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Equation Of State For Natural Almandine, Spessartine, Pyrope Garnet: Implications For Quartz-In-Garnet Elastic Geobarometry, Suzanne R. Mulligan, Elissaios Stavrou, Stella Chariton, Oliver Tschauner, Ashkan Salamat, Michael Wells, Alexander G. Smith, Thomas D. Hoisch, Vitali Prakapenka 2021 University of Nevada, Las Vegas

Equation Of State For Natural Almandine, Spessartine, Pyrope Garnet: Implications For Quartz-In-Garnet Elastic Geobarometry, Suzanne R. Mulligan, Elissaios Stavrou, Stella Chariton, Oliver Tschauner, Ashkan Salamat, Michael Wells, Alexander G. Smith, Thomas D. Hoisch, Vitali Prakapenka

Geoscience Faculty Publications

The equation of state (EoS) of a natural almandine74spessartine13pyrope10grossular3 garnet of a typical composition found in metamorphic rocks in Earth’s crust was obtained using single crystal synchrotron X-ray diffraction under isothermal room temperature compression. A third-order Birch-Murnaghan EoS was fitted to P-V data and the results are compared with published EoS for iron, manganese, magnesium, and calcium garnet compositional end-members. This comparison reveals that ideal solid solution mixing can reproduce the EoS for this intermediate composition of garnet. Additionally, this new EoS was used to calculate geobarometry on a garnet sample from the same rock, which was collected from ...


Bat Guano Minerals And Mineralization Processes In Chameau Cave, Eastern Morocco, Philippe Audra, Vasile Heresanu, Lionel Barriquand, Mohamed El Kadiri Boutchich, Stephane Jaillet, Edwige Pons-Branchu, Pavel Bosak, Hai Cheng, R Lawrence Edwards, Michel Renda 2021 University of Nice Sophia Antipolis (France)

Bat Guano Minerals And Mineralization Processes In Chameau Cave, Eastern Morocco, Philippe Audra, Vasile Heresanu, Lionel Barriquand, Mohamed El Kadiri Boutchich, Stephane Jaillet, Edwige Pons-Branchu, Pavel Bosak, Hai Cheng, R Lawrence Edwards, Michel Renda

International Journal of Speleology

The decay of bat guano deposits in caves produces mineral accumulations, mainly phosphates and secondary sulfates. Chameau Cave, Eastern Morocco, is located in the semi-arid Bni Snassen Mountains. It is composed of semi-active and dry passages, and is featured by strong condensation-corrosion on the walls, presence of fluvial sediments, and old corroded flowstones. Due to forced and convective airflow, the cave is generally very dry, with some damp sites related to condensation. Samples collected on the surface of different passages and along two sediment profiles yielded minerals related to bat guano decay. On recent or fresh guano, precursor minerals correspond ...


The Lavrion Mines: A Unique Site Of Geological And Mineralogical Heritage, Panagiotis Voudouris, Vasilios Melfos, Constantinos Mavrogonatos, Adonis Photiades, Eugenia Moraiti, Branko Rieck, Uwe Kolitsch, Alexandre Tarantola, Christophe Scheffer, Denis Morin, Olivier Vanderhaeghe, Paul G. Spry, James Ross, Konstantinos Soukis, Markos Vaxevanopoulos, Igor V. Pekov, Nikita V. Chukanov, Andreas Magganas, Marianna Kati, Athanasios Katerinopoulos, Stefanos Zaimis 2021 National and Kapodistrian University of Athens

The Lavrion Mines: A Unique Site Of Geological And Mineralogical Heritage, Panagiotis Voudouris, Vasilios Melfos, Constantinos Mavrogonatos, Adonis Photiades, Eugenia Moraiti, Branko Rieck, Uwe Kolitsch, Alexandre Tarantola, Christophe Scheffer, Denis Morin, Olivier Vanderhaeghe, Paul G. Spry, James Ross, Konstantinos Soukis, Markos Vaxevanopoulos, Igor V. Pekov, Nikita V. Chukanov, Andreas Magganas, Marianna Kati, Athanasios Katerinopoulos, Stefanos Zaimis

Geological and Atmospheric Sciences Publications

The Lavrion area corresponds to the western part of the Attic-Cycladic metamorphic belt, in the back-arc region of the active Hellenic subduction zone. Between the Eocene and the Miocene, metamorphic rocks (mainly marbles and schists) underwent several stages of metamorphism and deformation due to collision and collapse of the Cycladic belt. Exhumation during the Miocene was accommodated by the movement of a large-scale detachment fault system, which also enhanced emplacement of magmatic rocks, leading to the formation of the famous Lavrion silver deposits. The area around the mines shows the stacking of nappes, with ore deposition mainly localized within the ...


