suggesting a prolonged low lake level. (iv) During Marine Isotope Stage 1 a relative lake level highstand is rapidly established with sediments that are highly abundant in fresh pellets. The modern lake level lowstand is represented by a salt crust. The δ13C and δ18O records measured from fecal pellet carbonates suggest a link with the precipitation versus evaporation balance in the lake over time. From bottom to top the linear trend towards more negative delta values illustrates the increasing amount of precipitation arriving at the lake from the Late Pleistocene to the Holocene. Two prominent isotope minima during the Late Pleistocene and one prominent minimum in the early Holocene mark relative high lake levels, which can also be linked to Lake Van in Turkey.

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Section: Discussionmentioning

confidence: 99%

Sedimentary evolution and lake level fluctuations of Urmia Lake (north‐west Iran) over the past 50 000 years; insights from Artemia faecal pellet records

Sarı,

Mohammadi,

Schwamborn

et al. 2023

Sedimentology

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“…The lobate-shaped peloids of subtype A are presumably aggregate grains, which underwent complete mi- critization. The formation of aggregate grains requires periods of sediment stabilization and cementation (Illing, 1954;Purdy, 1963;Taylor and Illing, 1969;Winland and Matthews, 1974;Wanless et al, 1981). Cementation is triggered by cyanobacteria, algae and fungi that live in the interstices between grains (e.g., Fabricius, 1977).…”

Section: Environmentmentioning

confidence: 99%

Facies types and depositional environments of a morphologically diverse carbonate platform: a case study from the Muschelkalk (Middle Triassic) of Upper Silesia, southern Poland

Matysik

2016

ASGP

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The detailed sedimentological study of the 150-m-thick Muschelkalk succession, deposited on a small (~200 by 80 km), morphologically diverse Upper Silesian carbonate platform during four major marine-transgressive pulses of the Tethys Ocean, enhanced the understanding of the depositional history, palaeogeography, and facies distribution. A total of thirty-five lithofacies types were identified, described and interpreted in terms of depositional settings. These different lithofacies represent various shallow-marine environments along the platform transect, from peritidal to offshore areas. The vertical and lateral organization of the lithofacies delineated was caused by the interplay of platform morphology, third-order eustasy and the long-term tectonic evolution of the area. Accordingly, the carbonate system studied is a good example of the influence of large-scale processes on the facies architecture of carbonate platforms. In general, all of the four Transgressive Systems Tracts are characterized by similarity in lithofacies composition and vertical succession and by minor lateral change, indicating only limited influence of the three large-scale factors mentioned on lithofacies development and distribution during transgressions. In contrast, each of the four associated Highstand Systems Tracts comprises an individual (unique) lithofacies assemblage displaying substantial regional and local variation, which indicates that the filling of accommodation space during highstands strongly depended on the extrinsic processes.

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“…They also include micritic grains or pelletoids sensu Blatt et al (1972), which are 50-500 mm angular or rounded pieces of dark micrite, with or without internal structures. These grains are most probably derived from the micritization of bioclasts (Illing 1954;Purser 1980), frequently observed on reef flats. Key bioclasts include bivalves, gastropods, echinoderms, corals, algae, bryozoans and foraminifers.…”

Section: Sediment Composition and Grain Sizementioning

confidence: 99%

Sedimentology and magnetic susceptibility of recent sediments from New Caledonia

Jadot

Boulvain

2015

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The interpretation of the primary origin of the minerals carrying the magnetic susceptibility (MS) signal from ancient rocks suffers notably from the scarcity of studies on Recent sediments. To bring new data, a study of tropical coastal sediments of New Caledonia was undertaken. This island is surrounded by a nearly uninterrupted reef barrier, isolating a wide lagoon from the open ocean. The erosion of extremely varied rocks (from mantle rocks to laterites) produces different types of detrital sediments, which are mixed with the indigenous precipitated carbonates. This generates different types of coastal sediments, detrital- or carbonate-dominated or mixed. More than 300 samples were analysed for grain size, nature of sediment, MS and geochemistry (major elements). The first results show that: (a) carbonate sands and carbonate silts are characterized by lower MS than detrital sediments; (b) the MS signal of mixed sediments is mostly influenced by the proportion of detrital sediments; (c) MS is directly correlated with Mn and Fe content; (d) beachrocks are characterized by lower MS than equivalent loose sediment; (e) the MS signal of carbonate sediments is locally positively correlated with granulometry; (f) there is no MS change between surface and 20 cm deep samples; and (g) when the subsurface sediment is reducing, the MS is higher than that from surface sediment.

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Bahaman Calcareous Sands

Cited by 91 publications

References 39 publications

Sedimentary evolution and lake level fluctuations of Urmia Lake (north‐west Iran) over the past 50 000 years; insights from Artemia faecal pellet records

Sedimentary evolution and lake level fluctuations of Urmia Lake (north‐west Iran) over the past 50 000 years; insights from Artemia faecal pellet records

Facies types and depositional environments of a morphologically diverse carbonate platform: a case study from the Muschelkalk (Middle Triassic) of Upper Silesia, southern Poland

Sedimentology and magnetic susceptibility of recent sediments from New Caledonia

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