Ryan Mathur

Juniata College

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Vinciane Debaille

Université Libre de Bruxelles

Nina Zaronikola

Colorado School of Mines

Sophie Decrée

Institute of Natural Sciences

Christodoulos Hadjigeorgiou

Geological Survey Department

H. Arthur Bankoff

Brooklyn College

Konstantin Hatzipanagiotou

University of Patras

Bolorchimeg Nanzad

Missouri University of Science and Technology

Degao Zhai

China University of Geosciences (Beijing)

Petros Petrounias

University of Patras

Wayne Powell

The Graduate Center, CUNY

Cooperative Institutions

University of Patras

Geological Survey of Canada

Missouri University of Science and Technology

Université Libre de Bruxelles

Institute of Archaeology

Brooklyn College

City University of New York

Bedford Institute of Oceanography

China University of Geosciences (Beijing)

Juniata College

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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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An isotopic investigation of supergene weathering process in gossans from the Troodos ophiolite, Cyprus.

Goldschmidt Abstracts (2021)

Nina Zaronikola Vinciane Debaille Sophie Decrée Ryan Mathur Christodoulos Hadjigeorgiou

Supergene (geology)

10.7185/gold2021.6862

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An isotopic and trace element investigation of gossans from Troodos ophiolite, Cyprus

Nina Zaronikola Vinciane Debaille Sophie Decrée Ryan Mathur Christodoulos Hadjigeorgiou

The Troodos ophiolite is widely accepted to be a fragment of Mesozoic oceanic crust, which uplifted during Alpine orogeny, due to the collision of Eurasia and Africa (Gass and Masson-Smith, 1963; Vibetti, 1993; Adamides, 2011; Antivachis, 2015). It belongs to supra-subduction ophiolites, which probably set up during subduction initiation associated with back-arc spreading (Pearce, 1975; Rautenschlein et al., 1985; Pearce and Robinson, 2010; Martin et al., 2019). The Troodos ophiolite is mentioned to be one of the most well studied and well-preserved ophiolitic sequences (Moores and Vine, 1971; Benn and Laurent, 1987; Patten et al., 2017), presenting significant Cyprus-type sulphide deposits (Constantinou and Govett, 1973; Adamides, 2014).Cyprus-type deposits are generally, considered as mafic type volcanogenic massive sulfide deposits (VMS), mainly rich in copper and subsidiary zinc, with average grade of 1.3 &#177; 1.1% Cu and 0.8 &#177; 0.4% Zn (Hannington et al., 1998; Barie and Hannington, 1999; Patten et al., 2016). VMS deposits are formed in the sea floor, along mid-ocean ridges, by the circulation of high temperature hydrothermal fluids, which their source is seawater (Gillis and Robinson, 1988; Richards et al., 1989; Patten et al., 2017; Martin et al., 2019). In many different regions along the Troodos ophiolite, the VMS deposits are covered by thick, Fe oxides enriched gossans (Bear, 1960; Herzig et al., 1991). In general, those can be formed, when the VMS deposits are exposed to weathering and oxidizing conditions (Herzig et al., 1991), but still the conditions for their formation are debated. The studied gossans from Troodos ophiolite are variegated due to the presence of white silica, red hematite and yellow jarosite. Gossans are always a very interesting part of the ophiolitic sequence from an economic point of view, as they present not only significant amount of extractible copper and zinc, but also, gold and silver (Bear, 1960; Herzig et al., 1991).We aim to examine the major and trace elements of gossans, which have been collected from different mines (West Apliki, Skouriotissa and Agrokipia mines) of Troodos ophiolite, and define their enrichment or depletion in copper and zinc, by coupling copper and zinc stable non-traditional isotopes. We combined copper with zinc isotopes in a very novel and original approach in order to give information about the conditions prevailing in the system of interest. As many authors mentioned before, supergene enriched environments are the best places to examine the behavior of Cu isotope fractionation under the weathering conditions of ore deposits (Mathur et al., 2008). On the other hand, Zn isotopes are not redox sensitive, but pH-sensitive (Pons, 2016). By coupling them, it can bring light in understanding the way, the nature of fluids that led to gossans formation and their enrichment in copper and zinc in different locations of Troodos ophiolite.

Orogeny

10.5194/egusphere-egu2020-7018

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Challenges of Using Copper Isotope Ratios to Trace the Origin of Native Copper Artifacts: An Example from the Keweenaw Peninsula

Annals of Carnegie Museum (2014)

