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| Format: | Artículo científico |
| Language: | en |
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Universitat de Barcelona
2006
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| Online Access: | https://www.redalyc.org/articulo.oa?id=50540305 |
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Table of Contents:
- Genesis of self-organized zebra textures in burial dolomites: displacive veins, induced stress, and dolomitization E. Merino A. Canals R.C. Fletcher Ciencias de la Tierra Self Rhythmite organization Zebra texture Induced stress The dolomite veins making up rhythmites common in burial dolomites are not cement infillings of supposedcavities, as in the prevailing view, but are instead displacive veins, veins that pushed aside the host dolostone asthey grew. Evidence that the veins are displacive includes a) small transform-fault-like displacements that couldnot have taken place if the veins were passive cements, and b) stylolites in host rock that formed as the veinsgrew in order to compensate for the volume added by the veins. Each zebra vein consists of crystals that growinward from both sides, and displaces its walls via the local induced stress generated by the crystal growthitself. 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 thatflat voids did form in dolostones is incompatible with the observed optical continuity between the saddledolomite euhedra of a vein and the replacive dolomite crystals of the host. The induced stress is also the key tothe self-organization of zebra veins: In a set of many incipient, randomly-spaced, parallel veins just starting togrow in a host dolostone, each veins induced stress prevents too-close neighbor veins from nucleating, or redissolvesthem by pressure-solution. The veins that survive this triage are those just outside their neighborssinduced stress haloes, now forming a set of equidistant veins, as observed. 2006 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50540305 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.3 Vol.4