Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Application of Airborne Geophysical and ASTER Data for Hydrothermal Alteration Mapping in the Sar-Kuh Porphyry Copper Area, Kerman Province, Iran  [PDF]
Mehdi Honarmand
Open Journal of Geology (OJG) , 2016, DOI: 10.4236/ojg.2016.610092
Abstract: Known deposits are appropriate sites for investigating significant exploratory keys that could be helpful in mineral exploration in corresponding regions or similar areas. This study was performed to delineate hydrothermal alteration model and some geophysical characteristics of the SarKuh porphyry copper deposit located within the southern part of the central Iranian Cenozoic magmatic belt (CICMB). Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) images have been used to produce hydrothermal alteration map using a fractal-aided spectral angle mapper (SAM) method. Airborne data were used to study magnetic-radiometric properties of the deposit. Image processing of ASTER images and laboratory studies proved the presence of two types of phyllic ale ration called intense and weak phyllic based on abundance of sericite mineral. It realized that radiometric anomalies of 40K, eTh and eU are limited to boundary of phyllic zone. Radiometric ratios e.g. eTh/40K were good enough to enhance phyllic zone.
Alteration Extracting Based on Spectral Match Filter(SMF)

GAN Fu ping,WANG Run sheng,MA Ai nai,ZHANG Zong gui,

中国图象图形学报 , 2003,
Abstract: It is very important and difficult to extract geological altered information using remote sensing data. The method of Spectral Match Filter(SMF) in this paper was developed according to Ref. . The altered mineral spectra selected from standard spectral database were thought of as reference spectral vector in 0 mean domain. The filtering detector is established owing to the match degree between very one pixel in multiple band images and reference spectral vector in 0 mean domains. The altered information are segmented using both SMF and suitable threshold processing. Both a gold deposit at Dongtianshan of Xinjiang and a porphyry copper belt at Gangdese of Xizang are selected as test areas. Some altered minerals are extracted from ETM + data using SMF. The result shows that the locations of some altered minerals or altered minerals' composition are consistent with mineral deposit or ore spot. And the result also suggests the method be in good generality.
Application study of multi-spectral ASTER data for determination of ETM remote sensing anomaly property: Taking Wulonggou region of eastern KunLun mountain range as example


岩石学报 , 2009,
Abstract: The geological basis and the spectral presupposition for the alteration anomalies, as the new parameter for the prediction of the mineral resources, are discussed. On the basis of deposit geology and spectral characteristics of altered minerals a table for extraction of remote sensing anomaly and geological interpretation was constructed. The multi-spectral remote sensing techniques for extraction of ETM (Enhanced Thematic Mapper) anomalies were already popularized for the whole country. The ASTER (Advanced Space-borne Thermal Emission and Reflection radiometer) data can play important auxiliary role for ETM data in 3 aspects: 1. for determination of the mineralization types for several types of deposits, using the added new SWIR channels; 2. for determination of several rock types, using the added TIR channels; 3. for resolving several problems with ETM RS anomaly due to the big width of the 7th channel. This work shows the study results of ASTER data for Wulonggou region of eastern Kunlun mountain range in solving of the problems with determination of the property of the ETM RS anomaly.
Vaquero, M. P.
Grasas y Aceites , 1998,
Abstract: The possible changes in the mineral composition of food during frying could be the consequence of losses by leaching, or changes in concentrations caused by exchanges between the food and culinary fat of other compounds. The net result depends on the type of food, the frying fat used and the frying process. Moreover, the modifications that frying produces in other nutrients could indirectly affect the availability of dietary minerals. The most outstanding ones are those that can take place in the fat or in the protein. With respect to the interactions between frying oils and minerals, we have recent knowledge concerning the effects of consuming vegetable oils used in repeated fryings of potatoes without turnover, on the nutritive utilization of dietary minerals. The experiments have been carried out in pregnant and growing rats, which consumed diets containing, as a sole source of fat, the testing frying oils or unused oils. It seems that the consumption of various frying oils, with a polar compound content lower or close to the maximum limit of 25% accepted for human consumption, does not alter the absorption and metabolism of calcium, phosphorous, iron or copper. Magnesium absorption from diets containing frying oils tends to increase but the urinary excretion of this element increases, resulting imperceptible the variations in the magnesium balance. The urinary excretion of Zn also increased although its balance remained unchanged. Different studies referring to the effects of consuming fried fatty fish on mineral bioavailability will also be presented. On one hand, frying can cause structural changes in fish protein, which are associated with an increase in iron absorption and a decrease in body zinc retention. The nutritive utilization of other elements such as magnesium, calcium and copper seems to be unaffected. On the other hand; it has been described that an excess of fish fatty acids in the diet produces iron depletion, but when fatty fish is fried in olive oil the quality of the fish oil improves, enhancing the nutritive utilization of iron and other dietary minerals.
The Extraction of Wall Rock Alteration Information Related to Gold Deposits in Harqin Banner Area of Eastern Inner Mongolia by Using ETM+ Remote Sensing Technique

