Marek Locmelis

Bureau of Economic Analysis

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Marco L. Fiorentini

University of Western Australia

I. S. Puchtel

University of Maryland, College Park

Stephen J. Barnes

Australian Resources Research Centre

Ricardo Arévalo

University of Maryland, College Park

Bolorchimeg N. Tunnell

Mongolian University of Science and Technology

Norman J. Pearson

Macquarie University

Bolorchimeg Nanzad

Missouri University of Science and Technology

Ryan Mathur

Juniata College

Jonathan Obrist‐Farner

Missouri University of Science and Technology

Enkhjargal Boldbaatar

Mongolian University of Science and Technology

Cooperative Institutions

ARC Centre of Excellence for Core to Crust Fluid Systems

Macquarie University

Australian Research Council

Mineral Resources

Missouri University of Science and Technology

University of Maryland, College Park

Commonwealth Scientific and Industrial Research Organisation

Universidad Nacional Autónoma de México

Montanuniversität Leoben

University of Western Australia

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EXPLORATION FOR ALTERATION HALOS AROUND THE AG-W DEPOSITS IN SOUTHEASTERN MISSOURI

Abstracts with programs - Geological Society of America (2018)

Daniel Joseph Warbritton Marek Locmelis

10.1130/abs/2018am-323811

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HYDROUS MANTLE METASOMATISM AND THE FORMATION OF DEEP LITHOSPHERIC MAGMATIC SULFIDE DEPOSITS

Abstracts with programs - Geological Society of America (2019)

Marek Locmelis Bolorchimeg Nanzad Ryan Mathur

Metasomatism

10.1130/abs/2019am-335520

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The capacity of hydrous fluids to transport and fractionate incompatible elements and metals within the Earth's mantle

Geochemistry Geophysics Geosystems (2014)

John A. Adam Marek Locmelis Juan Carlos Afonso Tracy Rushmer Marco L. Fiorentini

Abstract Both silicate melts and aqueous fluids are thought to play critical roles in the chemical differentiation of the Earth's crust and mantle. Yet their relative effects are poorly constrained. We have addressed this issue by measuring partition coefficients for 50 trace and minor elements in experimentally produced aqueous fluids, coexisting basanite melts, and peridotite minerals. The experiments were conducted at 1.0–4.0 GPa and 950–1200°C in single capsules containing (either 40 or 50 wt %) H 2 O and trace element‐enriched basanite glass. This allowed run products to be easily identified and analyzed by a combination of electron microprobe and LAM‐ICP‐MS. Fluid and melt compositions were reconstructed from mass balances and published solubility data for H 2 O in silicate melts. Relative to the basanite melt, the solutes from H 2 O‐fluids are enriched in SiO 2 , alkalis, Ba, and Pb, but depleted in FeO, MgO, CaO, and REE. With increasing pressure, the mutual solubility of fluids and melts increases rapidly with complete miscibility between H 2 O and basanitic melts occurring between 3.0 and 4.0 GPa at 1100°C. Although LREE are favored over HREE in the fluid phase, they are less soluble than the HFSE (Nb, Ta, Zr, Hf, and Ti). Thus, the relative depletions of HFSE that are characteristic of arc magmas must be due to a residual phase that concentrates HFSE (e.g., rutile). Otherwise, H 2 O‐fluids have the capacity to impart many of the geochemical characteristics that distinguish some rocks and melts from the deep mantle lithosphere (e.g., MARID and lamproites).