The Geology, Geochemistry, And Origin Of The Porphyry Cu-Au-(Mo) System At Vathi, Serbo-Macedonian Massif, Greece, Christos L. Stergiou, Vasilios Melfos, Panagiotis Voudouris, Paul G. Spry, Lambrini Papadopoulou, Alexandros Chatzipetros, Katerina Giouri, Constantinos Mavrogonatos, Anestis Filippidis 2021 University of Thessaloniki

The Geology, Geochemistry, And Origin Of The Porphyry Cu-Au-(Mo) System At Vathi, Serbo-Macedonian Massif, Greece, Christos L. Stergiou, Vasilios Melfos, Panagiotis Voudouris, Paul G. Spry, Lambrini Papadopoulou, Alexandros Chatzipetros, Katerina Giouri, Constantinos Mavrogonatos, Anestis Filippidis

Geological and Atmospheric Sciences Publications

The Vathi porphyry Cu-Au ± Mo mineralization is located in the Serbo-Macedonian metallogenic province of the Western Tethyan Metallogenic Belt. It is mainly hosted by a latite and is genetically associated with a quartz monzonite intrusion, which intruded the basement rocks of the Vertiskos Unit and the latite, 18 to 17 Ma ago. A phreatic breccia crosscuts the latite. The quartz monzonite was affected by potassic alteration, whereas the latite was subjected to local propylitic alteration. Both styles of alteration were subsequently overprinted by intense sericitic alteration. M-type and A-type veins are spatially associated with potassic alteration, whereas D-type veins are ...


Analysis Of Water Concentration Formed Within Deformed Synthetic Quartz Crystals, Andrew Steward 2021 The University of Akron

Analysis Of Water Concentration Formed Within Deformed Synthetic Quartz Crystals, Andrew Steward

Williams Honors College, Honors Research Projects

Analyzing the strength of synthetic quartz is essential to understanding the strength of natural milky quartz, which likely controls the strength of Earth’s continental crust. Synthetic quartz is sometimes used for deformation experiments because it has a homogenous water distribution unlike natural milky quartz. The purpose of this study is to determine if annealing synthetic quartz at T = 600°C will convert the water in synthetic quartz to free water, like milky quartz, but with little water loss. Following two annealing experiments at Texas A&M University, I performed four annealing experiments to measure the water content of five ...


The Effects Of Heterogeneities And Syn-Deformational Partial Melting On Rock Strength Evolution And Melt Migration, Nicole Wagner 2021 The University of Akron

The Effects Of Heterogeneities And Syn-Deformational Partial Melting On Rock Strength Evolution And Melt Migration, Nicole Wagner

Williams Honors College, Honors Research Projects

In nature, the segregation of granitic melts at the source may be controlled by fabric and compositional heterogeneities in the source rock, such as foliation and lineation. To investigate the influence of foliation/lineation orientation and composition on rock strength and melt interconnectivity, I performed a series of experiments on cores of a fine-grained gneiss (Gneiss Minuti) and a fine-grained muscovite-bearing quartzite (Moine Thrust quartzite). These rocks were cored at six primary orientations parallel, 45 degrees, and perpendicular to the foliation and lineation and were deformed at a constant temperature of 900°C, pressure of ~2 GPa, and strain rate ...


