Recent Environment Surrounding Basic Researches
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Mineralogy and Geochemistry Study of Ree Minerals in Host Rocks in Iic Iron Deposit, Bafgh Mineral Area, Central Iran
GEOSABERES: Revista de Estudos Geoeducacionais ISSN: 2178-0463 [email protected] Universidade Federal do Ceará Brasil MINERALOGY AND GEOCHEMISTRY STUDY OF REE MINERALS IN HOST ROCKS IN IIC IRON DEPOSIT, BAFGH MINERAL AREA, CENTRAL IRAN SHIRNAVARD SHIRAZI, MANSOUREH; LOTFI, MOHAMMAD; NEZAFATI, NIMA; GOURABJERIPOUR, ARASH MINERALOGY AND GEOCHEMISTRY STUDY OF REE MINERALS IN HOST ROCKS IN IIC IRON DEPOSIT, BAFGH MINERAL AREA, CENTRAL IRAN GEOSABERES: Revista de Estudos Geoeducacionais, vol. 11, 2020 Universidade Federal do Ceará, Brasil Available in: https://www.redalyc.org/articulo.oa?id=552861694014 DOI: https://doi.org/10.26895/geosaberes.v11i0.909 This work is licensed under Creative Commons Attribution-NonCommercial 4.0 International. PDF generated from XML JATS4R by Redalyc Project academic non-profit, developed under the open access initiative MANSOUREH SHIRNAVARD SHIRAZI, et al. MINERALOGY AND GEOCHEMISTRY STUDY OF REE MINERALS IN HOST ROC... MINERALOGY AND GEOCHEMISTRY STUDY OF REE MINERALS IN HOST ROCKS IN IIC IRON DEPOSIT, BAFGH MINERAL AREA, CENTRAL IRAN ESTUDO DE MINERALOGIA E GEOQUÍMICA DE MINERAIS REE EM ROCHAS HOSPEDEIRAS NO DEPÓSITO DE FERRO DA IIC, ÁREA MINERAL DE BAFGH, IRÃ CENTRAL ESTUDIO DE MINERALOGÍA Y GEOQUÍMICA DE MINERALES REE EN ROCAS HOSPEDANTES DE DEPÓSITOS DE HIERRO DE LA CII, ÁREA MINERAL DE BAFGH, IRÁN CENTRAL MANSOUREH SHIRNAVARD SHIRAZI DOI: https://doi.org/10.26895/geosaberes.v11i0.909 Islamic Azad University, Irán Redalyc: https://www.redalyc.org/articulo.oa? [email protected] id=552861694014 http://orcid.org/0000-0001-9242-0341 -
Explosive Earth
Natural Hazards Explosive Earth One of the most beautiful pictures taken of the Earth is known as the Blue Marble. Taken from space, it is the epitome of serenity. The Earth really looks like a small marble with swirls of blue, white, green and brown, as it floats placidly in the vastness of space. However, the Volcano Variety picture is misleading, for Mother Earth is geologically restless and Based on history of activity often explodes in acts so violent that we call them, natural hazards. Active: These volcanoes are currently erupting, or exhibiting unrest through earthquakes and/or gas emissions. Natural hazards are defined as, “those Volcano Architecture Dormant: These volcanoes are inactive, but have not been so long elements of the physical environment, harmful A volcano constitutes a vent, a pipe, a enough to be declared extinct. to man and caused by forces extraneous to crater, and a cone. him.” The prefix “natural” shows that these Vent: This is the opening through which Extinct: These volcanoes have been exclude phenomenon that are a result of volcanic material is ejected. A central vent inactive in all of recorded history. human action. An event that causes large underlies the summit crater of the volcano. Based on shape numbers of fatalities and/or tremendous loss It is connected to a magma chamber, of property is a “natural disaster.” which is the main storage area for material Volcanic cone: Volcanic cones are among that is finally ejected. the simplest volcano formations. These are Violent Volcano Pipe: This is a passageway through which built up of ejected material around a volcanic One of the most explosively violent events the ejected magma rises to the surface. -
A 100-Year Record of North Pacific Volcanism in an Ice Core from Eclipse Icefield, Yukon Territory, Canada Kaplan Yalcin and Cameron P
University of New Hampshire University of New Hampshire Scholars' Repository Earth Sciences Scholarship Earth Sciences 1-8-2003 A 100-year record of North Pacific olcanismv in an ice core from Eclipse icefield, ukonY Territory, Canada Kaplan Yalcin University of New Hampshire - Main Campus Cameron P. Wake University of New Hampshire - Main Campus, [email protected] Mark S. Germani MVA, Inc. Follow this and additional works at: https://scholars.unh.edu/earthsci_facpub Recommended Citation Yalcin, K., C. P. Wake, and M. Germani, A 100-year record of North Pacific olcanismv in an ice core from Eclipse Icefield, ukonY Territory, Canada, J. Geophys. Res., 108(D1), 4012, doi:10.1029/2002JD002449, 2003. This Article is brought to you for free and open access by the Earth Sciences at University of New Hampshire Scholars' Repository. It has been accepted for inclusion in Earth Sciences Scholarship by an authorized administrator of University of New Hampshire Scholars' Repository. For more information, please contact [email protected]. JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 108, NO. D1, 4012, doi:10.1029/2002JD002449, 2003 A 100-year record of North Pacific volcanism in an ice core from Eclipse Icefield, Yukon Territory, Canada Kaplan Yalcin and Cameron P. Wake Climate Change Research Center, Institute for the Study of Earth, Oceans, and Space (EOS), University of New Hampshire, Durham, New Hampshire, USA Mark S. Germani MicroMaterials Research, Inc., Burr Ridge, Illinois, USA Received 16 April 2002; revised 16 July 2002; accepted 4 August 2002; published 8 January 2003. [1] A record of regionally significant volcanic eruptions in the North Pacific over the last century has been developed using a glaciochemical record from Eclipse Icefield, Yukon Territory, Canada. -
Worksheet: Volcanoes
