| Reference Type | Journal (article/letter/editorial) |
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| Title | Banded sphalerite from the North Pennine Orefield |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | More, A. P. | Author |
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| Vaughan, D. J. | Author |
| Ashworth, J. R. | Author |
| Year | 1991 (September) | Volume | 55 |
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| Issue | 380 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_55/55-380-409.pdf+ |
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| DOI | doi:10.1180/minmag.1991.055.380.10Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1744 | Long-form Identifier | mindat:1:5:1744:6 |
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| GUID | 0 |
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| Full Reference | More, A. P., Vaughan, D. J., Ashworth, J. R. (1991) Banded sphalerite from the North Pennine Orefield. Mineralogical Magazine, 55 (380) 409-416 doi:10.1180/minmag.1991.055.380.10 |
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| Plain Text | More, A. P., Vaughan, D. J., Ashworth, J. R. (1991) Banded sphalerite from the North Pennine Orefield. Mineralogical Magazine, 55 (380) 409-416 doi:10.1180/minmag.1991.055.380.10 |
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| In | (1991, September) Mineralogical Magazine Vol. 55 (380) Mineralogical Society |
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| Abstract/Notes | AbstractOptical microscopy of doubly polished thin sections of North Pennine sphalerite has revealed a range of previously unrecognised textures for the Alston Block mineralisation. Delicate growth zoning, interrupted by numerous solution disconformities, was seen in transmitted light. Two principal varieties of growth-banded sphalerite are recognised; the earlier (Type 1) is characterised by the development of thin opaque bands. Type 2 has colour bands between yellow and brown, correlated with iron content. In Type 1, iron levels (up to 3 wt.%) are not sufficient to account for the observed opacity. Ultra-violet and infra-red techniques failed to detect any organic inclusions. Electron microscopy revealed locally high concentrations of sub-micrometre inclusions, both beam-stable and beam-unstable, and a variety of growth-related crystal defects.Fluid inclusion thermometry in both sphalerite varieties and the accompanying quartz gangue implies a saline mineralising fluid (20–25 wt.% equiv. NaCl) at a relatively low temperature (100° to 140°C). Tubular inclusions are conspicuous. A deformation-induced lamelliform optical anisotropy is superimposed on a growth-related grid-iron anisotropy. Growth band offset is apparent where the deformation fabric cross-cuts the growth banding. Deformation on {111} twin and slip planes was indicated by electron microscopy. |
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