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Minerals
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Accessory Mineral Petrogenesis and Isotopic Robustness
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Accessory Mineral Petrogenesis and Isotopic Robustness

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

Deadline for manuscript submissions: closed (20 May 2019) | Viewed by 9160

Special Issue Editor

Prof. Dr. Christopher R.M. McFarlane

E-Mail Website
Guest Editor
Department of Earth Sciences, University of New Brunswick, Fredericton, NB E3B5A3, Canada
Interests: accessory minerals; geochronology; isotope geochemistry; ore deposits; LA-ICP-MS; crustal evolution
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue of Minerals is focused on accessory mineral petrogenesis and isotopic robustness.  Accessory minerals can be used for a wide variety of investigations spanning geochronology, radiogenic and light stable isotope tracers, and linking chemical and isotopic zoning to the origin and evolution magmatic, metamorphic, sedimentary, hydrothermal, and impact-related systems.  The isotopic robustness of accessory minerals in these systems is, therefore, of critical interest. This robustness can be tested both experimentally and empirically. Yet numerous factors, such as intrinsic variations in crystallinity, defect structure, effects of metasomatism and dissolution–reprecipitation, diffusion during UHT metamorphism, and planetary impact processes. can contribute to open system behaviour. The advent of increasingly sensitive mass spectrometers, more sophisticated data reduction software, and novel micro-sampling techniques have also opened the door to the study of a more diverse suite accessory minerals.

The aim of this Special Issue is to gather new applications and review articles that reconstruct the petrogenesis of accessory minerals and test the isotopic robustness of these minerals using experimental and empirical studies.

Prof. Dr. Christopher R.M. McFarlane
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

  • Accessory minerals
  • Isotopic robustness
  • Experimental petrology
  • Crustal evolution
  • Diffusion
  • Metasomatism

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Published Papers (2 papers)

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Research

26 pages, 5614 KiB  
Article
Columbite U-Pb Geochronology of Kalu’an Lithium Pegmatites in Northern Xinjiang, China: Implications for Genesis and Emplacement History of Rare-Element Pegmatites
by Yonggang Feng, Ting Liang, Ze Zhang, Yiqian Wang, Yi Zhou, Xiuqing Yang, Jinggang Gao, Hui Wang and Kun Ding
Minerals 2019, 9(8), 456; https://doi.org/10.3390/min9080456 - 25 Jul 2019
Cited by 22 | Viewed by 4860
Abstract
The Kalu’an-Azubai pegmatite field, one of the most important rare-metal metallogenic regions in China, contains a large number of pegmatite dikes belonging to spodumene and lepidolite subtypes. Columbite-group minerals (CGMs) collected from three spodumene subtype pegmatites (No. 802, No. 803, and No. 805 [...] Read more.
The Kalu’an-Azubai pegmatite field, one of the most important rare-metal metallogenic regions in China, contains a large number of pegmatite dikes belonging to spodumene and lepidolite subtypes. Columbite-group minerals (CGMs) collected from three spodumene subtype pegmatites (No. 802, No. 803, and No. 805 pegmatites) were analyzed for major element contents using EPMA (electron probe micro-analyzer) and dated using LA-ICP-MS (laser ablation-inductively coupled plasma mass spectrometer). The crystallization ages of the CGMs from No. 802, No. 803, and No. 805 pegmatites are 209.5 ± 1.4 Ma (2σ), 198.3 ± 2.0 Ma (2σ), and 224.3 ± 2.9 Ma (2σ), respectively. Oscillatory zoning and/or sector zoning along with the associated mineral assemblages suggest that the dated columbite is of magmatic origin. The crystallization ages of the columbite grains thus represent the emplacement ages of the Li pegmatites. Therefore, our dating results indicate that there were three emplacement events of the Li-rich pegmatite-forming melts in a timeframe of ~30 Ma. In combination with previous studies, we conclude that the Li pegmatites were formed before the Be-Ta-Nb pegmatites (~194–192 Ma), which precludes the genesis of rare-metal pegmatites via fractional crystallization of a granitic magma in the Kalu’an-Azubai region. Full article
(This article belongs to the Special Issue Accessory Mineral Petrogenesis and Isotopic Robustness)
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17 pages, 3094 KiB  
Article
Subduction-Induced Fractionated Highly Siderophile Element Patterns in Forearc Mantle
by Yang Xu and Chuan-Zhou Liu
Minerals 2019, 9(6), 339; https://doi.org/10.3390/min9060339 - 1 Jun 2019
Cited by 15 | Viewed by 3997
Abstract
Compositions of highly siderophile elements (HSEs) in forearc mantle have been little studied and effects of slab dehydration on their abundances in forearc mantle remains unclear. This study reports two different kinds of HSE patterns for peridotites from a New Caledonia forearc ophiolite. [...] Read more.
Compositions of highly siderophile elements (HSEs) in forearc mantle have been little studied and effects of slab dehydration on their abundances in forearc mantle remains unclear. This study reports two different kinds of HSE patterns for peridotites from a New Caledonia forearc ophiolite. The Group-I samples show relatively flat patterns of Ir-group-platinum-group elements (IPGEs) and enrichment of Pt over Pd. Such patterns imply that interstitial sulfides were significantly removed through melt extraction, whereas sulfides enclosed within silicates were mostly unaffected. Meanwhile, Pt-Fe alloys were generated, resulting in suprachondritic Pt/Pd ratios. In contrast, the Group-II samples display convex HSE patterns and are depleted in all HSEs except for Ru, yielding strongly positive Ru anomalies. This indicates that both enclosed and interstitial sulfides were substantially consumed, whereas chromite was generated to stabilize Ru. Compared to abyssal peridotites, subduction-related peridotites commonly have stronger fractionation in the HSEs. Therefore, the HSE data of mantle peridotites are potentially able to discriminate the tectonic settings of ophiolites. Full article
(This article belongs to the Special Issue Accessory Mineral Petrogenesis and Isotopic Robustness)
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