Iranian Journal of Earth Sciences最新文献

Sedimentological and provenance analysis of the Cretaceous Moro formation Rakhi Gorge, Eastern Sulaiman Range, Pakistan 巴基斯坦东苏莱曼山脉白垩系Moro组Rakhi峡谷的沉积学和物源分析

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Iranian Journal of Earth Sciences Pub Date : 2021-10-01 DOI: 10.30495/IJES.2021.1917721.1564

Muhammad Jehangir Khan, S. Ghazi, M. Mehmood, A. Yazdi, A. Naseem, Umair Serwar, Arsalan Zaheer, Hadayat Ullah

{"title":"Sedimentological and provenance analysis of the Cretaceous Moro formation Rakhi Gorge, Eastern Sulaiman Range, Pakistan","authors":"Muhammad Jehangir Khan, S. Ghazi, M. Mehmood, A. Yazdi, A. Naseem, Umair Serwar, Arsalan Zaheer, Hadayat Ullah","doi":"10.30495/IJES.2021.1917721.1564","DOIUrl":"https://doi.org/10.30495/IJES.2021.1917721.1564","url":null,"abstract":"The Cretaceous Moro Formation from the Rakhi Nala section Dera Ghazi Khan has been studied in detail to investigate the Sedimentology and provenance. This paper describes the litho-facies changes, depositional environment, and provenance analysis of the Cretaceous Moro Formation from the Rakhi Nala section, eastern Sulaiman Range. The studied Formation is 110-140 meters thick and consists mainly of fine to coarse-grained sandstone, with minor-siltstone, mudstone (claystone, shale), and limestone. The uppermost beds of the Moro Formation are consist of sandstone with iron types of cement. Twelve lithofacies have been identified based on a petrographic investigation related to the depositional environment of the Moro Formation ranging from deltaic to marine setting (Delta Plain-Delta front). Petrographic analysis of sandstone reveals the presence of quartz both, mono-crystalline and poly-crystalline, less feldspar; heavy minerals like hematite and magnetite, and glauconite were found in negligible amounts. Detrital mineral composition shows that in Moro Formation, the sandstone shows a litharenite. Modal composition of the sandstone from the QFL diagram was Q 66% F 0.3% L 33.7% and that of the QmFLt diagram was QM, 57% F 0.23% L 43.77%. The overall average composition is Q 61.5% F 0.27% L 38.7%. A total of 37 thin-sections are studied for provenance analysis, out of which twenty-seven samples are considered as Litharenite (this shows recycled, or craton interior origin), eight Quartz arenite categories are identified and two samples are fall in the sublitharenites category (Quarts recycled source area).","PeriodicalId":44351,"journal":{"name":"Iranian Journal of Earth Sciences","volume":"13 1","pages":"251-265"},"PeriodicalIF":0.8,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45690346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Separating geochemical anomalies by concentration- area, concentration-perimeter and concentration-number fractal models in Qaen region, East of Iran 用浓度面积、浓度周长和浓度数分形模型分离伊朗东部Qaen地区地球化学异常

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Iranian Journal of Earth Sciences Pub Date : 2021-09-24 DOI: 10.30495/IJES.2021.685385

A. Daya, M. Safari, Amir Hajibabaey, Mahia Manouchehri

引用次数: 1

Raman spectroscopy study of the secondary actinolite in gabbrodiorite intrusive rocks from Varan area, Urumieh-Dokhtar Magmatic Arc, Iran 伊朗乌鲁木齐-多赫塔尔岩浆弧瓦兰地区辉长闪长岩侵入岩中次生放光石的拉曼光谱研究

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Iranian Journal of Earth Sciences Pub Date : 2021-09-24 DOI: 10.30495/IJES.2021.685389

Ghosoun Zheira, B. Rahimzadeh, F. Masoudi

引用次数: 0

Integration of geological and geophysical studies in order to mineral exploration at the Zaveh mineralization area, Khorasan Razavi Province, Iran 整合地质和地球物理研究，以便在伊朗呼罗珊-拉扎维省Zaveh矿化区进行矿产勘探

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Iranian Journal of Earth Sciences Pub Date : 2021-09-24 DOI: 10.30495/IJES.2021.685384

