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Contact UsGeology, mineralogy, and geochemistry of magnetite-associated au mineralization of the ultramafic-basalt greenstone hosted crusader complex, agnew gold camp, eastern yilgarn craton, western australia; a late archean intrusion-related au deposit?...
The protolith of the amphibole-quartz zone was the host rhyolite Metasomatic replacement of the protolith has partially destroyed obvious textural or chemical evidence of the original rock type Ore faces contain as much as 65 volume percent magnetite, with average grades ranging from 47 to 55 percent magnetic iron...
Metamorphic history of skarns, origin of their protolith and implications for genetic interpretation; an example from three units of the Bohemian Massif Journal of GEOsciences, 2012...
magnetite as a kinematic indicator Rock magnetic experiments show that anisotropy of magnetic susceptibility (AMS) is controlled by magnetite in the mylonites and uhramylonites, and by paramagnetic minerals (hornblende, biotite, ilmenite) in the protolith...
Draft 1 1 Sedimentary Exhalative Origin for Magnetite Deposits of the New Jersey 2 Highlands 3 Peter Matt, Wayne Powell, Richard Volkert, Matthew Gorring and Al Johnson 4 5 ABSTRACT 6 The New Jersey Highlands and contiguous Hudson (New York) Highlands host hundreds of 7 small, worked-out magnetite mines, and the major zinc-oxide deposits of Franklin and Sterling...
Metamorphic rocks composed primarily of amphibole, plagioclase, with subordinate epidote, zoisite, chlorite, quartz, titanite, and accessory leucoxene, ilmenite and magnetite which have a protolith of an igneous rock are known as Orthoamphibolite Para-amphibolite will generally have the same equilibrium mineral assemblage as orthoamphibolite, with more biotite, and may include more quartz ....
Start studying Metamorphic Rocks Identification Exam Learn vocabulary, terms, and more with flashcards, games, and other study tools...
The occurrence of the magnetite ores is very similar to that of economically significant microplaty haematite–martite ore bodies hosted by the same BIF from other parts of the IOG; both are regarded as being of hydrothermal–metasomatic origin, formed at the expense of the iron formation protolith The abundance of magnetite, combined with ....
The Kara magnetite-scheelite deposit is located 40 km south of Burnie in northwestern Tasmania The major orebodies at Kara are hosted by the Ordovician Gordon Limestone at the southern end of the Devonian Housetop Granite, adjacent to the granite or separated from it by the Ordovician Moina Sandstone , Isotopic measurements of the protolith ....
Piniazkiewicz and others, 1994) Ultramafic-hosted talc-magnesite deposits are important sources of talc (Simandl and Ogden, 1999; Harben and Kuzvart, 1997) Luzenac America provided access to company property in the Proctorville, Vermont area and also provided site maps, drill core logs, and continuous core samples drilled in the...
The protolith of the amphibole-quartz zone was the host rhyolite Metasomatic replacement of the protolith has partially destroyed obvious textural or chemical evidence of the original rock type Ore faces contain as much as 65 volume percent magnetite, with average grades ranging from 47 to 55 percent magnetic iron...
Start studying Metamorphic, Igneous and Sedimentary rocks Learn vocabulary, terms, and more with flashcards, games, and other study tools...
64 Metamorphic Environments As with igneous processes, metamorphic rocks form at different zones of pressure (depth) and temperature as shown on the pressure-temperature (P-T) diagram The term facies is an objective description of a rock In metamorphic rocks facies are groups of minerals called mineral assemblag The names of metamorphic facies on the pressure-temperature diagram reflect ....
The protolith of gneiss may be either granite or schist Slate is a metamorphic rock Metamorphic rocks are rocks that change form from one type of rock into another because of time, pressure ....
Metamorphic rocks composed primarily of amphibole, plagioclase, with subordinate epidote, zoisite, chlorite, quartz, titanite, and accessory leucoxene, ilmenite and magnetite which have a protolith of an igneous rock are known as Orthoamphibolite Para-amphibolite will generally have the same equilibrium mineral assemblage as orthoamphibolite, with more biotite, and may include more quartz ....
