Special Issue "Geochronology Applied to Metallogeny and Deposit Studies"

A special issue of Geosciences (ISSN 2076-3263).

Deadline for manuscript submissions: closed (30 June 2018)

Special Issue Editor

Guest Editor
Dr. Paul Alexandre

Department of Geology, Brandon University, John R. Brodie Science Centre, 270–18th Street, Brandon, Manitoba, R7A 6A9, Canada
Website | E-Mail
Interests: geochemical exploration; metallogeny; geostatistics; mineralogy; geochronology

Special Issue Information

Dear Colleagues,

It has been frequently and extensively demonstrated that geochronology has the potential to very significantly contribute to metallogeny and deposit studies by precisely placing the deposit formation within a fast evolving geodynamic context and thus helping elucidate the physical and chemical conditions prevailing at that time, ultimately leading to a much improved understanding of the ore-deposition events.

This Special Issue of Geosciences aims to gather high-quality original research articles or reviews on the topic of Geochronology Applied to Metallogeny and Deposit Studies.

Submissions are invited on geochronology applied to a wide variety of deposit types, from igneous-related to supergene, in a variety of geodynamic contexts, and applying a range of dating techniques (40Ar/39Ar, U/Pb, 207Pb/206Pb, Re/Os, Sm/Nd). Of particular interest are submissions describing innovative analytical techniques, applications, interpretations, or implications. Success stories of dating particularly challenging deposits, such as the very young or containing very low amounts of datable minerals, are also welcome.

Prof. Paul Alexandre
Guest Editor

Manuscript Submission Information

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Keywords

  • Geochronology
  • Applied Geochronology
  • Metallogeny
  • Deposit Studies
  • Mineral Exploration
  • Economic Geology
  • 40Ar/39Ar
  • U/Pb
  • Re/Os

Published Papers (2 papers)

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Research

Open AccessArticle Age and Origin of the Mesoproterozoic Iron Oxide-Apatite Mineralization, Cheever Mine, Eastern Adirondacks, NY
Geosciences 2018, 8(9), 345; https://doi.org/10.3390/geosciences8090345
Received: 2 July 2018 / Revised: 28 August 2018 / Accepted: 7 September 2018 / Published: 12 September 2018
Cited by 1 | PDF Full-text (5251 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
At the Cheever Mine, located in the eastern Adirondack Mountains of the Mesoproterozoic Grenville Province, iron oxide-apatite ore forms a narrow (<3 m) sheet cross-cutting metasomatically altered, magnetite-bearing, albite-rich leucogranitic host rocks of the Lyon Mountain Granite suite. Zircon from the ore and [...] Read more.
At the Cheever Mine, located in the eastern Adirondack Mountains of the Mesoproterozoic Grenville Province, iron oxide-apatite ore forms a narrow (<3 m) sheet cross-cutting metasomatically altered, magnetite-bearing, albite-rich leucogranitic host rocks of the Lyon Mountain Granite suite. Zircon from the ore and five samples of country rock were dated by Laser Ablation-Multi-Collector-Inductively Coupled Plasma-Mass Spectrometry. The ore yielded a Concordia age of 1033.6 ± 2.9 Ma while three samples of host rock yielded ages of 1036.3 ± 2.9, 1040 ± 11, and 1043.9 ± 4.1 Ma. Two additional samples of host rock yielded older ages of 1059.6 ± 3.4 and 1066.0 ± 6.3 Ma and contain zircon xenocrystic cores with 207Pb/206Pb ages up to 1242 Ma. The zircons analyzed, including those separated from the ore, have characteristics typically associated with an igneous origin including size, shape, inclusions, oscillatory zoning, typical chondrite-normalized REE patterns, U contents, and U/Th ratios. This data establishes the age of the ore and alteration and a temporal, and likely genetic, connection between the ore and members of the Lyon Mountain Granite suite. A model invoking melting of Shawinigan country rocks, magmatic differentiation, and long-lived magmatic and metasomatic input along extensional fault conduits is proposed for the ore’s genesis. At the Cheever Mine, magmatic hydrothermal fluids and/or post-intrusion alteration appears not to have had a major impact on zircon, which preserves original U-Pb systematics. Full article
(This article belongs to the Special Issue Geochronology Applied to Metallogeny and Deposit Studies)
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Open AccessArticle Columbite-Group Minerals from New York Pegmatites: Insights from Isotopic and Geochemical Analyses
Geosciences 2018, 8(5), 169; https://doi.org/10.3390/geosciences8050169
Received: 11 April 2018 / Revised: 27 April 2018 / Accepted: 3 May 2018 / Published: 9 May 2018
PDF Full-text (2538 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Columbite crystals from niobium-yttrium-fluorine (NYF) pegmatites lacking zircon or containing metamict cyrtolite were analyzed for major and minor elements (Electron Microprobe (EMP)), trace elements (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS)), and U-Pb geochronology (Laser AblationMulti-Collector-Inductively Coupled Plasma-Mass Spectrometry (LA-MC-ICP-MS)). All four pegmatite localities [...] Read more.
Columbite crystals from niobium-yttrium-fluorine (NYF) pegmatites lacking zircon or containing metamict cyrtolite were analyzed for major and minor elements (Electron Microprobe (EMP)), trace elements (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS)), and U-Pb geochronology (Laser AblationMulti-Collector-Inductively Coupled Plasma-Mass Spectrometry (LA-MC-ICP-MS)). All four pegmatite localities sampled are hosted by the Proterozoic Fordham gneiss and/or Paleozoic Bedford gneiss (Columbite-(Fe); Kinkel and Baylis localities) and the Manhattan Schist of Lower Paleozoic age (Columbite-(Mn); Fort George and Harlem River Drive localities) and yield Neoacadian ages. The weighted average U-Pb ages are 372.2 ± 8.2 Ma (Baylis Quarry), 371.3 ± 7.3 and 383.4 ± 8.9 Ma (Kinkel Quarry); 383 ± 15 Ma (185th St. and Harlem River Drive); and 372 ± 10 Ma (Fort George). A partial metamict zircon (“cyrtolite”) from the Kinkel Quarry yielded a weighted average U-Pb age of 376.9 ± 4.3 Ma. The Neoacadian ages obtained agree with those determined by thermal ionization mass spectrometry (TIMS) for zircon from Lithium-Cesium-Tantalum (LCT) pegmatites from Connecticut and Maine. No pegmatites temporally associated with the Taconic orogeny were found. The size, lack of common Pb, uniform U concentrations across crystal cross-sections, sufficient but moderate uranium concentrations, lack of metamictization, and consistency in U-Pb isotopic ratios for columbite samples BCB-COL, NYSM #25232, and NYSM #525.8 suggests they show promise as potential standards for oxide mineral LA-MC-ICP-MS geochronological analyses, however, additional characterization using ID-TIMS would be necessary to develop as such. Full article
(This article belongs to the Special Issue Geochronology Applied to Metallogeny and Deposit Studies)
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