A. M. Shafaroudi, Bahareh Boroziniat, Mohammad Reza Hidarian Shahri

{"title":"Integration of geological and geophysical studies in order to mineral exploration at the Zaveh mineralization area, Khorasan Razavi Province, Iran","authors":"A. M. Shafaroudi, Bahareh Boroziniat, Mohammad Reza Hidarian Shahri","doi":"10.30495/IJES.2021.685384","DOIUrl":"https://doi.org/10.30495/IJES.2021.685384","url":null,"abstract":"The copper deposit of Zaveh lies in the SE of the city of Torbat-e-Heydarieh and in middle of the Khaf-Kashmar-Bardaskan Magmatic Belt (KKBMB) in the Khorasan-e-Razavi Province. The lithology of the area consist of Jurassic and Cretaceous sedimentary rocks and Eocene volcanic units. Ore-formation is controlled by fault activity, representing vein-veinlet style E-W trending, formed within a conglomerate rich in quartz. Primary minerals are chalcopyrite, pyrite and arsenopyrite and secondary minerals contain malachite, azurite chalcocite, bornite, covellite, Cu sulphates, wad (Mn hydroxide), haematite, goethite, jarosite, limonite and (to a lesser extent) chrysocolla. The predominant alteration is silification which is associated with vein ore-formation. The volcanic units host propylitic, sericite, carbonate and silicification alterations. The ore-formation itself represents anomalies of Cu (2.1 % max), As (>1%), Sb (~105 gr/T), Pb (4371 gr/T) and Zn (1.1% max). Induced polarization and electrical resistivity (IP/RS) surveys unveil that the most chargeability anomaly corresponds to center of ore-forming vein and fault zone.The chargeability anomaly extends and amplifies with depth. The most amount of specific electrical resistance has been observed in the quartz-rich conglomerate. Interpretation of IP/RS data reveals that the chargeable source is extending in deeper beds (presumably sulphid ore-formation) which needs to be verified by boring operation. Geophysical surveys are significantly commensurate with field observations, ore-forming and geochemical data. Utilization Geophysical methods in different style of ore-deposits and interpretation of obtained information by means of geological, ore-forming and geochemistry data is considered to be a big step towards subterranean exploration and deposits modeling.","PeriodicalId":44351,"journal":{"name":"Iranian Journal of Earth Sciences","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49340564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of body waves quality factor in the NW Iran, with power spectrum analysis 用功率谱分析测定伊朗西北部体波品质因子

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Iranian Journal of Earth Sciences Pub Date : 2021-09-24 DOI: 10.30495/IJES.2021.685391

Hooman Latifi, Noorbakhsh Merzaei, Reza Heidari

{"title":"Determination of body waves quality factor in the NW Iran, with power spectrum analysis","authors":"Hooman Latifi, Noorbakhsh Merzaei, Reza Heidari","doi":"10.30495/IJES.2021.685391","DOIUrl":"https://doi.org/10.30495/IJES.2021.685391","url":null,"abstract":"As one of the ways to identify seismological characteristics in the region, determining the quality factor of seismic mapping can provide valuable information about inside the earth. This study investigates local site effects as a function of frequency and presents a new relationship for determining the quality factor in northwestern Iran with regard to local site effects. These maps are selected so that their signal-to-noise ratio (SNR) is greater than 5. This study uses the Short-Time Fourier Transform (STFT) method in which a fixed time window and its multiplication by a given signal are used. The coefficients resulting from this transformation are considered as wave amplitudes at any frequency by performing a short-time Fourier transform. The amount of power spectrum decay is used instead of the ground displacement amplitude decay. Since the number of samples will be different at different intervals and this makes it difficult to perform our analysis, the sample mean, presented as the power spectrum, was used. Local site effects and kappa, a function of the path and site effects, were investigated and became the basis of spectral decay calculations. The results of this study were compared with those of the previous work based on conventional and classical methods and the accuracy of the methods was evaluated using standard deviation (SD) values. Finally, the quality factor equations were obtained for the North-South component (N-S) as Q(f)=(78±2)f^((1.37±0.02)), for the East-West component (E-W) as Q(f)=(62±2)f^((1.5±0.03)), and for the vertical component (Z) as Q(f)=(87±2)f^((1.29±0.03)).","PeriodicalId":44351,"journal":{"name":"Iranian Journal of Earth Sciences","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42296633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identification of Geochemical Distribution of REEs Using Factor Analysis and Concentration-Number (C-N) Fractal Modeling in Granitoids, South of Varcheh 1:100000 Sheet 利用因子分析和浓度数（C-N）分形模型识别Varcheh 1:100000片南部花岗岩中稀土元素的地球化学分布

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Iranian Journal of Earth Sciences Pub Date : 2021-09-24 DOI: 10.30495/IJES.2021.685399