Ryan Mathur M E Wilson Marina L. Parra

In an effort to understand how and if Cu isotopes can be used to trace native copper artifacts to their mineral deposits of origin, this study presents Cu isotope measurements from weathered native Cu artifacts and ores known to be derived from the Precambrian native copper deposits of Michigan. The five weathered artifacts have Cu isotope compositions ranging from δ65Cu= 0.54 to -1.15%o. Weathered glacial till native copper nuggets range from δ65Cu= -0.12 to 0.54%o, non-weathered ores have δ65Cu= 0.33 ± 0.2%o (n= 42 from the literature and this study), a completely oxidized copper rind derived of large glacial boulder of native copper has -0.04%o. The oxidized rinds along with the weathered artifacts possess isotopically lighter signatures in comparison to the non-weathered ores and interiors of weathered copper nuggets.The copper isotope data indicate the interiors of oxidized nuggets correlate with the non-weathered ores. Copper from the artifacts was sampled as micro drill bits (0.001–0.0009g) and larger cut pieces of the artifacts (>0.5g). Only the larger sample artifacts have the same copper isotope composition as the non-weathered ores, and not the oxidized rinds, and non-weathered interiors of copper nuggets. Therefore, when considering the unreacted interior of the native copper artifacts, the copper isotopic composition matches that of the known copper ore source. In contrast, weathering clearly depletes 65Cu on the surfaces of artifacts and micro-sampling of the outer rims does not yield similar isotope results between sources and artifacts.

10.2992/007.082.0304

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Coupled antimony and sulfur isotopic composition of stibnite as a window to the origin of Sb mineralization in epithermal systems (examples from the Kremnica and Zlatá Baňa deposits, Slovakia)

Mineralium Deposita (2024)

Peter Koděra Ryan Mathur Degao Zhai Rastislav Milovský Pavel Bačo

Stibnite

10.1007/s00126-024-01333-9

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The sulfur isotope evolution of the Duobuza Cu-Au porphyry deposit in the Duolong district, Central Tibet, China

Mineralium Deposita (2025)

Jia Sun Jingwen Mao Georges Beaudoin Ryan Mathur Xianzhe Duan

Mineral resource classification

10.1007/s00126-024-01339-3

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Determining Prehistoric Mining Practices in Southeastern Europe Using Copper Isotopes

EGUGA (2017)

Wayne Powell Ryan Mathur H. Arthur Bankoff Aleksandar Bulatović Vojislav Filipović

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Rodingitization of mafic and ultramafic rocks in ophiolites from Northern Greece, seen by non-traditional stable isotopes, such as Cu, Fe and Zn.

Nina Zaronikola Vinciane Debaille Aikaterini Rogkala Petros Petrounias Ryan Mathur

Rodingites are metasomatic rocks, frequently found in ophiolitic complexes. They offer important information about the interaction between ultramafic-mafic rocks and metasomatizing fluids, as well as about the post-magmatic evolution of ophiolitic suites (Tsikouras et al., 2009; Hu & Santosh, 2017; Surour, 2019; Laborda-Lopez et al., 2020). Metasomatism, such as rodingitization, is a very intricate process, which depends on the mineralogy of the initial rock, the nature of the metasomatic agent, the fluid/rock ratio, the duration of metasomatism and the chemical disequilibrium at the time of metasomatism between the host rock and the metasomatic medium (Poitrasson et al., 2013). Rodingites from the Veria-Naousa and Edessa ophiolites, in Northern Greece, were geochemically analyzed and characterized by substantial overprint of primary textures. Their field observation, their neoblastic mineral assemblages and metasomatic textures reveal that they derived from ultramafic and mafic protoliths. The mineral phases in the ultramafic derived rodingites (UDR) include mainly diopside, garnet, chlorite, epidote, tremolite and Fe-Ti oxides whereas mafic derived rodingites (MDR) consist of diopside, garnet, vesuvianite, chlorite, quartz, prehnite and actinolite. The studied rodingites present &#948;65Cu values varying from -0.17&#8240; to 0.62&#8240; and for ultramafic and mafic parent-rocks from -0.49&#8240; to +0.50&#8240;. The UDR and MDR from both ophiolites display &#948;66Zn range from -0.06&#8240; to 0.74&#8240; and their photoliths present a narrower range from +0.04&#8240; to +0.41&#8240;. Rodingitization affects in different way UDR and MDR samples. On one hand, Cu isotope ratios are systematically heavier in rodingites compared to their respective protoliths, except for one rodingite sample that requires confirmation due to large error bar. On the other hand, Zn isotopes show enrichment in light isotopes (group 1: comprising all UDR and some MDR samples), or in heavy isotopes (group 2, only MDR samples). Intriguingly, the same protolith can lead to both group 1 and 2 rodingites, as defined here. &#160;No mineralogical or geochemical trend can be found to understand the dual behavior of Zn stable isotopes during rodingitization so far. Fe isotopes do not show any significant fractionation of &#948;56Fe, ranging from +0.07&#8240; to +0.19&#8240; for the rodingites and from +0.12&#8240; to +0.23&#8240; for their protoliths, indicating that Fe isotopes are highly resistant to rodingitization. Our study shows that rodingitization enriches metasomatized samples in heavy Cu isotopes and has no impact on Fe isotopes. It remains unclear why Zn isotopes can be affected both ways.

Metasomatism

Ultramafic rock

Protolith

Peridotite

Tremolite

10.5194/egusphere-egu21-2025

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