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Rhenium enrichment in the Muratdere Cu-Mo (Au-Re) Porphyry Deposit, Turkey: Evidence from stable isotope analyses (δ34S, δ18O, δD) and laser ablation-inductively coupled plasma-mass spectrometry analysis of sulfides

Rhenium enrichment in the Muratdere Cu-Mo (Au-Re) Porphyry Deposit, Turkey: Evidence from stable isotope analyses (δ34S, δ18O, δD) and laser ablation-inductively coupled plasma-mass spectrometry analysis of sulfides
Rhenium enrichment in the Muratdere Cu-Mo (Au-Re) Porphyry Deposit, Turkey: Evidence from stable isotope analyses (δ34S, δ18O, δD) and laser ablation-inductively coupled plasma-mass spectrometry analysis of sulfides
The Muratdere Cu-Mo (Au) porphyry deposit in western Turkey contains elevated levels of rhenium and is hosted within granodioritic intrusions into an ophiolitic mélange sequence in the Anatolian belt. The deposit contains several stages of mineralization: early microfracture-hosted molybdenite and chalcopyrite, followed by a quartz-pyrite-chalcopyrite vein set associated with Cu-Au grade, a quartz-chalcopyrite-pyrite-molybdenite vein set associated with Cu-Mo-Re grade, and a later polymetallic quartz-barite-sphalerite-galena-pyrite vein set. The rhenium in Muratdere is hosted within two generations of molybdenite: early microfracture-hosted molybdenite and later vein-hosted molybdenite. In situ laser ablation-inductively coupled plasma-mass spectrometry analysis of sulfides shows that the later molybdenite has significantly higher concentrations of Re (average 1,124 ppm, σ = 730 ppm, n = 43) than the early microfracture-hosted molybdenite (average 566 ppm, σ = 423 ppm, n = 28). Pyrite crystals associated with the Re-rich molybdenite have higher Co and As concentrations than those in other vein sets, with Au associated with As. The microfracture-hosted sulfides have δ34S values between −2.2‰ and +4.6‰, consistent with a magmatic source. The vein-hosted sulfides associated with the high-Re molybdenite have a δ34S signature of 5.6‰ to 8.8‰, similar to values found in peridotite lenses in the Anatolian belt. The later enrichment in Re and δ34S-enriched S may be sourced from the surrounding ophiolitic country rock or may be the result of changing redox conditions during deposit formation.
0361-0128
1443-1466
Mcfall, Katie
d5e5dd93-9fd5-41f4-ac4b-d034170ebe9d
Roberts, Stephen
f095c7ab-a37b-4064-8a41-ae4820832856
Mcdonald, Iain
22362420-baf6-46c4-8623-8db5be2ea46e
Boyce, Adrian J.
e21e60d3-a9ab-4cad-9bd8-f6680f3dbd7f
Naden, Jonathan
00b428b8-f0eb-45b5-a329-2375829f3075
Teagle, Damon
396539c5-acbe-4dfa-bb9b-94af878fe286
Mcfall, Katie
d5e5dd93-9fd5-41f4-ac4b-d034170ebe9d
Roberts, Stephen
f095c7ab-a37b-4064-8a41-ae4820832856
Mcdonald, Iain
22362420-baf6-46c4-8623-8db5be2ea46e
Boyce, Adrian J.
e21e60d3-a9ab-4cad-9bd8-f6680f3dbd7f
Naden, Jonathan
00b428b8-f0eb-45b5-a329-2375829f3075
Teagle, Damon
396539c5-acbe-4dfa-bb9b-94af878fe286

Mcfall, Katie, Roberts, Stephen, Mcdonald, Iain, Boyce, Adrian J., Naden, Jonathan and Teagle, Damon (2019) Rhenium enrichment in the Muratdere Cu-Mo (Au-Re) Porphyry Deposit, Turkey: Evidence from stable isotope analyses (δ34S, δ18O, δD) and laser ablation-inductively coupled plasma-mass spectrometry analysis of sulfides. Economic Geology, 114 (7), 1443-1466. (doi:10.5382/econgeo.4638).

Record type: Article

Abstract

The Muratdere Cu-Mo (Au) porphyry deposit in western Turkey contains elevated levels of rhenium and is hosted within granodioritic intrusions into an ophiolitic mélange sequence in the Anatolian belt. The deposit contains several stages of mineralization: early microfracture-hosted molybdenite and chalcopyrite, followed by a quartz-pyrite-chalcopyrite vein set associated with Cu-Au grade, a quartz-chalcopyrite-pyrite-molybdenite vein set associated with Cu-Mo-Re grade, and a later polymetallic quartz-barite-sphalerite-galena-pyrite vein set. The rhenium in Muratdere is hosted within two generations of molybdenite: early microfracture-hosted molybdenite and later vein-hosted molybdenite. In situ laser ablation-inductively coupled plasma-mass spectrometry analysis of sulfides shows that the later molybdenite has significantly higher concentrations of Re (average 1,124 ppm, σ = 730 ppm, n = 43) than the early microfracture-hosted molybdenite (average 566 ppm, σ = 423 ppm, n = 28). Pyrite crystals associated with the Re-rich molybdenite have higher Co and As concentrations than those in other vein sets, with Au associated with As. The microfracture-hosted sulfides have δ34S values between −2.2‰ and +4.6‰, consistent with a magmatic source. The vein-hosted sulfides associated with the high-Re molybdenite have a δ34S signature of 5.6‰ to 8.8‰, similar to values found in peridotite lenses in the Anatolian belt. The later enrichment in Re and δ34S-enriched S may be sourced from the surrounding ophiolitic country rock or may be the result of changing redox conditions during deposit formation.

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Published date: 1 November 2019

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Local EPrints ID: 435632
URI: http://eprints.soton.ac.uk/id/eprint/435632
ISSN: 0361-0128
PURE UUID: 49589748-4e36-416f-9b11-204b4b554e5e
ORCID for Stephen Roberts: ORCID iD orcid.org/0000-0003-4755-6703
ORCID for Damon Teagle: ORCID iD orcid.org/0000-0002-4416-8409

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Date deposited: 15 Nov 2019 17:30
Last modified: 18 Feb 2021 16:54

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