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The Hizeh-Jan Kaolin Deposit of NW Iran:the Tetrad Effect in REE Distribution Patterns

Acta Geologica Sinica(English Edition) 2019年第1期93卷 74-87页

作者： ABEDINI Ali rezaei azizi mansour Department of Geology Faculty of Sciences Urmia University

The Hizeh-Jan kaolin deposit(northwest of Varzeghan, East-Azarbaidjan Province, NW Iran) is a product of the alteration of Eocene andesitic rocks. Based on mineralogical examinations, kaolinite, quartz, smectite, pyrophyllite, muscovite-illite, alunite, calcite, diaspore, goethite and hematite are the most abundant mineral phases in this deposit. The geochemical indicators, such as Y/Ho and Zr/Hf, indicate the non-CHARAC(non-Charge-radius control) behavior of these pairs, which are likely to be due to the occurrence of the tetrad effect phenomenon in this deposit. Simultaneous concave and convex shapes in the chondrite-normalized REE distribution patterns are a remarkable feature of the kaolin samples. Bivariate diagrams of the size of the third tetrad effect(T_3) versus geochemical parameters such as Y/Ho, Nb/Ta and Zr/Hf ratios display two distinct populations for the kaolin samples. The first population is characterized by high T_3 values(>0.13), which are near or on the fault zone. The second population is characterized by low T_3 values(<0.13), and are farther from the fault zone. The obtained results from the geochemical data have furnished compelling evidence that fluidrock interaction, overprint of hypogene processes by supergene ones, and structural control, are key controlling factors for the occurrence of tetrad effects in REE distribution patterns in the Hizeh-Jan kaolin deposit.

关键词： REE distribution Tetrad effect Kaolin Hizeh-Jan NW Iran

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REE Tetrad Effect as a Powerful Indicator of Formation Conditions of Karst Bauxites: A Case Study of the Shahindezh Deposit, NW Iran

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 912-927页

作者： Ali ABEDINI mansour rezaei azizi Ali Asghar CALAGARI Department of Geology Faculty of SciencesUrmia University*** UrmiaIran Department of Earth Sciences Faculty of Natural SciencesUniversity of Tabriz*** TabrizIran

Study of the concentration of major,trace,and rare earth elements(REE)in the Shahindezh karst bauxite deposit,northwestern Iran clarifies the relationship of the tetrad effect with geochemical parameters in the bauxite *** existence of irregular curves in the chondrite-normalized REE patterns as well as non-CHARAC behavior of geochemically isovalent pairs(Y/Ho)are related to the tetrad *** meaningful positive correlation between the sizes of the calculated T3 tetrad effect and some geochemical factors such as Y/Ho,ΣREE,La/Y,(La/Yb)N,and(LREE/HREE)N as well as some major oxides-based parameters like Al2O3+LOI/SiO2+Fe2O3,Al2O3/Fe2O3,Al2O3+LOI,IOL,and SiO2+Fe2O3indicate that the studied bauxite horizon was likely deposited by different(acidic and/or alkalic)solutions at different *** lower part of the studied horizon with a thickness of^4.7 m displays alkali characteristics whereas the upper parts of the horizon with a thickness of^5.3 m are characterized by more acidic *** results are fully supported by the co-occurrence of convex-concave tetrad effect curves in the chondrite-normalized REE ***,the tetrad effect phenomenon used in this study has proved to be a good and reliable geochemical proxy to assess the conditions of the depositional environment in the Shahindezh bauxite ores.

