Provenance of siliciclastic deposits of Jeirud Formation in central Alborz

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KHAZAEE M.; HOSSEINI BARZI M.; SADEGHI A.; MOSADDEGH H.

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Journal: GEOSCIENCES Year:2018 | Volume:27 | Issue:108 Page(s): 45-56

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Title

Provenance of siliciclastic deposits of Jeirud Formation in central Alborz

Author(s)

KHAZAEE M. | HOSSEINI BARZI M. | SADEGHI A. | MOSADDEGH H. | Issue Writer Certificate

Keywords

Jeirud FormationQ1

ProvenanceQ1

Tectonic settingQ2

Upper DevonianQ1

GeochemistryQ2

Abstract

The Upper Devonian Jeirud Formation Provenance was investigated by means of petrography, modal analysis and heavy minerals assemblage, and mudstones major and minor elements Geochemistry. Modal analysis results suggested recycled orogens, craton interior and passive margins as Tectonic settings of Jeirud Formation deposits. Based on modal analysis results, the Jeirud Formation siliciclastics were resulted from weathered plutonic and metamorphic rocks under humid to sub-humid climate conditions. Heavy minerals assemblages also, suggest a mixture of basic to acidic igneous rocks and recycling of older sedimentary rocks as the Provenance. Althogh based on high compositional maturity of Jeirud sandstones, weathering under humid to sub-humid climatic conditions is most likely, but several evidences such as existence of dolocrete and rhizolith, unstable heavy minerals (Pyroxene, Amphibole, Apatite), existence of Polygorskite clay mineral and lack of coal deposits are inconsistent with humid to subhumid climate conditions and suggest semi-arid to arid climatic conditions. Accordingly, relatively high maturity of the Jeirud sandstones can be related to recycling, low gradient, long distance transporting, and high energy conditions in coastal environment. Combinig of major element based plots and trace element based plots such as La-th-sc ternary plot and La/Th versus Hf plot is suggesting a mixture of felsic, mafic and quartz-bearing sedimentary rocks (Recycled) as the source rocks for the Jeirud Formation siliciclastic deposits. An integration of modal analysis and heavy minerals results into the geochemical studies including Verma and Armstrong-Altrin Functional diagrams, indicate that, siliciclastic rocks of the formation, are resulted from weathering of acidic-intermediate to basic rocks of collisional tectonic Provenances (recycled orogens). Investigations and comparison with previous studies, confirm that geochemical results and proportions of study area are consistent with those of old upper continental crust (OUC) typical of collisional Tectonic settings. The CIA values of mudstones are indicative of moderate to intense weathering typical of humid to sub-humid climatic conditions, which are unreliable and inconsistent with heavy minerals results and field and petrographical evidences (dolocrete and rhizolith) due to effects of recycling.

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APA: Copy

KHAZAEE, M., HOSSEINI BARZI, M., SADEGHI, A., & MOSADDEGH, H.. (2018). Provenance of siliciclastic deposits of Jeirud Formation in central Alborz. GEOSCIENCES, 27(108 ), 45-56. SID. https://sid.ir/paper/32553/en

Vancouver: Copy

KHAZAEE M., HOSSEINI BARZI M., SADEGHI A., MOSADDEGH H.. Provenance of siliciclastic deposits of Jeirud Formation in central Alborz. GEOSCIENCES[Internet]. 2018;27(108 ):45-56. Available from: https://sid.ir/paper/32553/en

IEEE: Copy

M. KHAZAEE, M. HOSSEINI BARZI, A. SADEGHI, and H. MOSADDEGH, “Provenance of siliciclastic deposits of Jeirud Formation in central Alborz,” GEOSCIENCES, vol. 27, no. 108 , pp. 45–56, 2018, [Online]. Available: https://sid.ir/paper/32553/en

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