Surface weathering of rapakivi granite outcrops – implications for natural stone exploration and quality evaluation
Implications of surface weathering of rapakivi granite outcrops for natural stone evaluation were studied in the Wiborg rapakivi granite batholith in southeastern Finland. The study was performed as field mapping, comprising the whole batholith and as detailed investigations on selected outcrops. Th...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Estonian Academy Publishers
2008-09-01
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| Series: | Estonian Journal of Earth Sciences |
| Subjects: | |
| Online Access: | http://eap.ee/public/Estonian_Journal_of_Earth_Sciences/2008/issue_3/earth-2008-3-135-148.pdf |
| _version_ | 1818346064540860416 |
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| author | Härmä, Paavo Selonen, Olavi |
| author_facet | Härmä, Paavo Selonen, Olavi |
| author_sort | Härmä, Paavo |
| collection | DOAJ |
| description | Implications of surface weathering of rapakivi granite outcrops for natural stone evaluation were studied in the Wiborg rapakivi granite batholith in southeastern Finland. The study was performed as field mapping, comprising the whole batholith and as detailed investigations on selected outcrops. The Wiborg batholith is composed of wiborgite, pyterlite, even-grained rapakivi granite, porphyritic rapakivi granite, porphyry aplite, and gabbro-anorthosite. Wiborgite is the main rapakivi granite type. Weathering affects coarse-grained rapakivi varieties: wiborgite, pyterlite, and porphyritic rapakivi granite. Weathering occurs as surficial weathering of outcrops and randomly along subhorizontal and subvertical fractures, and varies in intensity. In the weathered upper parts of the outcrops the colour of the stone is altered and soundness of the stone diminished, which has a significant impact on the natural stone evaluation. In rapakivi granite areas, subsurface evaluation methods, by which the weathered surface part of the outcrops can be recognized, should always be used. Development of subsurface methods is required in order to make them more applicable in the evaluation of natural stone in areas with weathered rock. |
| first_indexed | 2024-12-13T17:12:20Z |
| format | Article |
| id | doaj.art-8cd658eb731b46159d8b2867d50d50ab |
| institution | Directory Open Access Journal |
| issn | 1736-4728 |
| language | English |
| last_indexed | 2024-12-13T17:12:20Z |
| publishDate | 2008-09-01 |
| publisher | Estonian Academy Publishers |
| record_format | Article |
| series | Estonian Journal of Earth Sciences |
| spelling | doaj.art-8cd658eb731b46159d8b2867d50d50ab2022-12-21T23:37:30ZengEstonian Academy PublishersEstonian Journal of Earth Sciences1736-47282008-09-01573135148Surface weathering of rapakivi granite outcrops – implications for natural stone exploration and quality evaluationHärmä, PaavoSelonen, OlaviImplications of surface weathering of rapakivi granite outcrops for natural stone evaluation were studied in the Wiborg rapakivi granite batholith in southeastern Finland. The study was performed as field mapping, comprising the whole batholith and as detailed investigations on selected outcrops. The Wiborg batholith is composed of wiborgite, pyterlite, even-grained rapakivi granite, porphyritic rapakivi granite, porphyry aplite, and gabbro-anorthosite. Wiborgite is the main rapakivi granite type. Weathering affects coarse-grained rapakivi varieties: wiborgite, pyterlite, and porphyritic rapakivi granite. Weathering occurs as surficial weathering of outcrops and randomly along subhorizontal and subvertical fractures, and varies in intensity. In the weathered upper parts of the outcrops the colour of the stone is altered and soundness of the stone diminished, which has a significant impact on the natural stone evaluation. In rapakivi granite areas, subsurface evaluation methods, by which the weathered surface part of the outcrops can be recognized, should always be used. Development of subsurface methods is required in order to make them more applicable in the evaluation of natural stone in areas with weathered rock.http://eap.ee/public/Estonian_Journal_of_Earth_Sciences/2008/issue_3/earth-2008-3-135-148.pdfnatural stonedimension stoneweatheringrapakivigraniteexplorationFinland |
| spellingShingle | Härmä, Paavo Selonen, Olavi Surface weathering of rapakivi granite outcrops – implications for natural stone exploration and quality evaluation Estonian Journal of Earth Sciences natural stone dimension stone weathering rapakivi granite exploration Finland |
| title | Surface weathering of rapakivi granite outcrops – implications for natural stone exploration and quality evaluation |
| title_full | Surface weathering of rapakivi granite outcrops – implications for natural stone exploration and quality evaluation |
| title_fullStr | Surface weathering of rapakivi granite outcrops – implications for natural stone exploration and quality evaluation |
| title_full_unstemmed | Surface weathering of rapakivi granite outcrops – implications for natural stone exploration and quality evaluation |
| title_short | Surface weathering of rapakivi granite outcrops – implications for natural stone exploration and quality evaluation |
| title_sort | surface weathering of rapakivi granite outcrops implications for natural stone exploration and quality evaluation |
| topic | natural stone dimension stone weathering rapakivi granite exploration Finland |
| url | http://eap.ee/public/Estonian_Journal_of_Earth_Sciences/2008/issue_3/earth-2008-3-135-148.pdf |
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