Structure Analysis Of Natural Wangdaodeite—Linbo3-Type Fetio3, Oliver Tschauner, Chi Ma, Matthew G. Newville, Antonio Lanzirotti 2020 University of Nevada, Las Vegas

Structure Analysis Of Natural Wangdaodeite—Linbo3-Type Fetio3, Oliver Tschauner, Chi Ma, Matthew G. Newville, Antonio Lanzirotti

Geoscience Faculty Publications

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This paper reports the first structure refinement of natural wangdaodeite, LiNbO3-type FeTiO3 from the Ries impact structure. Wangdaodeite occurs together with recrystallized ilmenite clasts in shock melt veins which have experienced peak shock pressures of between 17 and 22 GPa. Comparison of natural and synthetic wangdaodeite points toward a correlation between the distortion of ferrate-and titanate-polyhedra and the c/a ratio of the unit cell. The Raman spectrum of wangdaodeite is calculated based on the refined structure. Comparison to the reported spectrum of the type-material shows that the Raman peak at 738 ...


Framework Grain Composition And Texture Of The Wedington Sandstone Member, Fayetteville Shale, As A Provenance And Sediment Dispersal Indicator For Clastic Depositional Systems Across The Northern Arkansas Structural Platform During The Late Mississippian, Tanner Wayne Corbin 2020 University of Arkansas, Fayetteville

Framework Grain Composition And Texture Of The Wedington Sandstone Member, Fayetteville Shale, As A Provenance And Sediment Dispersal Indicator For Clastic Depositional Systems Across The Northern Arkansas Structural Platform During The Late Mississippian, Tanner Wayne Corbin

Theses and Dissertations

The Wedington Sandstone Member of the Fayetteville Shale is a constructive delta complex in the Chesterian section of the Late Mississippian record in Northwest Arkansas. A comparative analysis of framework grain composition between the Wedington and two other stratigraphically proximal Carboniferous sandstones: the Batesville Sandstone (older) and the Basal Atoka-Spiro Sandstone (younger) has addressed three questions: 1) Is there similarity in sediment provenance for the three sandstones? 2) Do these three sandstone units have a similar sediment dispersal vector? 3) What are likely sediment source terrains for the Wedington Sandstone? Wedington samples overwhelmingly plot as quartzarenites with fewer samples plotting ...


Multi-Stage Introduction Of Precious And Critical Metals In Pyrite: A Case Study From The Konos Hill And Pagoni Rachi Porphyry/Epithermal Prospects, Ne Greece, Constantinos Mavrogonatos, Panagiotis Voudouris, Federica Zaccarini, Stephan Klemme, Jasper Berndt, Alexandre Tarantola, Vasilios Melfos, Paul G. Spry 2020 National and Kapodistrian University of Athens

Multi-Stage Introduction Of Precious And Critical Metals In Pyrite: A Case Study From The Konos Hill And Pagoni Rachi Porphyry/Epithermal Prospects, Ne Greece, Constantinos Mavrogonatos, Panagiotis Voudouris, Federica Zaccarini, Stephan Klemme, Jasper Berndt, Alexandre Tarantola, Vasilios Melfos, Paul G. Spry

Geological and Atmospheric Sciences Publications

The Konos Hill and Pagoni Rachi porphyry-epithermal prospects in northeastern Greece are characterized by abundant pyrite that displays important textural and geochemical variations between the various ore stages. It is commonly fine-grained and anhedral in the porphyry-related mineralization (M- and D-type veins), while it forms idiomorphic, medium- to coarse-grained crystals in the late, epithermal style veins (E-type). Porphyry-style pyrite from both prospects is characterized by an enrichment in Co, Se, Cu, and minor Zn, and a depletion in other trace elements, like Bi, Mo, Ag, etc. Pyrite in epithermal-style mineralization is mostly characterized by the presence of As, Bi, Pb ...


Comparative Geochemical Analysis Of Ordovician And Mississippian Cherts In Relation To The Northern Arkansas And The Tri-State Mississippi Valley-Type Ore Districts, Jonathan T. Chick 2020 University of Arkansas, Fayetteville

Comparative Geochemical Analysis Of Ordovician And Mississippian Cherts In Relation To The Northern Arkansas And The Tri-State Mississippi Valley-Type Ore Districts, Jonathan T. Chick

Theses and Dissertations

It has been hypothesized that Ordovician, Mississippian, and younger carbonate and clastic formations found within the Ouachita Basin of west-central Arkansas and northward onto the Ozark Dome have experienced interaction with hydrothermal fluids due to tectonic forces produced by the Ouachita Orogeny. Lead (Pb) isotope analyses and resulting values produced through previous and concurrent geochemical studies of several formations indicate that the Mississippi Valley-type (MVT) ores were produced from a mixing and cooling of these sedimentary basinal brines by meteoric or connate waters. Reduction of sulfate to sulfide is one of the possible mechanisms by which MVT ore precipitation may ...