SHI Wei,LIU Jian-ming,WANG Run-sheng,

地球学报 , 2007,
Abstract: Lots of gold deposits exist in Harqin Banner area within the eastern part of Inner Mongolia. Using the ETM+ remote sensing technique combined with field work,the authors extracted and analyzed the wall rock alteration and mineralization information of gold deposits in this area. The results show that the distribution of gold deposits in this area are obviously controlled by regional tectonics, and alterations related to gold mineralization are composed mainly of silicification and ferruginous minerals, with minor clay minerals. Three ore-forming belts are developed in this area, consisting of two EW-trending belts and one NE-SW-trending belt. The favorable area for gold mineralization lies in the southeast of the Harqin Banner area,and rich gold ore bodies might exist in the intersections between EW-trending faults and NE-SW-trending faults, where wall rock alterations are relatively intense. It is shown that the remote sensing information of mineralization and alteration can clearly reveal the potential areas of gold mineralization, and hence has some guiding significance in the exploration of gold deposits.
Application of Different Image Processing Techniques on Aster and ETM+ Images for Exploration of Hydrothermal Alteration Associated with Copper Mineralizations Mapping Kehdolan Area (Eastern Azarbaijan Province-Iran)  [PDF]
Golchin Hajibapir, Mohammad Lotfi, Afshar Zia Zarifi, Nima Nezafati
Open Journal of Geology (OJG) , 2014, DOI: 10.4236/ojg.2014.411043
Abstract: The Kehdolan area is located at 20 kilometers to the south-east of Dozdozan Town (Eastern Azarbaijan Province). According to structural geology, volconic rocks are situated in Alborz-Azarbyjan zone, and faults are observed in the same direction to this system with SE-NW trend. The results show that kaolinite alteration trend with Argilic and propylitic veins is the same direction with SW-NE faults in this area. Therefore, these faults with these trends can be considered as the mineralization control for determination of the alterations. Different image processing techniques, such as false color composite (FCC), band ratios, color ratio composite (CRC), principal component analysis (PCA), Crosta technique, supervised spectral angle mapping (SAM), are used for identification of the alteration zones associated with copper mineralization. In this project ASTER data are process and spectral analysis to fit for recognizing intensity and kind of argillic, propylitic, philic, and ETM+ data which are process and to fit for iron oxide and relation to metal mineralization of the area. For recognizing different alterations of the study area, some chemical and mineralogical analysis data from the samples showed that ASTER data and ETM+ data were capable of hydrothermal alteration mapping with copper mineralization. Copper mineralization in the region is in agreement with argillic alteration. SW-NE trending faults controlled the mineralization process.
БАР’ РН ВЛАСТИВОСТ ПРИРОДНИХ ГЛИНИСТИХ М НЕРАЛ В Barrier properties of natural clay minerals Барьерные свойства природных глинистых минералов  [cached]
Т.В. Дудар,С.П. Бугера,В.М. Кадошн?ков,Б.П. Злобенко
Proceedings of National Aviation University , 2009,
Abstract: Розглянуто особливост сорбц урану на глинистих м нералах на приклад бентон ту та палигорськ ту з Черкаського родовища, а також використання глин як матер алу для бар’ р в. Clay minerals is a perfect material for geochemical barrier due to their high water resistivity, plasticity, high sorbing capacity, well developed surface and cheapness in extraction and processing. This work studies the peculiarities of uranium sorbtion on clay minerals on the example of bentonite and palygorskite clay from Cherkassy deposit, and clay usage as a barrier material. Рассмотрены особенности сорбции урана на глинистых минералах на примере бентонита и палыгорскит из Черкасского месторождения, а также использование глин в качестве материала для барьеров.
Petrogenesis and Metallogenesis of Malek Siah Kuh Adakite-Like Rocks and Associated Hydrothermal Mineralization (Sistan Area, Iran)  [PDF]
Mohsen Javan Khosh Kholgh, Morteza Razmara, Mohammad Ali Arian
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.711112
Abstract: The granitoids-diroretic complex and associated volcanic suits of Malek Siah Kuh (eastern Iran) were examined by RS, XRD, XRF, AAS and ICP-MS methods. The Multispectral data were used for differentiating of lithological units, main alterations, structural trends, and hydrothermally altered minerals. Based on the results of remote sensing, field studies and petrographic data, the complex classified into three main groups: 1) mafic unit (gabbro-basalt), 2) intermediate rocks (diorite-andesite suite) and 3) felsic unit (granitoide rocks). The complex is characterized by high Al2O3 and Sr contents as well as high Sr/Y and La/Yb ratios, while low in Y and Yb contents. The geochemical characteristics of these rocks indicate that they are similar to adakite like rocks. The complex is high calc-alkaline to shoshonitic nature. The results indicated derivation from similar silicate melt source followed by differentiation and assimilation of crustal rocks. Based on set of petrological and geochemical relations, 3 distinct stages of mineralization process can be recognized. 1) It is differentiation during magma evolution as well as metal enrichment and subsolidus leaching by hot fluids. 2) It occurred by ascending of the gas-rich magma and release of S and As. 3) It was accompanied by hydrothermal activities leading to the generation of sulfidation and associated polymetallic (Cu, Au, Fe) mineralization.
ASTER Image Alteration Minerals Information Extraction Based on Different Lithology Backgrounds