The mineralogy of skarn is highly related to the protolith Skarn minerals are mainly garnets and pyroxene with a wide variety of calc-silicate and associated minerals Typical skarn minerals include pyroxene, garnet, idocrase, wollastonite, actinolite, magnetite or hematite, epidote and scapolite...
Shunso Ishihara, 2004 "The redox state of granitoids relative to tectonic setting and earth history: The magnetite-ilmenite series 30 years later", The Fifth Hutton Symposium on the Origin of Granites and Related Rocks, S Ishihara, WE Stephens, SL Harley, M Arima, T Nakajima...
PDF | On Aug 12, 2013, Jan Bubal and others published Magnetite chemistry in skarns of the Bohemian Massif: evaluating competing effects of protolith inheritance, crystal chemistry, fluid ....
PDF | On Aug 12, 2013, Jan Bubal and others published Magnetite chemistry in skarns of the Bohemian Massif: evaluating competing effects of protolith inheritance, crystal chemistry, fluid ....
Highest vanadium values typically occur where massive to sub-massive concentrations of magnetite or ilmeno-magnetite are present The magnetite-rich units are recognizable in airborne magnetometer survey results and four target areas along a 15 km north-south positive aeromagnetic trend were drilled by Otanmaki OY in the 1960’s...
Most of the magnetite deposits of the eastern Grenville Province have been described as precipitates from hydrothermal solutions derived from metamorphic processes, from early, late, or post-Grenville granites, or as metasediments Granites host many of these deposits, but others, including the historic Edison iron mines of New Jersey, are hosted by potassium-feldspar gneiss, commonly ....
Ortho-amphibolite vs para-amphibolite Metamorphic rocks composed primarily of amphibole, plagioclase, with subordinate epidote, zoisite, chlorite, quartz, titanite, and accessory leucoxene, ilmenite and magnetite which have a protolith of an igneous rock are known as Orthoamphibolite Para-amphibolite will generally have the same equilibrium mineral assemblage as orthoamphibolite, with ,...
the protolith in this fossil fumarole, mass was conserved during the alteration reactions for most of the system, but mass gains of l4-2Do/o were determined for three samples in the leached ash-flow tuff Relative to unaltered dacite protolith, significant enrichments...
Schist is a strongly foliated medium-grade metamorphic rock It is characterized by an abundance of platy or elongated minerals (micas, chlorite, talc, graphite, amphiboles) in a preferred orientationVarieties of this rock type share similarities in appearance (schistosity) but may be highly variable in composition...
Wanna have some fun? Gather some geologists around a sample that might be phyllite or might be schist and watch them go Phyllite is a protolith of schist...
saprolite layer consisting of remnants of the protolith and lizardite, goethite, magnetite, maghemite, chromite, and hydrous Mg- and Ni-rich silicat At the top of the saprolite is a transition into a clay-rich layer Above the clays is a limonite layer with goethite, maghemite, hematite, gibbsite, and Mn-...
Shunso Ishihara, 2004 "The redox state of granitoids relative to tectonic setting and earth history: The magnetite-ilmenite series 30 years later", The Fifth Hutton Symposium on the Origin of Granites and Related Rocks, S Ishihara, WE Stephens, SL Harley, M Arima, T Nakajima...
We excavated a trench on Anxian-Guanxian fault and found fault gouges (black and red fault gouges) have higher magnetic susceptibility than protolith • Highest magnetic susceptibility values of red gouge is neoformation of magnetite while that of the black gouge have been reduced by formation of goethite •...
The protolith of the amphibolite is a ma˜c rock or a sedimentary derivative of a ma˜c igneous rock, and the calc-silcate rocks (garnet granofels, garnet-biotite schist, actinolite schist, and amphibole-biotite granofels) originated from , ilmenite, magnetite, pyrrhotite, pyrite, and chalcopyrite Amphibolite (Zaa) ....
Albitite formation by selective pervasive sodic alteration ,
Know Moreselvedges where the protolith texture is commonly destroyed The breccias (up to 10 m across) are typically more enriched in magnetite and have up to 25% magnetite in the matrix compared to altered clasts and veined wall rock that consistently have low (<2%) quantities of magnetite These breccias are matrix supported and...