Structure-Strength Relations Of Distinct Mon Phases From First-Principles Calculations, Cheng Lu, Changfeng Chen 2020 China University of Geosciences

Structure-Strength Relations Of Distinct Mon Phases From First-Principles Calculations, Cheng Lu, Changfeng Chen

Physics & Astronomy Faculty Publications

Molybdenum mononitrides (MoN) exhibit superior strength and hardness among the large class of transition-metal light-element compounds, but the underlying atomistic mechanisms for their outstanding mechanical properties and the variations of those properties among various MoN phases adopting different crystal structures remain largely unexplored and require further investigation. Here we report first-principles calculations that examine the stress-strain relations of these materials, and systematically compare results under pure and indentation shear deformations. In particular, we examine the distinct bonding structures and the associated mechanical properties in four different crystal phases of MoN that have been experimentally synthesized and stabilized under various physical ...


Indentation-Strain Stiffening In Tungsten Nitrides: Mechanisms And Implications, Cheng Lu, Changfeng Chen 2020 China University of Geosciences

Indentation-Strain Stiffening In Tungsten Nitrides: Mechanisms And Implications, Cheng Lu, Changfeng Chen

Physics & Astronomy Faculty Publications

We report on a systematic computational study of ideal strengths, i.e., the lowest stresses needed to destabilize a perfect crystal under a variety of loading conditions for six stable and metastable tungsten nitrides identified by advanced crystal structure search algorithms. We employ first-principles calculations to determine stress-strain relations and examine the corresponding atomistic bonding changes for a microscopic understanding of the structural deformation modes. The obtained results show that, in stark contrast to many previously studied transition-metal borides, carbides, and also most nitrides, the tungsten nitrides exhibit surprisingly broad and common patterns of strain-stiffening effects under indentation strains. These ...


Mineralogical Constraints On The Potassic And Sodic-Calcic Hydrothermal Alteration And Vein-Type Mineralization Of The Maronia Porphyry Cu-Mo ± Re ± Au Deposit In Ne Greece, Vasilios Melfos, Panagiotis Voudouris, Margarita Melfou, Matías G. Sánchez, Lambrini Papadopoulou, Anestis Filippidis, Paul G. Spry, Anna Schaarschmidt, Reiner Klemd, Karsten M. Haase, Alexandre Tarantola, Constantinos Mavrogonatos 2020 Aristotle University of Thessaloniki

Mineralogical Constraints On The Potassic And Sodic-Calcic Hydrothermal Alteration And Vein-Type Mineralization Of The Maronia Porphyry Cu-Mo ± Re ± Au Deposit In Ne Greece, Vasilios Melfos, Panagiotis Voudouris, Margarita Melfou, Matías G. Sánchez, Lambrini Papadopoulou, Anestis Filippidis, Paul G. Spry, Anna Schaarschmidt, Reiner Klemd, Karsten M. Haase, Alexandre Tarantola, Constantinos Mavrogonatos

Geological and Atmospheric Sciences Publications

The Maronia Cu-Mo ± Re ± Au deposit is spatially related to a microgranite porphyry that intruded an Oligocene monzonite along the Mesozoic Circum-Rhodope belt in Thrace, NE Greece. The magmatic rocks and associated metallic mineralization show plastic and cataclastic features at the south-eastern margin of the deposit that implies emplacement at the ductile-brittle transition, adjacent to a shear zone at the footwall of the Maronia detachment fault. The conversion from ductile to brittle deformation caused a rapid upward magmatic fluid flow and increased the volume of water that interacted with the host rocks through high permeable zones, which produced extensive zones ...


