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Open Access Article
1 - Microbiostratigraphy and Sequencestratigraphy of the Gurpi Formation in central part of Lorestan zone, SW Iran
Ghamarnaz Darabi Iraj Maghfouri Moghaddam Abbas Sadeghi Bijan Yusefi -
Open Access Article
2 - Microbiostratigraphy of the lower Cretaceous strata from South East of Maragheh, NW Iran
Mahmoud Reza Majidifard Parvaneh Zavar Morteza Taherpour Khalil Abad Masoud Zamani Pedram Taiebeh Mohtat -
Open Access Article
3 - Neocomian Fahliyan formation carbonates in the oil well X2 (Dorood oil field, Persian Gulf): Biostratigraphic data from benthic foraminifera and algae
لیلا رستمی سیدحمید وزیری داود جهانی علی سلگی مرتضی طاهرپور خلیل آباد ایوانا زورن گراویک احمد یحیایی -
Open Access Article
4 - Biozonation, Paleobathymetry and paleoenvironmental study of the Gurpi Formation in southwestern Iran
Taghi Farmani Ebrahim Ghasemi-Nejad Bijan Beiranvand Saeed Maleki-Porazmiani -
Open Access Article
5 - Biostratigraphy correlation, of Cretaceous successions in Kuh-e-Rahmat and Kuh-e-Sabz sections, NE Shiraz, Zagros (SW Iran)
Reza Haftlang Massih Afghah Ali Aghanabati Mahnaz Parvaneh Nejad Shirazi -
Open Access Article
6 - Microbiostratigraphy of the Qom Formation in south and west of Tafresh, Central Iran
I. Maghfouri Moghadam S. Borji E. Amini S. Azadbakht M. Taherpour Khalil AbadThe Qom Formation, a series of shales, sandstones and carbonate deposits, is the last transgression of the sea in Central Iran sedimentary basin. Foraminifera are one of the most important and numerous fossil groups present in the Qom Formation. In this study, the micro MoreThe Qom Formation, a series of shales, sandstones and carbonate deposits, is the last transgression of the sea in Central Iran sedimentary basin. Foraminifera are one of the most important and numerous fossil groups present in the Qom Formation. In this study, the micropaleontology of the Qom Formation in three measured stratigraphic sections in south and west of Tafresh (Rakin, Band-e-Ali Naghi Beig and Hezar Abad) are discussed. Except of the Rakin stratigraphic section, the lower and upper boundaries of the Qom Formation with Lower and Upper Red formations are conformable from the stratigraphy point of view. But, there is no outcrop in the upper boundary of the Rakin stratigraphic section. The study of 78 samples which were taken from the studied sections led to the identification of 34 genera and 39 species of benthonic foraminifera, 2 genera and 2 species of planktonic foraminifera, 4 genera of red algae and 3 genera of bryozoan. Based on the recognized foraminifera such as Lepidocyclina (Nephrolepidina), Miogypsioides sp., Meandropsina anahensis, Ammonia beccarii the age of the Qom Formation in the Rakin stratigraphic section is determined as Chatian-Aquitanian and in the Band-e-Ali Naghi Beig stratigraphic section as well as the Hezar Abad stratigraphic section is determined as Aquitanian. Manuscript profile -
Open Access Article
7 - The Microbiostratigraphy and Depositional History of the Turonian–Santonian Surgah Formation at the Northern Flank of the Kuh-e Sepid Anticline, Lorestan Basin
Iraj Maghfouri MoghaddamIn this research, the microbiostratigraphy and depositional environmental implications related to the Surgah Formation at the northern flank of the Kuh-e Sepid anticline in the Lorestan Basin are discussed. A study of small planktonic foraminifera from the 101-m-thick S MoreIn this research, the microbiostratigraphy and depositional environmental implications related to the Surgah Formation at the northern flank of the Kuh-e Sepid anticline in the Lorestan Basin are discussed. A study of small planktonic foraminifera from the 101-m-thick Surgah Formation led to the identification of three Turonian–Santonian biozones: (1) Helvetoglobotruncana helvitica, (2) Marginotruncana sigali, and (3) Dicarinella concavata. The age of the Surgah Formation in the study area is determined as Turonian–Santonian. The Surgah Formation overlies the Sarvak Formation and underlies the Ilam Formation in the studied stratigraphic section. Based on an analysis of pelagic foraminiferal assemblages and microfacies features, seven different microfacies have been recognized. These can be grouped into three depositional environments: the inner, middle, and outer ramps. Manuscript profile -