于 岩,李建国,陈圣波,高学生,路 鹏 ,黄 爽,张晨曦
Yu Yan'
, Li Jianguo, Chen Shengbo'· , Gao Xuesheng, Lu Peng'' , Huang Shuang', Zhang Chenxi'

地球科学(中国地质大学学报) , 2015, DOI: 10.3799/dqkx.2015.123
Abstract: 为了减少由于不同岩性的反射率值差异而造成提取到错误的蚀变信息,采用先进星载热发射和反射辐射仪(advanced spacebornethermalemissionandreflectionradiometer,ASTER)数据,以内蒙古昌特敖包地区为研究区,先开展岩性分区,再利 用主成分分析和阈值分割的方法提取矿化蚀变信息,并进行了方法对比与野外验证工作.褐铁矿化蚀变信息验证点共12个, 不分区直接提取的信息有6个与验证点吻合,分区后提取的信息有8个点与验证点吻合;绿泥石化蚀变信息验证点共5个,不 分区直接提取的信息有2个与验证点吻合,分区后提取的信息有4个点与验证点吻合.研究结果表明,针对不同岩性存在的反 射率差异,造成高背景值地区提取出较多的非矿致异常信息,而低背景值地区弱信息被噪声淹没的现象,该方法能够减少不 同岩性产生的反射率差异
In order to reduce the incorrect alteration information extraction caused by the different reflectance values in the dif- ferentlitho1ogies, this paper exp1ores alteration minerals information extraction by using ASTER(advanced spaceborne ther- ma1 emission and reflection radiometer) data, and taking Mongolia Changte'aobao region of Inner Mongolia as the study area. The alteration information has been extracted by segmenting the differentlitho1ogies firstly, and conducting the principa1 com- ponent analysis and threshold segmentation methods. It is found that there are12 limonitization information verification points, of which6 points match the information extracted directly without segmenting and8 points match after segmenting; In addi- tion, there are5 Ch1oritization information verification points, of which2 match directly and4 after segmenting respectively. The results show that the reflectivity of differentlitho1ogies is different, resulting in extracting extra information in the high value background region and weak information submerged by noise in the area of 1ow background values, and this method can effectively reduce the reflectance differences in differentlitho1ogies
The Unique Folding Style in the Zagros Simply Folded Belt, the Kuh-e Qazi Anticline, South Iran  [PDF]
Zahra Maleki
Open Journal of Geology (OJG) , 2015, DOI: 10.4236/ojg.2015.57047
Abstract: The study area is located in the Zagros Simply Folded Belt of Iran and in the interior Fars sub-basin (175 km from Persian Gulf). The Zagros fold-thrust belt is home to one of the largest petroleum producing reservoirs in the world. Structures in this area have complications and the study anticline has unique structures in the Fars region. In the study area, the Kuh-e Qazi anticline due to special fold style and rotation toward Northeast is the unique structure between anticlines of the Zagros belt. This anticline is fault bend fold and plunge of the anticline in eastern part rotated toward Northeast along with the Nezamabad fault trend. In this area, the Kuh-e Qazi anticline has asymmetric structures and some faults such as the Nezamabad and the Sarvestan strike slip fault effect on this anticline. The geometry of anticlines in the Zagros fold-thrust belt is affected by the type of deformation and mechanical behavior of stratigraphic units specially detachment units. The purpose of this research is to determine of folding pattern of the Kuh-e Qazi anticline and define structural features affected on them in the study area. This paper presents a part of the results of a regional study of the Fars province in the Zagros Simply Folded Belt, based on original fieldwork, satellite images, structural sections, geological maps and well data. Also, we use some software as Global Mapper and Tectonics FP for preparing some data.?Based on the research, which have been done, the boundary between ductile and frictional substrates causes rotation as a result of lateral, along-strike migration of the ductile substrate. The ductile or viscose layer in the study area is Hormuz Series. Due to lack or thinning of Hormuz salt over the Gavbandi basement high and in the eastern side of the Nezamabad basement fault, causes translation of strain and anticlockwise rotation in Southeast of the Kuh-e Qazi anticline toward Northwest unlike foreland basin due to the Nezamabad fault activity. This style between all of the anticlines in the study area is unique that rotates unlike foreland basin. In addition, influence on anticlockwise rotation, extensional stress has been created and then salt dome cropping out in Southeast of the Kuh-Qazi anticline. One of the best evidence for effect of extensional stress is triangular facets in this part of the study anticline. Based on folding analysis (geometry of axial plane and fold orientation), it is clearly confirmed that the translation of strain and anticlockwise rotation in Southeast of the Kuh-e Qazi anticline toward Northwest
Page 1 /100
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.