Genesis of self-organized zebra textures in burial dolomites: Displacive veins, induced stress, and dolomitization

E. Merino, Angels Canals, R. C. Fletcher

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)383-393
Number of pages11
JournalGeologica Acta
Volume4
Issue number3
StatePublished - Sep 1 2006

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dolomitization
dolomite
texture
dolostone
crystal
cement
void
rhythmite
pressure solution
self organization
transform fault
host rock
cavity

All Science Journal Classification (ASJC) codes

  • Geology

Cite this

Merino, E. ; Canals, Angels ; Fletcher, R. C. / Genesis of self-organized zebra textures in burial dolomites : Displacive veins, induced stress, and dolomitization. In: Geologica Acta. 2006 ; Vol. 4, No. 3. pp. 383-393.
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Genesis of self-organized zebra textures in burial dolomites : Displacive veins, induced stress, and dolomitization. / Merino, E.; Canals, Angels; Fletcher, R. C.

In: Geologica Acta, Vol. 4, No. 3, 01.09.2006, p. 383-393.

Research output: Contribution to journalArticle

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