hydrothermal alteration of amphibolites

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Amphibolite Classification, Composition, Formation and Uses

Amphibolite; Amphibolite is a coarse-grained metamorphic rock, predominantly composed of mineral amphibole and plagioclase feldspar. It can also contain minor amounts of other metamorphic minerals such as biotite, epidote, garnet, wollastonite, andalusite, staurolite, kyanite, and sillimanite.Amphibolite is found around metamorphic and igneous rock intrusions that solidify between other rocks

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Clinochlore (Mg 2+ 5 3 10 8 Handbook of Mineralogy

Clinochlore (Mg;Fe2+)5Al Occurrence A hydrothermal alteration product of amphiboles, pyroxenes, biotite. In chlorite schists, serpentinites, marbles, calc-silicate rocks, amphibolites, less commonly in ultrama¯c rocks. In ore veins; a detrital component of sediments.

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Mapping of Hydrothermal Alteration in Mount

Hydrothermal alteration is a complex process involving chemical replacement of original minerals in the rock by new minerals where a hydrothermal fluid delivers the chemical reactants and remove the aqueous reaction products (Reed, 1997). An understanding of hydrothermal alteration is of great value because it provides insight

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Combining exploration and multivariate techniques to

stratigraphic relations and hydrothermal alteration of the newly discovered gold mineralisation. Based on our study, we encourage the use of artificial neural network analysis and data interpretation prior to field work in Greenland in areas where only relatively little geological and mineral explora-

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Zonation of Hydrothermal Alteration in the Central Uplift

Abstract The giant (D = 80 km) Puchezh-Katunki astrobleme [1,2] is the site of widespread hydrothermal alteration. It occurs mainly in the central uplift composed of brecciated archean rocks and overlain by allogenic breccia, suevites, and coptomict gravelites (the latter is the lowest bed of crater-lake deposits).

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Characteristics of ophiolite-related metamorphic rocks in

ophiolitic me´lange contains amphibolites from ophiolite-related metamorphic rocks, but the matrix of the Beysehir ophiolitic me´lange is not Hydrothermal alteration 1. Introduction The Beysehir-Hoyran-Hadim Nappes located in the Central Tauride Belt of Turkey (Fig. 1), crop out over a distance of 700 km from NW to SE. They consist of

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The mineralogical characteristics of the hydrothermal

metasomatism (phyllic alteration, argillic alteration), characterized by a large vertical variation. The hydrogen-ion metasomatism is associated with the bor metasomatism, generated by acid solutions and at a high temperature. The vertical and lateral zoning character of the hydrothermal alterations is related to differences in rock composition

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(Kingdom of Saudi Arabia) KEFI Minerals

amphibolites of the Hajizah Gneiss Belt in the east. Along the NTFZ, a belt containing over 40 gold deposit occurs (Worl, 1979). Among them, Jibal Qutman ductile shear zones marked by different stages of hydrothermal alteration and metasomatism. The Jibal Qutman deposit first notes on a new gold discovery in the Arabian Shield

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Amphibolite Infogalactic the planetary knowledge core

Amphibolites need not be derived from metamorphosed mafic rocks. Actinolite schists are often the result of hydrothermal alteration or metasomatism, and thus may not, necessarily, be a good indicator of metamorphic conditions when taken in isolation.

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Influence of bedrock weathering on the shallow ground

Amphibolites of the Ilesha Schist Belt MN. Tijani 1764et al., International Journal of Environmental Sciences Volume 3 No.5, 2013 belt of Ilesha area has undergone alteration as a result of hydrothermal and metamorphic processes. Emofurieta et.al. (1995) from their study of the secondary geochemical and

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iMETAL DRILLS SIGNIFICANT WIDE INTERSECTIONS OF

Nov 05, 2019 · The hole first intersected hydrothermal alteration from 160 m to 235 m, with ~75 meters of a metasedimentary sequence showing extensive silicification, and bleached pale to medium grey mudstone with trace to 3% fine grained disseminated pyrite sulphide mineralization.

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Hydrothermal Alteration Mapping Using ASTER Image

of hydrothermal alteration in order to elaborate the image processing to be adequate to Arta which our study area. The perspective of this study is to be able to apply mapping technics and geothermal development. The ASTER L3A which covers the whole study area has been used. The image was correct by using the FLAASH algorithm.

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GEOPHYSICAL RESPONSE OF HYDROTHERMAL ROCKS

with the amphibolites, where the late hydrothermal event produced an intense alteration with the development of muscovite, epidote, quartz, albite, sericite and carbonate (Palermo et. al. 2000). The Gold Mineralization The Zacarias Au-Ag-Ba deposit is characterized by a discrete anomaly controlled by a NE trend with low amount of Th and

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Hydrothermal Alteration Maps of the Central and Southern

Jan 16, 2020 · A series of hydrothermal alteration maps, which identify the potential locations of hydrothermal silica-rich, propylitic, argillic, and phyllic rocks on Landsat Thematic Mapper (TM) band 7 orthorectified images, and shape files of hydrothermal alteration units are provided.

