hydrothermal alteration of amphibolites

Petrogenetic link between amphibolites and the banded …

Given that the effects of metamorphic and post-metamorphic processes (i.e. deformation and seafloor/crustal hydrothermal alteration) may have masked the primary geochemical features of rocks in ...

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Emerald mineralization and metasomatism of amphibolite…

The outer alteration zone has gained F, Li, Rb, Cs, and As. Oxygen isotope analyses of igneous and hydrothermal minerals indicate that a single fluid of magmatic origin with δ18OH2O = 8 ...

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Hydrothermal mineral alteration patterns in the Mount Isa …

The aim of this study was to apply hyperspectral imaging to the recognition of hydrothermal alteration patterns related to Cu–Au mineralising systems. ... the Saxby Granite (Suicide Ridge). The MgOH and Fe 2+ mineral maps were also used to distinguish various mafic rocks from amphibolites, which are host rocks for some of the IOCG …

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Mobilization and fractionation of HFSE and REE by high …

(a) The highly fractionated granite intruded the amphibolite and released the high F hydrothermal fluids, which resulted in the hydrothermal alteration of the amphibolite. (b) The hydrothermal fluids were channeled through the interface between amphibolites …

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Geochemistry and origin of Neoarchean amphibolites in

The relative contribution of high-temperature hydrothermal fluid can be evaluated by elemental mixing calculations involving modern Pacific seawater (< 500 m, Alibo and Nozaki, 1999) and high ...

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Fluid flow and metasomatism in a subduction zone …

On Santa Catalina Island, southern California, blueschist to amphibolite facies metasedimentary, metamafic, and meta-ultramafic rocks show veining and alteration …

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Spatial and temporal zoning of hydrothermal alteration and

The Sossego iron oxide–copper–gold deposit (245 Mt @ 1.1% Cu, 0.28 g/t Au) in the Carajás Mineral Province of Brazil consists of two major groups of orebodies (Pista–Sequeirinho–Baiano and Sossego–Curral) with distinct alteration assemblages that are separated from each other by a major high angle fault. The deposit is located along …

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Experimental Study of Dissolution‐Alteration of Amphibole …

The dissociation mechanism and thermodynamic properties of HCl (aq) in hydrothermal fluids (to 700°C, 60 kbar) by ab initio molecular dynamics simulations. The …

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Alteration of amphibolitic wallrocks around the Tanco rare …

Amphibolitic wallrocks around the Tanco rare-element pegmatite record three episodes of metasomatic alteration by pegmatite-derived fluids. The apparent sequence of alteration was (1) B (± Li) metasomatism (tourmalinization), (2) K-Rb-Cs-F (± Li) metasomatism (formation of metasomatic biotite), and (3) propylitic alteration (Hbl + Pl → Ep + Chl + …

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Petrogenetic significance of zoned allanite in garnet amphibolites …

Blocks and matrix alike were affected by a high-T, relatively high-P hydrothermal event, which locally induced partial melting of blocks and apparently was accompanied by considerable trace element metasomatism. In blocks that show evidence for light rare earth element (LREE) enrichment, allanite contains almost all of the LREE …

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Reflectance Spectroscopy of Hydrothermal Alteration …

This work attempts to study the spectral characteristics of the hydrothermal alteration zones developed around the auriferous reefs in the spectral range of 350 nm to 2500 nm.

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Petrology and geochemistry of amphibolites and …

The mineralogy of the amphibolites (hornblende + plagioclase ± quartz ± biotite ± epidote ± apatite ± opaque) and garnet amphibolites in the metamorphic sole rocks of the Muslim Bagh ophiolite is similar except for the presence of garnet in the latter. ... Staudigel H (2003) Hydrothermal alteration processes in the oceanic crust. In ...

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Microstructural and compositional variations of allanite in

The hydrothermal alteration of the veins is evidenced by their abnormal enrichment of certain elements such as REEs, Th, and U in comparison to the host rock. ... Sorensen S S 1991 Petrogenetic significance of zoned allanite in garnet amphibolites from a paleo-subduction zone: Catalina Schist, southern California; ...