M. Arian, A. A. Ardalan, Davoud Pirdadeh Beyranvand, T. Farhadinejad

{"title":"Identification of Geochemical Distribution of REEs Using Factor Analysis and Concentration-Number (C-N) Fractal Modeling in Granitoids, South of Varcheh 1:100000 Sheet","authors":"M. Arian, A. A. Ardalan, Davoud Pirdadeh Beyranvand, T. Farhadinejad","doi":"10.30495/IJES.2021.685399","DOIUrl":"https://doi.org/10.30495/IJES.2021.685399","url":null,"abstract":"The purpose of the present research is delineating geochemical anomaly of REEs in granitoids in south of Varcheh 1:100,000 sheet by the use of C-N fractal model and classical statistical methods. We gathered and studied 59 rock samples for REEs by ICP-MS method in the laboratory of Iran Mineral Processing Research Center (IMPRC). The Concentration–Number (C-N) fractal model was used to delineate elemental thresholds. According to the results, the distribution of elemental concentration for Pr and Sm were divided to three classifications and Ce, La, Nd and Y had five geochemical populations in the area. The classical statistics methods were able to separate three geochemical populations. The results obtained by this study showed that the separation of geochemical anomalies for REEs using C-N fractal model and classical statistics methods yielded to the same results. Meanwhile, the high ratio of LREE to HREE in rock samples as well as high P content, assigns monazite, apatite, and sphene as a possible source of REEs in the study area.","PeriodicalId":44351,"journal":{"name":"Iranian Journal of Earth Sciences","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42256080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Facies Analysis, Depositional Environments and Geochemistry of the Late Ladinian-Early Carnian Ashin Formation, (Central Iran) （伊朗中部）晚拉丹-早卡尼-阿申组的相分析、沉积环境和地球化学

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Iranian Journal of Earth Sciences Pub Date : 2021-09-24 DOI: 10.30495/IJES.2021.685396

Payman Rezaee, M. Khanehbad, Moasoumeh Ezatifar, Sayedeh Akram Jooybari, K. Hosseini

{"title":"Facies Analysis, Depositional Environments and Geochemistry of the Late Ladinian-Early Carnian Ashin Formation, (Central Iran)","authors":"Payman Rezaee, M. Khanehbad, Moasoumeh Ezatifar, Sayedeh Akram Jooybari, K. Hosseini","doi":"10.30495/IJES.2021.685396","DOIUrl":"https://doi.org/10.30495/IJES.2021.685396","url":null,"abstract":"The present study aims to investigate the petrographic, geochemical features, and depositional facies of the Late Triassic Ashin Formation (Nakhlak Group, central Iran). For this purpose, 100 thin sections, and 13 samples of fine-grained sedimentary rocks were analyzed for their petrographic and geochemical characteristics, taken from a 330-m thick section of this formation. The petrographic types identified in this formation include sandstone, siltstone and limestone. This study suggests limestone facies are deposited in upper parts of the distal submarine fan towards the shore, sandstone facies are deposited in the middle part of the distal submarine fan, and the shale facies are deposited in lower parts of the distal submarine fan towards the abyssal plain by turbidity currents. The plotting of petrographic data on ternary diagrams for compositional classification illustrate their composition as litharenites, sub-litharenites, and a few litharenite-feldspathic and shales. Discrete diagrams refer to a tectonic setting of a continental arc complex and the active continental margin. The results of the modal analysis and geochemical data indicate the orogenic re-cycling for these deposits. CIA and CIW indexes indicate moderate weathering of the source area under semi-arid to semi-humid climates.","PeriodicalId":44351,"journal":{"name":"Iranian Journal of Earth Sciences","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42284673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geochemical exploration for Li in regional scale utilizing Staged Factor Analysis (SFA) and Spectrum-Area (S-A) fractal model in north central Iran 利用分级因子分析(SFA)和谱区(S-A)分形模型在伊朗中北部进行区域尺度的锂化探

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Iranian Journal of Earth Sciences Pub Date : 2021-09-24 DOI: 10.30495/IJES.2021.685397

P. Afzal, Farshid Koohzadi, D. Jahani, M. Pourkermani

{"title":"Geochemical exploration for Li in regional scale utilizing Staged Factor Analysis (SFA) and Spectrum-Area (S-A) fractal model in north central Iran","authors":"P. Afzal, Farshid Koohzadi, D. Jahani, M. Pourkermani","doi":"10.30495/IJES.2021.685397","DOIUrl":"https://doi.org/10.30495/IJES.2021.685397","url":null,"abstract":"The main aim of this study was to outline the lithium anomalies by a regional exploration, at an area of 7800 km2, in Semnan province (north central Iran) using the Staged Factor Analysis (SFA) and Spectrum-Area (S-A) fractal model based on stream sediments and rock samples. Results derived via the SFA denote that Li was located in a factor as F2-4 with B, Cs, U and Rb which was utilized for calculation of the threshold values by the S-A method. The F2-4 data were classified by the fractal model for determination of the Li anomalies. Main anomaly for F2-4≥ 1.5 was situated in the SW and northern parts of this region. Furthermore, Li high grades of rock samples were correlated with main F2-4 anomalies. The main anomalies were correlated with geological particulars of Li mineralization types which represent that the main F2-4 anomalies associate with volcanic and tuff units in the SW part, and overlapped with clay minerals in the northern sector of this region. On the other hand, there are proper potential for Li mineralization which is demonstrated by this method.","PeriodicalId":44351,"journal":{"name":"Iranian Journal of Earth Sciences","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49098195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Tectonic geomorphology assessment of neotectonics in the north of Damghan Region, Alborz Mountain Belt, Northern Iran 伊朗北部阿尔布尔兹山脉Damghan地区北部新构造的构造地貌评价

