Details
| Original language | English |
|---|---|
| Pages (from-to) | 417–434 |
| Number of pages | 18 |
| Journal | Mineralium deposita |
| Volume | 53 |
| Issue number | 3 |
| Early online date | 29 Jun 2017 |
| Publication status | Published - Mar 2018 |
Abstract
Different hypotheses exist on the origin of native copper mineralization in the Paraná volcanic province that invoke magmatic, late magmatic, or hydrothermal events. The average copper content in the host basalts is ~200 ppm. Native copper occurs as dendrites in cooling joints, fractures, and cavities within amygdaloidal crusts. Cuprite, tenorite, chrysocolla, malachite, and azurite occur in breccias at the top of the lava flows. Chemical analyses, X-ray diffraction, Raman spectrometry, electron microprobe analyses, LA-ICP-MS, and Cu isotope analyses were used to evaluate the origin of native copper in the volcanic province. Copper contents in magnetite of the host basalt are close to 1 wt.%, whereas clinopyroxene contains up to 0.04 wt.% Cu. Cretaceous hydrothermal alteration of magnetite and clinopyroxene released copper to generate hydrothermal copper mineralization. The isotopic composition of the native copper in the Paraná volcanic province varies from −0.9‰ in the southeastern portion (Rio Grande do Sul state) to 1.9‰ in the central portion (Paraná state) of the province. This study supports a hydrothermal origin followed by supergene enrichment for native copper in the Paraná volcanic province.
Keywords
- Copper isotopes, Hydrothermal mineralization, Native copper, Paraná volcanic province
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Economic Geology
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
- Earth and Planetary Sciences(all)
- Geophysics
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In: Mineralium deposita, Vol. 53, No. 3, 03.2018, p. 417–434.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Origin of native copper in the Paraná volcanic province, Brazil, integrating Cu stable isotopes in a multi-analytical approach
AU - Baggio, Sérgio
AU - Hartmann, Léo Afraneo
AU - Lazarov, Marina
AU - Massonne, Hans-Joachim
AU - Opitz, Joachim
AU - Theye, Thomas
AU - Viefhaus, Tillmann
N1 - Publisher Copyright: © 2017, Springer-Verlag GmbH Germany.
PY - 2018/3
Y1 - 2018/3
N2 - Different hypotheses exist on the origin of native copper mineralization in the Paraná volcanic province that invoke magmatic, late magmatic, or hydrothermal events. The average copper content in the host basalts is ~200 ppm. Native copper occurs as dendrites in cooling joints, fractures, and cavities within amygdaloidal crusts. Cuprite, tenorite, chrysocolla, malachite, and azurite occur in breccias at the top of the lava flows. Chemical analyses, X-ray diffraction, Raman spectrometry, electron microprobe analyses, LA-ICP-MS, and Cu isotope analyses were used to evaluate the origin of native copper in the volcanic province. Copper contents in magnetite of the host basalt are close to 1 wt.%, whereas clinopyroxene contains up to 0.04 wt.% Cu. Cretaceous hydrothermal alteration of magnetite and clinopyroxene released copper to generate hydrothermal copper mineralization. The isotopic composition of the native copper in the Paraná volcanic province varies from −0.9‰ in the southeastern portion (Rio Grande do Sul state) to 1.9‰ in the central portion (Paraná state) of the province. This study supports a hydrothermal origin followed by supergene enrichment for native copper in the Paraná volcanic province.
AB - Different hypotheses exist on the origin of native copper mineralization in the Paraná volcanic province that invoke magmatic, late magmatic, or hydrothermal events. The average copper content in the host basalts is ~200 ppm. Native copper occurs as dendrites in cooling joints, fractures, and cavities within amygdaloidal crusts. Cuprite, tenorite, chrysocolla, malachite, and azurite occur in breccias at the top of the lava flows. Chemical analyses, X-ray diffraction, Raman spectrometry, electron microprobe analyses, LA-ICP-MS, and Cu isotope analyses were used to evaluate the origin of native copper in the volcanic province. Copper contents in magnetite of the host basalt are close to 1 wt.%, whereas clinopyroxene contains up to 0.04 wt.% Cu. Cretaceous hydrothermal alteration of magnetite and clinopyroxene released copper to generate hydrothermal copper mineralization. The isotopic composition of the native copper in the Paraná volcanic province varies from −0.9‰ in the southeastern portion (Rio Grande do Sul state) to 1.9‰ in the central portion (Paraná state) of the province. This study supports a hydrothermal origin followed by supergene enrichment for native copper in the Paraná volcanic province.
KW - Copper isotopes
KW - Hydrothermal mineralization
KW - Native copper
KW - Paraná volcanic province
UR - http://www.scopus.com/inward/record.url?scp=85021728648&partnerID=8YFLogxK
U2 - 10.1007/s00126-017-0748-2
DO - 10.1007/s00126-017-0748-2
M3 - Article
VL - 53
SP - 417
EP - 434
JO - Mineralium deposita
JF - Mineralium deposita
SN - 0026-4598
IS - 3
ER -