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Sedimentary environment and provenance of sandstones from the Qadir member in the Nayband Formation, Tabas block, east-central Iran
by
Khanehbad, Mohammad
, Moussavi-Harami, Reza
, Mahboubi, Asadollah
, Zamaniyan, Ehsan
in
SEDIMENTOLOGÍA / SEDIMENTOLOGY
2021
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Sedimentary environment and provenance of sandstones from the Qadir member in the Nayband Formation, Tabas block, east-central Iran
by
Khanehbad, Mohammad
, Moussavi-Harami, Reza
, Mahboubi, Asadollah
, Zamaniyan, Ehsan
in
SEDIMENTOLOGÍA / SEDIMENTOLOGY
2021
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Sedimentary environment and provenance of sandstones from the Qadir member in the Nayband Formation, Tabas block, east-central Iran
Journal Article
Sedimentary environment and provenance of sandstones from the Qadir member in the Nayband Formation, Tabas block, east-central Iran
2021
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Overview
Qadir Member of Nayband Formation, located in East of Central Iran, has developed to a great extent. Investigation of the lithofacies and sedimentary environment, resulted in identification of the deltaic and marine deposits. Based on field evidence and facies features, Qadir Member consists of two lithofacies, including carbonate and siliciclastic facies. The siliciclastic facies were identified as having four sandstone facies including Sr, Sh, Sp, St, three finegrained lithofacies, including FI, Fm, Fl (Sr) / Sr (FI) and one coal facies. Also, regarding the field, laboratory studies, and identification of lithofacies, the coastal plain, deltaic (including deltaic plain, proximal delta front, distal delta front, and prodelta) and open marine environments were identified for Qadir Member which is is under the impact of tidal currents. The chemical weathering index (71%) indicated semi-arid to semi-humid conditions and plotting the geochemical data showed the provenance of re-cycling and active continental margin and because of Chemical Index of Alteration, the weathering rate was found to be rather medium to high. The geochemical diagrams also showed a probable source of the intermediate igneous and sedimentary rocks. The active continental margin conditions for this deposit could suggest the Neotethys subduction under Iran’s plate and volcanic activity at the end of Triassic, which coincided with the early Cimmerian orogeny in Alborz and Central East Iranian Microcontinent.
El miembro Qadir de la Formación Nayband, ubicada en el este del centro de Irán, se ha desarrollado en gran medida. La investigación de la litofacies y el medio sedimentario resultó en la identificación de los depósitos deltaicos y marinos. Basado en evidencia de campo y características de facies, Qadir Member consta de dos litofacies, incluidas facies de carbonato y siliciclástico. Se identificó que las facies siliciclásticas tenían cuatro facies de arenisca, incluidas Sr, Sh, Sp, St, tres litofacies de grano fino, incluidas FI, Fm, Fl (Sr) / Sr (FI) y una facies de carbón. Además, con respecto al campo, los estudios de laboratorio y la identificación de litofacies, se identificaron la llanura costera, deltaica (incluida la llanura deltaica, frente deltaico proximal, frente delta distal y prodelta) y ambientes marinos abiertos para el Miembro Qadir que se encuentra bajo el impacto. de las corrientes de marea. El índice de meteorización química (71%) indicó condiciones semiáridas a semihúmedas y el trazado de los datos geoquímicos mostró la procedencia del reciclaje y el margen continental activo y, debido al índice químico de alteración, la tasa de meteorización resultó ser bastante media. en lo alto. Los diagramas geoquímicos también mostraron una fuente probable de rocas ígneas y sedimentarias intermedias. Las condiciones del margen continental activo para este depósito podrían sugerir la subducción de Neotethys bajo la placa de Irán y la actividad volcánica al final del Triásico, que coincidió con la orogenia cimeria temprana en Alborz y el microcontinente iraní centro-este.
Publisher
Sociedad Geológica Mexicana & Instituto de Geología UNAM
Subject
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