Worksheet: Volcanoes Find the most spectacular volcanoes in the world! Purpose: This participation and discussion When pressure builds up, eruptions occur. exercise enables students to discover for Gases and rock shoot up through the opening themselves the notable volcanoes of the world and spill over or fill the air with lava fragments. and some basic information about each. Some volcanoes even exist underwater, along the ocean floor or sea bed. Objectives: Students will be able to: > geographically locate 12 notable volcanoes Activity: Follow these steps: > see images of real active volcanoes > identify key features of volcanic activity 1. Print off the: Skills: Students can demonstrate: - Information Required sheet > Researching - Volcano Locations sheet > Classifying - The 12 Volcano sheets for each group > Communicating - The Volcano Teacher Briefing > Observing > Posing questions 2. Spend 20 minutes engaging students in the formation and types of Volcanoes. (Prepare by Time Required: 45 minutes. reading the Teacher Briefing). Group Size: In small groups of 4. 3. Provide each small group with a set of the 12 volcanoes and challenge the students to: Materials/Preparation: Includes: a) locate each volcano > Access to the internet for each group b) identify the height of each volcano > The following 2 teacher guide sheets c) identify the type of each volcano > A printed copy of the 12 volcanoes to locate and research for each group. 4. Review the students discoveries and > A copy of the Volcano Teacher Briefing accuracy in identifying the information for each volcano. Background: Volcanoes form when magma reaches the Earth’s surface, causing eruptions 5. Use the Information and Location sheets to of lava and ash. -
Features of Heat and Mass Transfer Processes Under the Avachinsky Volcano (Kamchatka)
EGU2020-362 https://doi.org/10.5194/egusphere-egu2020-362 EGU General Assembly 2020 © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. Features of heat and mass transfer processes under the Avachinsky volcano (Kamchatka) Grigory Kuznetsov1 and Victor Sharapov1,2 1Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russian Federation, ([email protected]) 2Novosibirsk State University, Novosibirsk, Russian Federation, ([email protected]) We investigated the processes beneath the Avacha volcano using mantle peridotite xenoliths the with the EPMA, electronic microscope and ICP methods and numeric modeling of the mass transfer accounting the melt fluid reactions with peridotites The decompression melting processes in peridotites beneath Avachinsky volcano (Kamchatka) are associated with seismic events. After the reactions with the Si, Ca, Na, K from partial melts associated with the subduction related fluids the spinel and orthopyroxene were melted and essentially clinopyroxene veins were formed. Secondary crystals growth in the mantle xenoliths (with melt and fluid inclusions) are associated possibly with the fluids appeared due to retrograde boiling of the magma chamber beneath the volcano. The processes of sublimation and recrystallization of Avacha harzburgites was investigated at the facility in the Institute of Nuclear Physics (Novosibirsk, Russia), which generates high-density electron beams and makes it possible to obtain boiling ultrabasic and basic liquids and condensates of magmatic gas on the surface of harzburgite. Results of experiments provides a satisfactory explanation for the observed local heterophase alterations within ultramafic rocks that have experienced multistage deformation beneath volcanoes of the Kamchatka volcanic front. Mathematical model of convective heating and metasomatic reactions in harzburgites were modeled using the Selector PC thermodynamic software. -
Oxygen and Iron Isotope Systematics of the Grängesberg Mining District (GMD), Central Sweden
Oxygen and Iron Isotope Systematics Examensarbete vid Institutionen för geovetenskaper of the Grängesberg Mining District ISSN 1650-6553 Nr 251 (GMD), Central Sweden Franz Weis Oxygen and Iron Isotope Systematics of the Grängesberg Mining District Iron is the most important metal for modern industry and Sweden is (GMD), Central Sweden the number one iron producer in Europe. The main sources for iron ore in Sweden are the apatite-iron oxide deposits of the “Kiruna-type”, named after the iconic Kiruna ore deposit in Northern Sweden. The genesis of this ore type is, however, not fully understood and various schools of thought exist, being broadly divided into “ortho-magmatic” versus the “hydrothermal replacement” approaches. This study focuses on the origin of apatite-iron oxide ore of the Grängesberg Mining District (GMD) in Central Sweden, one of the largest iron reserves in Sweden, employing oxygen and iron isotope analyses on Franz Weis massive, vein and disseminated GMD magnetite, quartz and meta- volcanic host rocks. As a reference, oxygen and iron isotopes of magnetites from other Swedish and international iron ores as well as from various international volcanic materials were also analysed. These additional samples included both “ortho-magmatic” and “hydrothermal” magnetites and thus represent a basis for a comparative analysis with the GMD ore. The combined data and the derived temperatures support a scenario that is consistent with the GMD apatite-iron oxides having originated dominantly (ca. 87 %) through ortho-magmatic processes with magnetite crystallisation from oxide-rich intermediate magmas and magmatic fluids at temperatures between of 600 °C to 900 °C. -