Open Access Article
8 - Microbiostratigraphy of Middle Eocene ShahbazanFormation at the southeastern flank of Chenar Anticline,Lurestan Basin, Sw Iran
I. Maghfouri Moghadam M. Taherpour Khalil AbadIn this research, biostratigraphy related to the carbonate succession of the Shahbazan Formation at the southeastern flank of Chenar anticline, Lurestan Basin, is discussed. A study of large benthic foraminifera from the 294 mthick Shahbazan Formation led to the identif MoreIn this research, biostratigraphy related to the carbonate succession of the Shahbazan Formation at the southeastern flank of Chenar anticline, Lurestan Basin, is discussed. A study of large benthic foraminifera from the 294 mthick Shahbazan Formation led to the identification of two Middle Eocene biozones: Somalina sp. Zone, Nummulites-Alveolina Assemblage Zone. The age of the Shahbazan Formation in the study area is determined as Middle Eocene. The Shahbazn Formation overlies the Pabdeh Formation and underlies Asmari Formation in the studied stratigraphic section. The lower part of Asmari Formation is characterized by thick – bedded of limestone, with Nerpherolepidina sp., which reflects deposition during Chattian age. In this study, we introduced a paraconformity between Shabazan and Asmari Formations which is attributed to the PriabonianChattian. Manuscript profile -
Open Access Article
9 - lithostratigraphy and biostratigraphy Studies of Eocene sediments of Halegan well of folded Zagros
فرشته GHaseminia بهاءالدین HamdiIn order to study and inspect of biostratigraphy and lithostratigraphy of Eocene sediments of Haleganwell in folded zagros 100 thin microscopic sections of this well’s samples was studied. Mentionedstudies caused to recognize 12 genus and 25 species of Planktonic MoreIn order to study and inspect of biostratigraphy and lithostratigraphy of Eocene sediments of Haleganwell in folded zagros 100 thin microscopic sections of this well’s samples was studied. Mentionedstudies caused to recognize 12 genus and 25 species of Planktonic foraminifera. According to spreadstratigraphy planktonic foraminifera 3 Biozone (P6, P13, P16/P17) that separated and introduced forEocene sediments in this well by D.Verga & R.Rettori (2003). Subsurface of section stratigraphy iscompared with wynd Biozons (wynd,1965). According to recognized and separated biozons, Wyndbiozonation is included 45, 47, 50. In this essay Pabdeh formation in Halegan well was introduced andcompared both D,Verga & R.Rettori (2003) and Wynd (1965) Biozone. Results of comparison revealsthat the best zonation for Pabdeh formation in Halegan well is D.Verga & R.Rettori (2003) Biozone.Pabdeh formathion is included a sequence of shale, marl, argillaceous limestone layers and their colorsare usually gray, withe-brown in Halegan well. Pabdeh formation had been formed high depth of sea.It is an evidence for depth of zone in this area in Eocene period. According to this studies it seemsHalegan well had been full of water in Eocene period the most onlap of sea had been in this period Manuscript profile -
Open Access Article
10 - Biostratigraphy of Campanian – Maastrichtian & Danian on the based of plankton foraminifera in Galanderud area, northern flanks of Alborz mountains
Roza Khajehtash Behrouz DarvishzadIn central Alborz Mountains in north of Iran, a new Cretaceous-Tertiary boundary (K/T) section near GalanderudMine in Mazandaran province reveals diversity of planktonic foraminiferal the fauna similar to those found inElKef & Elles in Thunisia.The Cretaceous-Tertia MoreIn central Alborz Mountains in north of Iran, a new Cretaceous-Tertiary boundary (K/T) section near GalanderudMine in Mazandaran province reveals diversity of planktonic foraminiferal the fauna similar to those found inElKef & Elles in Thunisia.The Cretaceous-Tertiary boundary is located by planktionic foraminifera with in a narrow interval bounded bylast appearance of tropical and subtropical Cretaceous species and first appearance of small Tertiary species. InGalanderud section only 5 species survived after the Cretaceous-Tertiary boundary event and 31 species ofCretaceous became extinct in or before Cretaceous-Tertiary boundary. The Maastrichtian species that seem todied out gradually are generally large and cosmopolitan. Manuscript profile -