Seismic Visibility Of Eclogite In The Earth’S Upper Mantle – Implications From High Pressure-Temperature Single-Crystal Elastic Properties Of Omphacite, Ming Hao, Jin S. Zhang, Wen-Yi Zhou, Qin Wang 2020 University of New Mexico

Seismic Visibility Of Eclogite In The Earth’S Upper Mantle – Implications From High Pressure-Temperature Single-Crystal Elastic Properties Of Omphacite, Ming Hao, Jin S. Zhang, Wen-Yi Zhou, Qin Wang

Earth and Planetary Sciences Faculty and Staff Publications

Eclogite, constituting the subducted crust, is one of the most important geochemical and geophysical heterogeneities in the Earth’s mantle. As the dominant anisotropic phase in eclogite, precise high pressure-temperature single-crystal elastic properties of omphacite provides the basis for detecting eclogite in the Earth’s upper mantle. In this study, we measured the single-crystal elastic moduli of omphacite up to 18 GPa and 700 K using Brillouin spectroscopy. A least-squares fit to a third-order finite strain equation of state yields KS0’=4.5(1), G0’=1.53(5), ∂KS0/∂T=-0.029(5) GPa/K, ∂G0 ...


Analysis Of Deformation Mechanisms That Formed The Shear Zones Found In The Scituate Granite, Rhode Island, Usa, Jacob Waller 2020 The University of Akron

Analysis Of Deformation Mechanisms That Formed The Shear Zones Found In The Scituate Granite, Rhode Island, Usa, Jacob Waller

Williams Honors College, Honors Research Projects

The rheology of the ductile middle and lower crust affects the rate and intensity of aftershocks following major seismic events. This ductile deformation in the middle crust is commonly localized in narrow shear zones, which requires a process that causes strain weakening to operate in order to form these shear zones. In order to determine the mechanisms that cause strain localization in a common crustal rock, microstructures were analyzed in and around a shear zone found in a granite, Scituate, RI, deformed during the Alleghenian orogeny. Evolution of shear zone growth was observed through optical and scanning electron microscope (SEM ...


Trace Elements In Magnetite From The Pagoni Rachi Porphyry Prospect, Ne Greece: Implications For Ore Genesis And Exploration, Constantinos Mavrogonatos, Panagiotis Voudouris, Jasper Berndt, Stephan Klemme, Federica Zaccarini, Paul G. Spry, Vasilios Melfos, Alexandre Tarantola, Manuel Keith, Reiner Klemd, Karsten Haase 2019 National and Kapodistrian University of Athens

Trace Elements In Magnetite From The Pagoni Rachi Porphyry Prospect, Ne Greece: Implications For Ore Genesis And Exploration, Constantinos Mavrogonatos, Panagiotis Voudouris, Jasper Berndt, Stephan Klemme, Federica Zaccarini, Paul G. Spry, Vasilios Melfos, Alexandre Tarantola, Manuel Keith, Reiner Klemd, Karsten Haase

Geological and Atmospheric Sciences Publications

Magnetite is a common accessory phase in various types of ore deposits. Its trace element content has proven to have critical implications regarding petrogenesis and as guides in the exploration for ore deposits in general. In this study we use LA-ICP-MS (laser ablation-inductively coupled plasma-mass spectrometry) analyses of trace elements to chemically characterize magnetite from the Pagoni Rachi Cu–Mo–Re–Au porphyry-style prospect, Thrace, northern Greece. Igneous magnetite mostly occurs as euhedral grains, which are commonly replaced by hematite in fresh to propylitic-altered granodiorite porphyry, whereas, hydrothermal magnetite forms narrow veinlets or is disseminated in sodic/potassic-calcic altered (albite ...