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GDR Tularosa Basin Play Fairway Analysis Hydrothermal

Tularosa Basin Play Fairway Analysis Hydrothermal Alteration Map. Abstract. This is a hydrothermal alteration map of the Tularosa Basin area, New Mexico and Texas that was created using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) multispectral data band ratios based upon diagnostic features of clay, calcite, silica

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Argillic-Advanced Argillic Alteration Open Energy

Argillic and Advanced Argillic alteration are shallow types of alteration encountrered in a variety of different types of hydrothermal systems. Argillic alteration forms at lower temperatures and primarily consists of kaolinite + montmorillonite clay minerals.

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21. GREENSCHIST FACIES HYDROTHERMAL ALTERATION OF

Highest degrees of water-rock interaction are associated with greenschist facies hydrothermal alteration that produced actinolite + chlorite ± talc ± epidote ± prehnite ± pyrite ± quartz ± titanite. Alteration is strongest near microfractures and veins that we interpret to be the main fluid conduits.

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Hydrothermal Alteration Separating Fact from

Proceedings World Geothermal Congress 2015 Melbourne, Australia, 19-25 April 2015 1 Hydrothermal Alteration Separating Fact from Hyperbole Sarah D. Milicich1, Isabelle Chambefort2 and Greg Bignall2 1GNS Science, Lower Hutt 5040, New Zealand 2GNS Science, Wairakei Research Centre, Taupo 3384, New Zealand [email protected]

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Geologic Framework USGS

hydrothermal alteration events, which affected the Animas River watershed study area and followed caldera formation by 1 million to several million years. The five alteration types, listed in increasing order of intensity, are regional propylitic alteration, weak sericite-pyrite alteration, vein-related quartz-

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Application of Spectral Analysis in Mapping

hydrothermal alteration and iron oxide/hydroxide minerals. The individual principal components (PC) images generated by DPCA reveal the distribution of individual alteration minerals such as sericite, illite, kaolinite, chlorite, and epidote. The best results, in terms of mapping the distribution of alteration, were

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Mineralogy and geothermo-barometry of metapelitic schists

The Gol-Gohar metamorphic complex, a part of east Sanandaj-Sirjan zone, is located 55 km southwest of Sirjan. This complex consists of metapelitic, metapsammitic and metacarbonatic rocks. Field and geochemical evidence indicate that these sedimentary protolith sequences were composed of shale and sandstone alternation with carbonate layers in the upper parts. In

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Experimental hydrothermal alteration of a martian analog

Abstract— A number of martian meteorite samples contain secondary alteration minerals such as Ca‐Mg‐Fe carbonates, Fe oxides, and clay minerals. These mineral assemblages hint at hydrothermal processes occurring in the martian crust, but the alteration conditions are poorly constrained.

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Geomorphic and lithologic characteristics of Wadi Feiran

led to deformation and hydrothermal alterations of the rock units. There is no previous evidence that revealed whether these trends were associated with alteration zones or not. To emphasize that, three sensors such as Landsat-7 ETM+, SRTM, and Radarsat-1 will be used to present evidence of mode of formation of the studied basin and answer

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K isotopes as a tracer of seafloor hydrothermal alteration

Elemental exchange between seawater and oceanic crust is important both in modulating the ionic composition of seawater over geologic time and in controlling the elemental and isotopic makeup of various solid-earth reservoirs. This study documents large and systematic variations in the K-isotope composition of oceanic crust that has been affected by seafloor hydrothermal alteration. These

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An Integrated Geoscientific Approach to Define Zones of

Lenticular bodies of amphibolites and hornblende gneisses are present Gossan rich zones and hydrothermal alteration zones viz. chloritic, sericitic and phyllic alterations (Figure 2) were identified using the remote sensing tech-niques. These alteration zones are the key source of gold mineralization and also the path finder for further de-

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Mineralogy, geochemistry and origin of hydrothermal

tensive hydrothermal alteration and sulphide mineralization are associated with the amphibolites and, in the vicinity of Copperstain Creek, of calc-silicate skarns. Lenses of Arthur Marble occur along the Golden Bay Fault which cuts Onekaka Schist near Copperstain Creek.

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HORNBLENDE ALTERATION IN IMPACT-INFLUENCED

HORNBLENDE ALTERATION IN IMPACT-INFLUENCED BASEMENT ROCKS AT THE KÄRDLA IMPACT alteration in amphibolites at the Kärdla crater. It is likely, that stable tectonic and thermal history of the metamorphism and hydrothermal alteration

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Hydrothermal Alteration Maps of the Central and Southern

Hydrothermal Alteration Maps of the Central and Southern Basin and Range Province of the United States Compiled From Advanced Spaceborne Thermal

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Mineral Alteration and Chlorite Geothermometry in

Aug 14, 2015 · Mineral Alteration and Chlorite Geothermometry in Platinum Group Element (PGE)- Bearing Meta-ultramafic Rocks from South East Cameroon. Ako T. A. 1, 2,, A. Vishiti 1, 3, K. I. Ateh 1, A. C. Kedia 1 and C. E. Suh 1. 1 Economic Geology Unit, Department of Geology, University of Buea, Buea South West Region, Cameroon

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Pre-andean serpentinite-chromite orebodies in the

element compositions of the amphibolites point to a tholeiitic basalt (to picrobasalt) protolith, compatible with an ocean ridge or ocean island environment. Small scale mining worked podiform chromitite lenses and chromite disseminations, strongly deformed, metamorphosed and overprinted by hydrothermal alteration related to deformation.

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