Open Access Article
11 - The Effect of Heavy Metals (Cu, Cd, Zn, Cr , Ni) onDiversity and Density of Benthic Foraminifera in the Sediments of the Southern Coast of Caspian Sea (From Abbas-Abad to Ramsar)
Mona Eghbali Setareh Piroozmanesh Babak Moghaddasi Masomeh Sohrabi Pargol Ghavam MostafaviIn order to identify and assess the relationship between Benthic Foraminifera with environmental factors andheavy metals (Pb, Cd, Zn, Ni, Cr and Cu) the effects of these metals on the variety and condensation of BenthicForaminifera on the southern coast of the Caspian S MoreIn order to identify and assess the relationship between Benthic Foraminifera with environmental factors andheavy metals (Pb, Cd, Zn, Ni, Cr and Cu) the effects of these metals on the variety and condensation of BenthicForaminifera on the southern coast of the Caspian Sea (between Abas Abad and Ramsar) were studied. Sampleswere gathered in May 2012 from 5 transects at four depths (5, 10, 15 and 20 meters). The extent ofenvironmental factors of sea floor adjacent waters such as electrical conductivity (EC), salinity, temperature,acidity (pH), dissolved oxygen during sampling and concentration of heavy metals, total organic matters(T.O.M) and the diameter of sediment particles were determined through laboratory procedures. Averageconcentration for the heavy metals were Pb 48/08, Cd 3/30 and Cu 20/86,Zn 64/76, Ni 36/50 and Cr 36/92 partsper million (ppm), also the mean diameter of the sediment particles was 0/21 mm and the average percentage ofthe total organic matter was 3/59. Average water temperature near the sea floor was 26/09 ° C, EC 18/62 µs/cm,salinity 13 parts per thousand, acidity 8/34 and dissolved oxygen 9/98 milligrams per liter. Results from thedensity and diversity of Foraminifera show a dominant species of Ammonia beccarii from the four species ofbenthic. It shows that this species belongs to three genera of 3 families coming from the same line. Most of thedeposits in this region were fine sand, very fine sand, silt, and clay. Results show an increase in the frequencyand density of Foraminifera with the increase of silt and clay. Positive correlation between the diversity ofForaminifera and environmental factors like dissolved oxygen, organic matters, depth and electricalconductivity in the region under study shows an increase of condensation of this group with an increase in theextent of the factors pre-mentioned. Also a negative correlation between the diversity of Foraminifera, Zn andCr shows a decrease of condensation when these metals increase. Finally no significant difference or correlationwas seen regarding the diversity of Foraminifera, environmental factors and heavy metals. . Also Chromiumshowed noticeable difference in the depths under study as in deeper depths the amount of Cr decreased.. Finally,the existence of Benthic Foraminifera with morphological abnormalities in the structure of the crust in thisregion indicates the presence of pollution in the sea floor. Manuscript profile -
Open Access Article
12 - Microbiostratigraphy of Asmari formation at Derak section (Shiraz)