Peridotite

Metasomatism

Trace element

10.1002/2013gc005199

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A MELT INTERACTION MODEL FOR THE FORMATION OF THE KRATZ SPRING IRON OXIDE RARE EARTH ELEMENT DEPOSIT, MISSOURI, USA

Abstracts with programs - Geological Society of America (2019)

Brandon James Sullivan Marek Locmelis Bolorchimeg Nanzad Ryan Mathur

Rare-earth element

10.1130/abs/2019am-337298

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Global chemical and isotope heterogeneity in the early Earth's mantle revealed by Pilbara komatiites and basalts

Goldschmidt Abstracts (2021)

I. S. Puchtel M. F. Horan Euan Nisbet Marek Locmelis R. J. Walker

10.7185/gold2021.4530

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Improved Precision and Accuracy of Quantification of Rare Earth Element Abundances via Medium-Resolution LA-ICP-MS

Journal of the American Society for Mass Spectrometry (2017)

Rebecca Funderburg Ricardo Arévalo Marek Locmelis Tomoko Adachi

Laser ablation ICP-MS enables streamlined, high-sensitivity measurements of rare earth element (REE) abundances in geological materials. However, many REE isotope mass stations are plagued by isobaric interferences, particularly from diatomic oxides and argides. In this study, we compare REE abundances quantitated from mass spectra collected with low-resolution (m/Δm = 300 at 5% peak height) and medium-resolution (m/Δm = 2500) mass discrimination. A wide array of geological samples was analyzed, including USGS and NIST glasses ranging from mafic to felsic in composition, with NIST 610 employed as the bracketing calibrating reference material. The medium-resolution REE analyses are shown to be significantly more accurate and precise (at the 95% confidence level) than low-resolution analyses, particularly in samples characterized by low (<μg/g levels) REE abundances. A list of preferred mass stations that are least susceptible to isobaric interferences is reported. These findings impact the reliability of REE abundances derived from LA-ICP-MS methods, particularly those relying on mass analyzers that do not offer tuneable mass-resolution and/or collision cell technologies that can reduce oxide and/or argide formation. Graphical Abstract ᅟ.

Accuracy and precision

Rare-earth element

10.1007/s13361-017-1745-5

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ERRATUM: New estimates of the magnitude of the sea-level jump during the 8.2 ka event

Geology (2023)

Jonathan Obrist‐Farner Mark Brenner Jeffery R. Stone Marta Wojewódka-Przybył Thorsten Bauersachs

Correction| May 10, 2023 ERRATUM: New estimates of the magnitude of the sea-level jump during the 8.2 ka event Jonathan Obrist-Farner; Jonathan Obrist-Farner Search for other works by this author on: GSW Google Scholar Mark Brenner; Mark Brenner Search for other works by this author on: GSW Google Scholar Jeffery R. Stone; Jeffery R. Stone Search for other works by this author on: GSW Google Scholar Marta Wojewódka-Przybył; Marta Wojewódka-Przybył Search for other works by this author on: GSW Google Scholar Thorsten Bauersachs; Thorsten Bauersachs Search for other works by this author on: GSW Google Scholar Andreas Eckert; Andreas Eckert Search for other works by this author on: GSW Google Scholar Marek Locmelis; Marek Locmelis Search for other works by this author on: GSW Google Scholar Jason H. Curtis; Jason H. Curtis Search for other works by this author on: GSW Google Scholar Susan R.H. Zimmerman; Susan R.H. Zimmerman Search for other works by this author on: GSW Google Scholar Alex Correa-Metrio; Alex Correa-Metrio Search for other works by this author on: GSW Google Scholar Lorenz Schwark; Lorenz Schwark Search for other works by this author on: GSW Google Scholar Edward Duarte; Edward Duarte Search for other works by this author on: GSW Google Scholar Antje Schwalb; Antje Schwalb Search for other works by this author on: GSW Google Scholar Etienne Niewerth; Etienne Niewerth Search for other works by this author on: GSW Google Scholar Paula Gabriela Echeverría-Galindo; Paula Gabriela Echeverría-Galindo Search for other works by this author on: GSW Google Scholar Liseth Pérez Liseth Pérez Search for other works by this author on: GSW Google Scholar Author and Article Information Jonathan Obrist-Farner Mark Brenner Jeffery R. Stone Marta Wojewódka-Przybył Thorsten Bauersachs Andreas Eckert Marek Locmelis Jason H. Curtis Susan R.H. Zimmerman Alex Correa-Metrio Lorenz Schwark Edward Duarte Antje Schwalb Etienne Niewerth Paula Gabriela Echeverría-Galindo Liseth Pérez Publisher: Geological Society of America First Online: 10 May 2023 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2023 Geological Society of America Geology (2023) 51 (7): 703. https://doi.org/10.1130/G49296E.1 Article history First Online: 10 May 2023 Connected Content Errata: New estimates of the magnitude of the sea-level jump during the 8.2 ka event Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Jonathan Obrist-Farner, Mark Brenner, Jeffery R. Stone, Marta Wojewódka-Przybył, Thorsten Bauersachs, Andreas Eckert, Marek Locmelis, Jason H. Curtis, Susan R.H. Zimmerman, Alex Correa-Metrio, Lorenz Schwark, Edward Duarte, Antje Schwalb, Etienne Niewerth, Paula Gabriela Echeverría-Galindo, Liseth Pérez; ERRATUM: New estimates of the magnitude of the sea-level jump during the 8.2 ka event. Geology 2023;; 51 (7): 703. doi: https://doi.org/10.1130/G49296E.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search ORIGINAL ARTICLE: 2022, v. 50, no. 1, p. 86–90, https://doi.org/10.1130/G49296.1. First published 30 September 2021. ERRATUM PUBLICATION: 2023, v. 51, no. 7, p. 703–703, https://doi.org/10.1130/G49296E.1. First published 10 May 2023 Figure 2 of the original article contained an error in the location of some of the radiocarbon dates in Cores 1 and 2. This does not change the main findings of the paper. The corrected figure is below. View Original Article You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

