University of IsfahanJournal of Stratigraphy and Sedimentology Researches2008-788829120130522Recognition of depositional environment of the Gurpi Formation based on palynofacies in compared to field studies and sedimentary microfacies analysis in northeast IzehRecognition of depositional environment of the Gurpi Formation based on palynofacies in compared to field studies and sedimentary microfacies analysis in northeast Izeh12416787FAEbrahimGhasemi-NejadBijanBeiranvandJournal Article20160614 This investigation is an integrated of full field descriptions of lithology, sedimentary structures, ichnofacies, stratigraphic surfaces and natural gamma ray loging and detailed sedimentary and palynological microfacies analysis to identify depositional environment of the Gurpi Formation in northeast Izeh. A total of 148 samples were collected from the studied section to prepare palynological slides (80 samples) and thin sections (68 samples).  The results of the field study and sedimentary micofacies analysis indicate a low energy, disoxic to anoxic, relatively deep marine carbonate system with partially terrestrial organic matter for the Gurpi Formation. On the other hand, the palynofacies analysis indicates that the main components of the sedimentary organic matter are amorph organic matter (AOM), phytoclasts, palynomorphs (POM), and minor amounts of foraminiferal test linings and the other palynological elements. However, based on the aboundance of the palynological elements and using the Tyson's Triplot to represent the data, three main palynofacies zones of VI, VIII, and IX were recognized. Distribution of the data in these three palynofacies zones obviously indicates a disoxic to anoxic proximal to distal shelf conditions. In addition, the presence of thermal index dynocysts in the sediments reveals a tropical to subtropical warm Tethyan outer shelf environment of deposition for the succession in the Late Cretaceous to Paleocene. This investigation is an integrated of full field descriptions of lithology, sedimentary structures, ichnofacies, stratigraphic surfaces and natural gamma ray loging and detailed sedimentary and palynological microfacies analysis to identify depositional environment of the Gurpi Formation in northeast Izeh. A total of 148 samples were collected from the studied section to prepare palynological slides (80 samples) and thin sections (68 samples).  The results of the field study and sedimentary micofacies analysis indicate a low energy, disoxic to anoxic, relatively deep marine carbonate system with partially terrestrial organic matter for the Gurpi Formation. On the other hand, the palynofacies analysis indicates that the main components of the sedimentary organic matter are amorph organic matter (AOM), phytoclasts, palynomorphs (POM), and minor amounts of foraminiferal test linings and the other palynological elements. However, based on the aboundance of the palynological elements and using the Tyson's Triplot to represent the data, three main palynofacies zones of VI, VIII, and IX were recognized. Distribution of the data in these three palynofacies zones obviously indicates a disoxic to anoxic proximal to distal shelf conditions. In addition, the presence of thermal index dynocysts in the sediments reveals a tropical to subtropical warm Tethyan outer shelf environment of deposition for the succession in the Late Cretaceous to Paleocene.https://jssr.ui.ac.ir/article_16787_996154cc718d08d156fb430d3c9ad1e8.pdfUniversity of IsfahanJournal of Stratigraphy and Sedimentology Researches2008-788829120130522Stratigraphic Position and Textural Analysis of Volcanic Rocks of Abbas Abad Volcano-Sedimentary Belt, NE ShahroodStratigraphic Position and Textural Analysis of Volcanic Rocks of Abbas Abad Volcano-Sedimentary Belt, NE Shahrood254216788FAAzizollahTaheriSamiraAllahyariHabibollahGhasemi0000-0001-5446-9961MahmoudSadeghianJournal Article20160614 Abbasabad Volcano-Sedimentary Belt in the northeast edge of Central Iran structural zone extends from Davarzan in west of Sabzevar to Mayamay in east of Shahrood and then changed its trend to south, joined to Biarjomand â Toroud - Moalleman magmatic belt in south and southeast of Shahrood. Local stratigraphic sequence of this belt from buttom to top in Davarzan- Abbas Abad district are composed of Paleocene- Eocene terrigenous sedimentary rocks (conglomerate, sandstone, siltstone, shale), alternation of basic â intermediate lavas and related pyroclastics in association with interbedded sedimentary layers (tuffaceous shale, tuffaceous sandstone, shale, siltstone, sandstone, conglomerate and Nummulitic limestones) belong to middle-upper Eocene and Oligocene terrigenous sedimentary rocks (conglomerate, sandstone, siltstone, shale). Field and laboratory studies indicate the extrusion of basaltic-trachyandesitic lavas in an unstable basin, from sub-aerial to very shallow marine (lagoon and open sea) environment in middle-upper Eocene. The presence of imperforate foraminifera indicates a low-energy, upper photic, shallow shelf lagoon depositional environment. The co-occurrence of perforate foraminifera biota such as small Nummulites with imperforate foraminifera such as miliolids, indicates