Genesis of self-organized zebra textures in burial dolomites: Displacive veins, induced stress, and dolomitization
The dolomite veins making up rhythmites common in burial dolomites are not cement infillings of supposed cavities, as in the prevailing view, but are instead displacive veins, veins that pushed aside the host dolostone as they grew. Evidence that the veins are displacive includes a) small transform-...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB)
2006-01-01
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| Series: | Geologica Acta |
| Subjects: | |
| Online Access: | https://revistes.ub.edu/index.php/GEOACTA/article/view/1883 |
| _version_ | 1797654612597014528 |
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| author | E. MERINO À. CANALS I SABATÉ R. C. FLETCHER |
| author_facet | E. MERINO À. CANALS I SABATÉ R. C. FLETCHER |
| author_sort | E. MERINO |
| collection | DOAJ |
| description | The dolomite veins making up rhythmites common in burial dolomites are not cement infillings of supposed cavities, as in the prevailing view, but are instead displacive veins, veins that pushed aside the host dolostone as they grew. Evidence that the veins are displacive includes a) small transform-fault-like displacements that could not have taken place if the veins were passive cements, and b) stylolites in host rock that formed as the veins grew in order to compensate for the volume added by the veins. Each zebra vein consists of crystals that grow inward from both sides, and displaces its walls via the local induced stress generated by the crystal growth itself. The petrographic criterion used in recent literature to interpret zebra veins in dolomites as cements - namely, that euhedral crystals can grow only in a prior void - disregards evidence to the contrary. The idea that flat voids did form in dolostones is incompatible with the observed optical continuity between the saddle dolomite euhedra of a vein and the replacive dolomite crystals of the host. The induced stress is also the key to the self-organization of zebra veins: In a set of many incipient, randomly-spaced, parallel veins just starting to grow in a host dolostone, each vein’s induced stress prevents too-close neighbor veins from nucleating, or redissolves them by pressure-solution. The veins that survive this triage are those just outside their neighbors’s induced stress haloes, now forming a set of equidistant veins, as observed. |
| first_indexed | 2024-03-11T17:02:02Z |
| format | Article |
| id | doaj.art-33ee62cdee4048a8812005d2c7e8e2b9 |
| institution | Directory Open Access Journal |
| issn | 1696-5728 |
| language | English |
| last_indexed | 2024-03-11T17:02:02Z |
| publishDate | 2006-01-01 |
| publisher | Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB) |
| record_format | Article |
| series | Geologica Acta |
| spelling | doaj.art-33ee62cdee4048a8812005d2c7e8e2b92023-10-20T07:12:08ZengUniversitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB)Geologica Acta1696-57282006-01-014310.1344/105.000000352Genesis of self-organized zebra textures in burial dolomites: Displacive veins, induced stress, and dolomitizationE. MERINO0À. CANALS I SABATÉ1R. C. FLETCHER2Department of Geological Sciences, Indiana UniversityBloomington IN 47405, USA.Dpt. Cristal.lografia, Mineralogia i Dipòsits Minerals, Facultat de Geologia, Universitat de BarcelonaMartí i Franquès, s/n, 08028 Barcelona, Spain.Department of Geosciences, Pennsylvania State UniversityUniversity Park, PA 16802, USA.The dolomite veins making up rhythmites common in burial dolomites are not cement infillings of supposed cavities, as in the prevailing view, but are instead displacive veins, veins that pushed aside the host dolostone as they grew. Evidence that the veins are displacive includes a) small transform-fault-like displacements that could not have taken place if the veins were passive cements, and b) stylolites in host rock that formed as the veins grew in order to compensate for the volume added by the veins. Each zebra vein consists of crystals that grow inward from both sides, and displaces its walls via the local induced stress generated by the crystal growth itself. The petrographic criterion used in recent literature to interpret zebra veins in dolomites as cements - namely, that euhedral crystals can grow only in a prior void - disregards evidence to the contrary. The idea that flat voids did form in dolostones is incompatible with the observed optical continuity between the saddle dolomite euhedra of a vein and the replacive dolomite crystals of the host. The induced stress is also the key to the self-organization of zebra veins: In a set of many incipient, randomly-spaced, parallel veins just starting to grow in a host dolostone, each vein’s induced stress prevents too-close neighbor veins from nucleating, or redissolves them by pressure-solution. The veins that survive this triage are those just outside their neighbors’s induced stress haloes, now forming a set of equidistant veins, as observed.https://revistes.ub.edu/index.php/GEOACTA/article/view/1883RhythmiteZebra textureBreccia textureDisplacive veinsInduced stressSelf-organitzations |
| spellingShingle | E. MERINO À. CANALS I SABATÉ R. C. FLETCHER Genesis of self-organized zebra textures in burial dolomites: Displacive veins, induced stress, and dolomitization Geologica Acta Rhythmite Zebra texture Breccia texture Displacive veins Induced stress Self-organitzations |
| title | Genesis of self-organized zebra textures in burial dolomites: Displacive veins, induced stress, and dolomitization |
| title_full | Genesis of self-organized zebra textures in burial dolomites: Displacive veins, induced stress, and dolomitization |
| title_fullStr | Genesis of self-organized zebra textures in burial dolomites: Displacive veins, induced stress, and dolomitization |
| title_full_unstemmed | Genesis of self-organized zebra textures in burial dolomites: Displacive veins, induced stress, and dolomitization |
| title_short | Genesis of self-organized zebra textures in burial dolomites: Displacive veins, induced stress, and dolomitization |
| title_sort | genesis of self organized zebra textures in burial dolomites displacive veins induced stress and dolomitization |
| topic | Rhythmite Zebra texture Breccia texture Displacive veins Induced stress Self-organitzations |
| url | https://revistes.ub.edu/index.php/GEOACTA/article/view/1883 |
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