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| Registros recuperados: 10 | |
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| Meysam Shafiee Ardestani; Ebrahim Ghasemi-Nejad. |
| Abderaz Formation at its type section with an age of Turonian-early Campanian and a thickness of 300 m contains light grey shale and marl. The study of the planktonic foraminifera in isolated form led to differentiate three morphotype groups. The first group is characterized by trochospiral tests usually indicate shallow waters, the second group contains forms with strong ornamentations and the primary keels representing mid waters and finally compact trochospiral tests with keels known as deep water indices are included in the third group. Studies on the morphotypes showed a regressive cycle for Abderaz Formation. Also the planktonic to benthic ratio was calculated using Depth = e^(3.58718 + (0.03534 × %*p)^ equilibrium which explains that at the... |
| Tipo: Manuscript |
Palavras-chave: Ecology; Earth & Environment. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/2787/version/1 |
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| Meysam Shafiee Ardestani; Abbas Abbasi. |
| In this research the Abderaz Formation at its type section with an age of Turonian-early Campanian and a thickness of 300 m containing.light grey shale and marls was investigated. Statistical Studise of the morphotype groups of planktonic foraminifera shows that the majority of them are of shallow water forms (SWF) and deep water forms (DWF) and planktonic to benthic ratio is high indicating specific condition of oligotrophy and sedimentation in a relatively deeper marine condition |
| Tipo: Manuscript |
Palavras-chave: Earth & Environment. |
| Ano: 2010 |
URL: http://precedings.nature.com/documents/4359/version/1 |
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| Meysam Shafiee Ardestani; Mohsen allameh; Esmail Kohansal. |
| In order to study the fossil contents of the Abderaz Formation for biostratigraphical purposes the 300 meters thick section was sampled at type section. The sequence is mainly made up of grey shales and marls with two units of chalky limestone in upper part. The lower contact of the formation with Aitamir Formation is disconform while the upper contact with Abtalkh is continuous. There are huge amounts of inoceramids and ammonite. In the chalk limestone bonds of this formation which is belong to Santonian time planktonic, would exist some foraminifera with a less diversity because during the Santonian, the members of morphotype group three (M3) shows a regression in the above-mentioned section, with association of tegilla shapes decreases in the area and... |
| Tipo: Manuscript |
Palavras-chave: Earth & Environment. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3944/version/1 |
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| Meysam Shafiee Ardestani. |
| Abderaz Formation at its type section with an age of Turonian-Early Campanian and a thickness of 300 m contains light grey shale and marl. The study of the planktonic foraminifera in isolated form led to differentiate three morphotype groups. The first group is characterized by trochospiral tests usually indicate shallow waters, the second group contains forms with strong ornamentations and the primary keels representing mid waters and finally compact trochospiral tests with keels known as deep water indices are included in the third group. Studies on the morphotypes showed a regressive cycle for Abderaz Formation. |
| Tipo: Manuscript |
Palavras-chave: Ecology; Earth & Environment; Evolutionary Biology. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3189/version/1 |
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| Meysam Shafiee Ardestani; Behnaz Balmaki; Massod Asgharian. |
| The main aim of this research is study of the planktonic foraminifera morphogroups distinction genus to perform by changing the umbilicus area in Ziarat-kola section to find novel results. Therefore, original objection at this research considers the cause of organizing umbilicus structures (Lip, Portici, Tegilla) at this protests. it seems that phylogeny trend entirely the changes of planktonic foraminifera changing from lip at primary morphogroup to tegilla at development shape which continued this phylogeny trend opening become entirely umbilicus that this trend accompanied to increasing deep. Therefore, the study of planktonic foraminifera morphotype, and recognizing, the obtained results from planktonic foraminifera analysis percent and their... |
| Tipo: Manuscript |
Palavras-chave: Ecology; Earth & Environment; Evolutionary Biology. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3342/version/1 |
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| Meysam Shafiee Ardestani; Ebrahim Ghasemi-Nejad; Ali Mandanizadeh. |
| The study of planktonic foraminifera of the Gurpi formations at Lar area (Kuh-e-kurdeh section) enables me to find the most standard biozones defined in mediterranean regions, especially Tethysian domain. Five biozones were determined. Biozones I (Globotruncanita elevata zone) and II (Globotruncana ventricosa zone) and III (Radotruncana calcarata zone) indicate the Early Campanian and Middle and Late Campanian, respectively. Biozones IV (Globotruncanita stuarti zone) and V (Gansserina gansseri zone) suggest the Early and Middle Maastrichtian, respectively. In the Late Maastrichtian, due to decreasing in water depth at the study area, Abathomphalus mayaroensis zone defined in Tethysian domain was not recognised.

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| Tipo: Manuscript |
Palavras-chave: Earth & Environment. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/2947/version/1 |
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| Masood Asgharian Rostami; Behnaz Balmaki; Meysam Shafiee Ardestani; Esmail Kohansal. |
| Jorband section is located in the north slope of central Alborz, and 28 Km south of Noor. It has been sampled and index fossilic groups of planktonic foraminifera and echinoids were studied in order to assign the paleosalinity and biozonation in central Alborz. The planktonic foraminiferal biozones identified within the Upper maastrichtian sequence of the Jorband section are three zones of Contustruncana contusa, Planoglobulina brazoensis, and Racemiguembelina fructicosa. The salinity changes were also searched in this section. In three layers in Jorband section examination echinocorys genus and is drawn as a diagram which in middle of the section, the salinity mounts is fewer than the beginning and top of the section. |
| Tipo: Manuscript |
Palavras-chave: Earth & Environment. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3699/version/1 |
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| Meysam Shafiee Ardestani; Masoud Asgharian rostami; Behzad Balmaki; Behnaz Balmaki. |
| Abderaz Formation at its type section with an age of Turonian-early Campanian and a thickness of 300 m contains light grey shale and marl. The study of the planktonic foraminifera in isolated form led to differentiate three morphotype groups. The first group is characterized by trochospiral tests usually indicate shallow waters, the second group contains forms with strong ornamentations and the primary keels representing mid waters and finally compact trochospiral tests with keels known as deep water indices are included in the third group. Studies on the morphotypes showed a regressive cycle for Abderaz Formation. In the present study the depth of Abderaz Formation was determined using planktonic morphotypes. As Results of the study all changes in test... |
| Tipo: Manuscript |
Palavras-chave: Earth & Environment. |
| Ano: 2010 |
URL: http://precedings.nature.com/documents/4264/version/1 |
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| Registros recuperados: 10 | |
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