that sedimentation took place in an open shelf lagoon. In some layers, the presence of large flat Nummulitids indicate that the sedimentary environment was formed in an open marine environment under normal marine salinity conditions with open water circulation and low hydrodynamic energy. The studied volcanic rocks with a compotitional range from olivine basalt to trachybasalt, basaltic trachyandesite and trachyandesite show the liquid line of descent (melt differentiation) in a fractional series from olivine basalt to trachyandesite. Textural variety and continuous changes including appearance and disappearance of some minerals and disequilibrium textures indicate a complicate path of magma generation, take place of magma chamber processes and rising of mantlic magma in a continental margin subduction zone. Abbasabad Volcano-Sedimentary Belt in the northeast edge of Central Iran structural zone extends from Davarzan in west of Sabzevar to Mayamay in east of Shahrood and then changed its trend to south, joined to Biarjomand â Toroud - Moalleman magmatic belt in south and southeast of Shahrood. Local stratigraphic sequence of this belt from buttom to top in Davarzan- Abbas Abad district are composed of Paleocene- Eocene terrigenous sedimentary rocks (conglomerate, sandstone, siltstone, shale), alternation of basic â intermediate lavas and related pyroclastics in association with interbedded sedimentary layers (tuffaceous shale, tuffaceous sandstone, shale, siltstone, sandstone, conglomerate and Nummulitic limestones) belong to middle-upper Eocene and Oligocene terrigenous sedimentary rocks (conglomerate, sandstone, siltstone, shale). Field and laboratory studies indicate the extrusion of basaltic-trachyandesitic lavas in an unstable basin, from sub-aerial to very shallow marine (lagoon and open sea) environment in middle-upper Eocene. The presence of imperforate foraminifera indicates a low-energy, upper photic, shallow shelf lagoon depositional environment. The co-occurrence of perforate foraminifera biota such as small Nummulites with imperforate foraminifera such as miliolids, indicates that sedimentation took place in an open shelf lagoon. In some layers, the presence of large flat Nummulitids indicate that the sedimentary environment was formed in an open marine environment under normal marine salinity conditions with open water circulation and low hydrodynamic energy. The studied volcanic rocks with a compotitional range from olivine basalt to trachybasalt, basaltic trachyandesite and trachyandesite show the liquid line of descent (melt differentiation) in a fractional series from olivine basalt to trachyandesite. Textural variety and continuous changes including appearance and disappearance of some minerals and disequilibrium textures indicate a complicate path of magma generation, take place of magma chamber processes and rising of mantlic magma in a continental margin subduction zone.https://jssr.ui.ac.ir/article_16788_8d33c0f92b4818f4fe4aa16231c8756c.pdfUniversity of IsfahanJournal of Stratigraphy and Sedimentology Researches2008-788829120130522The role of calcareous algaes in reconstruction of sedimentary environment of Ruteh Formation in Sibestan area (Central Alborz)The role of calcareous algaes in reconstruction of sedimentary environment of Ruteh Formation in Sibestan area (Central Alborz)435816789FADavoodJahaniGelarehBabaee KhouMohammad HosseinAdabiGelarehBabaee KhouSeyed HamidVaziriJournal Article20160614https://jssr.ui.ac.ir/article_16789_6679b1ecd1d65f29bf1c1e5528540175.pdfUniversity of IsfahanJournal of Stratigraphy and Sedimentology Researches2008-788829120130522Calcareous nannofossils biostratigraphy of Late Maastrichtian- Early Paleocene in Sheikh Makan section (North-East of Kabir kuh)Calcareous nannofossils biostratigraphy of Late Maastrichtian- Early Paleocene in Sheikh Makan section (North-East of Kabir kuh)597816790FASeyed AliAghanabatiMohammadParandavarAzamMahanipurMohammadParandavarJournal Article20160614https://jssr.ui.ac.ir/article_16790_2372f39e7361774195ee87446fff4872.pdfUniversity of IsfahanJournal of Stratigraphy and Sedimentology Researches2008-788829120130522Sedimentary facies of a Distally steepened ramp with special sight on the turbidite deposits of the Lower Carboniferous deposits of Mighan area, The Eastern AlborzSedimentary facies of a Distally steepened ramp with special sight on the turbidite deposits of the Lower Carboniferous deposits of Mighan area, The Eastern Alborz7910216791FAMahmoudHosseini NejadHosseinMosaddeghMaryamSadegh ZadehJournal Article20160614https://jssr.ui.ac.ir/article_16791_5c9a0632a125c1a30991753ec3836935.pdfUniversity of IsfahanJournal of Stratigraphy and Sedimentology Researches2008-788829120130522Foraminiferal biozonation of the Lower Carboniferous depositions in the Valiabad section and comparison with the Namur and Dinant basin of BelgiumForaminiferal biozonation of the Lower Carboniferous depositions in the Valiabad section and comparison with the Namur and Dinant basin of Belgium10311816792FAMaryamnazBahrammaneshDanielVachardBahramNajafianKeyvanZandkarimiSeyed HamidVaziriJournal Article20160614https://jssr.ui.ac.ir/article_16792_c2b64213a1495011d14bb3c945278f4f.pdf