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Geochemistry of Carboniferous Sandstones (Sardar Formation), East-Central Iran: Implication for Provenance and Tectonic Setting

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Acta Geologica Sinica(English Edition) 2012年第5期86卷 1200-1210页

作者： mohammad KHANEHBAD Reza MOUSSAVI-HARAMI Asadollah MAHBOUBI Mehdi NADJAFI mohammad hosein mahmudy gharaie Department of Geology Faculty of Sciences Ferdowsi University of MashhadMashhad Iran

Geochemical analysis of sandstones from the Sardar Formation （from two stratigraphic successions） in east-central Iran were used for identification of geochemical characterization of sandstones, provenance and tectonic setting. Sandstones in the two lithostratigraphic successions have similar chemical compositions suggesting a common provenance. Bulk-rock geochemistry analysis of Carboniferous sandstones from Sardar Formation indicates that they are mainly quartz dominated and are classified as quartzarenites, sublitharenites and subarkoses, derived from acid igneous to intermediate igneous rocks. Discrimination function analysis indicates that the sandstones of Sardar Formation were derived from quartzose sedimentary provenance in a recycled orogenic setting. Also, major and trace elements in sandstones of Sardar Formation （e.g., K2O/Na2O vs. SiO2 ） indicate deposition in a stable passive continental margin （PM）. Chemical index of alteration （CIA） for these rocks （65%） suggests a moderate to relatively high degree of weathering in the source area.

关键词： provenance Carboniferous tectonic setting geochemistry Sardar Formation Iran

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Estimation of sediment load and erosion of different geological units: A case study from a basin of north-eastern Iran

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Journal of Mountain Science 2021年第6期18卷 1591-1608页

作者： Maryam TAJBAKHSHIAN Abolfazl MOSAEDI Mohamad hosein mahmudy gharaie Sayyed Reza MOUSSAVI HARAMI Department of Geology Ferdowsi University of MashhadMashhad ***Iran Department of Water Science and Engineering Ferdowsi University of MashhadMashhad ***Iran

Erosion of geological units and sediment load in rivers can be considered as the serious problems in recent *** sediment loads generate major hazards for water resources development,particularly in terms of loss of reservoir storage due to sedimentation and siltation of water distribution *** this paper,the performance of four sediment rating curve (SRC) development methods was evaluated for the Shirin Darreh River(SDR) basin (1750 km^(2)),located in North Khorasan Province,*** of flow discharge (Q) and suspended sediment flux (SSF)(Q-SSF pairs,N=957)and daily flow discharge,recorded by the Regional Water Company of North Khorasan (RWCNK) at the Qaleh-Barbar (QB) gauging site during 1989-2018 were *** flow discharge classification method performed best by meeting the desired criteria of most statistical indices,including normalized root mean square error (NRMSE),mean bias error (MBE),mean absolute error (MAE),index of agreement (d),and coefficient of determination (R^(2)).Based on the optimized method,the rate of suspended sediment transportation at the study site was estimated about2.7×10^(6) ton year^(-1).Erodibility of the exposed formations in the study area was estimated based on a factorial scoring model (FSM).Three indices,focused on the outcrop and erodibility,were calculated for the geological units at sub-basin and total *** deposits are the most extensive geological unit in the three sub-basins and the maximum formation outcrop ratio (FOR) and participation in erosion (PCE)were obtained for these rocks at total *** fact,marl unit can be regarded as the main source to supply the suspended sediments in the study basin.

关键词： Geological units Sediment rating curve Flow discharge Suspended sediment concentration Erodibility

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Facies Analysis and Sequence Stratigraphy of Silurian Carbonate Ramps in the Turan(Kopeh-Dagh) and Central Iran Plates with Emphasis on Gondwana Tectonic Event

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Acta Geologica Sinica(English Edition) 2015年第4期89卷 1276-1295页

作者： Zohreh NOWROUZI Asadollah MAHBOUBI Reza MOUSSAVI-HARAMI mohammad Hossein mahmudy gharaie Farzin GHAEMI Department of Geology Faculty of SciencesFerdowsi University of Mashhad

Two sections from the Silurian deposits in the Central Iran Micro and Turan Plates were measured and sampled. These deposits are mostly composed of submarine volcanic rocks, skeletal and non-skeletal limestone, shale and sandstone that were deposited in low to high energy conditions （from tidal flat to deep open marine）. According to gradual deepening trend, wide lateral distribution of facies as well as absence of resedimentation deposits, a depositional model of a homoclinal ramp was proposed for these deposits. Field observations and facies distribution indicate that, two depositional sequences were recognized in both sections. These sections show similarities in facies and depositional sequence during the Early Silurian in the area. Although there are some opinions and evidences that demonstrated Paleo-Tethys rifting phase started at the Late Ordovician-Early Silurian, similarities suggest that the Turan and Iran Plates were not completely detached tectonic block during this time, and that their depositional conditions were affected by global sea level changes and tectonic events.

关键词： facies sequence stratigraphy Silurian Central Iran Plate Turan Plate

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