KHosro KHosro-Tehrani فریده Keshani مسیح Afgheh معصومه AhmadiThis study concentrates on biostratigraphy Asmari Formation on Derak section that is located at Shiraz city with333.5 meter thickness. Asmari Formation in this section comprises of limestone with marlyinterbedded.AsmariFormation trasitionally overlies the Jahrum Formati MoreThis study concentrates on biostratigraphy Asmari Formation on Derak section that is located at Shiraz city with333.5 meter thickness. Asmari Formation in this section comprises of limestone with marlyinterbedded.AsmariFormation trasitionally overlies the Jahrum Formation and underlies the Razak Formation. 3 lithologic unitsidentified within the Asmari Formation in this section. In the Micropaleontological study, Asmari Formation atDerak section led to identify 31 genera and 38 species benthic foraminifera.Therfore, in this study the base of biostratigraphy is on benthic foraminifera. In biostratigraphy study, Wynd sreport (1965) and Adams and Bourgeois (1967) report are such as pattern. The first appearance ofArchaiasasmaricus and Meandropsinaanahensisand Peneroplisthomasi show the boundary between Oligocene(chattian)-Miocene (Aquetanian). Biozone no. 1 is comparable to biozone no. 2 Adams and Bourgeois(1967) andbiozone no. 59 Wynd(1965) and middelASmari in Thomas (1949) report.Biozone no. 2 identified withappearance of Nummulitesfichteli,N.intermediusalso in this zone there is Archaiasoperculiniformis. Biozone no.2 is synonymous with biozone no. 3 Adams and Bourgeois (1967) and biozone no. 57, 58 Wynd (1965). Finally,the biozone no. 2 show Oligocene and synonymeous with lower Asmari of Thomas (1949). Manuscript profile -
Open Access Article
13 - Study of Microfaunistic of foraminifera in Holocene surface sediments of the Asalouyeh area – persian Gulf
معصومه Molaei معصومه Sohrabi-Molahoseini سارا Kahrobaei-MonfaredConsidering the economic importance of this region, for the first time some studies on superficial sediments(deposits) foraminifera were carried out in this region. Purpose of these studies was to investigate effect ofenvironmental changes on foraminifera and to use the MoreConsidering the economic importance of this region, for the first time some studies on superficial sediments(deposits) foraminifera were carried out in this region. Purpose of these studies was to investigate effect ofenvironmental changes on foraminifera and to use them as bio-indices in diagnosis of contaminations. In thestudies regarding foraminifera, 12 genus and14 species were identified and foraminifera with hyaline lime shellhad the greatest frequency. The main identified collection is: Ammonia beccarii Linne.And the speciesaccompanying this collection are: Amphistegina lessonii, Elphidiom crispum, Elphidiom craticulatum,Triloculina tricarinata, Quniqueloculina seminulum, Ammonia parkinsoniana, Eponides repandus, Dendritinaambigua After foraminifera with hyaline lime shell, foraminifera with selenosis progeny shell were ranked nextin terms of frequency. However, foraminifera with agglutinated shell were not observed in this region. Ingeneral, the obtained results from mineralogy studies on deposits of the ebb and flow area is the evidence thatmajor part of the sediments are related to continental environment of the detrital deposit type. In sectionecological studies, water's physicochemical factors are measured. Based on these studies, increase of water'stemperature and salinity results in decrease of solution oxygen in water and water's acidity degree. However, ingeneral, water's acidity fluctuation is slight and insignificant. The most important physicochemical factoraffecting development of foraminifera is amount of solution oxygen in water which controls their frequency anddiversity. Precipitation of oil carbohydrates and other contaminators produced by petrochemical activities in theregion ruins the bio-environment, reduces solution oxygen, and gives rise to release of heavy and toxic metals(mercury and lead) from solid state to liquid which leaves numerous negative effects on marine andenvironmental ecosystem Manuscript profile -
Open Access Article
14 - Microbiostratigraphy of the Gurpi Formation in Mook Area (South of Shiraz)
Mohammadreza Esmaeilbeig Khosro Khosrotehrani -
Open Access Article
15 - The Dzhulfian stage foraminifera from Azarbaijan, NW Iran
Rahim Shabanian Mosa Bagheri -
Open Access Article
16 - Biostratigraphy and depositional environment of the Asmari Formation in Gachsaran Well No. 25
Iraj Maghfouri Moghadam Mohammad Akbari Ali Rahmani -
Open Access Article
17 - Microbiostratigraphy study of Kazhdumi and Sarvak Formations in north and north- east Shiraz
Vahid Ahmadi Khosro Khosrowtehrani Masih Afghah