How should igneous rocks be grouped?
Summary Despite their importance and frequency of usage, ‘grouping terms’ in petrology such as Association, Family, Lineage, Province, Series and Suite appear to lack established meanings. Partly by analogy with the recently standardized stratigraphic nomenclature, hierarchies of such terms are sugg...
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Cambridge University Press (CUP)
1981
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Online Access: | http://dx.doi.org/10.1017/s0016756800032817 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800032817 |
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crcambridgeupr:10.1017/s0016756800032817 2024-03-03T08:44:00+00:00 How should igneous rocks be grouped? Rock, N. M. S. 1981 http://dx.doi.org/10.1017/s0016756800032817 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800032817 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 118, issue 5, page 449-461 ISSN 0016-7568 1469-5081 Geology journal-article 1981 crcambridgeupr https://doi.org/10.1017/s0016756800032817 2024-02-08T08:44:28Z Summary Despite their importance and frequency of usage, ‘grouping terms’ in petrology such as Association, Family, Lineage, Province, Series and Suite appear to lack established meanings. Partly by analogy with the recently standardized stratigraphic nomenclature, hierarchies of such terms are suggested to cover petrographic classification (rock-names), petrological classification (rock-names extended to magma-types), geographic classification (igneous provinces) and tectono-genetic classification (rock assemblages characteristic of particular tectonic regimes). Used in this way, the exact implications of each term become clearer. Again by analogy with stratigraphy, ‘Super-’ and ‘Sub-’ groupings are suggested in a few cases: ‘Subprovince’ for example can differentiate distinct rock assemblages related to separate parent magmas within one well-defined Province (e.g. nephelinite-carbonatite and basalt-trachyte assemblages in the East African Rift), and ‘Superprovince’ can be used to group coeval Provinces now separated by opened oceans, etc. (e.g. Thulean Superprovince composed of Hebridean, East Greenland, etc., Provinces). The term ‘Province’ itself carries several ambiguities; it is best confined to cases where the ages of the spatially associated igneous rocks fall within a narrow range (e.g. Oslo Province); ‘Belt’ is suggested for those where the age-range is more substantial (e.g. Jurassic-Tertiary magmatism of Southeast Brazil). Article in Journal/Newspaper East Greenland Greenland Cambridge University Press Greenland Geological Magazine 118 5 449 461 |
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Cambridge University Press |
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English |
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Geology |
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Geology Rock, N. M. S. How should igneous rocks be grouped? |
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Geology |
description |
Summary Despite their importance and frequency of usage, ‘grouping terms’ in petrology such as Association, Family, Lineage, Province, Series and Suite appear to lack established meanings. Partly by analogy with the recently standardized stratigraphic nomenclature, hierarchies of such terms are suggested to cover petrographic classification (rock-names), petrological classification (rock-names extended to magma-types), geographic classification (igneous provinces) and tectono-genetic classification (rock assemblages characteristic of particular tectonic regimes). Used in this way, the exact implications of each term become clearer. Again by analogy with stratigraphy, ‘Super-’ and ‘Sub-’ groupings are suggested in a few cases: ‘Subprovince’ for example can differentiate distinct rock assemblages related to separate parent magmas within one well-defined Province (e.g. nephelinite-carbonatite and basalt-trachyte assemblages in the East African Rift), and ‘Superprovince’ can be used to group coeval Provinces now separated by opened oceans, etc. (e.g. Thulean Superprovince composed of Hebridean, East Greenland, etc., Provinces). The term ‘Province’ itself carries several ambiguities; it is best confined to cases where the ages of the spatially associated igneous rocks fall within a narrow range (e.g. Oslo Province); ‘Belt’ is suggested for those where the age-range is more substantial (e.g. Jurassic-Tertiary magmatism of Southeast Brazil). |
format |
Article in Journal/Newspaper |
author |
Rock, N. M. S. |
author_facet |
Rock, N. M. S. |
author_sort |
Rock, N. M. S. |
title |
How should igneous rocks be grouped? |
title_short |
How should igneous rocks be grouped? |
title_full |
How should igneous rocks be grouped? |
title_fullStr |
How should igneous rocks be grouped? |
title_full_unstemmed |
How should igneous rocks be grouped? |
title_sort |
how should igneous rocks be grouped? |
publisher |
Cambridge University Press (CUP) |
publishDate |
1981 |
url |
http://dx.doi.org/10.1017/s0016756800032817 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800032817 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_source |
Geological Magazine volume 118, issue 5, page 449-461 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0016756800032817 |
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Geological Magazine |
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118 |
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5 |
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449 |
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461 |
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1792499476343029760 |