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Iranian Journal of Earth Sciences Pub Date : 2021-09-24 DOI: 10.30495/IJES.2021.685388

Mersana Keshavarz, F. Ghaemi, A. Faghih, M. Ghanadian

{"title":"Tectonic geomorphology assessment of neotectonics in the north of Damghan Region, Alborz Mountain Belt, Northern Iran","authors":"Mersana Keshavarz, F. Ghaemi, A. Faghih, M. Ghanadian","doi":"10.30495/IJES.2021.685388","DOIUrl":"https://doi.org/10.30495/IJES.2021.685388","url":null,"abstract":"In mountain ranges, recent and active tectonics can be viewed as the main factor contributing to rock uplift, their present-day topography being the result of the competition between tectonic and erosional processes. The region coincides with three faults which show signs of activity during the late Quaternary period: The Astaneh, North Damghan, and Damghan faults, which collectively make up the SW section of the left‐lateral Shahrud fault system. In this study we have analyzed morphotectonic and neotectonic indices to evaluate tectonic activity of the study area.Tectonic geomorphological indices that are used in this study are drainage basin based (drainage basin asymmetry factor (Af), Hypsometric integral (Hi)) and mountain front based (mountain-front sinuosity (Smf), valley floor width – valley height ratio (Vf)) which can be useful tools for studying active tectonics. The study area includes pop-up structures that are formed during inverse tectonic activities of Alborz mountain belt. Strike-slip faults and flower structures suggest transpressional tectonic regime at eastern part of Alborz.","PeriodicalId":44351,"journal":{"name":"Iranian Journal of Earth Sciences","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49446484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Application of mineral chemistry in determining magma fertility of the Tarom northern and southern intrusions, NW Iran 矿物化学在确定伊朗西北部Tarom北部和南部侵入体岩浆肥力中的应用

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Iranian Journal of Earth Sciences Pub Date : 2021-09-24 DOI: 10.30495/IJES.2021.685392

N. Yasami, M. Ghaderi, S. H. M. Motlagh, M. Mokhtari

{"title":"Application of mineral chemistry in determining magma fertility of the Tarom northern and southern intrusions, NW Iran","authors":"N. Yasami, M. Ghaderi, S. H. M. Motlagh, M. Mokhtari","doi":"10.30495/IJES.2021.685392","DOIUrl":"https://doi.org/10.30495/IJES.2021.685392","url":null,"abstract":"The Tarom metallogenic belt of the Alborz magmatic belt in NW Iran is characterized by two alignments of intrusion in its northern and southern parts. The northern intrusion is younger than the southern one. Mineral chemistry investigations on the northern and southern intrusions characterize calc-alkaline magmatism. The northern intrusion consists mostly of quartz monzonite, and the southern intrusion comprises 1) gabbro - pyroxene quartz monzodiorite – quartz monzodiorite series and quartz syenite; 2) gabbro-diorite. Electron microprobe chemistries indicate that the northern plagioclases are An22 to An49 (oligoclase to labradorite). Plagioclases from the southern intrusion are An35 to An54 (andesine to labradorite) and gabbro-diorite plagioclases are An65 to An61 (labradorite). All pyroxenes correspond to the Quad (diopside, augite, and clinoenstatite) and crystallized at <2 to 5 kbar and H2O=10%. Formation temperatures of pyroxenes from the northern intrusion are in the range of 1100-1175°C. The northern feldspars show temperatures ~550°C. Formation temperatures for the clinopyroxene and feldspar from the southern intrusion are estimated at 1140-1185°C and 550-600°C, respectively. The Fe-rich biotite minerals from the northern intrusion suggest high oxygen fugacity magma. The northern and southern intrusions formed in an arc-related tectonic setting. The northern magma is sourced from the melting of a mixed mantle-crust in a subduction-related environment. The mineral composition of the northern intrusion implies magma fertility and porphyry mineralization which can be due to its high oxygen fugacity magma and lower crystallization pressure relative to those of the southern intrusion.","PeriodicalId":44351,"journal":{"name":"Iranian Journal of Earth Sciences","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44812489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0