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hydrothermal alteration of amphibolites

hydrothermal alteration of amphibolites Amphibolitization within the lower crust in the. Oct 14, 2010 The hydrothermal alteration recorded in the gabbroic rocks possibly occurred under highT conditions; the rocks were then metamorphosed to the amphibolites during retrogressive conditions. These microstructural features of gabbroic rocks and amphibolites in the termination area could have ...

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Hydrothermal Alteration Of Amphibolites

Hydrothermal Alteration Of Amphibolites. 3 the rift zones may be the sites of diverse rocks, particularly basaltic lavas, which can release their metals on hydrothermal alteration.However, because the rift faults can extend very deep well into the upper mantle in some cases, there may also be a component of deep fluids and metals in the hydrothermal system.

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Hydrothermal Alteration Of Amphibolites

Hydrothermal Alteration Of Amphibolites. 2020-4-1Abstract Interaction of hydrothermal circulation in fractured rocks is a common feature in crystalline sequence. In the study area the granitic rock adjacent to fractures in Dasarigudem village northern Nalgonda, has been studied with emphasis on this mineral reactions and associated element mobility occurred during the alteration. Hydrothermal ...

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hydrothermal alteration of amphibolites - JARBUD

Unsystematic chemical (and mineralogical) small-scale variation within the amphibolites is attributed to chemical redistribution associated with low-temperature hydrothermal alteration of the volcanics prior to high-grade regional metamorphism at 650-700°C and 2-4 kb.

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A multi-isotope study (Fe, Ge, O) of hydrothermal ...

2020-12-15  O, Fe, and Ge isotope fractionation during high-temperature hydrothermal alteration in amphibolites. Amphibolites have δ 18 O values (+6.2 to +6.6‰) that are slighlty higher than MORB, in agreement with the δ 18 O values measured in high-T hydrothermally altered basic rocks (Cartwright and Barnicoat 1999) .

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11. Hydrothermal Alteration - USGS

Hydrothermal alteration can be isochemical, like meta-morphism, and dominated by mineralogical changes, or it can be metasomatic and result in significant addition or removal of elements. Where alteration is intense, it can result in signifi-cant volume changes such that mass balance approaches using immobile elements are required to fully understand the altera- tion process (Gresens, 1967 ...

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Hydrothermal alkali metasomatism in the Salobo iron oxide ...

ABSTRACT: Hydrothermal alteration effects on host amphibolites of the Archean iron oxide Cu (-Au) deposit of Salobo, northern Brazil, have been investigated. Preliminary results indicate that the studied rocks were affected by different degrees of alkali metasomatism, resulting in major compositional changes. In addition, similarities in the hydrothermal alteration assemblages and in the ore ...

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Geochemistry of premetamorphic hydrothermal alteration of ...

1993-02-01  In the stratigraphic footwall of the sulfide lenses, zones of premetamorphic hydrothermal alteration can be identified which are discordant to the lithostratigraphy.Hydrothermal alteration of the original sediments is related to submarine exhalative ore-forming processes. This alteration led to a general enrichment of Mg, Fe, Mn, Cu, Zn, Ba, and P and depletion of Ca, Na, K, Rb, Sr, and Ce as ...

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(PDF) A multi-isotope study (Fe, Ge, O) of hydrothermal ...

The negative correlation between δ18O and δ74Ge and between δ18O and δ56Fe, suggests that Ge and Fe isotopes have fractionated during hydrothermal alteration. The δ74Ge shows a slight ...

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Multistage hydrothermal alteration of gabbroic rocks from ...

1986-08-01  Introduction Seafloor hydrothermal alteration is of fundamental importance to the enhanced cooling and metamorphism of ocean crustal rocks and to the hot-spring contribution to ocean water. However, the hydrothermal effluents and secondary mineral assemblages that characterize seafloor hydrothermal systems are known to vary greatly in detail [1-4]. Hydrothermally altered

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(PDF) Greenschist facies hydrothermal alteration of ...

Mass balance of hydrothermal alteration of troctolitic gabbro from Hole 922A shows that the dominant metasomatic change was the addition of water, approximately 5110 mol/m3. The enrichment ...

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Geology, hydrothermal alteration, paragenetic sequence and ...

