Provenance of the Cretaceous Debre Libanos Sandstone in the Blue Nile Basin, Ethiopia: Evidence from petrography and geochemistry

Mohammedyasin, Mohammed Seid; Wudie, Gashaw

doi:10.1016/j.sedgeo.2018.10.008

Cited by 27 publications

(6 citation statements)

References 72 publications

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“…6.61 %). Because the concentration of Cr and Mg is high in mafic and ultramafic rocks and low in felsic rocks (Armstrong-Altrin et al 2004;Mohammedyasin & Wudie 2019), this change could reflect the initiation of the contribution of mafic-ultramafic sources in the composition of sediments. These variations imply a significant change in provenance from more felsic to intermediate-felsic sources (provenance shift 1 in Fig.…”

Section: Geochemistry Of Mudrocksmentioning

confidence: 99%

Provenance evolution of Oligocene–Pliocene foreland deposits in the Dezful embayment to constrain Central Zagros exhumation history

Etemad‐Saeed

Najafi

Vergés

2020

JGS

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This paper presents a detailed provenance analysis of the 6.5-km thick Oligocene-Pliocene foreland succession in the north Dezful embayment in Zagros, Iran. Using petrography, geochemistry, and paleoflow analysis, we determined three provenance shifts during the exhumation of Zagros orogen. Above the Ahwaz sandstones, sourced from the Arabian craton, a sharp decrease in SiO 2 /Al 2 O 3 , Zr/Sc, Th/Sc, Th/Co and Th/Cr within the Gachsaran Fm., and the appearance of first-cycle sands derived from metamorphic and volcanic rocks at the base of Aghajari Fm., characterize the onset of exhumation, rising topography and denudation of the Zagros orogenic system during latest Oligocene and constitute the first shift. The second shift, in middle Aghajari Fm., is marked by a distinct increase in radiolarian cherts and compatible/incompatible elements, indicating the exhumation of Neo-Tethyan radiolarite-ophiolite allochthonous slices in the High Zagros Zone during Tortonian (~9 Ma). A vast number of carbonates derived from nearby growing Izeh Zone anticlines characterize the Messinian (~7 Ma) Bakhtyari conglomerates marking the third shift. In conclusion, a detailed hands-on provenance analysis of the clastic sedimentary sequences in the north Dezful embayment enabled us to determine catchment areas and shifts hitherto unstudied thus contributing to the exhumation history of the Central Zagros orogenic system.

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Section: Geochemistry Of Mudrocksmentioning

confidence: 99%

Provenance evolution of Oligocene–Pliocene foreland deposits in the Dezful embayment to constrain Central Zagros exhumation history

Etemad‐Saeed

Najafi

Vergés

2020

JGS

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“…Chemical weathering leads to mineralogical and geochemical changes. ,, Mobile cations (Na, Ca, and K) are easily removed during chemical weathering than the immobile elements (Al and Ti). These changes are mainly influenced by tectonics, climate, parent lithology, and weathering duration. , CaO and Na 2 O are mostly removed more rapidly than K 2 O. , Several geochemical weathering indices and proxies are used to qualify the effect of subaerial chemical weathering on the parent bedrock. ,, The CIA is mainly used to reveal the intensity of weathering on parental bedrock. ,,, The CIA value for the studied samples ranges from 81 to 84% (Tables and ), suggesting a moderately weathered source.…”

Section: Discussionmentioning

confidence: 99%

“…Chemical weathering leads to mineralogical and geochemical changes. 11,61,62 Mobile cations (Na, Ca, and K) are easily removed during chemical weathering than the immobile elements (Al and Ti 36 ). These changes are mainly influenced by tectonics, climate, parent lithology, and weathering duration.…”

Section: Source Areamentioning

confidence: 99%

“…Fine-grained sediments generally preserve the geochemistry of their parent material. Thus, their geochemical signatures are widely used to interpret the paleoweathering conditions, provenance, depositional environments, paleoclimate, and diagenesis. − A wealth of data exists for various sedimentary basins that have been investigated based on the geochemical characters of fine-grained sediments. − …”

Section: Introductionmentioning

confidence: 99%

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Provenance Characterization of Campanian Lacustrine Organic-Rich Mudstones on the Southern Tethyan Margin, Egypt

Fathy

Wagreich

Ntaflos

et al. 2021

ACS Earth Space Chem.