关键词： Geochemistry REE Tetrad effect Karst bauxite Shahindezh Iran

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The Lanthanide Tetrad Effect in Argillic Alteration: An Example from the Jizvan District, Northern Iran

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Acta Geologica Sinica(English Edition) 2018年第4期92卷 1468-1485页

作者： Ali ABEDINI mansour rezaei azizi Ali Asghar CALAGARI Department of Geology Faculty of Sciences Urmia University Department of Earth Sciences Faculty of Natural Sciences University of Tabriz

Intrusion of quartz-monzodioritic igneous bodies of Oligocene age into Eocene lithic crystal tufts and trachy-basalts resulted in the occurrence of a widespread argillic alteration zone in the Jizvan district （northern Iran）. Mineralogically, the argillie alteration zone includes minerals such as kaolinite, quartz, smectite, pyrophyllite, muscovite-illite, alunite, rutile, calcite, feldspar, chlorite, hematite and goethite. Therefore, the non-CHARAC behaviour for trace elements in the argillic samples is reflected in the non-chondritic Y/Ho and Zr/Hf ratios and the irregular REE patterns, which appear related to the tetrad effect phenomenon. The chondrite-normalized REE distribution patterns indicate both concave （W-shaped） and convex （M-shaped） tetrad effects in the argillic samples. Based on the field evidence and the results from geochemical studies, it can be concluded that the samples from the argillic alteration zone having high fourth tetrad effect values （〉0.30） were developed in the fault and breccia zones. The results indicate that factors such as preferential scavenging by Mn-oxides, crystallization of clay minerals, fluid-rock interaction, overprint of hypogene mineral assemblage by supergene ones, and the structural control, have all played an important role in the occurrence of tetrad effects in samples of the argillic zone in the Jizvan district.

关键词： REE geochemistry tetrad effect argillic alteration Jizvan Iran

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Primary oral and nasal transmissible venereal tumor in a mix-breed dog

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Asian Pacific Journal of Tropical Biomedicine 2016年第5期6卷 443-445页

作者： Mahdieh rezaei Shahrzad azizi Shima Shahheidaripour Sara Rostami Department of Clinical Science Faculty of Veterinary MedicineShahid Bahonar University Department of Pathobiology Faculty of Veterinary MedicineShahid Bahonar University Faculty of Veterinary Medicine Shahid Bahonar University

Transmissible venereal tumor(TVT) is a coitally transmitted tumor of dogs with widespread distribution. The present study describes the occurrence of the primary oral and nasal TVT in a 10-year-old, female, mix-breed dog. The case was presented with a history of anorexia, inability to swallow and dyspnea. Clinical examinations revealed the emaciation, muzzle deformity due to the presence of a friable, fleshy, cauliflower-like mass in the oral cavity and submandibular lymphadenopathy. TVT was diagnosed based on histopathological findings. The dog was discharged with therapeutic intervention with vincristine. Unfortunately, the case died before readmission because of the progressive worsening of the general condition. Our findings highlight the need for considering TVT for the differential diagnosis of the extragenital masses in dogs.

关键词： Transmissible venereal tumor Primary Oral Nasal Dog

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Management of Vascular Malformations in Dangerous Area of Oral Cavity: The Iranian Experience and Review of Treatment Modalities

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Open Journal of Stomatology 2014年第3期4卷 115-120页

作者： Somayeh Alirezaei Maryam Baharvand Masood rezaei Arash azizi Bita Tavakoli Dental School Islamic Azad University Tehran Iran Dental School Shahid Beheshti University of Medical Sciences Tehran Iran Oral and Maxillofacial Medicine Department Dental School Islamic Azad University Tehran Iran

Aim: To evaluate the effect of a highly potent corticosteroid (dexamethasone) in the treatment of vascular malformation when the location is difficult to reach and complications such as uncontrolled bleeding is predictable in surgery. Background: Vascular malformation is not a common lesion in oral cavity especially in alveolar ridge with extension to the pillar uvula. These lesions arise from capillary or venous malformations with various surgical or non-surgical treatment modalities. Case Description: We performed weekly intralesional injection of dexamethasone in a patient with a vascular malformation in alveolar ridge extending to the lingual side of alveolar ridge and posterior extension to the uvula. Complete resolution of lesion was observed after 6th injection. Conclusion: Intralesional injection of dexamethasone is a potentially curative method to treat oral vascular malformation. Clinical Significance: Injection of dexamethasone is a simple and cost-effective therapy that can be used as a safe treatment for vascular malformations prior to or as a substitute for surgery.

关键词： Vascular Malformation Intralesional Injection Dexamethasone

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