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Minerals
Special Issues
Mineralogical and Isotope Geochemical Investigations into Metasomatic and Hydrothermal Processes
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Mineralogical and Isotope Geochemical Investigations into Metasomatic and Hydrothermal Processes

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Deposits".

Deadline for manuscript submissions: closed (29 November 2019) | Viewed by 9412

Special Issue Editor

Dr. Kristoffer Szilas

E-Mail Website
Guest Editor
Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen, Denmark
Interests: geology of greenland; archaean tectonics; ultramafic intrusions; mineral deposits
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the present Special Issue, we present the latest understanding of metasomatic and hydrothermal processes. We use these terms in the broadest sense to include any form of mass-transfer in a geological context, be it fluid-rock interaction or melt–rock reactions. Such processes are obviously important to understand in relation to ore deposits and mineralization, because many types of ore-forming processes require some form of element re-mobilization to achieve economic potential.

However, metasomatic and hydrothermal processes are also critical to understand from a fundamental research perspective. Most rock assemblages cannot simply be interpreted at face value, because secondary overprinting occurs in many different geological settings, be it by the pervasive movement of fluids through large sedimentary basins, the reaction of interstitial liquid in igneous cumulates, anataxis, mantle metasomatism, or by diffusive and sub-solidus chemical exchange during metamorphism.

In this Special Issue, we therefore welcome contributions that relate to any form of chemical mass-transfer regardless of the geological setting or rock type.

I very much look forward to reading your manuscript, and I guarantee to find the top experts in the field to review your work.

With best regards,

Dr. Kristoffer Szilas
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Minerals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Geology
  • Mineralogy
  • Petrology
  • Geochemistry
  • Isotopes
  • Metasomatism
  • Hydrothermal alteration
  • Mass-transfer
  • Fluid-rock interaction
  • Mineral deposits
  • Ore-formation

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Published Papers (2 papers)

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Research

21 pages, 8612 KiB  
Article
An Experimental Investigation of Interaction between Andesite and Hyperacidic Volcanic Lake Water
by Vincent van Hinsberg, Kim Berlo and Jacob Lowenstern
Minerals 2020, 10(2), 96; https://doi.org/10.3390/min10020096 - 22 Jan 2020
Cited by 6 | Viewed by 3352
Abstract
Alteration in magmatic-hydrothermal systems leads to distinct changes in rock texture and mineralogy, and a strong redistribution of elements between fluid and rock. Here, we experimentally interacted andesite scoria with hyperacidic, high-sulfidation style fluids from Kawah Ijen volcano (Indonesia) at 25 and 100 [...] Read more.
Alteration in magmatic-hydrothermal systems leads to distinct changes in rock texture and mineralogy, and a strong redistribution of elements between fluid and rock. Here, we experimentally interacted andesite scoria with hyperacidic, high-sulfidation style fluids from Kawah Ijen volcano (Indonesia) at 25 and 100 °C, seeking to reproduce the textures observed in natural samples from this volcano, and to understand the element fluxes that accompany alteration. The susceptibility to alteration in the experiments is Cu–Fe-sulphide > calcic plagioclase > pyroxene > titano-magnetite > sodic plagioclase, with complete preservation of glass. Silicate minerals alter to opaline silica, and gypsum, barite and a Zr-phase precipitate. The selective alteration of the phenocryst minerals results in a preferential release of compatible elements, as the glass is the main incompatible element host. The experiments reproduce the alteration textures of the natural samples, including the preservation of glass, but the predicted compatible over incompatible element enrichment in the alteration element flux is not observed in the natural setting. This suggests that alteration at Kawah Ijen is dominated by lithologies that lack abundant glass, in particular lava flows where the glass has devitrified, despite these lava flows having a lower surface area compared to scoria. Full article
(This article belongs to the Special Issue Mineralogical and Isotope Geochemical Investigations into Metasomatic and Hydrothermal Processes)
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20 pages, 5602 KiB  
Article
Metasomatic Reactions between Archean Dunite and Trondhjemite at the Seqi Olivine Mine in Greenland
by Laura Whyatt, Stefan Peters, Andreas Pack, Christopher L. Kirkland, Tonci Balic-Zunic and Kristoffer Szilas
Minerals 2020, 10(1), 85; https://doi.org/10.3390/min10010085 - 20 Jan 2020
Cited by 9 | Viewed by 5572
Abstract
A metasomatic zone formed between the contact of a 2940 ± 5 Ma intrusive trondhjemite sheet in the Archean dunite of the Seqi Ultramafic Complex, SW Greenland, consists of three distinct mineral zones dominated by (1) talc, (2) anthophyllite, and (3) phlogopite. These [...] Read more.
A metasomatic zone formed between the contact of a 2940 ± 5 Ma intrusive trondhjemite sheet in the Archean dunite of the Seqi Ultramafic Complex, SW Greenland, consists of three distinct mineral zones dominated by (1) talc, (2) anthophyllite, and (3) phlogopite. These zones supposedly resulted from a process of dissolution of olivine by silica rich fluid residual from the trondhjemite magma, with crystallization of secondary minerals along a compositional gradient in the fluid phase. A zircon crystal inclusion in a large (4 cm) olivine porphyroblast was dated in situ via LA-ICP-MS U–Pb isotope analysis, yielding a weighted mean 207Pb/206Pb age of 2963 ± 1 Ma, which coincides with granulite facies metamorphism and potential dehydration. Considering phase relations appropriate for the dunite composition, we deduced the talc forming conditions to be at temperatures of 600–650 °C and at a pressure below 1 GPa. This is supported by oxygen isotope data for talc, anthophyllite and phlogopite in the metasomatic zone, which suggests formation in the temperature range of 600–700 °C from fluids that had a δ18O of ~8‰ and a Δ’17O0.528 of about −40 ppm, i.e., from fluids that could have been derived from the late stage trondhjemite sheet. Full article
(This article belongs to the Special Issue Mineralogical and Isotope Geochemical Investigations into Metasomatic and Hydrothermal Processes)
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