2020-02-07  Silicic, sericitic, propylitic and albitic hydrothermal alteration assemblages occur at La Maruja level. Fluid inclusion homogenization temperatures, assumed to represent minimum ore fluid temperatures, range between 250°C and 350°C with mean values of about 310°C for Sin Nombre vein and 330°C for other veins; no evidence for boiling is present. The ore fluid salinity ranges from 3.7 to

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Hydrothermal alteration of andesitic lava domes can lead ...

2019-11-07  The permeability of a dome exerts a control on the outgassing efficiency of the underlying magma. The authors investigate the role of hydrothermal alteration on

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Experimental hydrothermal alteration of partially metamict ...

Abstract. We present the results of a series of hydrothermal experiments on grains from two partially metamict zircon samples from Sri Lanka in the temperature range 350 to 650 °C and with ...

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hydrothermal alteration of amphibolites

Hydrothermal alteration effects on host amphibolites have been also investigated. The studied amphibolites occur as lenses or layers close to the contact with the gneissic basement or Included in metagraywackes of the Salobo-Pojuca Group. Trace element chemistry of these rocks indicates that they are subalkaline basalts with tholeiitlc affinity.

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A multi-isotope study (Fe, Ge, O) of hydrothermal ...

Amphibolites display Fe3+/ΣFe ratios (0.11–0.14) ... Hydrothermal alteration produces Fe2+-bearing phases (e.g. Fe-sulphides) that are generally isotopically lighter than Fe 3+-bearingsec-ondary products (e.g. Fe-rich clays or Fe-hydroxides), which show higher δ56Fe values than fresh MORB (Bennett et al., 2009; Polyakov and Mineev, 2000; Rouxel et al., 2003). The variety of alteration prod ...

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Hydrothermal alteration at the Mineral Hill Mine, Jardine ...

Close mobile search navigation. Article navigation. Volume 92, Number 3

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Chemie der Erde

that they might be affected by hydrothermal alteration. They are characterized by moderate Al 2O 3, Fe 2O 3, CaO, V, Zn, and Co contents with negative Eu- and Ce-anomalies. The sulfur concentrations are variable (380–1710ppm). According to the sulfur contents, amphibolites can be grouped into two: amphibolites

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Geochemistry and petrology of gold-bearing hydrothermal ...

hydrothermal alteration zones on Qilanngaarsuit, southern West Greenland Martin Koppelberg, Annika Dziggel, Denis Martin Schlatter, Jochen Kolb and Franz Michael Meyer During field work in 2008, the Geological Survey of Den- mark and Greenland investigated the gold potential of hy-drothermal vein systems in the Nuuk region of the Archaean North Atlantic craton. A new gold occurrence was discov ...

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Hornblende alteration and fluid inclusions in Kärdla ...

2010-01-26  The fractured and crushed amphibolites in the crater area are strongly altered and replaced with secondary chloritic minerals. The most intensive chloritization is found in permeable breccias and heavily shattered basement around and above the central uplift. Alteration is believed to have resulted from convective flow of hydrothermal fluids through the central areas of the crater.

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Hydrothermal Alteration Research Papers - Academia.edu

Hydrothermal Alteration. 832 Followers. Recent papers in Hydrothermal Alteration. Papers; People; Use of X-ray absorption imaging to examine heterogeneous diffusion in fractured crystalline rocks. Heterogeneous diffusion in different regions of a fractured granodiorite from Japan has been observed and measured through the use of X-ray absorption imaging. These regions include gouge-filled ...

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Hydrothermal alteration: 230 Research Articles

Comparison of hydrothermal alteration patterns associated with porphyry Cu deposits hosted by granitoids and intermediate-mafic volcanic rocks, Kerman Magmatic Arc, Iran: Application of geological, mineralogical and remote sensing data. Fulltext Access 12 Pages 2018. Regional geological setting of Guanajuato silver-gold deposits and quantitative petrophysical assessment of their hydrothermal ...

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Hydrothermal alteration zones - SlideShare

2017-01-06  Summary and Conclusions The major types of alteration found in the Siah- Jangal area are clay minerals and Quartz vein. The mineral assemblages are iron-bearing minerals and hydroxyl bearing minerals. Image processing techniques are applied to the digital subset ETM+ such as false color composite, band ratio and principal component analysis (PCA). The hydrothermal alterations in the

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Chemical imprint of highly metamorphosed volcanic-hosted ...

Bonnet, Anne-Laure; Corriveau, Louise; Richer-Laflèche, Marc (2005). Chemical imprint of highly metamorphosed volcanic-hosted hydrothermal alterations in the La Romaine Supracrus

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