| Reference Type | Journal (article/letter/editorial) |
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| Title | Lead in diagenetic pyrite: evidence for Pb-tolerant bacteria in a red-bed Cu deposit, Quebec Appalachians, Canada |
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| Journal | Mineralogical Magazine |
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| Authors | Cabral, A. R. | Author |
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| Beaudoin, G. | Author |
| Munnik, F. | Author |
| Year | 2011 (April) | Volume | 75 |
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| Page(s) | 295-302 | Issue | 2 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2011.075.2.295Search in ResearchGate |
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| Mindat Ref. ID | 244148 | Long-form Identifier | mindat:1:5:244148:5 |
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| GUID | 3568b713-29ee-47a9-a0f3-9100f5f6d6da |
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| Full Reference | Cabral, A. R., Beaudoin, G., Munnik, F. (2011) Lead in diagenetic pyrite: evidence for Pb-tolerant bacteria in a red-bed Cu deposit, Quebec Appalachians, Canada. Mineralogical Magazine, 75 (2) 295-302 doi:10.1180/minmag.2011.075.2.295 |
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| Plain Text | Cabral, A. R., Beaudoin, G., Munnik, F. (2011) Lead in diagenetic pyrite: evidence for Pb-tolerant bacteria in a red-bed Cu deposit, Quebec Appalachians, Canada. Mineralogical Magazine, 75 (2) 295-302 doi:10.1180/minmag.2011.075.2.295 |
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| Abstract/Notes | AbstractDiagenetic pyrite from the Silurian continental red bed-hosted Transfiguration cupriferous deposit in the Quebec Appalachians, Gaspe Belt, Canada, contains up to ∼2% (m/m) Pb. This large Pb content in pyrite contrasts with experimental determinations that indicate solubility of <0.1% (m/m) PbS in pyrite at high temperature. The distribution of Pb in pyrite is heterogeneous, with plumbiferous domains occurring as patches and concentric growth layers alternating with Mn- and Mo-bearing zones. The plumbiferous pyrite is surrounded by As- and Cu-rich rims. This compositional heterogeneity, however, is elusive under normal backscattered-electron (BSE) imaging, but it can be recognized under high-gain BSE. Proton-induced X-ray emission (PIXE) confirms the presence of Pb. Plumbiferous pyrite with >0.1% (m/m) Pb has rarely been described; it is thus possible that plumbiferous pyrite may have been overlooked in metalliferous deposits worldwide. The plumbiferous pyrite from Transfiguration has a light S-isotope composition that is characteristic of bacterial sulphate reduction. We suggest that Pb in diagenetic pyrite indicates Pb-tolerant bacterial activity and, perhaps, constitutes a biosignature of bacterial tolerance to Pb in ancient sedimentary systems. |
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