10.1130/g49296e.1

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LA-ICP-MS analysis on chromite: a guide for the geodynamic setting of formation of ultramafic massifs in the Bulgarian Rhodopes

Vanessa Colás José María González-Jiménez William L. Griffin Marek Locmelis Fernando Gervilla

Chromite

Ultramafic rock

Massif

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On the formation of magmatic sulphide systems in the lower crust by long‐lived mass transfer through the lithosphere: Insights from the Valmaggia pipe, Ivrea Verbano Zone, Italy

Terra Nova (2020)

Marek Locmelis M. Moroni Steven W. Denyszyn Laura E. Webb Marco L. Fiorentini

Abstract The lower crustal domain of the Ivrea‐Verbano Zone (NW Italy) hosts five ~300‐m‐wide pipe‐like ultramafic intrusions that are metasomatized and exhibit Ni‐Cu‐PGE sulphide mineralization. To better constrain the role of metasomatism in the ore genesis, we studied the best‐preserved pipe at Valmaggia which was emplaced 249 Myrs ago. Phlogopite 40 Ar/ 39 Ar analyses show that the pipe was infiltrated by metasomatic fluids derived from the subcontinental lithospheric mantle (SCLM) in two pulses at ~208 Ma and ~189 Ma which introduced sulphides into the pipe. Consequently, the pipe repeatedly acted as a preferred path for mass transfer from the SCLM into the lower crust over >60 Myrs (i.e., emplacement to second metasomatic pulse). Uplifted block margins, such as the Ivrea‐Verbano Zone, are potentially important exploration targets for magmatic sulphides. We argue that exploration strategies should focus on structures such as pipes that can focus metasomatic agents during ascent through the lithosphere.

Metasomatism

Phlogopite

Peridotite

10.1111/ter.12499

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Citations (7)

PLATINUM-GROUP ELEMENT CONCENTRATIONS IN TROPICAL LAKE SEDIMENTS IN THE EXPLORATION FOR NICKEL LATERITE DEPOSITS

Abstracts with programs - Geological Society of America (2019)

Gabriela Yvonne Ramirez Marek Locmelis Marek Locmelis Jonathan Obrist‐Farner Jonathan Obrist‐Farner

Laterite

Platinum group

10.1130/abs/2019am-336664

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