The Effects Of Amphibolite Facies Metamorphism On The Trace Element Composition Of Pyrite And Pyrrhotite In The Cambrian Nairne Pyrite Member, Kanmantoo Group, South Australia, C. Dakota Conn, Paul G. Spry, Dan Layton-Matthews, Alexandre Voinot, Alan Koenig 2019 Iowa State University

The Effects Of Amphibolite Facies Metamorphism On The Trace Element Composition Of Pyrite And Pyrrhotite In The Cambrian Nairne Pyrite Member, Kanmantoo Group, South Australia, C. Dakota Conn, Paul G. Spry, Dan Layton-Matthews, Alexandre Voinot, Alan Koenig

Geological and Atmospheric Sciences Publications

The trace element composition of pyrite has been used to explore for hydrothermal ore deposits and to understand ore-forming processes. However, the effects of metamorphism on the trace element distribution in pyrite have received relatively limited attention. In this study, laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analyses of pyrite and pyrrhotite, along with minor amounts of sphalerite, chalcopyrite, and galena, are used to evaluate the effects of amphibolite facies metamorphism on the trace element distribution and remobilization of metals in iron sulfides in the clastic sediment-hosted Cambrian Nairne Pyrite Member (NPM), South Australia. The NPM and the Mt. Torrens Pb-Zn-Ag ...


Numerical Simulation Based Targeting Of The Magushan Skarn Cu-Mo Deposit, Middle-Lower Yangtze Metallogenic Belt, China, Xunyu Hu, Xiaohui Li, Feng Yuan, Alison Ord, Simon M. Jowitt, Yue Li, Wenqiang Dai, Rui Ye, Taofa Zhou 2019 Hefei University of Technology

Numerical Simulation Based Targeting Of The Magushan Skarn Cu-Mo Deposit, Middle-Lower Yangtze Metallogenic Belt, China, Xunyu Hu, Xiaohui Li, Feng Yuan, Alison Ord, Simon M. Jowitt, Yue Li, Wenqiang Dai, Rui Ye, Taofa Zhou

Geoscience Faculty Publications

The Magushan Cu–Mo deposit is a skarn deposit within the Nanling–Xuancheng mining district of the Middle-Lower Yangtze River Metallogenic Belt (MLYRMB), China. This study presents the results of a new numerical simulation that models the ore-forming processes that generated the Magushan deposit and enables the identification of unexplored areas that have significant exploration potential under areas covered by thick sedimentary sequences that cannot be easily explored using traditional methods. This study outlines the practical value of numerical simulation in determining the processes that operate during mineral deposit formation and how this knowledge can be used to enhance exploration ...


Millard Et Al. Pressure Dependence Of Magnesite Creep 2019 Geosciences.Pdf, Caleb Holyoke 2019 University of Akron

Millard Et Al. Pressure Dependence Of Magnesite Creep 2019 Geosciences.Pdf, Caleb Holyoke

Caleb Holyoke

No abstract provided.


Ferromagnesian Silicates And Oxides As Vectors To Metamorphosed Sediment-Hosted Pb-Zn-Ag-(Cu-Au) Deposits In The Cambrian Kanmantoo Group, South Australia, Katherine A. Tott, Paul G. Spry, Meaghan V. Pollock, Alan Koenig, Ross A. Both, Joseph Ogierman 2019 Iowa State University

Ferromagnesian Silicates And Oxides As Vectors To Metamorphosed Sediment-Hosted Pb-Zn-Ag-(Cu-Au) Deposits In The Cambrian Kanmantoo Group, South Australia, Katherine A. Tott, Paul G. Spry, Meaghan V. Pollock, Alan Koenig, Ross A. Both, Joseph Ogierman

Geological and Atmospheric Sciences Publications

The synsedimentary Wheal Ellen, Angas, Scotts Creek, Aclare, Strathalbyn, and St. Ives Pb-Zn-Ag-(Cu-Au) deposits occur in metamorphosed (amphibolite facies) siliciclastic sedimentary rocks of the Tapanappa Formation in the Kanmantoo Group, South Australia. These deposits are hosted in a stratabound, regionally metamorphosed hydrothermal alteration zone composed of garnet-andalusite-biotite ± staurolite schist. This alteration zone and meta-exhalative rocks, consisting mainly of iron formation, and spessartine garnet-quartz, quartz-magnetite, and quartz-gahnite rocks, serve as the major pathfinders to Pb-Zn-Ag-(Cu-Au) deposits, which include sphalerite, pyrite, galena, chalcopyrite, and pyrrhotite, with minor arsenopyrite and sulfosalts. Compositional variations in ferromagnesian silicates and oxides can also be ...


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