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Campanian lacustrine organic-rich mudstones were deposited under a warm greenhouse climate in Egypt. In this study, integrated elemental geochemical analyses have been applied to discriminate the paleoweathering conditions, provenance, and tectonic setting of these mudstones. The studied samples are relatively enriched in Al, Ca, V, Sc, and Cr compared to Post-Archean Australian shales (PAAS). Their chondrite normalized REE patterns show enrichment in the light REE compared to heavy REE, with a negative Eu anomaly (Eu/Eu* = ∼0.77). The low values of Th/Sc (0.42), Zr/Sc (5.05), and Zr/Hf (36.3) for the studied samples indicate no input from recycled older sedimentary strata. The ratios of the compositional variability index (ICV = 0.76), K/Al (0.072), Al/Si (0.34), and K/Si (0.025) suppose that the mudstones are compositionally mature source rocks and originated in quiescent and low energy depositional environments. The average values of the chemical index of alteration (CIA = 82), chemical proxy of alteration (CPA = 94), and plagioclase index of alteration (PIA = 87) and ln(Al2O3/Na2O = 3.6) for the studied mudstones imply moderate to intensive chemical weathering. Moreover, the provenance sensitive elemental proxies (e.g., La/Sc, Th/Sc, Th/Cr, Cr/Th) and multiple discrimination diagrams reveal that the mudstones could be derived from intermediate igneous parent rocks. The lacustrine organic-rich sediments were sourced from a Phanerozoic to Proterozoic arc setting based on various tectonic discrimination diagrams.

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“…In particular, rare earth elements (REEs) whose chemical properties are relatively stable and who are almost unaffected by external factors such as weathering, transportation, sedimentation, or diagenesis are often used to trace provenance (Cox et al, 1995;Garver and Scott, 1995). For provenance analysis, with a continuous accumulation of element geochemical data, geoscientists have been on the way to a paradigm of big data coupled with machine learning (Tang et al, 2012;Wang et al, 2014;Amedjoe et al, 2018;Mohammedyasin and Wudie, 2019;Zhang et al, 2020;Li et al, 2020). However, randomly selected initial weights (and also biases) and possible loss of population diversity in traditional deep learning are pressing issues needed to be addressed and may lead to hard-to-interpret results.…”

Section: Introductionmentioning

confidence: 99%

Quantitative provenance analysis through deep learning of rare earth element geochemistry: A case from the Liuling Group of the East Qinling Orogen, Central China

Zhang

Yang²,

Zhang³

et al. 2022

Front. Earth Sci.

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With the ever-growing availability of massive geo-data, deep learning has been widely applied to geoscientific questions such as sedimentary provenance analysis. However, randomly selected initial weights (and also biases) and possible loss of population diversity in traditional neural network learning remain problematic. To address this issue, in this study, we proposed a new deep neural network model by incorporating genetic algorithm (GA) and simulated annealing algorithm into the BP neural network, i.e., the GA-SA-BP model. We then applied this new model to rare earth element (REE) geochemical data of the Liuling Group of the East Qinling Orogen to investigate its provenance. Our results showed that among other deep learning algorithms, the new model presents the best performance with good measuring metrics (e.g., over 85% of accuracy, over 0.82 of F1-macroaverage, F1-micro-average, and Kappa coefficient, and smallest (<0.15) Hamming distance). Here, we interpreted in accordance with the classification results that the southern margin of the North China Craton and the South Qinling Orogen are likely two major sources of the Liuling Group, suggesting a bidirectional deposition route of sediments from the north and south. Therefore, we proposed a foreland basin environment as the likely tectonic setting for the Liuling Group, which is consistent with current geological understanding. Our observations suggested that the GA-SA-BP model (or improved deep learning models) coupled with REE geochemistry is capable of provenance analysis.

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Provenance of the Cretaceous Debre Libanos Sandstone in the Blue Nile Basin, Ethiopia: Evidence from petrography and geochemistry

Cited by 27 publications

References 72 publications

Provenance evolution of Oligocene–Pliocene foreland deposits in the Dezful embayment to constrain Central Zagros exhumation history

Provenance evolution of Oligocene–Pliocene foreland deposits in the Dezful embayment to constrain Central Zagros exhumation history

Provenance Characterization of Campanian Lacustrine Organic-Rich Mudstones on the Southern Tethyan Margin, Egypt

Quantitative provenance analysis through deep learning of rare earth element geochemistry: A case from the Liuling Group of the East Qinling Orogen, Central China

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