Architectural analysis of an Early Cambrian braided-river system on the north Gondwana margin: The lower sandstone of the Lalun Formation in the Shirgesht area, central Iran

Poursoltani, Mehdi Reza

doi:10.1016/j.jafrearsci.2020.103935

Cited by 7 publications

(1 citation statement)

References 63 publications

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“…The arkose unit is interpreted to have been deposited in fluvial and estuarine environments, followed by marine transgression during the deposition of the shale unit, and subsequent regression and deposition of the quartz‐rich unit in a shoreface environment (Bayet‐Goll & Daraei, 2020; Bayet‐Goll et al, 2018; Geyer et al, 2014; Lasemi & Amin‐Rasouli, 2016). The increase in grain size toward the Zagros zone, and W–SW to E–NE directed paleocurrents (Bayet‐Goll et al, 2018; Poursoltani, 2020) indicates sediment transport from the Gondwanan hinterland (Arabian Plate) toward Iran.…”

Section: Geological Settingmentioning

confidence: 99%

Evaluating sediment recycling through combining inherited petrogenic and acquired sedimentary features of multiple detrital minerals

2022

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An implicit assumption of most sedimentary provenance analyses is a direct link between source and sink. However, recycling of sedimentary detritus from pre‐existing strata interrupts the direct source‐to‐sink link and can result in incorrect interpretations of paleogeography and paleodrainage. Detrital zircon is the favoured proxy of contemporary provenance studies, but its physiochemical resilience makes it particularly prone to recycling. In this study, we integrate geochemical (age, isotope, and trace elements) and grain roundness data of multiple detrital minerals with different physiochemical stabilities (zircon, tourmaline, rutile, and apatite) to evaluate the importance of recycling in an ancient sedimentary basin. We focus on the early Cambrian Lalun Formation of Iran, which forms part of a laterally extensive sandstone‐rich succession deposited along the northern margin of Gondwana. The Lalun Formation preserves a distinct change of compositional maturity between lower arkose and shale units and an upper unit of quartz‐rich sandstone. Detrital zircon, rutile, and apatite data demonstrate that all units of the Lalun Formation share a common source in the Arabian‐Nubian Shield. Whole‐rock geochemical data further indicate that all units have similar chemical alteration indices, suggesting the change in compositional maturity is not a product of differential weathering of the source region. Analysis of grain roundness reveals that detrital zircon, rutile, and tourmaline in the upper quartz‐rich unit are typically more rounded than those in the underlying arkose and shale units. In contrast, detrital apatite grains are nearly all angular in the quartz‐rich unit but mostly rounded in the lower arkose and shale. Together, the detrital mineral provenance, whole‐rock geochemistry, and morphological data are consistent with recycling of the lower arkose and shale units of the Lalun Formation into the uppermost quartz‐rich unit, with the latter also receiving a component of first‐cycle detritus represented by angular detrital apatite. Our findings demonstrate that integrating the features of detrital minerals acquired during a sedimentary cycle (grain rounding and diversity of mineral assemblages) with features inherited from their ultimate source rocks (age, isotopic, and geochemical proxies) can assist in recognising sediment recycling in ancient strata.

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Section: Geological Settingmentioning

confidence: 99%

Evaluating sediment recycling through combining inherited petrogenic and acquired sedimentary features of multiple detrital minerals

2022

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Questionable suitability of pure geological publications to distant inventory of world-class palaeogeographical geosites

Ruban

2024

Discov Geosci

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Present acceleration of interest in geoheritage makes urgent a very large inventory of geosites in all parts of the world, which task cannot be achieved by only geoconservationists. Pure geological publications seem to be promising to deal with geosites without visiting them. To realize the existence of such an opportunity, ten fresh examples of research articles reporting exceptional palaeogeographical localities from the different geographical domains and geological time slices were considered. A semi-quantitative, score-based assessment of suitability (quality) of the published information was undertaken. This procedure should be distinguished from geosite evaluation, which is not the aim of this study. It was found that the outcomes of pure geological research published in journal articles can really help to identify world-class geosites, although the information from these articles is not enough to characterize geosites (especially regarding such properties as accessibility and vulnerability). Finding additional literature and realizing conservation status are the other challenges of geosite inventories based on only journal articles. Some recommendations for writing geoheritage-unrelated articles so to satisfy the needs of geoconservation were given.

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Sedimentary characteristics of sandy braided river deposits and factors controlling their deposition: A case study of the lower Shihezi Formation in the northern ordos basin, China

Tan

Tao

Wang

et al. 2023

Geoenergy Science and Engineering

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Architectural analysis of an Early Cambrian braided-river system on the north Gondwana margin: The lower sandstone of the Lalun Formation in the Shirgesht area, central Iran

Cited by 7 publications

References 63 publications

Evaluating sediment recycling through combining inherited petrogenic and acquired sedimentary features of multiple detrital minerals

Evaluating sediment recycling through combining inherited petrogenic and acquired sedimentary features of multiple detrital minerals

Questionable suitability of pure geological publications to distant inventory of world-class palaeogeographical geosites

Sedimentary characteristics of sandy braided river deposits and factors controlling their deposition: A case study of the lower Shihezi Formation in the northern ordos basin, China

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