Tab. 1 Analyses of major phases in Vestgötabreen formation schists
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1978
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| _version_ | 1867170909032284160 |
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| author | Manby, G M |
| author_facet | Manby, G M |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The glaucophane schists of Oscar II Land, it has been suggested, originated in a compressive plate boundary subduction zone environment. An alternative hypothesis is presented here linking the metamorphism of these schists with that of the surrounding pre-Carboniferous rocks. It has been estimated from mineralogical and textural relationships that at the time of metamorphism these rocks exceeded 30 km in thickness. Similarly, an ambient geothermal gradient of 15° C/km has been calculated for the now exposed succession. Pressures of sufficient magnitude would be realised near the base of this geosynclinal pile to produce eclogite from rocks of basic composition. Subsequent synmetamorphic penetrative deformation would give rise to glaucophane and greenschist facies assemblages. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_743267 |
| institution | PANGAEA |
| language | en |
| publishDate | 1978 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Tab. 1 Analyses of major phases in Vestgötabreen formation schists Manby, G M Aluminium oxide; Calcium oxide; Cambridge E.D.S. electron probe microanalyser; Elements, total; formation; Geological profile sampling; GEOPRO; Iron oxide, FeO; Magnesium oxide; Manganese oxide; Minerals; Oscar II Land, Svalbard; Potassium oxide; Silicon dioxide; Sodium oxide; Titanium dioxide; Vestgötabreen The glaucophane schists of Oscar II Land, it has been suggested, originated in a compressive plate boundary subduction zone environment. An alternative hypothesis is presented here linking the metamorphism of these schists with that of the surrounding pre-Carboniferous rocks. It has been estimated from mineralogical and textural relationships that at the time of metamorphism these rocks exceeded 30 km in thickness. Similarly, an ambient geothermal gradient of 15° C/km has been calculated for the now exposed succession. Pressures of sufficient magnitude would be realised near the base of this geosynclinal pile to produce eclogite from rocks of basic composition. Subsequent synmetamorphic penetrative deformation would give rise to glaucophane and greenschist facies assemblages. |
| title | Tab. 1 Analyses of major phases in Vestgötabreen formation schists |
| topic | Aluminium oxide; Calcium oxide; Cambridge E.D.S. electron probe microanalyser; Elements, total; formation; Geological profile sampling; GEOPRO; Iron oxide, FeO; Magnesium oxide; Manganese oxide; Minerals; Oscar II Land, Svalbard; Potassium oxide; Silicon dioxide; Sodium oxide; Titanium dioxide; Vestgötabreen |
| url | https://doi.org/10.1594/PANGAEA.743267 |