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Trace-element composition of hydrothermal zircon and the alteration …

Hydrothermal zircon can be used to date fluid-infiltration events and water/rock interaction. At the Boggy Plain zoned pluton (BPZP), eastern Australia, hydrothermal zircon occurs with hydrothermal scheelite, molybdenite, thorite and rutile in incipiently altered aplite and monzogranite. The hydrothermal zircon is texturally …

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Mobilization and fractionation of HFSE and REE by high …

Hydrothermal titanites from amphibolites yield a lower intercept age of 131 ± 4.3 Ma, which is consistent with the crystallization age of the granitic dike. ... The hydrothermal fluids that are responsible for hydrothermal alteration and mineralization were exsolved from late evolved magmas. Based on micro-textures and trace element ...

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Litho-structural and hydrothermal alteration mapping for …

The mapping of lithology, structures, and hydrothermal alteration zones in Kaiama, northcentral Nigeria, was carried out to locate possible gold mineralization zones. Both aeromagnetic and aeroradiometric datasets were used in the investigation. Enhancement techniques such as first vertical derivative, analytic signal, Euler …

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Potassic alteration of Precambrian amphibolites at Big Falls …

58 geosciences amphibolites diagenesis hydrothermal alteration clays chemical composition geologic formations wisconsin quantitative chemical analysis rock-fluid interactions x-ray fluorescence analysis chemical analysis developed countries metamorphic rocks nondestructive analysis north america rocks usa x-ray emission …

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Quantifying Hydrothermal Alteration: A Review of Methods

Hydrothermal alteration is proximal to many base and precious metal deposits, and its products can provide insights into the characteristics of hydrothermal systems. To be useful to exploration geologists and researchers, however, alteration needs to be typified and quantified. Alteration type informs on mineralising style (e.g., have we …

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Hydrothermal alteration of oceanic basalts by seawater

However, the few reported analyses of amphibolites suggest that. apart from water, the chemical composition does not greatly change during alteration to amphibolites. Hence, in terms of geochemical mass balances, grcenschist faci metabasalts are the most significant.

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Amphibolitization within the lower crust in the termination …

The gabbroic rocks and amphibolites reveal the occurrence of a high hydrothermal activity in the lower crust close to a paleo-ridge. In the gabbroic rocks, …

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Mapping hydrothermal alteration mineral deposits from …

Introduction. Mineral deposits commonly show a spatial association with hydrothermal alteration of the surrounding rocks [8].Also, host rocks of hydrothermal mineral deposits commonly show evidence of chemical interactions with hydrothermal fluids that resulted in the deposition of the minerals [19].The spatial distribution of …

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Petrology and geochemistry of amphibolites and …

On NMORB-normalised plots, the enrichment of LIL elements is interpreted to be the cause of modification of the depleted mantle by a subducted slab component …

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HYDROTHERMAL ALTERATION OF CRATER LAKE …

The basement consists of gneisses, amphibolites, ultra-basic rocks and later granitoid intrusions. The Ries is a complex impact structure with a central basin existing ... impact-generated hydrothermal alteration and sediment deposition occurred concomitantly. References: [1] Cockell C.S. and Lee P. (2002) Bi-ological Reviews, 77: 279-310. [2 ...

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Photomicrographs of unaltered and altered …

Amphibolites adjacent to the quartz reef contain micro-veins of coarse-grained, both recrystallized and unstrained, quartz crystals. There may also be rare hydrothermal calcite-quartz veins.

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Mobilization and fractionation of HFSE and REE by high …

Hydrothermal titanites from amphibolites yield a lower intercept age of 131 ± 4.3 Ma, which is consistent with the crystallization age of the granitic dike.

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Mapping hydrothermal alterations and associated …

This research focuses on the geological investigation of Kaiama region, which is characterized by a diverse range of rock formations, including mylonites, porphyritic granites, gneiss, schist, phyllites, and pink granites. The study employs remote sensing techniques, utilizing Landsat 8 OLI data and Digital Elevation Models, to systematically …

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