| Reference Type | Journal (article/letter/editorial) |
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| Title | Acid sulphate alteration in a magmatic hydrothermal environment, Barton Peninsula, King George Island, Antarctica |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Armstrong, Debbie C. | Author |
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| Year | 1995 (September) | Volume | 59 |
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| Page(s) | 429-441 | Issue | 396 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_59/59-396-429.pdf+ |
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| DOI | doi:10.1180/minmag.1995.059.396.05Search in ResearchGate |
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| Mindat Ref. ID | 2663 | Long-form Identifier | mindat:1:5:2663:9 |
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| GUID | 5f0c92b5-a120-42c9-a212-72abf55db19f |
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| Full Reference | Armstrong, Debbie C. (1995) Acid sulphate alteration in a magmatic hydrothermal environment, Barton Peninsula, King George Island, Antarctica. Mineralogical Magazine, 59 (396) 429-441 doi:10.1180/minmag.1995.059.396.05 |
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| Plain Text | Armstrong, Debbie C. (1995) Acid sulphate alteration in a magmatic hydrothermal environment, Barton Peninsula, King George Island, Antarctica. Mineralogical Magazine, 59 (396) 429-441 doi:10.1180/minmag.1995.059.396.05 |
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| In | (1995, September) Mineralogical Magazine Vol. 59 (396) Mineralogical Society |
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| Abstract/Notes | AbstractVolcanic-hosted advanced argillic alteration on Barton Peninsula comprises an assemblage of chalcedonic silica, alunite family minerals, pyrophyllite, pyrite, native sulphur, zunyite and rutile, characteristic of an acid sulphate-type epithermal system. The minerals minamiite, (Na0.36Ca0.27K0.1â–¡0.27)Al3(SO4)2(OH)6, and zunyite, Al13Si5O20(OH,F)18Cl, are reported at this locality, and in Antarctica, for the first time. The WNW-striking, 1 km-long zone of alteration is hosted by early Tertiary andesitic rocks and contained in a 1.5 km-wide depression, rimmed by an arcuate ridge, probably representing a volcanic crater or small caldera structure.Stability relations of minerals in the advanced argillic alteration zone indicate alteration took place under acidic conditions in the near-surface environment. Mineralogical and textural evidence also suggest alteration occurred in a magmatic hydrothermal system, possibly with a magmatic steam component, rather than in a supergene or steam-heated environment. |
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